File your tax return by 30 December to pay your tax bill through your tax code - Landlords Financial | Bookkeeping Services Manchester

The normal filing deadline for the 2024/25 Self Assessment tax return is 31 January 2026. However, if you have some tax to pay under Self Assessment and you also pay tax under PAYE, if you file your return by 30 December 2025, you may be able to pay what you owe through an adjustment to your tax code rather than through the Self Assessment system. This may be the case if, for example, you are employed or receive a pension and also have some income from self-employment or property or you have taxable investment income.

Conditions

Tax due under Self Assessment can only be collected through your tax code if the following conditions are met:

· the total amount that you owe through Self Assessment is £3,000 or less;

· you already pay tax through PAYE (for example, because you are employed or receive a company pension); and

· you filed a paper return by 31 October 2025 or an online return by 30 December 2025.

It should be noted that if the amount you owe is more than £3,000, you cannot make a part payment to reduce the outstanding amount to £3,000 or less and pay the balance through your tax code.

However, even if these conditions are met, you will not be able to pay your Self Assessment tax bill through your tax code if any of the following apply:

· you do not have sufficient PAYE income to collect the amount that is due;

· you would end up paying more than 50% of your income in tax; or

· you would end up paying over twice as much tax as you normally do.

How it works

If you have filed your return by the deadline and you are eligible to pay your tax bill through your tax code, HMRC will automatically adjust your tax code to collect the amount of tax that you owe, unless you indicate that you do not wish to pay your tax in this way. The adjustment will take the form of a deduction from your allowances. The amount of the deduction will depend on how much you owe and your marginal rate of tax. For example, if you pay tax at 40% and owe tax under Self Assessment of £1,000, your allowances will be reduced by £2,500 (40% of £2,500 = £1,000).

The adjustment will be made to your 2026/27 tax code. As a result of the adjustment, you will pay what you owe for 2024/25 in equal instalments throughout 2026/27 each time that you are paid. If you are paid monthly, you will effectively pay your bill in 12 monthly instalments.

Advantages and disadvantages

Paying tax through your tax code allows you to pay it later – instead of having to settle the bill by 31 January 2026, you pay it in equal instalments over the 2026/27 tax year. This provides a cashflow benefit and removes the need to find the funds to pay the bill in one hit.

Paying your bill through your tax code also provides an automatic interest-free instalment plan. Unlike a Time to Pay arrangement, you do not need to set it up, and there is no interest to pay either.

However, having your tax deducted from your pay will reduce your take-home pay, so it may not be for everyone.

File your tax return by 30 December to pay your tax bill through your tax code - Landlords Financial | Bookkeeping Services Manchester

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