Net Savings Calculator
Savings & BankingWhat you really keep after fees, tax & inflation.
Your net savings plan
Advanced options
- Starting balance$10,000
- Contributions$90,000
- Net interest$32,502
Results are estimates for illustration only and assume constant rates, fees and tax. They are not financial, banking, investment, legal, accounting or tax advice. Your actual net savings depend on your bank's rates, fees and terms and your real tax situation.
Net goal progress
Your net balance doesn't reach the goal within this time period.
How your net savings grow
The gap between the gross and net lines is what fees and tax take.
Interest vs fees vs tax
How much interest you earn, set against the fees and tax that eat into it.
- Interest earned$44,438
- Fees paid$2,160
- Tax paid$9,776
Nominal vs today's money
Your net balance at 3% inflation, in future dollars and in today's purchasing power.
- Net balance$132,502
- In today's money$85,048
Compare scenarios
How your net balance shifts with different fees, tax and saving — all over the same time period.
- Your plan$132,502
- Save 50% more$191,695
- No banking fees$135,343
- Tax-free account$144,746
- +1% interest$142,292
Net savings schedule
| Year | Deposits | Interest | Fees | Tax | Gross | Net balance | Today's money |
|---|---|---|---|---|---|---|---|
| 0 | $0 | $0 | — | — | $10,000 | $10,000 | $10,000 |
| 1 | $6,000 | $582 | ($144) | ($128) | $16,585 | $16,310 | $15,835 |
| 2 | $6,000 | $872 | ($144) | ($192) | $23,472 | $22,846 | $21,534 |
| 3 | $6,000 | $1,172 | ($144) | ($258) | $30,676 | $29,616 | $27,102 |
| 4 | $6,000 | $1,483 | ($144) | ($326) | $38,210 | $36,628 | $32,544 |
| 5 | $6,000 | $1,805 | ($144) | ($397) | $46,091 | $43,892 | $37,862 |
| 6 | $6,000 | $2,139 | ($144) | ($471) | $54,333 | $51,416 | $43,060 |
| 7 | $6,000 | $2,484 | ($144) | ($547) | $62,955 | $59,210 | $48,143 |
| 8 | $6,000 | $2,842 | ($144) | ($625) | $71,972 | $67,283 | $53,114 |
| 9 | $6,000 | $3,213 | ($144) | ($707) | $81,404 | $75,645 | $57,976 |
| 10 | $6,000 | $3,597 | ($144) | ($791) | $91,269 | $84,307 | $62,733 |
| 11 | $6,000 | $3,995 | ($144) | ($879) | $101,587 | $93,280 | $67,387 |
| 12 | $6,000 | $4,408 | ($144) | ($970) | $112,379 | $102,574 | $71,943 |
| 13 | $6,000 | $4,835 | ($144) | ($1,064) | $123,667 | $112,201 | $76,403 |
| 14 | $6,000 | $5,277 | ($144) | ($1,161) | $135,474 | $122,173 | $80,770 |
| 15 | $6,000 | $5,735 | ($144) | ($1,262) | $147,823 | $132,502 | $85,048 |
How this is calculated
- Your 4.50% APR compounding 12× a year works out to a 4.594% effective annual yield.
- That becomes a 0.3750% monthly rate, applied to your balance over 180 months.
- With no fees or tax, the plan would grow to $147,823, earning $44,438 in interest.
- Banking fees take $2,160 and tax on interest takes $9,776 along the way.
- After those deductions your net balance is $132,502 — fees and tax cost $15,321 once lost growth is counted.
- Adjusted for 3% inflation, that net balance is worth $85,048 in today's money.
Know what this estimate is based on
- Jurisdiction
- General mathematical model
- Scope and limitations
- Projection only. Actual APY, posting dates, compounding, taxes, withdrawal rules, deposit protection, and fees depend on the financial institution and country.
- Source links checked
- Jul 30, 2026
Built and regression-tested by Smart Tools Lab. It has not been individually reviewed by a licensed financial, tax, or legal professional.
How to use
- 01
Start with the balance you already hold and the amount you set aside each period, choosing a monthly or yearly rhythm that matches your real habit.
- 02
Choose the rate the account earns: enter an APR together with a compounding frequency, or switch to APY for the effective yield a bank advertises — and set how long the money stays put.
- 03
Fill in the deductions that turn a gross projection into a net one: any monthly or annual banking fee, the tax rate on your interest, and an inflation rate to value the result in today's money.
- 04
Read the headline net balance against the gross figure to see what fees and tax actually cost you, then open advanced options for deposit timing, a one-time deposit, or a regular withdrawal.
- 05
Set a net savings goal, then let a solve-for mode run the plan in reverse and report the deposit, opening balance, rate, or number of years it takes to land on the goal once the drag is paid.
Formula
The calculator steps your account forward one month at a time and carries two balances side by side. The first is a gross balance that pays no fees and no tax; the second is the net balance, charged exactly as a real account would be. Both start from your opening balance, take the same contributions, one-time deposit and withdrawals, and earn interest at a monthly rate that, compounded twelve times, reproduces the effective annual rate exactly. On the net balance only, a monthly fee is taken every month or an annual fee on each completed-year boundary, and tax on the year's interest is deducted once a year. The gap between the two ending balances, gross minus net, is the cost of fees and tax — always larger than the raw fees plus tax, because those dollars also forfeit the growth they would have earned. The net balance is then divided by an inflation factor to show its value in today's money, and the single rate that would have grown the same plan, with no fees or tax, to the net balance is reported as the net effective yield.
Example
Picture $10,000 already in the account, topped up by $500 at the close of each month, earning 4.5% APR with monthly compounding — a 4.59% effective annual yield — across 15 years, alongside a $12 monthly banking fee, 22% tax on interest and 3% inflation. Strip out the fees and tax and the plan would reach a gross balance of about $147,822.88; charged the real way, the net balance lands at $132,501.83. You paid in $100,000 in total ($10,000 to open plus $90,000 of monthly top-ups) and the account credited $44,438.24 of interest. Of that, $2,160 went to fees and $9,776.41 to tax, leaving $32,501.83 of net interest. The gap between gross and net is $15,321.06 — noticeably more than the $11,936.41 of raw fees and tax, because the money skimmed off early never got to compound. After 3% inflation the net balance is worth about $85,047.88 in today's money, and the net effective yield works out to 3.34%, well below the 4.59% headline. Against a $150,000 net goal the plan reaches 88%, about $17,498 short, so a solve-for mode is the quick way to find the contribution or rate that would close the gap. Treat each figure as an estimate that holds only while the rate, fee and tax stay put across the full 15 years.
Definitions
- Net savings
- What you genuinely keep once banking fees and tax on interest, plus the compounding those deductions cost you, are taken out of the projection. The tool reports it as the net balance your account truly reaches, never the flattering gross figure quoted before a single deduction is applied.
- Gross balance
- Picture your plan in a frictionless world: zero banking fees, zero tax on interest, every dollar earning the account's full effective annual yield. That counterfactual is the gross balance, and it deliberately overstates the outcome — $147,822.88 in the worked example, well above what you actually bank.
- Net balance
- The headline this tool actually reports: where your account ends up once each monthly fee, annual fee and yearly tax charge has landed. It receives the same deposits and monthly rate as its gross twin yet carries all the deductions, settling at $132,501.83 in the example.
- Banking fee
- A first-class, per-period drag that bites the net balance alone. Charge it monthly and it recurs every single month; charge it annually and it strikes only once a full year completes. A $12 monthly fee across 15 years removes $2,160, each lost dollar surrendering its future compounding.
- Tax on interest
- Tax levied on the interest your account earns, assessed once each year plus a final pass in the closing month, then docked from the net balance only. A 22% rate costs the example $9,776.41, thinning the interest left to compound in the years that follow.
- Cost of deductions
- The distance between the gross and net balances — $15,321.06 in the example. It always runs larger than the $11,936.41 of raw fees plus tax, because every dollar skimmed early is robbed of the years of compounding it would otherwise have earned.
- Net interest
- Interest credited, minus the fees and tax that gnaw at it — the portion you finally keep. The example credits $44,438.24 of interest, yet only $32,501.83 lasts once $2,160 in fees and $9,776.41 in tax have been carved away.
- Net effective yield
- The lone rate that, stripped of all fees and tax, would still have carried your plan to the same net balance. Money-weighted and able to dip below zero, it trails the headline yield — 3.34% against the account's 4.59% here.
- Real (inflation-adjusted) net value
- Your net balance re-expressed in today's money after inflation erodes its buying power. Run 3% inflation against the example and that $132,501.83 net balance shrinks to $85,047.88 in present-day terms — what the savings will genuinely buy years on.
- Growth multiple
- How far the money you put in stretched into the net balance, found by dividing the net balance by everything you paid in. Set $132,501.83 kept against $100,000 contributed and the example lands a 1.33x multiple, fees and tax already counted.
- Net gain or loss
- The spread between your net balance and the money you fed in, which equals the net interest you kept. Here it comes to $32,501.83 — the $132,501.83 net balance minus $100,000 paid in — and it flips negative whenever fees and tax outrun the interest earned.
- Money in
- Every dollar you put up — the opening balance plus all the deposits that follow — net of anything you withdraw back out, tallied before interest, fees or tax. The example totals $100,000: a $10,000 starting balance plus $90,000 of $500 monthly additions over 15 years, with no withdrawals.
Good to know
Gross versus net: the number that actually matters
Most savings tools quote one ending figure and stop, which hides the very thing worth knowing. This calculator carries two balances forward side by side, because the gap between them is the whole point. Think of the gross balance as a clean counterfactual: it takes your deposits and credits interest at the same rate, yet never pays a fee and never owes tax, so it shows what the plan would reach in a frictionless world. The net balance is the realistic one, receiving the identical deposits and the identical monthly interest rate, then handing money to the bank in fees and to the tax authority on its interest, exactly as a real account does. We make the net figure the headline deliberately, because it is the only number that lands in your pocket; the gross figure exists to measure what the deductions cost you. At the default inputs the contrast turns concrete. Start with $10,000, add $500 at the end of every month, credit 4.5% APR compounded monthly, and hold for 15 years, and with no drag at all the gross balance reaches $147,822.88. Charge that same plan the way a real account is charged, with a $12 monthly fee and 22% tax on its interest, and it finishes at a net balance of $132,501.83. Reading those two numbers together shifts the question from how much will this grow to how much will I keep, which is what actually matters when you choose where to save. A glossy projection that quotes only the gross figure is telling you the optimistic half of the story. Both numbers here are estimates, built on the inputs you enter and a rate assumed to hold steady; the value of showing them together is the honest distance between them.
How banking fees quietly erode a balance: monthly versus annual
A banking fee feels trivial on any single statement, yet it is the most relentless deduction this tool models, because it is taken whether or not the account earned a cent that period. You can charge it two ways here, and the timing matters. A monthly fee comes out every single month, twelve times a year, from the net balance alone; at the default $12 that builds to $2,160 across the full 15-year horizon. An annual fee instead lands only when a complete year closes, a single charge on each completed-year boundary rather than a steady monthly trickle. Either way the deduction falls on the net balance only; the gross counterfactual never pays it, which is precisely how the two balances stay comparable. What makes a fee corrosive is not the size of any one charge but its persistence and its placement. Because it leaves before the next round of interest is figured, every dollar handed over is a dollar no longer present to earn. A monthly fee does this most steadily, trimming the balance twelve times a year so each following month's interest is computed on a slightly smaller base. The schedule makes the pattern plain: the fee line repeats period after period regardless of how the balance is doing, and in a lean stretch it can outpace the interest credited, so the net balance edges down even while deposits keep arriving. Choosing between a monthly and an annual fee is simply a matter of matching how your own account bills you. Whichever you select, remember the figures are estimates that assume the fee holds at the amount you enter for the entire term, while real banks revise their fee schedules whenever they choose, often quietly and often upward.
Why fees and tax cost more than they charge: lost compounding
Tally the fees and the tax in the default plan and you reach $11,936.41, made of $2,160 in fees plus $9,776.41 in tax on interest. Yet the gap between the gross and net balances, what this tool labels the cost of deductions, comes to $15,321.06. That difference is not a rounding slip; it is the single most important idea the calculator exists to surface. Every dollar skimmed in fees or paid in tax costs you more than that dollar, because you also forfeit the interest it would have earned across the rest of the horizon, and the interest on that interest, since the money was pulled out early and never rejoined the growth. The raw $11,936.41 is the sticker price of the deductions; the $15,321.06 is what they truly cost once the lost growth is counted. This is why the cost of deductions always sits above the fees and tax themselves, and why the spread widens the longer the money would have stayed and the higher the rate. Picture compounding running backward: the same force that turns steady deposits into a larger balance now magnifies every dollar removed by denying it the years of growth it would otherwise have joined. Seeing both figures reframes the choice in front of you. A fee or tax drag that looks like a fixed yearly nuisance is really a growing claim on your future balance, heaviest in exactly the accounts worth keeping money in longest. The practical lesson follows directly: trimming a recurring fee early is worth more than the fee alone, because you keep everything that dollar would have compounded into as well. Both numbers remain estimates tied to the rate and horizon you assume, but the relationship between them holds in every plan you build.
Tax on interest and after-tax growth
Interest earned in an ordinary savings account is usually taxable income, and this calculator folds that drag into the net balance. Once a year, and again in the final month so nothing slips through, it totals the interest the net account has credited, applies the rate you set, and removes the estimated tax. At the default 22% the plan owes $9,776.41 over its life, the largest single deduction in the example and well above the $2,160 of fees. Tax never touches the gross balance, which is what lets that figure stand as a no-drag benchmark; the net balance bears it in full. The detail that matters is timing: the bill comes out along the way, not settled neatly at the very end. Because each year's tax is taken before the next year begins, the interest that money would have grown is lost as well, so the after-tax interest that actually stays and compounds is what drives the result. In the default plan that comes to $32,501.83 of net interest kept, out of $44,438.24 credited gross. This is why a tax on interest behaves much like the fees, costing a touch more than the headline rate implies once the forgone growth is folded in. Enter the rate that fits the interest you earn, which turns on your wider tax position and need not match what you pay on wages. Should the account sit inside a tax-sheltered wrapper, or you simply want the pre-tax view first, set the rate to zero and the gross and net interest figures converge. One caution: the tool charges one flat rate and models none of the real brackets, thresholds or exemptions, so its tax line is a planning sketch rather than a calculation of what you will owe, and is no substitute for tax advice.
Inflation and the real value of what you keep
A net balance that looks healthy on a future statement will not buy what the same number buys today, because inflation steadily wears down what each dollar fetches. So alongside the nominal net balance, the tool reports a real value: that net figure restated in today's purchasing power. At the default 3% rate, the $132,501.83 net balance is worth roughly $85,047.88 in money you would recognise now. That is a wide gap, and it rewards a second look, because it is easy to fix on a six-figure ending number and forget that fifteen years of rising prices stand between you and spending it. Notice which figure the calculator chooses to deflate: it takes the real value of the net balance, the amount left after fees and tax have already been stripped out, not the gross counterfactual. Stacking the adjustments in that order keeps them honest, first finding what you actually keep, then asking what that kept amount will be worth. Deflating the gross figure would flatter the result twice over. Inflation never alters the nominal balance printed on your statement; it changes only what that balance commands at the till, which is why the real value sits below the nominal one without rewriting it. When your goal is framed in today's prices, a future purchase whose own cost will climb, the real value is the figure to weigh it against, since the two are denominated the same way. Of every input, the inflation rate is the most genuinely unknowable, because no one can forecast prices over a decade and a half. The tool holds the single rate you enter steady for the whole term, smoothing a number that wanders year to year, so treat $85,047.88 as a rough indication of purchasing power rather than a precise prediction.
Net effective yield: the return after the drag
Two rates describe this plan, and the distance between them is one of the tool's most telling outputs. The headline effective annual yield is what the account advertises, 4.59% at the default 4.5% APR compounded monthly, and it governs the gross balance, the world with no fees and no tax. The net effective yield answers a sharper question: what single rate, applied with no fees and no tax, would have grown your exact deposits to the net balance you actually end with? In the default plan that solves to 3.34%, well below the 4.59% headline. The drop from 4.59% to 3.34% is the fees and the tax expressed as one comparable number, the real return your money earned after every deduction rather than the rate printed on the account. It is money-weighted, solved from the actual schedule of deposits and the final net balance, so it reflects when money went in as well as how much. That also means it can fall a long way; in a high-fee, low-rate account it can even turn negative, telling you the deductions outran the interest and the account quietly shrank. The net effective yield earns its keep precisely because it collapses several moving parts into one rate you can hold against another account's headline. An account boasting a higher advertised yield but heavier fees might deliver a lower net effective yield than a plainer rival, and this single number settles that comparison for you. Like every figure here it is an estimate, resting on the rate, fee and tax you entered holding steady for the full horizon; a real account whose rate drifts or whose fees change would hand you a different net effective yield than the one shown.
A net savings goal, and five ways to solve for it
A goal figure turns this from a projection into a plan, and the important twist is that the target is measured against the net balance, what you keep after fees and tax, not the rosier gross figure. Enter a goal and the tool reports how far the net plan reaches: at the default $150,000 target it gets to 88%, leaving the plan about $17,498 short, with a growth multiple of 1.33x on everything you put in. Falling short against a net goal is far more honest than clearing a gross one you would never actually hold. From there the calculator can run the plan backward through five solve-for modes, each one aimed at the net target rather than the pre-deduction number. The first simply projects the net balance from your inputs. The second finds the required monthly contribution, the deposit that lands on the goal after the fees and tax bite. The third works out the required starting balance, the up-front sum needed today so the net plan finishes on target. The fourth pins down the required interest rate, the yield the account must pay to overcome its own drag and reach the goal. The fifth gauges the required duration, how long you must keep saving for the net balance to cross the line. Because every mode answers from the net side, the figures it returns already absorb the cost of the fees and the tax: the contribution it asks for is the one that wins after the bank and the tax authority have taken their share, not before. Not every goal is reachable under every constraint, and the tool flags that rather than printing a number that misleads. Read a workable answer as an estimate of what the plan would demand, since your rate and your capacity to save can both move.
Withdrawals, one-time deposits and an uneven real plan
Few people save in a perfectly straight line, so the tool lets you drop in a one-time deposit and take regular withdrawals on top of the steady contributions. What is worth understanding is how these events travel through the two-balance model. A one-time deposit and every scheduled withdrawal hit the gross and the net balance identically, the same dollar arriving in, or leaving, both accounts on the same month, because they are your transactions rather than deductions the tool imposes. The cushion each balance carries is what differs. Having paid fees and tax along the way, the net balance is already the thinner of the two, so a run of withdrawals presses on it harder and can run it down faster than the gross counterfactual suggests. That gap between an optimistic gross drawdown and the realistic net one is exactly the sort of thing a single ending number would bury. Withdrawals are also capped so the balance can reach zero but never drop below it: if the net account lacks the funds for a scheduled withdrawal, only the balance that remains is taken, and the total-withdrawals figure reflects what came out rather than what you asked for. A net balance pinned near zero, or a withdrawal total smaller than your schedule implies, is the tool signalling that the plan emptied the account before the horizon ended. Combining these features lets you stress-test an uneven plan: whether steady deposits plus a future windfall still reach the net goal, or whether a regular drawdown drains the account once fees and tax are pulling on it too. As ever the result is an estimate that assumes each deposit, withdrawal and one-time amount lands exactly on the month you scheduled, while real life rarely keeps so neatly to the calendar.
Reading the gross-versus-net chart and the schedule
The chart and the schedule are where the gross-versus-net story stops being abstract. The chart plots both balances against time as two curves that start together and pull apart, and the widening space between them is the cost of deductions taking shape month by month. Early on the lines sit almost on top of each other, because little has been skimmed yet; as the years pass the space stretches, since each fee and each tax bill not only leaves the net balance but forfeits the growth it would have added, so the distance compounds rather than holding steady. By the final month that visible gap is the $15,321.06 cost of deductions, and the chart's main job is to make that number feel like the accumulation it is rather than a one-off charge. Where the curves only imply the detail, the schedule fills it in. Row by row it lays out the deposits going in, the interest credited to each balance, the fee taken from the net side, the tax deducted on the yearly boundaries, and the two running balances side by side. Reading down it you watch the mechanics directly: the fee line repeating, the once-a-year tax line appearing, and the net balance always trailing the gross one by a margin that grows. It is also where you catch a plan in trouble, since a stretch where the fee outruns the interest, or a withdrawal that drains the balance toward zero, shows up as a specific row you can point to. The chart gives you the shape and the schedule gives you the evidence, so a headline like a net balance of $132,501.83 against a gross $147,822.88 becomes something you can trace rather than take on trust. Both views render the same estimate, built on inputs assumed to hold for the full term.
Realistic inputs, what the model leaves out, and reading results as estimates
Treat every output here as an estimate shaped by the numbers you feed it, never a promise about a particular account, and not financial, banking, investment, tax, legal or accounting advice. Good inputs come first: pull the fee and the rate from a recent statement rather than guessing, set the rate to the figure your bank actually quotes, enter the tax rate that genuinely applies to your interest, and pick a contribution you can sustain through lean months. Be honest about the deductions, since understating a fee or a tax rate flatters the net balance most of all. Then know what the model simplifies, much of it specific to how this tool works. It runs two idealised balances on one clean monthly step, so the gross and net figures are faithful but smoother than how a real bank posts interest and levies charges. It assesses tax once a year and again in the closing month using one flat rate, ignoring the brackets, thresholds and exemptions a real return would apply, so the tax line is a planning sketch rather than a filing. It holds the fee, the rate, the tax rate and the inflation rate steady for the whole horizon, while real banks revise fees, run rates that expire, and adjust variable yields whenever they choose. The net effective yield is a rate back-solved from the plan, a convenient summary of the drag rather than something any account will quote you. And it cannot reflect every charge a bank may impose or the rules of a tax-advantaged wrapper. None of that makes the figures useless; it makes them a way to compare scenarios and gauge scale, not a contract. Before you commit real money, confirm the current fees, rate and terms directly with the bank, and speak to a qualified professional who can weigh your full circumstances first.
Frequently asked questions
How is this different from a plain savings calculator?
Most savings calculators stop at the gross balance — what your deposits and interest add up to before anything leaves the account. This one keeps going, charging your money like a real bank: it subtracts banking fees and tax on interest to reach a net balance, then restates that figure in today's money for inflation. In the default example a gross balance of $147,822.88 lands as a net balance of $132,501.83, worth about $85,047.88 in real terms after 3% inflation. The headline number here is net — what you can actually spend, not the fee-free, tax-free version.
What does "net" actually include?
Net means your balance after the real-world drags come out. Starting from gross, the calculator strips away every banking fee — each monthly charge plus any annual one — and the tax assessed on the interest you earn, then can restate the result in today's money. In the worked example $2,160 of fees and $9,776.41 of tax are removed, leaving net interest kept of $32,501.83 on top of your $100,000 paid in, for a net balance of $132,501.83. The gross figure never has fees or tax applied, so it stands purely as a what-if; net is the amount you carry away.
Why is the cost of fees more than the fees themselves?
Every dollar skimmed off early forfeits the years of growth it would otherwise have earned. Add up the raw fees and tax in the example and you get $11,936.41 — yet the gap between the $147,822.88 gross balance and the $132,501.83 net balance, called the cost of deductions, comes to $15,321.06. That difference is the compounding those removed dollars never got to produce. A $12 fee pulled in year one isn't really $12; it's $12 plus fifteen years of interest it can no longer earn, which is why deductions always cost more than their sticker price.
How do monthly and annual fees differ?
A monthly fee hits every single month, so it bites twelve times a year and starts dragging on your balance from the very first one. An annual fee lands only when a full year completes — once per twelve-month boundary. In the example the $12 monthly fee runs the whole fifteen years and totals $2,160 paid. Charged more often and earlier, a monthly fee usually costs you more than the same money billed annually, because each early deduction also gives up its future compounding. Where a fee falls in time, not just its size, shapes the damage it does.
What does the net effective yield mean?
Picture the single steady rate that, with no fees and no tax, would have grown your exact plan to the same net balance — that's the net effective yield. It's money-weighted, so the timing of your deposits counts, and it can even turn negative when charges swamp your interest. The account's headline effective annual yield in the example is 4.59%, while the net effective yield comes in at just 3.34%. The gap between those two rates is what fees and tax cost you, expressed as a rate instead of a dollar figure — the same story the cost of deductions tells in money.
How is the tax on interest applied?
Tax falls only on the interest you earn, never on the deposits you make, and it's assessed once a year plus a final reckoning in the last month. The calculator follows the interest credited to your net balance, applies your rate to it, and lifts that tax out — leaving your principal untouched. In the example, 22% on $44,438.24 of interest comes to $9,776.41 across the fifteen years. Each yearly tax bite also surrenders its own future compounding, just as fees do, which is why it sits inside the larger $15,321.06 cost of deductions rather than only the raw total.
What does "gross, before deductions" mean?
Gross is the clean what-if: the balance your plan would reach with zero fees and zero tax, driven purely by deposits and interest. The calculator runs it side by side with the net balance — same starting amount, same deposits, same monthly interest rate — and the only difference is that fees and tax never touch the gross side. Here gross reaches $147,822.88 against a net balance of $132,501.83. You don't keep the gross figure; it's the yardstick that makes the $15,321.06 cost of deductions visible, showing at a glance exactly what the charges quietly removed.
Can fees ever outrun the interest you earn?
They can. When fees and tax loom large against a small balance or a thin rate, the deductions can top the interest earned and your net balance shrinks instead of grows. That's the case the net effective yield captures when it drops below the headline rate and, in a fee-heavy plan, below zero. The default example runs the other way: interest of $44,438.24 easily clears the $11,936.41 of fees and tax, so net interest kept stays a healthy $32,501.83. On a thinner balance, though, a steady monthly fee can quietly swallow everything the account earns.
How do the five solve-for modes work?
Each of the five modes targets your net goal, never the gross figure. You can project the net balance straight from your inputs, or lock in that net target and have the calculator back out the one piece left open — your monthly deposit, your opening balance, the rate, or how many years it runs. In the example the $150,000 net goal sits 88% covered by a net balance of $132,501.83, about $17,498 short — so a solve-for mode would raise your deposit, opening balance, rate or duration until the net result clears $150,000 after fees and tax have been taken.
Can the balance go negative?
It can't. Withdrawals are capped so the balance can fall all the way to zero but never beneath it — ask for more than is left and only what's there comes out. That keeps the projection honest, since a real savings account won't hand you money it doesn't hold. The catch is that an over-ambitious withdrawal plan simply empties the account early rather than printing an impossible negative figure. So if you're drawing down rather than only paying in, watch for a balance that reaches zero before your time horizon ends instead of a number below the line.
How does inflation change the real value?
Inflation leaves your account balance alone and changes only what it can buy. To show that, the calculator deflates your net figure into today's money: the $132,501.83 net balance is worth about $85,047.88 in current dollars after 3% inflation over fifteen years. The nominal net number still climbs, but its real value lands far lower, because prices keep rising while the money sits. Pairing the two is the point — the real net value tells you what the plan buys, not just how large it looks, and that purchasing-power figure is the one your future self actually spends.
What does the growth multiple mean?
Your growth multiple shows how many times the money you put in turns into net money out. It sets your net balance against everything paid in — the starting balance plus every contribution. In the example you pay in $100,000 ($10,000 to open and $90,000 of monthly $500 deposits) and finish with a net balance of $132,501.83, a multiple of 1.33x. Because it's built on the net figure, it already carries the weight of fees and tax, making it a franker measure of what your saving really returned than any gross-based multiple would give you.
Is this financial or tax advice?
No — and that line matters. Every number here is an estimate the tool builds from what you enter, not a quote or a promise, and none of it is financial, investment, banking, tax, legal or accounting advice. Real accounts differ: rates move, fee schedules vary, interest may compound on other schedules, and tax treatment hangs on your jurisdiction and circumstances. The worked example — a $132,501.83 net balance from $100,000 paid in — shows how the mechanics fit together, not what any bank will pay. Use it to compare scenarios and sharpen your questions, then confirm the specifics with your bank and a qualified professional.