Budget simulator

You are Chancellor. Move the sliders to change spending and tax, and watch the effect on borrowing and on debt over five years.

Spending (£ billion per year)

Health (£140–260 bn) £200 bn

Education (£70–140 bn) £101 bn

Defence (£30–90 bn) £56 bn

Welfare (excl. pension) (£140–300 bn) £210 bn

State pension (£90–160 bn) £125 bn

Tax rates (change in percentage points)

Income tax (−5 to +5 pts) no change

VAT (−5 to +5 pts) no change

Corporation tax (−5 to +5 pts) no change

Result

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Total spending

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Total revenue

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Borrowing this year

Projected net debt, applying your choices each year. Assumes a 4% interest rate and a fixed economy — see assumptions below.
Year	Debt (£ bn)	Debt (% of GDP)

Assumptions used in this model

Baseline spending £1,368 bn, revenue £1,238 bn, debt £2,917 bn.
Each 1 percentage point of income tax ≈ £8 bn, VAT ≈ £8.5 bn, corporation tax ≈ £3.7 bn. Approximate revenue from a 1 percentage point change to each rate (HMRC 'ready reckoner' style, illustrative).
Debt in future years is the running total of borrowing plus assumed interest. Economic growth, behavioural responses, and inflation are not modelled.