Savings Interest Pushed You Into Higher-Rate Tax: What to Do

In the UK, savings interest is treated as taxable income. It is added to an individual's total income to determine both the Income Tax band they fall into and the amount of tax they owe. For some people, particularly those whose employment or pension income already sits near the boundary between the basic and higher rate bands, the addition of savings interest can push their total income into the higher rate band at £50,270. When this happens, both the amount of tax owed on savings interest and the size of the Personal Savings Allowance change.

This guide explains the rules that govern how savings interest is taxed, what happens when it moves total income across a tax band threshold, and how HMRC collects any tax that is due. Unless stated otherwise, all figures reflect the 2025/26 tax year. Any proposed future changes announced in Budgets are subject to legislation and may change.

Savings interest is added to your other income to work out your total taxable income and which tax band applies. If that combined total exceeds £50,270, the portion above that threshold is taxed at the higher rate (40%), and the Personal Savings Allowance drops from £1,000 to £500.

Since April 2016, banks and building societies have paid interest gross, meaning no tax is deducted at source. Instead, they report interest to HMRC annually after the end of each tax year. HMRC then either adjusts a PAYE tax code or expects the individual to report the interest through Self Assessment, depending on the circumstances.

Interest earned within an ISA does not count towards taxable income and does not affect the Personal Savings Allowance.

Savings Interest as Taxable Income

Savings interest is classified as taxable income under the Income Tax (Trading and Other Income) Act 2005 (ITTOIA 2005), Part 4, which sets out how savings income is taxed.

When an individual earns interest on savings held outside of an ISA, that interest is added to their other income — such as employment income, pension income, or self-employment profits — to arrive at a total figure. This total determines which Income Tax band applies and therefore how much tax is due on the savings interest.

How Tax Is Collected

Banks and building societies are required to report savings interest to HMRC under the Income Tax (Deposit-takers and Building Societies) (Interest Payments) Regulations 2008 (SI 2008/2682). This reporting happens annually after the end of the tax year on 5 April.

For individuals who pay tax through PAYE — typically employees and pensioners — HMRC uses the reported interest data to adjust the individual's tax code. The adjustment is made for the current tax year based on the previous year's interest figures. This appears in the tax code as an "untaxed interest" deduction. The effect is that tax on savings interest is spread across the year through reduced take-home pay.

For individuals who need to report through Self Assessment, the savings interest is declared on the tax return, and any tax owed is paid directly.

The Personal Savings Allowance

The Personal Savings Allowance (PSA) allows a certain amount of savings interest to be earned tax-free each year. The amount of the allowance depends on the individual's overall tax band:

• Basic rate taxpayers: £1,000 of savings interest tax-free.
• Higher rate taxpayers: £500 of savings interest tax-free.
• Additional rate taxpayers: £0 — no Personal Savings Allowance is available.

The PSA is determined by adding savings interest to other income to establish which tax band the total falls into. Importantly, the PSA thresholds are set using England and Northern Ireland tax bands for all UK residents, including those in Scotland.

The Starting Rate for Savings

A separate provision exists for individuals with low non-savings income. The starting rate for savings provides up to £5,000 of savings income taxed at 0% for individuals whose non-savings income is below £17,570. This £17,570 figure is calculated as the Personal Allowance of £12,570 plus the £5,000 starting rate band.

Critically, the £5,000 starting rate band is reduced by £1 for every £1 of non-savings income above the Personal Allowance. If non-savings income reaches £17,570 or more, the starting rate for savings does not apply at all.

Tax Bands and Thresholds (2025/26)

The key income thresholds that determine how savings interest is taxed are as follows. The Personal Allowance is £12,570, which is the amount of income that can be earned before any Income Tax is due. This allowance is frozen at this level until at least April 2028 under current legislation. For individuals with income above £100,000, the Personal Allowance is reduced by £1 for every £2 of income above that level, reaching zero at £125,140.

The higher rate threshold is £50,270, which is the sum of the Personal Allowance (£12,570) and the basic rate limit (£37,700). This threshold is frozen until at least the 2027/28 tax year under current legislation. When total income (including savings interest) exceeds this level, the Personal Savings Allowance reduces from £1,000 to £500.

The additional rate threshold is £125,140. At this income level, the Personal Allowance has been fully tapered away, the additional rate of 45% applies, and the Personal Savings Allowance is £0.

Current and Future Tax Rates on Savings Income

The current tax rates on savings income are 20% at the basic rate, 40% at the higher rate, and 45% at the additional rate. As of the 2025/26 tax year, these are the enacted rates. Any future changes to savings income tax rates would require legislation through a Finance Act.

Key Timelines and Deadlines

The annual cycle for savings interest and tax operates according to several fixed dates. After 5 April each year, banks and building societies report savings interest to HMRC. HMRC then uses this data to match taxpayer records and, for PAYE taxpayers, adjusts tax codes for the current year based on the previous year's interest.

Between June and March of the following tax year, HMRC sends P800 tax calculation letters to PAYE taxpayers where there has been an overpayment or underpayment of tax. These letters inform the taxpayer of any tax owed or any refund due.

If an individual needs to register for Self Assessment, the registration deadline is 5 October following the end of the relevant tax year. For the 2024/25 tax year, this means registration by 5 October 2025. The online Self Assessment filing deadline is 31 January following the end of the tax year (paper returns are due by 31 October). Payment of any tax owed is also due by 31 January. Payments on account may also be required by 31 July for the subsequent year.

Individuals who believe they have overpaid tax on savings interest can claim a refund using form R40 or through their Self Assessment return. This claim must be made within four years of the end of the relevant tax year.

Self Assessment Registration Threshold

HMRC guidance requires Self Assessment registration where untaxed savings and investment income exceeds £10,000 in a tax year. This applies even if the individual is employed and normally pays tax through PAYE. The registration deadline is 5 October following the end of the tax year in question.

"I thought savings interest was tax-free"

Since April 2016, banks and building societies have paid interest without deducting tax at source. This means the full gross amount appears in the account. However, this does not mean the interest is tax-free. It means that the responsibility for ensuring the correct tax is paid has shifted from the bank to a combination of HMRC systems and, in some cases, the individual.

The Personal Savings Allowance does provide a genuine tax-free amount — £1,000 for basic rate taxpayers and £500 for higher rate taxpayers — but any interest above the allowance remains taxable.

"My salary is below £50,270, so I'm a basic rate taxpayer"

The tax band that applies to savings interest is determined by total income, not just employment income. If an individual earns £49,000 from employment and receives £2,000 in savings interest, their total income is £51,000, which crosses the higher rate threshold. In this scenario, the portion of income above £50,270 falls into the higher rate band, and the Personal Savings Allowance drops from £1,000 to £500.

"ISA interest counts towards my Personal Savings Allowance"

Interest earned within an ISA does not count towards the Personal Savings Allowance and remains entirely tax-free. The overall ISA allowance is £20,000. Cash ISA interest sits outside the savings interest tax system altogether.

"I only need to worry about tax on savings if I fill in a Self Assessment"

HMRC can collect tax on savings interest through PAYE tax code adjustments without the individual needing to file a Self Assessment return. The PAYE system handles this automatically for many employees and pensioners. Under HMRC guidance, Self Assessment becomes necessary when untaxed savings and investment income exceeds £10,000, or in other specific circumstances.

"The Personal Savings Allowance is on top of my other allowances"

The Personal Savings Allowance and the starting rate for savings are separate provisions. They can work together — for example, an individual with very low non-savings income may benefit from both the starting rate for savings and the PSA. However, the PSA does not stack on top of the basic rate band; it provides a tax-free slice within the band that already applies.

Scottish Taxpayers

Scottish taxpayers are subject to different Income Tax bands for non-savings income. However, savings income tax rates and the thresholds used to determine the Personal Savings Allowance are set using UK (England and Northern Ireland) tax bands for all UK residents. This means a Scottish taxpayer's PSA is calculated on the same basis as a taxpayer in England, regardless of the Scottish Income Tax rates that apply to their employment or self-employment income.

Joint Accounts

Interest earned in a joint account is split equally between account holders by default for tax purposes. If the actual beneficial interest differs from a 50/50 split — for example, because one person contributed more to the account — the account holders can contact HMRC to request a different allocation.

Marriage Allowance

The Marriage Allowance permits the transfer of 10% of the Personal Allowance (£1,260) between spouses or civil partners. The lower earner must have income below the Personal Allowance, and the higher earner must be a basic rate taxpayer. This transfer is worth up to £252 per year. However, it does not affect the Personal Savings Allowance amount. The PSA is determined solely by the individual's overall tax band.

ISA Allowance

As of the 2025/26 tax year, the overall ISA allowance is £20,000. No separate statutory cash ISA cap applies. Interest earned within an ISA remains entirely tax-free and does not count towards the Personal Savings Allowance.

See our guide on [Individual Savings Account Allowances](/isa-allowance-explained-how-the-20000-limit-works) for more details on ISA limits.

P800 Tax Calculation Letters

PAYE taxpayers who have had too much or too little tax collected will receive a P800 tax calculation letter from HMRC. These are sent between June and March of the following tax year. If no P800 letter has been received by 31 March following a year in which savings interest exceeded the allowance, HMRC guidance suggests contacting HMRC to ensure the correct tax has been paid.

Overpayment Refunds

Individuals who have overpaid tax on savings interest — for example, because their total income was lower than HMRC estimated — can reclaim the overpaid amount using form R40. This can also be done through a Self Assessment return if one is filed. The time limit for making such a claim is four years from the end of the relevant tax year.

For more on claiming overpaid tax, see our guide on Claiming a Tax Refund. Note: This link is a placeholder for a future guide, but aligns with the topic.

When savings interest pushes total income above £50,270, two things change simultaneously. The tax rate on the portion of income above the threshold increases from 20% to 40%, and the Personal Savings Allowance halves from £1,000 to £500.

For employed individuals and pensioners who pay tax through PAYE, HMRC typically handles this through a tax code adjustment. HMRC estimates the current year's savings interest based on what was reported for the previous year, and adjusts the tax code to collect the estimated tax through the payroll. This means the individual may see a change in their tax code and a corresponding reduction in take-home pay without needing to take any action themselves.

For individuals whose untaxed savings and investment income exceeds £10,000, HMRC guidance requires Self Assessment registration. The interest is then reported on the tax return, and any tax owed is calculated and paid through the Self Assessment system.

Because HMRC's estimate of current-year savings interest is based on the prior year's data, there can be discrepancies. If interest rates change significantly or if an individual's savings balances change, the estimate may be too high or too low. Any difference is typically resolved after the end of the tax year, either through a revised tax code, a P800 letter, or through Self Assessment.

Is savings interest taxed at source in the UK?

No. Since April 2016, banks and building societies pay interest gross, without deducting tax. They report the interest to HMRC annually, and any tax due is collected either through PAYE tax code adjustments or through Self Assessment.

What is the Personal Savings Allowance for 2025/26?

The Personal Savings Allowance is £1,000 for basic rate taxpayers, £500 for higher rate taxpayers, and £0 for additional rate taxpayers. The allowance is determined by the individual's total income including savings interest.

Does ISA interest count towards the Personal Savings Allowance?

No. Interest from ISAs does not count towards the Personal Savings Allowance and remains entirely tax-free. The overall ISA allowance is £20,000.

What is the starting rate for savings?

The starting rate for savings provides up to £5,000 of savings income at 0% tax for individuals whose non-savings income is less than £17,570. The £5,000 band is reduced by £1 for every £1 of non-savings income above the Personal Allowance of £12,570.

When do I need to register for Self Assessment because of savings interest?

HMRC guidance requires Self Assessment registration where untaxed savings and investment income exceeds £10,000 in a tax year. The registration deadline is 5 October following the end of the relevant tax year.

How does HMRC collect tax on savings interest if I'm employed?

HMRC adjusts the PAYE tax code to collect tax on savings interest for employed individuals and pensioners. The adjustment is based on the previous year's reported interest and appears as an "untaxed interest" deduction in the tax code.

What happens if I've overpaid tax on savings interest?

A refund of overpaid tax on savings interest can be claimed using form R40, or through a Self Assessment return if one is filed. The claim must be made within four years of the end of the relevant tax year.

Are savings interest tax rates changing?

As of the 2025/26 tax year, savings income tax rates are 20% (basic rate), 40% (higher rate), and 45% (additional rate). Any future changes to these rates would require legislation through a Finance Act.

How is savings interest taxed for Scottish taxpayers?

Scottish taxpayers have different Income Tax bands for non-savings income, but savings income tax rates and the Personal Savings Allowance thresholds are determined using UK (England and Northern Ireland) tax bands. This applies to all UK residents.

How is interest on a joint account taxed?

Interest from a joint account is split equally between account holders by default. If the actual contribution split is different, account holders can contact HMRC to request a different allocation.

What should I do if I haven't received a P800 letter?

HMRC sends P800 tax calculation letters between June and March following the end of the tax year. If no letter has been received by 31 March and savings interest exceeded the allowance, HMRC guidance suggests contacting HMRC to ensure the correct tax has been paid.

• Savings interest is taxable income in the UK and is added to total income to determine the applicable tax band.
• The Personal Savings Allowance provides £1,000 of tax-free savings interest for basic rate taxpayers, £500 for higher rate taxpayers, and nothing for additional rate taxpayers.
• When savings interest pushes total income above £50,270, the allowance halves and the tax rate on the excess increases.
• Banks pay interest gross and report it to HMRC annually. For PAYE taxpayers, HMRC collects tax through tax code adjustments.
• HMRC guidance requires Self Assessment registration where untaxed savings and investment income exceeds £10,000.
• Individuals with low non-savings income may also benefit from the starting rate for savings, which provides up to £5,000 of savings income at 0%.
• Interest earned in ISAs remains entirely outside this system. As of the 2025/26 tax year, savings income tax rates are 20%, 40%, and 45%; any future changes would require legislation through a Finance Act.
• Overpaid tax can be reclaimed within four years using form R40 or through Self Assessment.

For more on ISAs, check out our guide to Cash ISA vs Easy Access: Which is Better?.

Related: AER vs Gross Rate Explained | Claiming Back Tax After a Spouse Dies | ISA Allowance Rules.