How Much Pension Do I Need?

Work out the pension pot size you need to fund your retirement income goal.

Your retirement plan

Desired annual retirement income

How much do you want to spend each year in retirement?

Retirement age

Life expectancy

That's 25 years of retirement to fund

Assumptions

Expected investment return

Annual return while invested (before inflation)

Inflation rate

Expected annual inflation rate

Real return (after inflation): 2.0%

You need

Pension pot required

£386,211

25% tax-free lump sum

£96,553

Remaining invested pot

£289,658

State Pension helps

From age 67, you'll receive approximately £11,502/year from the State Pension, reducing how much you need to draw from your private pension.

You'll need to fund 2 years yourself before State Pension starts.

Quick facts

• Total years in retirement: 25

• Real return assumed: 2.0%

• Your pot stays invested during drawdown

Understanding pension pot calculations

This calculator shows you the pension pot size you need at retirement to generate your desired income throughout your retirement years. It assumes your money stays invested, growing while you draw from it — known as pension drawdown.

How it works

1. Real returns matter: Your pot continues growing while you're retired. The calculator uses the "real return" (investment return minus inflation) to work out sustainable withdrawal amounts.

2. State Pension reduces the burden: From age 67, the State Pension provides £11,502/year (2025/26 rates), so your private pension doesn't need to cover your full income.

3. Tax-free lump sum: You can typically take 25% of your pension pot tax-free at retirement. The calculator shows this split.

Key assumptions

This calculator assumes:

• Your pension stays invested throughout retirement (drawdown, not annuity)

• Consistent annual returns (real markets vary year-to-year)

• Your pot depletes to zero at life expectancy (no inheritance goal)

• Fixed annual spending (no one-off expenses built in)

• You qualify for full State Pension

Realistic return expectations

Historical UK pension fund returns (after fees, before inflation):

• Conservative (bonds/cash-heavy): 3-4%

• Balanced (mix of stocks and bonds): 4-6%

• Growth (stocks-heavy): 6-8%

A 4.5% return with 2.5% inflation gives a real return of 2% — a cautious, sustainable assumption. Higher returns mean you can support the same income from a smaller pot, but come with higher risk.

What about annuities?

An annuity is an alternative to drawdown — you exchange your pension pot for a guaranteed income for life from an insurance company. Annuity rates vary with age, health, and interest rates. As a rough guide, a 65-year-old might get £5,000-6,000/year per £100,000 invested (2025 rates). This calculator models drawdown, not annuities.

Don't forget taxes

Income from your pension (after the 25% tax-free lump sum) is taxed as income. If you withdraw £30,000/year, you'll pay income tax on most of it. Factor this in when setting your income goal — you might need more gross income to achieve your desired net (after-tax) spending.

This is a simplified model. Real retirement planning involves taxes, one-off expenses, variable spending, market volatility, and changing goals. Use this as a rough guide, not a precise forecast. Consider speaking to a financial adviser for personalised advice.

This calculator uses present value calculations and assumes constant real returns. Actual investment returns vary year to year. State Pension amounts shown are 2025/26 rates and subject to change. Not financial advice.