The tax year your fixed-rate bond interest really belongs to

A three-year fixed-rate bond earns interest steadily, month after month. For Income Tax, though, what usually matters is not when the interest was earned but when it became yours to use.

Fixed-rate bonds come in two broad shapes. Some pay or credit interest along the way, every month or every year. Others roll it all up and pay it in one sum when the bond matures. Both can carry the same headline rate. For tax, they can behave quite differently.

The rule HMRC applies

Savings interest is taxable in the tax year in which it is received or "made available" to you. HMRC's Savings and Investment Manual explains that interest counts as made available once it has been credited to an account you are free to draw on, even if you never actually withdraw it. Interest is not spread back over the years in which it built up: interest that is paid late, for example, is taxed in the year it is received.

The UK tax year runs from 6 April to the following 5 April, so the current one, 2026/27, began on 6 April 2026.

Why access to the money matters

HMRC's manual works through the example of a five-year bond that credits interest every year. If the terms let the saver get at that interest before maturity, even with a penalty, the interest is taxed year by year as it is credited. If the saver cannot reach it before the bond matures, all of the interest is taxed in the year of maturity.

So the deciding question is not how often a statement shows interest being added. It is whether the account terms allow you to draw on that interest. Two bonds from the same provider can fall on different sides of this line, which is why the terms, rather than the product name, are the place to look.

The deciding question is whether the account terms allow you to draw on that interest.

A worked example

Take a basic rate taxpayer with no other savings interest who places £20,000 in a three-year fixed-rate bond paying 4% a year. To keep the arithmetic simple, the example ignores compounding. The Personal Savings Allowance for a basic rate taxpayer is £1,000 of interest a year at 0%.

Assumes a basic rate taxpayer throughout, no other taxable interest, no starting rate for savings and simple (not compound) interest. Each "year" is a tax year. Real bonds, rates and personal circumstances differ.

The total interest is identical, £2,400. In version A each year's £800 sits inside the allowance. In version B the whole amount lands in one tax year and £1,400 of it goes above the allowance. Whether that matters depends on the rest of the saver's income in that particular year.

The effect can also run the other way. Someone who expects to move from higher rate to basic rate, for example after retiring, sees their Personal Savings Allowance rise from £500 to £1,000. Interest paid in a later, lower-income year can then fall more comfortably within the 0% bands. Additional rate taxpayers have no Personal Savings Allowance at all.

For people with modest other income there is also the starting rate for savings: up to £5,000 of interest taxed at 0%, available in full only where other taxable income is low and gone entirely once it reaches £17,570.

Which side of 5 April

Because the tax year ends on 5 April, the maturity date of a bond paying at the end decides which year all of its interest falls into. A bond maturing on 3 April and one maturing on 7 April, opened a few days apart, can put their interest into different tax years.

For bonds that credit interest each year, the crediting date places each year's interest in a tax year.

How HMRC finds out and collects

Banks and building societies report each year's interest to HMRC after 5 April. Interest on ISAs is not taxed and is not counted, and interest on a joint account is normally split equally between the holders.

If your interest is £10,000 or less and tax is due, HMRC usually sends a tax calculation between June and the following March. It normally collects the tax by adjusting your tax code, which can include an estimate of the current year's interest. Where it cannot use a tax code, it sends a Simple Assessment instead. If your savings interest is more than £10,000, you need to complete a Self Assessment tax return. GOV.UK's own example: interest earned in 2025/26 is notified to you in 2026/27 and collected through your tax code in 2027/28.

That lag matters for a maturity bond. A one-off year of high interest can lead HMRC to estimate high interest for the following year too. If the bond has ended and the money is now in an ISA, or spent, it is worth checking the estimate in your tax code and telling HMRC if it no longer fits. Our explainer on why a second job or pension can be taxed oddly covers how to read a tax code.

Rates announced from April 2027

For 2026/27, savings income above the 0% bands is taxed at 20%, 40% or 45%. Budget 2025 announced that the rates on savings income would rise to 22%, 42% and 47% from 6 April 2027. The Budget on 28 October 2026 announced a further rise, to 24%, 44% and 49% from 6 April 2027, across the UK. Those latest rates are to be legislated in the Finance Bill 2026-27, so at the time of writing they are announced rather than law.

If they take effect, interest paid on or after 6 April 2027 and above the allowances would be taxed at the higher rates. For a bond that pays at maturity, the date the interest is paid, not the years over which it was earned, would decide which rates apply.

Who this matters for, and what to check

The timing question matters most to people whose interest is close to their allowances, and to people whose income is about to change, for example on retiring, starting to draw a pension or taking on a flexible pension withdrawal. Points to check:

• The maturity date of each bond, and which tax year it falls in.
• Whether interest is available to you before maturity under the terms.
• Your likely tax band in the year the interest is paid, which sets your Personal Savings Allowance.
• Whether total interest in a year could pass £10,000, which brings Self Assessment.
• Any estimate of interest in your tax code after a maturity year.

The short version

Interest is taxed in the year it is paid to you or made available, not in the years it was earned. A bond you cannot draw on until maturity puts all its interest into the maturity year; one whose interest you can reach each year is taxed year by year. Check the terms, the maturity date against 5 April, and your tax band in the year the money arrives. Higher savings rates from April 2027 have been announced but are not yet law.