PAYE Tax Code: How Paying Tax Through PAYE Works in 2026/27

If you complete a Self Assessment tax return, receive a company pension, or are employed under PAYE, you may be able to pay certain tax liabilities without making a separate lump-sum payment. Instead, HMRC can collect eligible underpayments by adjusting your PAYE tax code, allowing the tax to be recovered gradually throughout the tax year. For a complete overview of how personal tax works across all income types and collection methods in the UK, our guide to personal tax for UK employees and self-employed individuals provides the broader framework before exploring PAYE tax codes in detail.

Understanding how your PAYE tax code works is important because any adjustment made by HMRC can directly affect your monthly take-home pay. Whether you’re an employee, pensioner, or Self Assessment taxpayer, knowing when HMRC can collect tax through PAYE, how a HMRC tax code is adjusted, and when you qualify can help you avoid unexpected deductions and manage your finances more effectively.

This guide explains who can pay tax through a PAYE tax code, the eligibility rules for the 2026/27 tax year, how paying tax through PAYE works in practice, and what to do if you think your tax code is incorrect.

Who Can Pay Tax Through a PAYE Tax Code?

This option is designed for taxpayers who submit a Self Assessment tax return but owe a relatively small amount of tax. Rather than requiring payment in one instalment, HMRC may recover the balance through your PAYE tax code, spreading the amount across the following tax year.

This commonly applies to:

• Employees paying Income Tax through PAYE
• Recipients of company pensions
• Individuals who complete a Self Assessment tax return
• Taxpayers with eligible underpayments that meet HMRC’s coding-out rules

For business owners who employ family members through PAYE, understanding how tax codes apply to those employees is equally important our guide on the tax rules for employing family members in your business covers the PAYE obligations, allowable salary levels, and HMRC compliance requirements that apply in those situations.

What Is a PAYE Tax Code?

Your PAYE tax code tells your employer or pension provider how much Income Tax should be deducted before you receive your salary or pension payments. HMRC may change this code if adjustments are needed, including collecting certain underpaid taxes from a previous Self Assessment return. Rather than asking you to make a separate payment, HMRC can issue a tax code adjustment so the amount owed is collected automatically through payroll over the course of the tax year. For a full explanation of what the letters and numbers in your tax code mean including common codes such as 1257L, BR, and 0T see our guide on understanding UK tax codes and what they mean.

Rather than asking you to make a separate payment, HMRC can issue a tax code adjustment so the amount owed is collected automatically through payroll over the course of the tax year. This process is commonly referred to as having your tax “coded out”.

When Can You Pay Tax Through Your PAYE Tax Code?

You may be able to pay tax through your PAYE tax code if all of the following conditions apply:

• You owe less than £3,000 in Self Assessment tax.
• You already pay Income Tax through PAYE, for example because you are employed or receive a company pension.
• You submit your paper Self Assessment tax return by 31 October 2026, or your online return by 30 December 2026, allowing HMRC enough time to collect the tax during the 2026/27 tax year.

If these conditions are met, HMRC will usually collect the tax automatically by adjusting your HMRC tax code, unless you specifically ask them not to.

Why Filing Before 30 December Matters

Although the final online Self Assessment filing deadline remains 31 January 2027, taxpayers who want HMRC to collect eligible underpayments through their PAYE tax code must normally submit their online return by 30 December 2026. Filing after this date generally means any tax due must be paid directly to HMRC by the normal payment deadline.

When You Cannot Pay Tax Through Your PAYE Tax Code

You cannot always use a PAYE tax code to spread tax payments. HMRC will normally require direct payment where:

• You do not receive enough PAYE income for the tax to be collected.
• The adjustment would result in more than 50% of your PAYE income being deducted as tax.
• The adjustment would more than double the amount of tax you normally pay through PAYE.
• You originally owed more than £3,000 but reduced the balance below this limit by making a part payment.

Where any of these situations apply, HMRC will usually ask you to pay the outstanding balance directly instead of collecting it through a tax code adjustment.

How Paying Tax Through PAYE Works in Practice

When HMRC collects tax through your PAYE tax code, the amount you owe is spread across the tax year rather than being paid as a single lump sum. This approach can make budgeting easier for many taxpayers, particularly where the balance is relatively small.

Once your HMRC tax code has been updated, your employer or pension provider automatically applies the revised code through payroll. As a result:

• Your PAYE tax code will change.
• You will pay slightly more Income Tax each pay period.
• Your monthly take-home pay will reduce until the outstanding tax has been collected.
• No separate monthly action is normally required from you.

Although paying tax through PAYE is convenient, it is still important to review your payslips and coding notice to ensure the adjustment is accurate.

It is also worth noting that certain payments made through payroll such as redundancy payments can affect both your tax code and your overall tax position for the year. Our guide on how redundancy pay is taxed under PAYE explains how these payments interact with your tax code and what HMRC expects to be reported.

Advantages and Disadvantages

Benefits

• Avoids paying the full tax bill in one payment.
• Spreads the cost across the tax year.
• Payments are collected automatically through payroll.
• Helps reduce short-term cash flow pressure for eligible taxpayers.

Things to Consider

• Your take-home pay will be lower throughout the year.
• An incorrect tax code adjustment could result in paying too much or too little tax.
• If your circumstances change during the year, your PAYE tax code may need updating again.

For a full explanation of the most common triggers that cause HMRC to issue a new tax code and what each change means for your pay, see our guide on the reasons your tax code might change during the year.

Common Reasons HMRC Changes Your Tax Code

HMRC may update your HMRC tax code for several reasons, not just to collect underpaid Self Assessment tax. Common examples include:

• Collecting tax owed from a previous Self Assessment return.
• Changes to employment or pension income.
• Updates to taxable benefits, such as company cars or private medical insurance.
• Changes to your Personal Allowance or other tax reliefs.
• Correcting information received from employers or pension providers.

If you receive a coding notice that you do not understand, it is worth checking the figures promptly. Errors left uncorrected can continue affecting your tax throughout the year.

In some cases, particularly when starting a new job or receiving income from a new source, HMRC may also apply an emergency tax code  our guide on how emergency tax codes work and when they apply explains what triggers an emergency code, how it affects your deductions, and what steps to take to get it corrected.

What If Your PAYE Tax Code Is Wrong?

If you believe your PAYE tax code is incorrect, don’t ignore it. An incorrect code could mean you pay too much tax or build up an underpayment that HMRC later recovers. You should compare your coding notice with your employment income, pension income, benefits, and any information reported on your Self Assessment tax return.

For a step-by-step guide on where to find your tax code and how to verify it against your circumstances, our resource on how to check your tax code with HMRC walks you through the process in full. If something doesn’t look right, contact HMRC or seek professional advice before the issue affects your future tax payments.

Key Points to Remember

• Eligible Self Assessment underpayments can often be collected through your PAYE tax code.
• You normally need to file your online tax return by 30 December if you want HMRC to collect the tax through PAYE in the following tax year.
• The normal Self Assessment filing deadline remains 31 January.
• Always check any PAYE tax code issued by HMRC to ensure it reflects your current circumstances.
• Reviewing your coding notice early helps prevent unexpected deductions from your salary or pension.

For those who want to review their specific tax code position for the 2025/26 tax year, our dedicated guide on checking your tax code for 2025/26 sets out what to look for and how to confirm your code is correct for that particular year.

Conclusion: Understanding and Reviewing Your PAYE Tax Code

A change to your PAYE tax code can affect your take-home pay without being immediately obvious. In many cases, these adjustments are linked to Self Assessment underpayments, benefits in kind, or updates received by HMRC from employers and pension providers.

It is important to understand why your HMRC tax code has changed and whether the figures being collected through your salary or pension are correct. Reviewing your position early can help prevent overpayment or unexpected underpayment being carried forward into future tax years.

Where a tax code change follows a redundancy situation, it is also worth understanding what portion of any redundancy payment is tax-free our guide on tax-free redundancy payments and the HMRC rules that apply explains the exemptions available and how they interact with your overall tax position for the year.