Pension Drawdown & Income Sustainability Calculator

Pension Drawdown Guide

What's the key thing to understand about Safe Withdrawal Rates?

The 4% rule: research by William Bengen (1994) found 4% initial withdrawal, increased annually with inflation, lasted 30+ years in 95%+ of historical scenarios. Assumed 50/50 stocks/bonds. Modern UK perspective: more conservative — start at 3.5%. Bonds yields lower now than in Bengen's data. Markets have higher valuations. Adjustments: higher withdrawal (5%+): higher risk of running out before death. Lower withdrawal (3%): safer but lower lifestyle. Variable withdrawal: adjust each year based on portfolio performance, taking less in poor years and more in good years to reduce the risk of running out.

What's the key thing to understand about Sequence-of-Returns Risk?

When you retire matters as much as how much you save. Negative returns in early retirement years are devastating to portfolio longevity. Same long-term average return, different sequences: portfolio that gains then loses lasts decades longer than portfolio that loses then gains. Mitigation strategies: hold cash buffer 2-3 years before retirement. Reduce withdrawals in bear markets — skip inflation increases, or reduce by 10-20%. Don't sell during downturns — withdraw from cash/bonds instead. Annuitising a portion of the pot can provide a guaranteed income floor to cover essential expenses, reducing reliance on withdrawals from a potentially volatile drawdown portfolio.

What's the key thing to understand about Tax on Pension Drawdown?

25% tax-free lump sum: can take in one go OR spread across smaller chunks (UFPLS — Uncrystallised Funds Pension Lump Sum). 75% taxable as income: added to other income. Tax bands as normal. Personal Allowance: £12,570 — first slice tax-free. Combined State Pension and drawdown can push you into higher tax bands. Inheritance: pensions pass IHT-free until April 2027 (Autumn 2024 Budget proposes inclusion from then). Lifetime Allowance: abolished April 2024 — no longer a concern for most. But lump sum withdrawals above the 25% tax-free portion are taxed as income in the year they're taken, so large one-off withdrawals can push you into a higher tax bracket unexpectedly.

What's the key thing to understand about Avoiding Running Out?

Big risks to long retirement income: living longer than expected. Life expectancy: 65-year-old today has ~50% chance of reaching 87 (men) or 89 (women). Plan for 25-30 years of retirement. Inflation. Even 2% inflation halves purchasing power in 35 years. 5% inflation halves in 14 years. State Pension increases with triple lock but private pension income often doesn't. Care home costs. £40,000-80,000/year in later years. May exhaust portfolio rapidly. Some equity release options. Health needs. Inflation erodes fixed withdrawal amounts over a long retirement, so building in some allowance for rising costs each year is important when planning how long a pot needs to last.

Flexi-Access Drawdown vs. an Annuity — Flexibility Versus Guarantee

Flexi-access drawdown keeps your pension pot invested after retirement and lets you withdraw however much you like, whenever you like, which offers maximum flexibility and the chance for continued investment growth, but leaves you carrying both investment risk (the pot can fall as well as rise) and longevity risk (the responsibility of making sure the pot lasts as long as you do). An annuity instead exchanges some or all of your pot for a guaranteed income for life (or a fixed term), transferring both of those risks to the insurer in exchange for giving up the flexibility and any further growth potential on the amount annuitized. Many retirees choose a blend — securing essential income needs with an annuity while keeping a portion in drawdown for flexibility and growth potential — rather than committing entirely to one approach or the other.

Why Sequence of Returns Risk Is the Key Danger of Drawdown

Drawdown's biggest risk isn't the average long-term return of your investments — it's the sequence in which returns arrive, particularly in the early years of retirement. A pot that suffers a significant market fall in the first few years of withdrawals, while you're also drawing an income from it, can be permanently damaged in a way a pot that experiences the same fall decades later, with no withdrawals yet being made, would never be — because withdrawals during a downturn lock in losses on a shrinking base before any recovery has a chance to help. This "sequence of returns risk" is why many drawdown strategies recommend holding one to three years of planned withdrawals in cash or low-volatility assets, so a bad market year doesn't force selling invested assets at a low point purely to fund that year's income.

Mixing Drawdown and an Annuity

<p>Rather than choosing flexi-access drawdown or an annuity as an all-or-nothing decision, many retirees split their pension pot between the two, using an annuity to guarantee enough income to cover essential living costs and leaving the remainder in drawdown for flexibility and growth potential. This hybrid approach addresses the main weakness of each option on its own: a pure annuity locks away all your capital in exchange for certainty, leaving nothing for one-off costs or to pass on, while pure drawdown leaves essential bills exposed to investment performance and the risk of running out of money later in retirement. By annuitising only the portion needed to cover a baseline of guaranteed spending — often calculated alongside the State Pension as a floor of secured income — the remaining drawdown pot can be invested with a longer time horizon and more risk tolerance, since it isn't being relied on to pay the electricity bill every month. This blended strategy has become more common since pension freedoms removed the requirement to buy an annuity at all.</p>

Worked Example: Tax-Free Lump Sum Plus a Drawdown Income

A pension pot of £300,000 enters flexi-access drawdown. The saver typically can take up to 25% as a tax-free lump sum (subject to the current lifetime allowance rules for tax-free cash, which have changed in recent years and should be checked), so £75,000 tax-free, leaving £225,000 invested and drawn down over time. If they then draw £1,000/month (£12,000/year) from the remaining pot, that income is taxed as ordinary income alongside any other income (such as the State Pension) in the tax year it's withdrawn — it is not automatically tax-free just because it came from a pension. Using a commonly discussed safe withdrawal rate benchmark of around 3.5-4% of the remaining pot per year as a rough sustainability check, £225,000 × 4% = £9,000/year would be considered a cautious starting point by that rule of thumb, meaning the £12,000/year in this example is drawing somewhat faster than that guideline suggests, which increases the risk of running the pot down earlier, especially if investment returns are weak in the early years of drawdown (sequence of returns risk).

Withdrawal Rate vs Pot Longevity: A Sensitivity View

*Based on long-run historical studies (commonly referencing US and UK market data over many rolling periods) and should be treated as a rough planning guide, not a guarantee — future returns, inflation, and how long you live are all uncertain, and professional financial advice is strongly recommended before committing to a specific drawdown rate.