Pension Drawdown Calculator: Monthly Income From a Pot
Work out the monthly income a pension pot can provide when drawn down over a chosen number of years — the flexible drawdown approach in place of an annuity.
Adjust the inputs and select Calculate for a full breakdown.
Compare Common Scenarios
How the numbers shift across typical situations for this calculator:
| Scenario | Monthly income | Total drawn | Growth while drawing |
|---|---|---|---|
| $400k · 4% · 20yr | $2,423.92 | $581,741.12 | $181,741.12 |
| $250k · 3.5% · 25yr | $1,251.56 | $375,467.68 | $125,467.68 |
| $750k · 5% · 30yr | $4,026.16 | $1,449,418.38 | $699,418.38 |
| $150k · 4% · 15yr | $1,109.53 | $199,715.74 | $49,715.74 |
How This Calculator Works
Enter the pension pot, the return you expect the remaining balance to earn, and how many years the money must last. The calculator finds the fixed monthly drawdown that empties the pot at exactly the end of the period.
The Formula
Fixed-Period Drawdown
PV = savings pot, r = monthly rate (annual ÷ 12), n = number of monthly payments
Worked Example
A $400,000 pension pot earning 4% drawn down over 20 years supports about $2,424 a month. Over the period you withdraw roughly $581,700, with growth on the shrinking balance supplying the difference.
Key Insight
Drawdown keeps the pot invested while it pays out, which can produce more income than buying an annuity outright — but the trade-off is risk. A market drop early in retirement, when the pot is largest, lasts the longest.
Lump sum vs annuity — the structural choice
Pension at retirement typically offers choice: lump sum vs monthly annuity. Decision factors.
(1) LIFE EXPECTANCY — if you expect to live long, annuity wins (continues paying as long as alive). If shorter expected life, lump sum better (assets remain at death; annuity may stop).
(2) HEALTH — known health issues favor lump sum (annuity stops at death — only paid if you live to typical age). Healthy individuals favor annuity.
(3) MARKET CONFIDENCE — annuity provides guaranteed income; lump sum subjects you to market risk. Risk-averse retirees prefer annuity; investment-confident prefer lump sum.
(4) BENEFICIARY NEEDS — lump sum can be left to heirs; annuity (without survivor benefit) ends at death. Family considerations favor lump sum.
(5) PRESENT VALUE — discount the annuity payments at appropriate rate. Compare to lump sum. Generally close but lump sum tends to be slightly favorable mathematically when discount rate exceeds annuity's implied rate.
Cost of living adjustments (COLAs)
Public sector pensions typically include COLAs (cost of living adjustments) — annual payment increase tied to inflation. Federal pension (FERS): partial COLA. State/local pensions: vary (some full CPI, some capped).
Private sector pensions: typically NO COLA. Payment frozen at retirement age. Over 30-year retirement at 3% inflation: $50K initial pension has purchasing power equivalent to $20K at end of retirement.
Implication: private sector pension lump sum should be substantially larger than annuity-equivalent to compensate for missing COLA. Often the present value calculation favors lump sum heavily once inflation impact factored in.
Strategy for private sector pension: take lump sum; invest in diversified portfolio with stock allocation; withdraw at conservative SWR; let portfolio grow with inflation rather than receiving fixed pension payments. Mathematically dominant in most scenarios despite emotional appeal of 'guaranteed income.'
Pension drawdown scenarios from lump sum
Reference sustainable monthly drawdown from invested pension lump sum at various withdrawal rates.
| Lump sum | 4% SWR monthly | 5% SWR monthly | Annuity-equivalent (60 yr old) |
|---|---|---|---|
| $250K | $833 | $1,042 | ~$1,200-$1,500 |
| $500K | $1,667 | $2,083 | ~$2,400-$3,000 |
| $750K | $2,500 | $3,125 | ~$3,600-$4,500 |
| $1M | $3,333 | $4,167 | ~$4,800-$6,000 |
| $1.5M | $5,000 | $6,250 | ~$7,200-$9,000 |
Annuity-equivalent typically exceeds SWR-based withdrawal because annuity exhausts at death (no leftover for heirs) while SWR assumes principal preservation. The trade-off: annuity provides longevity insurance; SWR preserves capital for heirs but bears market risk.
Frequently Asked Questions
What is pension drawdown?
Drawdown means keeping a pension pot invested and withdrawing income from it as needed, rather than buying an annuity that pays a fixed amount for life.
Drawdown or annuity — which is better?
An annuity gives a guaranteed lifetime income; drawdown keeps flexibility and potential for growth but carries investment risk. Some people blend the two.
What return should I assume?
A retirement portfolio is usually conservative. A rate between cash and a balanced portfolio is common; a lower rate produces a more cautious estimate.
What is sequence-of-returns risk?
A bad market early in retirement hurts more than the same loss later, because withdrawals lock in the loss on a still-large pot. It is the main risk in drawdown.
Are pension withdrawals taxed?
Often partly. Rules vary by country and pension type; the figure here is pre-tax. The actual spendable income depends on local tax treatment.
When is this calculator unreliable?
When comparing lump sum vs annuity without considering survivor benefits, COLAs, and present value analysis. Also unreliable when not accounting for individual factors (life expectancy, health, family situation, market confidence). For pension decisions, consult with fiduciary fee-only advisor — the choice is irrevocable and depends on personal circumstances substantially.
References & Authoritative Sources
- Pension Benefit Guaranty Corporation (PBGC) — Pension Insurance Information · consulted June 1, 2026 · Federal pension insurance regulator
- U.S. Department of Labor — EBSA — Pension Plan Information · consulted June 1, 2026 · Federal employee benefits regulator
- Society of Actuaries (SOA) — Retirement Income Research · consulted June 1, 2026 · Industry actuarial research on pension and retirement income
Related Calculators
Data Sources & Benchmarks
This calculator draws on 2 independent, dated sources. The starting values for expected annual return are taken from the benchmarks below and refresh whenever the snapshots are updated.
Embed this calculator
Add this calculator to your website for your readers. The embed includes a neutral attribution link to the original CalcDomain page for methodology, updates, and source notes.
Attribution uses rel="nofollow" by default and is included for transparency, not ranking manipulation.
Suggest an improvement
Found a calculation issue, outdated source, unclear assumption, or missing edge case? Send a short note so we can review it.
Methodology & Review
Pension drawdown calculates sustainable monthly income from pension lump sum using safe withdrawal rate or annuitization framework. The calculator returns monthly income. For lump-sum pension: invest balance and withdraw at sustainable rate (typically 4-5% with longer horizons). For annuitized pension: receive guaranteed monthly payment regardless of market performance. RELIABILITY: Reliable for lump-sum SWR framework given assumptions. Less reliable as direct guidance because (a) lump-sum vs annuity choice involves complex tradeoffs; (b) actual SWR sustainable depends on returns; (c) pension survivor benefits, inflation adjustments, and cost-of-living adjustments vary substantially across pensions.
Reviewed according to the CalcDomain Editorial Policy & Calculator Methodology. We document formulas, edge cases, sources, update dates, and correction paths for calculator pages.
Updated