This page works the "one more year" question as plain arithmetic: what an extra working year adds to a sustainable retirement income, where the gain comes from, and what sits on the other side of the ledger. It exists because both famous answers, "retire as soon as possible" and "just one more year", are the same calculation wearing opposite framings.
One popular argument says retire as early as the numbers allow, because time is the asset that cannot be bought back. Another says one more year of work transforms the finances. Both are right about their half of the ledger, and both are describing the same trade.
An extra working year does three things at once: the pot grows untouched for a year, another year of contributions goes in, and the retirement it has to fund gets one year shorter. Retiring a year earlier runs the same three effects in reverse. So there is exactly one honest way to weigh the decision: put a number on what the year buys, then decide whether the year itself is a price worth paying. The first half is arithmetic, and it is below. The second half is personal, and no table can settle it.
Meet Priya, 60, with a £500,000 pension pot, weighing retirement now against one final year. She wants her pot to support steady spending, in today's money, to age 90. While working she adds £20,000 a year to her pension including tax relief and her employer's contributions.
| Retire at 60 | Retire at 61 | |
|---|---|---|
| Pot at retirement | £500,000 | £532,500 |
| Years to fund (to 90) | 30 | 29 |
| Sustainable spending, today's money | £23,306 a year | £25,400 a year |
| Change | +£2,093 a year, for life (+9.0%) |
Read the gain both ways round, because both readings are true. Working one more year buys £2,093 a year, every year, for the rest of Priya's life. And retiring at 60 instead of 61 costs £2,093 a year, which is the price tag on that first year of freedom. Neither sentence is the "right" one. They are the same sentence.
Information and guidance only. Not personal advice. Priya is a fictional persona and the model is deliberately simple: it ignores tax on withdrawals, the state pension, and market variation, all of which change individual answers. Investment values can fall as well as rise. Verify decisions with a qualified FCA-authorised adviser before acting.
The extra year is really three separate effects stacked. Splitting them changes how the decision looks, because the parts are not equally fixed.
| Effect | What happens | Adds to yearly spending |
|---|---|---|
| One fewer year to fund | The same pot spreads over 29 years instead of 30 | +£543 |
| One more year of growth | £500,000 compounds untouched for a year (+£12,500 real) | +£596 |
| One more year of contributions | £20,000 more goes in | +£954 |
| Total | +£2,093 |
The largest slice is the contributions, and that is the honest, slightly awkward finding: nearly half the benefit of "one more year" is simply that money kept going in. Someone able to save hard in other ways, or with a strong employer match worth staying for, gets a different answer than someone whose contributions would be modest. It also means the arithmetic compounds quietly against very long delays: each further year buys a similar-sized slice, but each is bought with a year that is gone either way.
Two things this model deliberately leaves out, both real. Tax: pension withdrawals beyond the tax-free element are taxable income, so gross and spendable differ, which is worked properly in the withdrawal-order page. And the state pension: from state pension age (66 now, rising to 67 by 2028) a full new state pension adds £12,548 a year regardless of when work stopped, which softens the stakes of this decision in both directions.
The arithmetic above prices what the year buys. The other column of the ledger holds what the year spends, and it only ever spends one currency.
The year handed over is a year from the start of retirement, not the end. Early retirement years tend to be the most active ones: the ones with the energy for the long trip, the house project, the grandchildren at their most demanding and most fun. A year added at 60 is not interchangeable with a year at 85, and no later windfall buys it back. That is the whole case for the "retire as soon as possible" framing, and it is a serious case.
The serious case on the other side: £2,093 a year for life is not a small number against £23,306, and for a household whose plan sits at the edge, as in the sequence-of-returns page, one extra year also shortens the window in which an early market slump can do lasting damage. A plan with little spending flexibility buys more safety per working year than a flexible one.
Where the balance lands depends on health, on how the work feels, on what the money is for, and on how adjustable the household's spending is. The arithmetic cannot make the decision. What it can do is stop the decision being made by a vague fear that was never priced.
Methodology. Sustainable spending solves W = P ÷ f(n) where f(n) = (1 − 1.025−n) ÷ 0.025 × 1.025, the factor for withdrawals at the start of each of n years at 2.5% real growth. Retire at 60: £500,000 ÷ 21.4535 = £23,306 over 30 years. Retire at 61: pot £500,000 × 1.025 + £20,000 = £532,500, then £532,500 ÷ 20.9649 = £25,400 over 29 years. Decomposition holds exactly: £23,306 + £543 + £596 + £954 = £25,400. All arithmetic machine-checked before publication. Published 7 August 2026 · figures last verified 7 August 2026.
Sonuswealth is pre-launch. The app runs this arithmetic on real numbers: the pot, the contributions, the state pension and the tax, together on one timeline.