UK savings interest tax calculator 2026/27
Estimate tax on bank and building-society interest after unused Personal Allowance, the starting-rate band and Personal Savings Allowance.
Example figures Change them to match your circumstances.
How the Savings interest estimate works
Savings interest is stacked above non-savings income. The tool then applies unused Personal Allowance, the starting rate for savings and the Personal Savings Allowance before calculating tax on the remainder.
Rules checked
Read the checking method
What the result includes
- Unused Personal Allowance against interest
- The starting-rate band for savings
- The basic- or higher-rate Personal Savings Allowance
What to have ready
- Gross taxable interest for the tax year
- Salary, pension and other non-savings income
- Your beneficial share of joint-account interest
Questions about Savings interest
Does ISA interest belong in the calculator?
No. Interest within an ISA is tax-free and should be excluded from the taxable-interest entry.
Is the Personal Savings Allowance a deduction from income?
It is a 0% savings band, not a deduction. The interest still forms part of total income and can affect which rate band applies.
About this estimate
This is an annual estimate. Mixed income, Scottish rates, trusts, foreign interest and how HMRC collects tax can require a fuller calculation.