Tax on Savings Interest Calculator
Savings Accounts
Account 1
How the Calculator Works
This calculator determines your tax liability on savings interest by first establishing your income tax band, which directly affects your Personal Savings Allowance (PSA). The PSA is the amount of interest you can earn tax-free each year outside of ISAs and other tax-advantaged accounts.
The calculation process follows these steps:
- Income Assessment: Your total annual income determines your tax band (basic rate, higher rate, or additional rate taxpayer).
- PSA Allocation: Basic rate taxpayers receive £1,000 PSA, higher rate taxpayers receive £500, and additional rate taxpayers receive £0.
- Interest Calculation: Total interest earned across all savings accounts is calculated based on balances and rates provided.
- Tax Computation: Any interest exceeding your PSA is taxed at your marginal income tax rate (20%, 40%, or 45%).
Special Consideration: If your total income is below £17,570, you may also qualify for the starting rate for savings, which provides an additional allowance of up to £5,000 of tax-free interest. This allowance reduces by £1 for every £1 of other income above the personal allowance.
Tax Bands & Personal Savings Allowances 2025/26
| Tax Band | Taxable Income Range | Personal Savings Allowance | Tax Rate on Excess Interest |
|---|---|---|---|
| Basic Rate | £12,571 – £50,270 | £1,000 | 20% |
| Higher Rate | £50,271 – £125,140 | £500 | 40% |
| Additional Rate | Over £125,140 | £0 | 45% |
Important: These figures assume you have the standard personal allowance of £12,570. If your income exceeds £100,000, your personal allowance is reduced by £1 for every £2 earned above this threshold, completely disappearing at £125,140.
Starting Rate for Savings
Low-income savers may benefit from an additional tax advantage. If your total non-savings income (wages, pension, etc.) is less than £17,570, you might qualify for the starting rate for savings. This provides up to £5,000 of tax-free interest at a 0% rate.
The starting rate for savings works as follows:
| Non-Savings Income | Starting Rate Allowance Available |
|---|---|
| £12,570 or less | Full £5,000 |
| £12,571 – £17,570 | £5,000 minus (income above £12,570) |
| £17,570 or more | £0 (not available) |
Tax-Efficient Savings Strategies
Maximise ISA Allowances
Cash ISAs allow you to earn interest completely tax-free, regardless of the amount. The annual ISA allowance for 2025/26 is £20,000. Interest earned in ISAs does not count towards your Personal Savings Allowance, so you can use both tax advantages simultaneously.
Consider Joint Accounts
If you’re in a higher tax band but your partner is in a lower band, splitting savings between you can reduce overall tax. Each person has their own PSA, so a basic rate taxpayer couple could earn £2,000 interest tax-free.
Time Your Interest Payments
Tax is due on interest in the year it’s paid or becomes available, not when it’s earned. Fixed-term bonds that pay interest at maturity can help you manage which tax year the interest falls into, potentially avoiding exceeding your PSA in a single year.
Premium Bonds Alternative
Prizes from NS&I Premium Bonds are tax-free and don’t count towards your PSA. Whilst the odds mean average returns are lower than traditional savings accounts, high earners exceeding their PSA might find them attractive.
Common Scenarios Explained
Scenario 1: Basic Rate Taxpayer with £30,000 Income
Sarah earns £30,000 annually and has £25,000 in savings earning 4% interest (£1,000 per year). As a basic rate taxpayer, she has a £1,000 PSA. Her entire interest of £1,000 falls within her allowance, so she pays no tax on her savings.
Scenario 2: Higher Rate Taxpayer with £60,000 Income
James earns £60,000 and has £40,000 in savings earning 5% interest (£2,000 per year). As a higher rate taxpayer, his PSA is £500. He has £1,500 of taxable interest (£2,000 – £500). Tax due: £1,500 × 40% = £600.
Scenario 3: Additional Rate Taxpayer with £150,000 Income
Emma earns £150,000 and has £50,000 in savings earning 4.5% interest (£2,250 per year). As an additional rate taxpayer, she has no PSA. All £2,250 is taxable. Tax due: £2,250 × 45% = £1,012.50.
Scenario 4: Low Income with Starting Rate
David earns £15,000 annually and has £80,000 in savings earning 3% interest (£2,400 per year). His starting rate allowance is £5,000 – (£15,000 – £12,570) = £2,570. Combined with his £1,000 PSA, he can earn £3,570 tax-free. However, the starting rate applies first, so: £2,570 (starting rate) + £1,000 (PSA) = £3,570 tax-free. Tax on remaining £0 (since £2,400 < £3,570).
Frequently Asked Questions
Does interest from cash ISAs count towards my Personal Savings Allowance?
No. Interest earned from cash ISAs is completely tax-free and does not count towards your PSA. You can earn unlimited interest from ISAs without any tax implications, making them highly attractive for higher earners.
How does HMRC collect tax on my savings interest?
For most people, HMRC collects tax on savings interest by adjusting your tax code. Your employer or pension provider then deducts the tax through PAYE. If you don’t pay tax through PAYE, you may need to complete a Self Assessment tax return.
What happens if I move between tax bands during the year?
Your PSA is determined by your marginal tax rate when the interest is paid or becomes available. If you move tax bands, the PSA applying to each interest payment will be based on your circumstances at that specific time.
Do I need to report my savings interest to HMRC?
Banks and building societies report interest directly to HMRC, so you typically don’t need to report it yourself. However, if you complete a Self Assessment tax return for other reasons, you must include all savings interest on your return.
Can I claim back tax if my bank deducted it from my interest?
Since 6 April 2016, UK banks and building societies have paid interest gross (without deducting tax). However, if tax was incorrectly collected, you can claim it back from HMRC using form R40.
Does the Personal Savings Allowance apply to other investment income?
No. The PSA only applies to savings interest from banks, building societies, and similar accounts. Dividends from shares have a separate Dividend Allowance (£500 for 2025/26), and other investment income has different tax treatment.
What if my savings interest pushes me into a higher tax band?
This is possible. If your salary is near the threshold between bands, savings interest can push you into the next band. This affects both your income tax on the interest and reduces your PSA from £1,000 to £500 (or from £500 to £0).
Are savings accounts for children taxed?
Interest on children’s savings is usually tax-free because most children don’t earn enough to pay tax. However, if the money was gifted by a parent and earns over £100 interest per year per parent, the interest is taxed as the parent’s income.
Comparing ISAs vs Regular Savings Accounts
| Feature | Cash ISA | Regular Savings Account |
|---|---|---|
| Tax on Interest | Tax-free (0%) | Taxed above PSA |
| Annual Limit | £20,000 (2025/26) | No limit |
| Interest Rates | Often competitive | Variable (can be higher) |
| Counts Towards PSA | No | Yes |
| Access to Funds | Varies by account type | Varies by account type |
| Best For | Higher earners, larger savings | Those within PSA limits |
Strategic Approach: For maximum tax efficiency, prioritise filling your ISA allowance first if you’re likely to exceed your PSA. Basic rate taxpayers with smaller savings pots may find regular accounts offering higher rates more beneficial.
When to Seek Professional Advice
Whilst this calculator provides accurate estimates for straightforward situations, certain circumstances require professional guidance:
- Complex income sources (self-employment, rental income, foreign income)
- Large investment portfolios with multiple income streams
- Non-UK residency or domicile issues
- Trust income or offshore accounts
- Income near tax band thresholds where planning could save significant tax
- Recent inheritance or windfall requiring tax-efficient deployment
A qualified tax adviser or financial planner can provide personalised strategies to minimise your tax liability whilst keeping your savings working efficiently.
References
HM Revenue & Customs (2024). Tax on savings interest. GOV.UK. Available at: https://www.gov.uk/apply-tax-free-interest-on-savings
HM Revenue & Customs (2024). Income Tax rates and Personal Allowances. GOV.UK. Available at: https://www.gov.uk/income-tax-rates
HM Revenue & Customs (2024). Check how much tax you pay on dividends and interest from savings. GOV.UK. Available at: https://www.gov.uk/guidance/check-how-much-tax-you-pay-on-dividends-and-interest-from-savings
HM Revenue & Customs (2024). Savings and Investment Manual. GOV.UK Internal Guidance.
Financial Conduct Authority (2024). Consumer Guide to Savings Accounts. FCA Publications.