UK Finance Planning

UK retirement calculator — quick income projection

A quick UK retirement calculator: model retirement income year by year across defined contribution and defined benefit pensions, ISAs, savings and the State Pension from a handful of inputs. For the broader workflow — saved plans, scenario comparison, flexible drawdown and Monte Carlo simulation — use the UK retirement planner.

Open the UK retirement planner

What a retirement projection needs

A usable projection combines your current assets, future contributions, a target retirement age, expected spending, growth and inflation assumptions, and the tax treatment of each income source. Changing any single assumption can move the outcome significantly, which is why comparing scenarios matters more than any single headline number.

Growth and inflation are separate

Investment growth and price inflation are independent variables. Entering a nominal growth rate alongside an inflation rate lets the projection show both the cash figures and their purchasing power in today's money.

Tax in retirement

Pension income is taxable as earned income, ISA withdrawals are not, and the State Pension is taxable but paid without tax deducted. Withdrawal order therefore changes the tax bill for the same level of spending.

The State Pension

The State Pension provides a foundation income from State Pension age, subject to your National Insurance record. Checking your forecast is the single most useful input into any retirement plan.

Calculator or planner?

This page is the quick tool: a fast projection from a few inputs, useful for a first look. The UK retirement planner is the fuller workflow — it stores your assets and assumptions, models each income source separately, and adds scenario comparison, flexible drawdown, Monte Carlo simulation and PDF export. Many people start with the calculator and move to the planner once the numbers matter.

Methodology, assumptions and limitations

  • 2026/27 tax rates and State Pension figures, verified on 21 August 2026.
  • Projections run on the growth, inflation and contribution assumptions you enter.
  • Long-horizon projections are highly sensitive to assumptions and are illustrations only.
  • Care costs, inheritance and changes to future tax policy are not modelled.
  • This is not regulated financial advice or a recommendation to take any action.

UK Finance Planning provides calculation and planning tools for education and comparison. It is not a financial adviser, is not authorised by the Financial Conduct Authority, and is unconnected to any similarly named advice firm. All results are estimates.

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