Tax-Free Lump Sum: Take It All at Once or Phase It?

The 25% Rule

When you access your defined contribution pension from age 55 (rising to 57 in 2028), you can take up to 25% of the pot tax-free. The remaining 75% is taxed as income when you withdraw it.

For many people, this is the single largest tax-free sum they'll ever receive. On a £400,000 pension, that's £100,000 — free of Income Tax, Capital Gains Tax, and National Insurance.

The question isn't whether to take it. For most people, accessing some tax-free cash makes sense. The question is when and how — because the approach you choose has significant implications for how long your money lasts and how much tax you pay over your retirement.

Option 1: Take It All Upfront

The most common approach. You crystallise your entire pension on day one, take the 25% tax-free lump sum, and move the remaining 75% into drawdown.

This is simple and gives you immediate access to a large sum of cash. People often use it to pay off a mortgage, clear debts, or fund home improvements. There's a certain peace of mind in having the money in your bank account rather than locked inside a pension.

But there are costs to this approach that aren't immediately obvious.

The reinvestment problem

Once you take the lump sum, that money leaves your pension wrapper. If you don't need it all immediately, where does it go? Typically into a bank account (earning little), or a stocks and shares ISA (good, but limited to £20,000 per year), or a general investment account (where future growth is subject to Capital Gains Tax and Dividend Tax).

Inside your pension, that money would have grown completely tax-free. By taking it out early, you've traded tax-free growth for taxable growth — or worse, for cash sitting in a savings account being eroded by inflation.

The flexibility cost

Once your pension is fully crystallised, you've locked in the 25% figure. If your pension grows after crystallisation, the growth doesn't qualify for additional tax-free cash. You've capped your entitlement at the value on the day you crystallised.

If you'd waited — or phased the process — your pension could have grown, and 25% of a larger pot is more tax-free cash overall.

Option 2: Phase It Over Time

Instead of crystallising everything at once, you can take your pension in stages. Each time you crystallise a portion, 25% of that portion is tax-free and 75% enters drawdown.

For example, with a £400,000 pension you might crystallise £80,000 per year over five years. Each year, £20,000 comes out tax-free and £60,000 enters your drawdown pot. By the end, you've taken £100,000 tax-free — the same total — but spread across five years.

Why phasing often wins

Tax efficiency on the drawdown portion. When you crystallise and start drawing income, the taxable 75% is added to your income for that year. If you crystallise everything at once and draw heavily, you risk pushing yourself into the 40% or even 45% tax band.

By phasing, you can control how much taxable income you take each year, keeping yourself within the basic rate band (currently £50,270). Over a retirement, this can save tens of thousands in Income Tax. You can model the difference for free with your own pension and tax position.

Continued tax-free growth. The uncrystallised portion of your pension continues to grow tax-free. You're not losing the pension wrapper's tax advantages on money you don't yet need.

Higher total tax-free cash. If your uncrystallised pension grows between phases, you get 25% of a larger amount. On a pension growing at 5% per year, crystallising in stages over five years rather than all at once could mean several thousand pounds more in tax-free cash.

Death benefits. Uncrystallised pension funds have more favourable inheritance treatment. If you die before 75, uncrystallised funds can be passed on completely tax-free to beneficiaries. Crystallised funds in drawdown can also be passed on tax-free before 75, but any money you've already withdrawn and moved to a bank account or GIA becomes part of your estate for Inheritance Tax purposes.

Note: From April 2027, inherited pension funds will be subject to Inheritance Tax as part of the deceased's estate, changing the treatment described above.

When Taking It All Makes Sense

Phasing isn't always the right answer. There are situations where taking the lump sum upfront is the better choice:

• Paying off a mortgage. If you're paying 4-5% interest on a mortgage, using tax-free cash to clear it can be a guaranteed return that's hard to beat. No more monthly payments also reduces your required income in retirement, which lowers your withdrawal rate.

• Clearing high-interest debt. Credit cards, loans, or other debts with interest rates above what your pension is likely to earn should generally be cleared first.

• You need the money now. If you're retiring and need the cash to bridge the gap before State Pension or other income starts, taking it is the practical choice.

• You're concerned about future rule changes. Tax rules can change. The 25% tax-free entitlement has been a feature of UK pensions for decades, but there's no guarantee it will remain at 25% forever. Some people prefer to lock in the benefit while it's available. The Lifetime Allowance was abolished in April 2024, but a new cap on tax-free cash was introduced at £268,275 — a reminder that the rules do evolve.

The Interaction With Other Income

The decision doesn't exist in isolation. Your total income picture in any given year determines how much tax you pay on pension withdrawals. Key factors include:

• State Pension. Once it starts, it uses up part of your Personal Allowance and basic rate band. If you're already receiving £11,973 from the State Pension, you have less room to take pension income at the basic rate before hitting 40%.

• Other employment or rental income. If you're semi-retired or have buy-to-let income, your available tax bands are already partially used.

• Your partner's tax position. If one partner has significantly more pension wealth, phasing withdrawals to balance taxable income across both people can reduce the household tax bill.

How to Think About It

The right approach depends on your specific numbers — your pension size, other income sources, spending needs, and timeline. But as a general framework:

1. Don't take the lump sum just because you can. The fact that it's available doesn't mean you need it now. Money growing tax-free inside a pension is valuable.

2. Calculate the tax cost. Work out what your marginal tax rate would be if you crystallised everything at once versus phasing over several years. The difference is often larger than people expect.

3. Consider what you'll do with the cash. If it's going into a savings account at 4% while your pension could earn 6-7% tax-free, you're paying for the privilege of having cash in hand.

4. Model it. The interaction between tax-free cash, taxable drawdown, State Pension, and other income is complex enough that rough calculations miss important details. Running your specific scenario through a simulation that accounts for tax at each stage gives you a clearer picture of the trade-offs.

There's no universal right answer — but for most people with moderate to large pensions, phasing the tax-free lump sum over several years is worth serious consideration. The upfront simplicity of taking it all at once often comes at a real, quantifiable cost. You can model both approaches for free and see the difference in your specific tax position.