Pension drawdown lets you take flexible income from your pension. Here’s how to calculate sustainable withdrawals.
For the wider cluster covering pension tax relief, lump sums, drawdown tax planning and annuity choices, use the main Pension Tax hub.
Drawdown Basics
How Drawdown Works
| Step | What Happens |
|---|
| 1 | Move pension to drawdown |
| 2 | Take 25% tax-free (optional) |
| 3 | Invest remaining 75% |
| 4 | Withdraw income as needed |
| 5 | Remainder stays invested |
Drawdown vs Annuity
| Feature | Drawdown | Annuity |
|---|
| Flexibility | High | Low |
| Guaranteed income | No | Yes |
| Investment risk | You bear it | Insurer bears it |
| Can run out | Yes | No |
| Death benefit | Pot to heirs | Usually stops |
| Income level | You choose | Fixed |
Sustainable Withdrawal Rates
Traditional Guidelines
| Withdrawal Rate | Historical Sustainability |
|---|
| 3% | Very conservative, likely to grow |
| 3.5% | Conservative, high success |
| 4% | Traditional “safe” rate |
| 4.5% | Moderate risk |
| 5% | Higher risk of running out |
| 6%+ | High risk, likely to deplete |
What Affects Sustainability
| Factor | Impact |
|---|
| Investment returns | Higher = longer |
| Inflation | Higher = shorter |
| Your lifespan | Longer = need lower rate |
| Starting age | Earlier = lower rate needed |
| Flexibility | Can you reduce if needed? |
How Long Will Your Pension Last?
£100,000 Pension Pot
| Withdrawal | 0% Return | 3% Return | 5% Return |
|---|
| £4,000/year (4%) | 25 years | 34 years | 50+ years |
| £5,000/year (5%) | 20 years | 25 years | 35 years |
| £6,000/year (6%) | 16.7 years | 20 years | 26 years |
£250,000 Pension Pot
| Withdrawal | 0% Return | 3% Return | 5% Return |
|---|
| £10,000/year (4%) | 25 years | 34 years | 50+ years |
| £12,500/year (5%) | 20 years | 25 years | 35 years |
| £15,000/year (6%) | 16.7 years | 20 years | 26 years |
£500,000 Pension Pot
| Withdrawal | 0% Return | 3% Return | 5% Return |
|---|
| £20,000/year (4%) | 25 years | 34 years | 50+ years |
| £25,000/year (5%) | 20 years | 25 years | 35 years |
| £30,000/year (6%) | 16.7 years | 20 years | 26 years |
£750,000 Pension Pot
| Withdrawal | 0% Return | 3% Return | 5% Return |
|---|
| £30,000/year (4%) | 25 years | 34 years | 50+ years |
| £37,500/year (5%) | 20 years | 25 years | 35 years |
| £45,000/year (6%) | 16.7 years | 20 years | 26 years |
Tax on Pension Drawdown
The 25% Tax-Free Amount
| Option | How It Works |
|---|
| Lump sum upfront | Take 25% tax-free immediately |
| Per withdrawal | 25% of each withdrawal is tax-free |
| Combination | Take some upfront, rest phased |
| Maximum tax-free | Currently £268,275 (25% of £1,073,100) |
Tax on the 75%
| Total Income | Tax Rate on Pension |
|---|
| Up to £12,570 | 0% |
| £12,571 - £50,270 | 20% |
| £50,271 - £125,140 | 40% |
| Over £125,140 | 45% |
Example: £30,000 Withdrawal
| Element | Amount | Tax |
|---|
| Tax-free (25%) | £7,500 | £0 |
| Taxable (75%) | £22,500 | See below |
| If Only Income | Tax Calculation |
|---|
| £22,500 taxable | |
| Personal Allowance | £12,570 @ 0% = £0 |
| Basic rate | £9,930 @ 20% = £1,986 |
| Total tax | £1,986 |
| Net from withdrawal | £28,014 |
Example: £30,000 + State Pension
| Income Source | Amount |
|---|
| State Pension | £12,548 |
| Pension drawdown | £30,000 |
| Tax-free portion | -£7,500 |
| Total taxable | £35,048 |
| Tax Calculation | Amount |
|---|
| Personal Allowance | £12,570 @ 0% = £0 |
| Basic rate | £22,478 @ 20% = £4,496 |
| Total tax | £4,496 |
Tax-Efficient Withdrawal Strategy
Phased Withdrawals
| Strategy | Benefit |
|---|
| Stay in basic rate | Avoid 40% tax |
| Use Personal Allowance | Tax-free income |
| Spread large withdrawals | Avoid higher brackets |
| Consider timing | ISA vs pension |
Optimal Withdrawal Order
| Order | Source | Reasoning |
|---|
| 1 | State Pension | Automatic, no choice |
| 2 | ISA income | Tax-free |
| 3 | Pension up to basic rate | 20% or less |
| 4 | Other income | As needed |
Annual Tax-Efficient Amount
| Other Income | Optimal Pension Withdrawal |
|---|
| £0 | ~£29,000 taxable stays basic rate |
| State Pension (£12,548) | ~£17,500 taxable stays basic |
| With 25% tax-free | Gross ~£23,000 for £17,250 taxable |
Calculating Your Drawdown
Step-by-Step Calculator
| Step | Your Numbers |
|---|
| 1. Pension pot value | £_______ |
| 2. Tax-free lump sum (25%) | £_______ |
| 3. Remaining pot | £_______ |
| 4. Desired annual income | £_______ |
| 5. Withdrawal rate (÷ step 3) | _______% |
| 6. Sustainable? (<4%) | Yes/No |
Example Calculation
| Step | Example |
|---|
| Pension pot | £400,000 |
| Tax-free lump sum (25%) | £100,000 |
| Remaining pot | £300,000 |
| Desired income | £15,000/year |
| Withdrawal rate | 5% |
| Sustainability | Medium risk |
Strategies by Age
Age 55-65 (Early Retirement)
| Consideration | Strategy |
|---|
| Long time horizon | Lower withdrawal rate |
| Before State Pension | Bridge with drawdown |
| Maximum tax-free use | Fill lower tax bands |
| Target rate | Below 4% may be considered (research is mixed) |
Age 65-75
| Consideration | Strategy |
|---|
| State Pension starts | Reduce drawdown need |
| Still long horizon | 3.5-4% |
| Review regularly | Adjust to pot performance |
Age 75+
| Consideration | Strategy |
|---|
| Shorter horizon | Can increase rate |
| Health consideration | Factor in life expectancy |
| Inheritance planning | Death benefits change |
| Possible rate | 4-5% if flexible |
Investment Strategy in Drawdown
Asset Allocation Approaches
| Approach | Allocation | Risk |
|---|
| Conservative | 30% equities, 70% bonds | Lower |
| Balanced | 50% equities, 50% bonds | Medium |
| Growth | 70% equities, 30% bonds | Higher |
Sequence of Returns Risk
| Risk | Meaning |
|---|
| Bad early years | Depletes pot faster |
| Good early years | Pot grows, more secure |
| Mitigation | Cash buffer for 1-2 years |
Cash Buffer Strategy
| Element | Purpose |
|---|
| Hold 1-2 years’ income in cash | Don’t sell in down markets |
| Replenish in good years | Sell when markets up |
| Reduces sequence risk | Smoother ride |
Pension Summary Tables
Withdrawal Amount by Pot Size (4%)
| Pot Size | Annual (4%) | Monthly |
|---|
| £100,000 | £4,000 | £333 |
| £200,000 | £8,000 | £667 |
| £300,000 | £12,000 | £1,000 |
| £400,000 | £16,000 | £1,333 |
| £500,000 | £20,000 | £1,667 |
| £750,000 | £30,000 | £2,500 |
| £1,000,000 | £40,000 | £3,333 |
Pot Needed for Target Income (4%)
| Target Income | Pot Needed |
|---|
| £10,000/year | £250,000 |
| £15,000/year | £375,000 |
| £20,000/year | £500,000 |
| £25,000/year | £625,000 |
| £30,000/year | £750,000 |
| £40,000/year | £1,000,000 |
Summary
| Key Principle | Guidance |
|---|
| Sustainable rate | 3-4% traditionally |
| Tax efficiency | Use 25% tax-free wisely |
| State Pension | Reduces drawdown need |
| Investment | Keep growing in retirement |
| Flexibility | Review and adjust |
| Professional advice | Recommended for large pots |
Sustainable Withdrawal Rates in Detail
What Is a Sustainable Withdrawal Rate?
A sustainable withdrawal rate (SWR) is the percentage of your starting portfolio you can take in year one of retirement, then increase with inflation each year, without running out of money over a 30-year retirement.
The 4% Rule in a UK Context
The original 4% rule was calibrated on US market data. The research on UK retirees is mixed: a historical study of 20 developed markets found a 4% starting withdrawal rate would have been too aggressive for retirees in many markets, including the UK, while a 2026 Morningstar model for UK retirees gave a highest safe starting rate of 4.1% over a 30-year horizon. The State Pension reduces the net amount the fund has to supply.
Worked Example: Sustainable Drawdown
Sarah, aged 67, retires with:
- SIPP: £350,000
- State Pension: £12,548/year (assumed to be payable immediately)
- Income target: £30,000/year
Drawdown need (first year): £30,000 – £12,548 = £17,452 from SIPP
SIPP withdrawal rate: £17,452 ÷ £350,000 = 5.0%: above the safe zone
Better approach: Draw down £18,498 from SIPP per year. As time passes and State Pension increases with triple lock, the drawdown need falls in real terms.
If Sarah delays her State Pension by a year: In year one she needs the full £30,000 from the SIPP, an 8.6% withdrawal rate. Risk of fund depletion. In year two, State Pension adds £12,548 and SIPP withdrawal falls to ~5%.
Sequence of Returns Risk
This is the biggest risk in early retirement. Consider:
Bad sequence: Portfolio falls 30% in years 1–2, then returns 10%/year for the next 28 years.
Good sequence: Portfolio grows 10%/year for years 1–2, then falls 30% in years 25–26.
Average return = same in both cases. But the bad sequence depletes the fund permanently because you are selling units at low prices to fund income. The good sequence leaves a large fund even after the late fall.
How to Reduce Sequence Risk
Bucket strategy:
| Bucket | Contents | Purpose |
|---|
| Bucket 1 (0–2 years income) | Cash | Pay income without selling equities in a crash |
| Bucket 2 (3–7 years income) | Bonds / income funds | Medium-term buffer |
| Bucket 3 (8+ years) | Equities (global tracker) | Long-term growth |
When cash in Bucket 1 is depleted, refill from Bucket 2. Refill Bucket 2 by rebalancing from Bucket 3 in good years. This means you never sell equities in a crash to pay income.
Practical Withdrawal Strategies
Fixed Percentage (Simple, Flexible)
Take X% of the current portfolio value each year. Income varies with portfolio value. The fund never technically runs out, but income can fall substantially in bad years.
Fixed Income (Simple, Risky)
Take the same £ amount each year, increasing with inflation. Income is predictable, but if returns are poor, the fund depletes. This is what the 4% rule describes.
Dynamic Withdrawal (Most Sophisticated)
- In years when the portfolio grows: take up to 5% of current value
- In years when the portfolio falls or stagnates: reduce to 3.5%
- The flexibility absorbs poor market years without draining the fund
When Drawdown May Run Out: Warning Signs
| Warning sign | Action |
|---|
| Annual withdrawal rate persistently above 6% | Reduce spending or add guaranteed income |
| Fund value falling continuously for 3+ years | Review portfolio and reduce withdrawals temporarily |
| Fund value below 10× annual drawdown need | Consider partial annuity purchase |
| Cognitive decline / difficulty managing investments | Move to simpler managed solution |
You Might Also Find Useful