Question 1

How is UK income tax calculated?

Accepted Answer

Income tax is calculated on taxable income (gross minus personal allowance of £12,570). Basic rate: 20% on £12,571–£50,270; higher rate: 40% on £50,271–£125,140; additional rate: 45% above £125,140. Personal allowance tapers by £1 for every £2 above £100,000.

Question 2

What is National Insurance (NI)?

Accepted Answer

National Insurance (Class 1 employee) is charged at 8% on earnings between £12,570–£50,270 and 2% above £50,270. NI contributes to your State Pension entitlement and other benefits. Rates for 2024/25 were reduced from 12% to 8%.

Question 3

How does salary sacrifice pension affect take-home pay?

Accepted Answer

Salary sacrifice reduces your pensionable earnings before tax and NI are calculated. This means you pay less income tax AND less National Insurance — effectively the government and your employer subsidise your pension contribution.

Question 4

What is the personal allowance for 2025/26?

Accepted Answer

The UK personal allowance remains frozen at £12,570 through 2025/26. This means the first £12,570 of income is tax-free. However, if your income exceeds £100,000, the personal allowance tapers by £1 for every £2 above that threshold.

Item	Annual
Gross salary	£35,000.00
Pension (0% salary sacrifice)	−£0.00
Income tax	−£4,486.00
National Insurance	−£1,794.40
Take-home pay	£28,719.60

💷 UK Take-Home Pay Calculator

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