Emergency Tax on Commission Explained

Scottish codes normally start with S and Welsh codes with C. Check the full code and basis with payroll if your payslip abbreviates them.

Commission is added to employment earnings. With a cumulative code, payroll considers taxable pay and tax already paid across the tax year so far. With a non-cumulative code, the current payment is assessed using only that period’s allowances and bands.

A large payment may therefore pass through higher bands in that period. That is different from HMRC deciding that all your future pay will be as high. Neither a large payment nor a separate payroll run automatically proves that HMRC has created a second employment or changed your code.

For a checked annual example, see £40,000 salary plus £15,000 commission. Do not divide its annual tax by 12 to predict the commission month. The £55,000 salary page is a full-year comparison.

Ask payroll to confirm:

• The gross commission and taxable pay recorded for the payment.
• The complete tax code, whether it is cumulative, and the tax week or month used.
• The previous pay and tax figures included in the calculation.
• Whether your P45 and any new HMRC code have been received and applied.

Then check your HMRC employment records and estimated income. Correct inaccurate details. Payroll can correct pay or processing errors, but HMRC normally decides changes to an issued tax code.

Our payslip checker helps you review deductions; it cannot confirm an exact commission refund without the relevant pay history. Keep the payroll calculation alongside your payslips.

For a new job, HMRC says to wait 35 days from starting for it to receive your income details before contacting it. Give payroll your P45. The starter checklist supplies details for your first payment; after you have been paid, use Check your Income Tax to review your code and correct your details.

After you correct your details, if a new code is needed, HMRC says it will notify you and your employer within 15 working days. For monthly pay it should then appear on the next or following payslip; for weekly pay, the third payslip.

These are different stages, not a promised refund date. If the new code does not appear, ask payroll whether they received it. Use HMRC’s correction guidance if the underlying records are still wrong.

During the tax year: a corrected cumulative calculation can repay overpaid PAYE through payroll. A non-cumulative code does not reconcile earlier periods in the same way. Ask payroll which basis the new code uses and whether an adjustment is due.

After the tax year: if HMRC sends you a P800, follow its refund instructions. Some letters require an online claim or a request for a cheque; others say a cheque will be sent automatically. There is no rule that every refund must be claimed online.

If you complete Self Assessment: include your actual pay and tax in your return; the final calculation accounts for tax already paid. Use the applicable refund process rather than assuming a large commission deduction will automatically be returned next month.

A refund is only due where you have paid more than you owe. Other income or a reduction in your Personal Allowance can change the result, particularly where adjusted net income exceeds £100,000.

No. Two people with the same salary and commission can have different deductions because the pay date, code, previous earnings, benefits, pension arrangements and Scottish tax status differ. A generic “typical overpayment” table cannot establish your entitlement.

Use the annual take-home calculator to understand an ordinary full-year scenario, then use the actual payroll figures and HMRC records to investigate that individual payslip. For the allowance taper, see the tax cliffs map.