UK Pension Drawdown Calculator

About UK Pension Drawdown Calculator

How Pension Drawdown Works

In flexi-access drawdown, your pension stays invested while you draw income from it, so the pot shrinks with each withdrawal and grows with investment returns. It became the dominant route since the 2015 pension freedoms, which abolished the need to buy an annuity with most pots. The FCA's Retirement Income Market Data 2024/25 (published October 2025) recorded 349,992 drawdown policies sold in the year - a 25.5% jump on 2023/24 and roughly four times the 88,430 annuity sales over the same period - while the total cash withdrawn from pensions hit £70.9 billion, up 36% year on year. The core formula each year is straightforward: closing balance = (opening balance - withdrawal) x (1 + growth). If "adjust for inflation" is enabled, the withdrawal itself rises by the inflation rate each year so real spending power is preserved.

Worked example: £400,000 pot, 4% starting withdrawal (£16,000/year), 5% growth, 2.5% inflation, inflation-adjusted:

• Year 1: (£400,000 - £16,000) x 1.05 = £403,200
• Year 2: withdrawal rises to £16,400, balance = (£403,200 - £16,400) x 1.05 = £406,140
• Year 10: balance ~£430,000 (returns still outpace withdrawals)
• Year 20: balance ~£400,000 (inflation catches up)
• Year 35-40: pot depletes as real withdrawals exceed real growth

At 4% with 5% nominal growth and 2.5% inflation (roughly a 2.5% real return), a £400,000 pot typically lasts 35-40 years. Push the nominal growth down to 4% or inflation up to 3.5% and the same withdrawal rate runs out around 22-25 years.

What Is a Safe Withdrawal Rate?

The "4% rule" from William Bengen's 1994 Journal of Financial Planning study is the most-cited benchmark, but Bengen himself revised it in A Richer Retirement (Wiley, 2025) to a 4.7% "SAFEMAX" for a worst-case 30-year horizon, citing a broader asset mix than his original 50/50 US stock-bond portfolio. Morningstar's 2025 "State of Retirement Income" report lands at 3.7-4.0% for new retirees given current valuations. For UK pots the picture is slightly tighter: domestic equities have thinner long-run real returns than the US, so most UK advisers quote 3.5-4% as a planning baseline for a 30-year retirement.

How long a £400,000 pot lasts at different starting rates (5% nominal growth, 2.5% inflation, inflation-adjusted withdrawals):

Withdrawal Rate	Annual Income (Year 1)	Pot Lasts
3%	£12,000	50+ years (effectively indefinite)
3.5%	£14,000	~45 years
4%	£16,000	~35 years
4.7% (Bengen 2025)	£18,800	~27 years
5%	£20,000	~24 years
6%	£24,000	~18 years
7%	£28,000	~15 years

Retiring before state pension age (age 67 for anyone born after April 1960) pushes the sustainable rate lower: someone drawing down from 55 to 67 carries the full load alone for 12 years, so 3-3.5% is a safer starting point.

The 25% Tax-Free Lump Sum (PCLS)

Up to 25% of any pension pot can be taken tax-free, subject to a lifetime cap of £268,275 under the Lump Sum Allowance (LSA) for 2026/27 (source: MoneyHelper). The remaining 75% stays in drawdown and is taxed as income when withdrawn. The LSA replaced the old Lifetime Allowance in April 2024; those with protected higher allowances from before that date keep them.

Worked example: £400,000 pot, take 25% (£100,000) as tax-free cash:

• Lump sum: £100,000 (tax-free)
• Remaining in drawdown: £300,000
• A 4% withdrawal from the remaining £300,000 = £12,000/year (vs £16,000 without the lump sum)

For pots above £1,073,100 the 25% multiplier still applies to the whole pot but is capped at the £268,275 figure. On a £1.5M pot, for example, the tax-free slice stays at £268,275, not £375,000. Using the lump sum to clear a mortgage can beat a 5-6% mortgage rate easily, but stripping it out early also removes the tax-deferred compounding on that money, so it rarely makes sense to take it and leave it in a low-interest current account.

Tax on Drawdown Income (2026/27 rates)

Drawdown income stacks on top of other earnings and is taxed at UK income tax rates. The personal allowance is frozen at £12,570 until April 2031 (Autumn Budget 2025 extension), so in 2026/27:

Taxable Income Band	Rate	On Drawdown
£0 - £12,570	0% (personal allowance)	No tax if total income stays under £12,570
£12,571 - £50,270	20% (basic rate)	Most retirees land here
£50,271 - £125,140	40% (higher rate)	Avoid dropping into this band unless needed
Above £125,140	45% (additional rate)	Personal allowance fully tapered by £125,140

From April 2026 the full new state pension is £241.30/week, or £12,547.60/year (gov.uk), which almost exactly uses up the personal allowance. That means every pound of drawdown on top is taxed at 20% (or 40% once total income passes £50,270). The common UK strategy: between retirement age and state pension age, take enough drawdown to use the £12,570 allowance fully each year, keeping later drawdown levels lower once the state pension starts. The same approach also protects ISA withdrawals, which arrive tax-free - see the ISA calculator for how a parallel tax-free pot can flatten your effective rate.

Drawdown vs Annuity - Which Wins in 2026?

Annuity rates have recovered sharply since 2022: a healthy 65-year-old can now secure roughly £7,200/year for life from a £100,000 pot at current gilt yields (Moneyfacts, April 2026), around 7.2% - the highest level in 15 years. That changes the arithmetic versus drawdown:

	Drawdown	Level Annuity (age 65)
Starting income on £100k	£4,000-£4,700 (4-4.7% rule)	~£7,200/yr (current rates)
Income longevity	Depends on markets and withdrawal rate	Guaranteed for life
Inflation protection	Can raise withdrawals as needed	Fixed (index-linked cuts starting income ~35%)
On death	Remaining pot inheritable (IHT rules changing April 2027)	Usually lost unless joint or guaranteed
Flexibility	Full control	Irreversible once bought
Best for	Larger pots, inheritance, flexibility	Essential-spend cover, peace of mind

Many retirees blend the two: buy an annuity covering essential costs (rent, bills, food) and leave the rest in drawdown for discretionary spending and inheritance. HMRC confirmed in the Autumn 2024 Budget that unused pension pots become liable for inheritance tax from 6 April 2027, which narrows a long-standing drawdown advantage - the inheritance tax calculator models how this affects estates above the £325K nil-rate band.

Sequence of Returns Risk

The single biggest risk in drawdown is poor market performance in the first 5-10 years - what pension researchers call "sequence risk". A 30% crash in year 1 while you withdraw 4% locks in a permanent 34% haircut; the same crash in year 20 barely dents longevity because the pot has already compounded. Historical UK data from the FTSE All-Share shows five separate periods since 1970 (1973-74, 2000-02, 2008-09, 2020, 2022) with drops big enough to wreck an early-retirement drawdown plan.

Three common mitigations:

• Cash buffer: hold 1-3 years of spending in cash or short-dated gilts inside the drawdown pot, so you can pause withdrawing from equities during a crash.
• Dynamic withdrawals: reduce withdrawals by 10-20% after a year with negative returns (Guyton-Klinger guardrails). Morningstar's 2024 research found this extended pot life by 5-10 years in the worst scenarios.
• Bond tent / rising equity glidepath: start retirement at 40-50% equities and gradually raise it to 60-70% over 10-15 years. Counter-intuitive, but Wade Pfau's Journal of Financial Planning research (2014) showed it cut worst-case shortfalls by around 30%.

UK Pension Pot Sizes - How Does Yours Compare?

Median UK pension wealth hides huge variation by age. The ONS Wealth and Assets Survey (most recent release, 2022-2024 wave, published March 2025) puts median private pension wealth for those approaching retirement at roughly £125,000 - well short of the £250,000-£400,000 most drawdown studies assume. Aviva's 2025 "Retirement Reality" report found 42% of UK over-50s underestimate how much they need, typically by £150,000 or more.

Age Band	Median Private Pension Wealth (UK)	Typical Drawdown Income at 4%
35-44	£22,700	£900/yr (on track with more contributions)
45-54	£51,300	£2,050/yr
55-64	£125,000	£5,000/yr
65+ (at retirement)	£107,000	£4,280/yr plus state pension

Added to the full new state pension of £12,547.60/year (2026/27), the median 65-year-old has around £16,800/year in retirement income - close to the Pensions and Lifetime Savings Association's "Minimum" living standard benchmark of £14,400/year for a single retiree but well below its "Moderate" benchmark of £31,300/year. The FCA's 2024/25 data also confirms how thin many drawdown pots are at the point of access: 40% of newly-accessed pension pots in 2024/25 were under £10,000, and the most common withdrawal rate from drawdown plans of any size was 8%+ - roughly double the 4% planning benchmark and a meaningful chunk of pots are unlikely to last a 20-year retirement at that pace.

Common Drawdown Mistakes

• Ignoring the MPAA trap: taking any taxable income from a pension triggers the Money Purchase Annual Allowance, cutting future pension contributions from £60,000 to £10,000 per year. Take the tax-free cash only and you keep the full £60,000 allowance.
• Emergency tax on first withdrawal: HMRC applies a month-1 emergency code to pension withdrawals, often over-taxing the first payment by thousands. Reclaim via P55 or wait for year-end reconciliation.
• Fixed nominal withdrawals: a "£20,000 per year" plan without inflation adjustment loses ~45% of purchasing power over 25 years at 2.5% inflation. Always plan in real terms.
• Picking a rate in isolation: drawdown pairs with the state pension, any DB pensions, and ISAs. Use the retirement calculator to size the total picture before settling on a pot-specific rate.

This tool is educational only. Pension decisions are complex and often irreversible - a regulated adviser (find one at unbiased.co.uk or vouchedfor.co.uk) is worth the fee for anything above a basic drawdown plan. All calculations run in your browser; nothing is sent anywhere.

Sources

• FCA - Retirement Income Market Data 2024/25 (October 2025)
• MoneyHelper - Lump Sum Allowances for Pensions (2026/27)
• GOV.UK - Benefit and Pension Rates 2026 to 2027
• House of Commons Library - Pensions Tax Briefing
• Morningstar - Reevaluating the 4% Withdrawal Rule (2025)
• Bankrate - Bengen's Revised 4.7% SAFEMAX Rule
• Moneyfacts - UK Annuity Rates