Pension Distribution Calculator
A pension fund is only useful once you know what it pays you: the same $500,000 can mean $25,000 a year that runs dry in 20 years, or a longer-lasting income if the untouched balance keeps growing. This Pension Distribution Calculator answers both questions side by side. Simple mode gives the flat division, a conservative floor; growth mode runs the balance year by year, shows the schedule, and tells you exactly how many years the money lasts; inflation-adjusted mode adds the Bengen/Trinity path, raising the withdrawal with inflation each year so spending power holds.
| Total distributed | |
| Remaining fund |
Planning estimates, not financial advice. Simple and growth modes pay a flat amount with no inflation adjustment; inflation-adjusted mode raises the withdrawal with inflation each year. No mode includes taxes; growth and inflation-adjusted modes assume a constant yearly return and, for inflation-adjusted mode, a constant inflation rate. Real markets vary: re-run with your actual balance each year.
Quick Answer
A $500,000 pension fund paying 5% a year gives $25,000 a year ($2,083.33 a month). In simple mode that pays out exactly $500,000 over 20 years with $0 left; in growth mode at 4% a year, the fund still holds $351,109.61 after 20 years and lasts 42 years in total. In inflation-adjusted mode at 3% inflation and 4% growth, the same $500,000 fund pays $25,000 in year 1, rising to $43,837.65 in year 20, pays $671,759.36 in total over 20 years, still holds $133,031.80, and lasts 24 years in total. Enter your own numbers above to see all three answers for your fund.
Key takeaways
- Simple mode is the conservative floor: it assumes the fund earns nothing while you draw it, so any real return only improves on it.
- Growth mode answers the question that matters: how many years the money actually lasts, computed year by year with the depletion year shown.
- A 4% return against a 5% withdrawal stretches a $500,000 fund from 20 years to 42: small gaps between return and withdrawal compound into decades. The 4% rule is an inflation-adjusted path, not a flat one: a first-year rate, then inflation rises. That is now a mode of its own, not a footnote.
- Simple and growth modes pay a flat annual amount with no inflation adjustment and no taxes. A fixed payout buys less each year, so treat those results as today's spending power. Inflation-adjusted mode fixes the spending-power gap by raising the withdrawal with inflation each year, at the cost of a shorter fund life: the worked fund lasts 24 years instead of 42.
- Quick Answer
- How to use the pension distribution calculator
- How pension distribution is calculated
- Worked example: $500,000 at 5% over 20 years
- Which mode answers your question
- What competing calculators miss
- What the model leaves out, and why it matters
- Frequently asked questions
- Add This Calculator to Your Website
- References
How to use the pension distribution calculator
Pick a mode, enter the fund and the withdrawal rate, then click Calculate distribution. The calculator shows the annual and monthly payout, the total paid out, what remains, and, in growth and inflation-adjusted modes, the year-by-year schedule and how long the fund lasts. Results stay hidden until you calculate.
- Choose simple, growth, or inflation-adjusted: Simple (no growth) divides the fund at a flat rate. With annual growth adds your expected return and simulates the balance year by year. Inflation-adjusted (Bengen/Trinity) pays the first-year amount, then raises it by your inflation rate each year while the balance grows. The growth field appears in growth and inflation-adjusted modes; the inflation field appears only in inflation-adjusted mode.
- Enter the fund, rate and years: the tool opens with the worked example, $500,000 at 5% over 20 years. Replace these with your own balance and planned withdrawal rate.
- Read the two headline numbers first: the annual payout in large type and, in growth and inflation-adjusted modes, the "Fund lasts" line. Then check the schedule to see the balance falling year by year.
- Stress-test the rate: raise the withdrawal rate a point at a time and watch the "Fund lasts" figure. The point where it drops below your planning horizon is the rate to avoid.
The currency selector changes the symbol only; it converts nothing. If your pension is a final-salary scheme that multiplies years of service by a factor rather than a fund balance, the pension multiplier calculator covers that structure; this page models drawdown from a pot.
How pension distribution is calculated
Simple mode is flat division. Growth mode applies the return to the opening balance each year, then subtracts the fixed withdrawal, repeating until the horizon ends or the fund depletes.
Annual payout = fund × withdrawal rate | Monthly = annual ÷ 12
Total paid = annual × years | Remaining = fund − total paid (floored at zero)
Growth mode (per year)
Balance grows: balance = balance × (1 + growth rate), then the annual payout is subtracted
If balance + growth is less than the payout, the fund pays what is left and stops
"Fund lasts" extends the same simulation past your entered horizon until the balance reaches zero
Inflation-adjusted mode (per year)
Withdrawal in year y = first-year payout × (1 + inflation rate)(y − 1)
Balance grows: balance = balance × (1 + growth rate), then that year’s withdrawal is subtracted
If balance + growth is less than the withdrawal, the fund pays what is left and stops
"Fund lasts" extends the same simulation past your entered horizon until the balance reaches zero
Two details of the growth model are worth knowing because they shape the answer. Growth is applied before the withdrawal each year, and the withdrawal is capped at whatever the balance plus that year's growth can pay, so the fund never goes negative: it simply stops in a specific year. The depletion check treats anything under half a cent as zero, and the "fund lasts" extrapolation looks up to 200 years past your horizon, which is far beyond any realistic plan. The same cap and depletion rules apply in inflation-adjusted mode, with the year’s rising withdrawal in place of the flat one. This is the Bengen/Trinity path: Bengen’s 1994 work and the 1998 Trinity study tested a first-year withdrawal raised with inflation each year. The tool’s annual figure in this mode is the year-1 payout; the schedule shows each later year’s larger withdrawal. The fixed inflation and return assumptions are still simplifications: real inflation and returns vary year to year.
Worked example: $500,000 at 5% over 20 years
The calculator opens with this example pre-filled. Run it in simple mode and you get $25,000 a year, $2,083.33 a month, $500,000 paid out and $0 remaining: the fund is divided exactly. Switch to growth mode at 4% and the same $25,000 a year leaves $351,109.61 after 20 years, with the fund lasting 42 years in total. Switch to inflation-adjusted mode at 3% inflation and 4% growth and the same fund pays $25,000 in year 1, $32,619.33 in year 10 and $43,837.65 in year 20, pays $671,759.36 over 20 years, still holds $133,031.80 after 20 years, and lasts 24 years in total. The rising withdrawal is why the fund ends sooner than in flat growth mode, even though both assume the same 4% return.
The schedule table in the results shows every year, not just the endpoints. Year 10, for instance, earns $17,883.44 of growth against the $25,000 withdrawal and ends at $439,969.46: the balance falls slowly at first, then faster as the growth base shrinks. That accelerating decline is the visual signature of a withdrawal rate above the return, and it is why the "fund lasts" line matters more than any single year's balance.
Which mode answers your question
Use simple mode when you want the worst case in one glance, growth mode when you want the realistic case with a timeline, and inflation-adjusted mode when you want to hold spending power. The three answer different questions.
| Question | Simple mode | Growth mode | Inflation-adjusted mode |
|---|---|---|---|
| What it assumes | The fund earns 0% while you draw it | The remaining balance earns your fixed yearly return | The first-year payout rises with inflation each year while the remaining balance earns your fixed yearly return |
| Answers | The payout and the guaranteed minimum outcome | The schedule, the remaining balance and how long the fund lasts | The inflation-adjusted schedule, the remaining balance and how long the fund lasts |
| $500k, 5%, 20 years | $500,000 paid, $0 left | $500,000 paid, $351,109.61 left, lasts 42 years | $671,759.36 paid, $133,031.80 left, lasts 24 years (at 3% inflation, 4% growth) |
| Use it when | You want a floor no market can take away | You want to plan around a realistic lifespan for the money | You want to hold spending power, not just dollars, and see what inflation costs |
One honest limitation used to apply to both flat modes: the withdrawal was flat, so neither was the 4% rule as researchers defined it. Bengen's 1994 work and the 1998 Trinity study tested a first-year withdrawal raised with inflation each year. Inflation-adjusted mode is that path, with fixed inflation and return assumptions in place of market history; the flat modes remain the simpler spending paths the Journal of Financial Planning's withdrawal-rate research would treat as a different spending path. For the time value behind a stream of payments, the present value of growing annuity calculator models payouts that rise each year.
What competing calculators miss
Pension and drawdown calculators split into two camps, and most live in only one:
- Simple dividers (many bank pension estimators): fund times rate, one number out. Fast, but they never warn you they assume zero growth, and they cannot say when the money runs out.
- Tax-bound drawdown tools (YieldMaple's RRIF calculator, UK drawdown calculators): deep on one country's rules, minimum withdrawal tables, withholding bands, tax-free lump sums. Excellent inside their jurisdiction; the mechanics are hard to reuse anywhere else, and the simple-mode floor is absent.
- Inflation-adjusted modellers (CommunityCalculator's withdrawal tool, CalculOnline's estimator): withdrawals that rise with prices, honest assumption-stripping in the worked examples. Strong on realism, but none pairs the flat-rate floor, the growth schedule and the inflation-adjusted path on one page with a readable year-by-year balance table.
- The gap this page fills: the conservative floor, the growth schedule and the inflation-adjusted path side by side, a balance table you can actually read, an explicit depletion year computed live (not a chart to squint at), and the model assumptions stated plainly instead of buried. For coordinating with state benefits, the Social Security retirement age calculator covers when to claim; military retirees can cross-check service payouts with the military retirement pay calculator.
What the model leaves out, and why it matters
A calculator this simple is honest only if its blind spots are labelled. Three stand out:
- No inflation adjustment in the flat modes. A $25,000 payout buys less in year 20 than in year 1. Use inflation-adjusted mode to model rising withdrawals, or read a flat-mode result as spending power in today's money. Inflation-adjusted mode itself assumes one fixed inflation rate every year; real inflation varies. The Social Security Administration's retirement planner is worth consulting alongside, since state benefits partially offset this.
- A constant return, every year (and a constant inflation rate in inflation-adjusted mode). Real portfolios do not earn 4% twelve months in a row; a bad early stretch, sequence-of-returns risk, can empty a fund that the average return says is safe. Re-run this calculation each year with the actual balance rather than trusting a 20-year projection made once.
- No taxes and no required minimums. Distributions from most tax-deferred accounts are taxable income, and the IRS requires minimum distributions from age 73 for many account types, which can force a higher withdrawal than you planned. The IRS publication index lists Publication 575, Pension and Annuity Income, as the reference for how these payments are reported.
Frequently asked questions
The 4% rule of thumb says you can withdraw 4% of your retirement fund in the first year, then adjust for inflation, and the money should last about 30 years. It comes from historical market simulations, not a guarantee, and this calculator's inflation-adjusted mode is that path: a first-year rate, then inflation rises each year. The flat modes are the simpler path.
It depends on the withdrawal rate and the growth of the remaining balance. Use growth or inflation-adjusted mode and read the "Fund lasts" line: it simulates year by year until the balance reaches zero. A $500,000 fund at 5% withdrawal and 4% growth lasts 42 years; at 3% inflation the same fund in inflation-adjusted mode lasts 24 years.
Simple mode assumes the fund earns nothing while you draw it, giving a conservative floor: fund times rate, divided over the years. Growth mode applies your expected yearly return to the remaining balance before each withdrawal, producing a year-by-year schedule and a depletion year. Inflation-adjusted mode does the same, but the withdrawal rises by your inflation rate each year from the first-year payout, following the Bengen/Trinity path.
For honest planning, yes: a fixed annual payout buys less each year as prices rise. Use inflation-adjusted mode, which raises the withdrawal by your inflation rate each year, instead of raising the withdrawal rate in growth mode to proxy inflation or treating a flat-mode result as spending power in today's money.
No. All three modes assume fixed rules and, in growth and inflation-adjusted modes, a constant return. Real markets vary and a bad early stretch can empty a fund the average return says is safe, which is why planners re-run this calculation every year with the actual balance.
The schedule shows it plainly: the end balance hits zero in a specific year, and the "Fund lasts" line names it. If that year is before you need the money to run out, lower the withdrawal rate or plan additional income.
Distributions from most tax-deferred pension accounts are taxable income, and required minimum distributions can force withdrawals from age 73 whether you need the money or not. This calculator shows pre-tax amounts; check the tax rules for your account type before planning spending.
Results stay hidden until you click Calculate distribution. That way the page loads clean and you always know the schedule matches the numbers currently in the boxes.
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References
- Social Security Administration. Plan for Retirement: how benefits are calculated from lifetime earnings and why the claiming age matters. Accessed October 24, 2026.
- Financial Planning Association, Journal of Financial Planning. Can We Predict the Sustainable Withdrawal Rate for New Retirees?: updates the Trinity-study withdrawal research, including the 4% rate's historical success across rolling 30-year periods. Accessed October 24, 2026.
- William P. Bengen. Determining Withdrawal Rates Using Historical Data (Journal of Financial Planning, 1994): the original 4% rule study, testing a first-year withdrawal raised with inflation each year. Accessed October 24, 2026.
- Philip L. Cooley, Carl M. Hubbard and Daniel T. Walz. Retirement Savings: Choosing a Withdrawal Rate That Is Sustainable (Trinity study, 1998): portfolio success rates for inflation-adjusted withdrawals across rolling periods. Accessed October 24, 2026.
- Consumer Financial Protection Bureau. Tools for Financial Security in Later Life: planning resources for retirement decisions, including pension payouts. Accessed October 24, 2026.
- Consumer Financial Protection Bureau. Adult Financial Education Tools and Resources: includes the pension lump-sum payouts guide for weighing monthly payments against lump sums. Accessed October 24, 2026.
- Internal Revenue Service. Forms, Instructions and Publications: lists Publication 575, Pension and Annuity Income, the IRS reference for reporting pension distributions. Accessed October 24, 2026.
- Broadridge / National Association of Government Defined Contribution Administrators. Q&A on Required Minimum Distributions: RMD ages, covered accounts, and how the minimum is computed from the prior year-end balance. Accessed October 24, 2026.