Second Job Tax UK 2026/27: Tax Codes, Allowance and National Insurance

Having a second job does not give you a second Personal Allowance. In the UK 2026/27 tax year, which runs from 6 April 2026 to 5 April 2027, you usually have one allowance for all of your taxable income. HMRC normally allocates most or all of it to one employment and uses a separate tax code for the other job.

The second job is not automatically taxed at a special “second-job rate”. The correct result depends on your total income, the tax code for each employment, your tax region and the National Insurance rules for each pay period. Use the Salary Calculator→ for an estimate using both jobs, then check the codes and year-to-date figures on your payslips.

How tax works with two jobs

HMRC adds your taxable income from all jobs and other taxable sources when it works out your Income Tax position for the year. It does not create a separate tax-free allowance for each employer. The standard Personal Allowance is £12,570 in 2026/27, although it can be reduced when adjusted net income is above £100,000 or changed by other circumstances.

Your employers still operate PAYE separately. One job may use a code such as 1257L, while the other may use BR, D0 or D1. Those codes are a way of dividing the allowance and applying an approximate marginal rate through payroll; they are not a second tax system. The total tax due is tested against your combined income for the tax year.

If you have a pension, taxable benefits or several short-term jobs, HMRC may use different codes or update them during the year. The label on one payslip is not enough to establish whether the overall tax is correct.

What BR, D0 and D1 mean for a second job

The common codes for a second employment are:

These are PAYE codes, not a guarantee that every pound from the second job will have that final annual rate. For example, a person with a small main job and a small second job might be better served by a split allowance. If HMRC has assigned BR but your combined income is below the level at which all of the second-job income should be taxed at 20%, PAYE may be too high until the code is corrected or the year-end position is reconciled.

Scotland has separate Income Tax bands. A Scottish taxpayer may receive codes with an S prefix, and the rates applied to the combined income can differ from those in England, Wales and Northern Ireland. Your main home and HMRC taxpayer record matter; the location of the second workplace does not by itself determine the rate.

Should the Personal Allowance be split?

HMRC can allocate the allowance between jobs rather than putting it all against one employment. A split can make deductions look more even, but it does not change the total annual allowance or reduce the tax due on combined income. It mainly changes when PAYE is collected.

Consider asking HMRC to review the split when:

• both jobs are continuing and pay similar amounts;
• the second job is large enough that BR, D0 or D1 creates an obvious mismatch;
• one job has stopped or its expected pay has changed;
• a pension, taxable benefit or other income has been added to the record; or
• your payslips show a code that does not match the information in your Personal Tax Account.

Do not ask an employer to invent a code. Update the employment details with HMRC; HMRC sends the revised code to the relevant payroll. Your employer then applies it from the next practical payroll run.

National Insurance is separate from Income Tax

Income Tax uses your annual taxable income and tax codes. Employee Class 1 National Insurance is generally worked out by each employer for each pay period, so the result can look different when you have two jobs. A second job can be below the usual employee threshold and still be taxable for Income Tax, or it can produce National Insurance in a pay period even when the combined annual picture looks different.

Employees with more than one job may qualify to defer some Class 1 National Insurance in specific circumstances. Deferral is not an exemption and it is not automatic: it changes when contributions are paid and HMRC can reconcile the position later. Apply only through the HMRC process if you meet the published conditions. Do not subtract a deferral from an ordinary take-home estimate unless it has been approved and your payroll is applying it.

The National Insurance guide explains the main thresholds and rates, while the Salary Calculator→ lets you compare the estimated deductions for each job.

How to check a second-job tax code

Use this sequence when you start a second job or the deductions look wrong:

What if too much tax was deducted?

An over-deduction can happen when a job starts before HMRC has matched the new employment, when an old job remains open, or when the allowance is allocated using an outdated income estimate. It does not follow that every BR code is wrong: BR can be an appropriate way to collect tax when the allowance is already being used by the main job.

First correct the underlying HMRC record. If the code changes during the tax year, payroll may refund the overpayment through a later payslip. If the tax year has ended, HMRC compares the total reported pay and tax and may issue a calculation or refund. If your second job is seasonal or has stopped, check that the leaving date and final pay have been recorded.

An underpayment can also arise if the total income was higher than HMRC expected or if an allowance was allocated twice. Keep enough of the combined earnings available for a possible adjustment and do not treat a temporary refund as proof that the annual liability is settled.

Second job versus self-employed side income

A second employment is normally reported by an employer through PAYE. A freelance or business activity is different: it may require Self Assessment, and the tax and National Insurance rules are not the same as for a second payroll job. Do not describe freelance receipts as a “second job” when deciding whether to register or file.

If the extra work is self-employment, read the Side Hustle Tax guide and check the relevant registration and reporting rules. If it is an ordinary employment contract, start with HMRC's multiple-job record and the tax codes on the payslips.

Frequently Asked Questions

Evidence and decision checks

A reliable second job tax 2026 27 review starts by fixing the tax year and the date on which the relevant event happened. Record the person's or business's status, the income or transaction category, the amount before tax, tax already withheld, and any election or claim being relied on. Do not combine a headline figure with a final liability: the result can change when another income source, a payment date, an ownership interest or a qualifying condition is added.

Keep the source documents behind every important input. Depending on the subject, that may include payslips, invoices, bank statements, contracts, provider statements, travel records, HMRC notices, payroll submissions, valuations or correspondence. Where an amount is apportioned, write down the method and retain the underlying total. If a correction is made, preserve the original figure and explain the reason, date and evidence for the replacement.

Before relying on the result, check the current official guidance for the same tax year and jurisdiction. Distinguish enacted law from a consultation, draft measure, announcement or future proposal, and record the effective date. Reconcile the final estimate to the relevant return, payroll record or HMRC account. A calculator or explanatory guide can support a decision, but it cannot replace the eligibility test or the official filing and payment process.

Evidence and decision checks

A reliable second job tax 2026 27 review starts by fixing the tax year and the date on which the relevant event happened. Record the person's or business's status, the income or transaction category, the amount before tax, tax already withheld, and any election or claim being relied on. Do not combine a headline figure with a final liability: the result can change when another income source, a payment date, an ownership interest or a qualifying condition is added.

Keep the source documents behind every important input. Depending on the subject, that may include payslips, invoices, bank statements, contracts, provider statements, travel records, HMRC notices, payroll submissions, valuations or correspondence. Where an amount is apportioned, write down the method and retain the underlying total. If a correction is made, preserve the original figure and explain the reason, date and evidence for the replacement.

Before relying on the result, check the current official guidance for the same tax year and jurisdiction. Distinguish enacted law from a consultation, draft measure, announcement or future proposal, and record the effective date. Reconcile the final estimate to the relevant return, payroll record or HMRC account. A calculator or explanatory guide can support a decision, but it cannot replace the eligibility test or the official filing and payment process.

For an estimate using both employments, open the Salary Calculator→. For the mechanics of the code itself, see Tax Codes Explained.

Official sources

• GOV.UK: tax with more than one job
• GOV.UK: tell HMRC about a new or additional job
• GOV.UK: employer rates and thresholds for 2026 to 2027
• HMRC: employer guide to PAYE and National Insurance 2026/27
• GOV.UK: defer National Insurance

These GOV.UK and HMRC sources are the official references for multiple-job tax codes, Personal Allowance allocation, PAYE, National Insurance and HMRC updates discussed in this guide.