Season ticket loan repayments are deducted after tax, not before. Your employer calculates income tax and National Insurance on your full gross salary first, and the loan instalment comes out of what’s left. The loan doesn’t reduce your taxable income and doesn’t save you any tax, though the loan itself stays tax-free as long as the balance stays within £10,000.
How the Payroll Sequence Works
When payroll runs, income tax and National Insurance are worked out on your entire gross salary. That produces your net pay figure. Only then does the season ticket loan instalment get subtracted. On your payslip, the repayment shows as a separate line, distinct from tax, pension contributions, or student loan deductions. Your taxable earnings are identical whether you have a season ticket loan or not.
A quick example. If you earn £30,000 and repay £150 a month on a season ticket loan, HMRC still taxes you on the full £30,000. The £150 comes out of the cash you actually receive. You’re repaying a debt, and debt repayment is a personal expense with no tax relief attached.
Why It Isn’t Salary Sacrifice
The confusion usually comes from mixing season ticket loans up with salary sacrifice. Under a salary sacrifice arrangement, you formally agree to a lower contractual salary in exchange for a non-cash benefit. Your gross pay drops, so you genuinely pay less income tax and National Insurance on the reduced figure. The tax saving is real because the money never counts as your earnings.
A season ticket loan works differently. Your employer hands you a lump sum to buy a travel pass, and you pay it back in instalments. The money passes through your hands as cash, which is why HMRC treats repayment as a personal financial obligation rather than a tax-efficient benefit. HMRC categorises season ticket loans separately from salary sacrifice arrangements for public transport costs.1GOV.UK. Expenses and Benefits: Public Transport
The £10,000 Threshold That Keeps the Loan Tax-Free
An interest-free loan from your employer is technically a taxable perk, because you’re getting credit without paying the interest you’d owe a bank. Section 180 of the Income Tax (Earnings and Pensions) Act 2003 creates an exemption: no benefit-in-kind tax applies if the total outstanding balance on all your employer loans stays at or below £10,000 throughout the tax year.2Legislation.gov.uk. Income Tax (Earnings and Pensions) Act 2003 – Chapter 7 Most annual season tickets sit comfortably inside this limit.
The £10,000 cap is aggregate. If your employer also gave you a separate relocation loan of £6,000 and your season ticket loan is £5,000, the combined £11,000 pushes you over. At that point, HMRC calculates a taxable benefit based on the difference between what you’d have paid in interest at the official rate and what you actually paid, which for an interest-free loan is nothing.3GOV.UK. Beneficial Loan Arrangements (480: Chapter 17)
What Happens If You Cross the Threshold
If your combined employer loans do exceed £10,000, the taxable benefit is calculated using HMRC’s official rate of interest. For the 2025–26 tax year, that rate is 3.75%.4Legislation.gov.uk. The Taxes (Interest Rate) (Amendment) Regulations 2025 HMRC works out the interest you would have paid at 3.75% on the outstanding balance, subtracts any interest you actually paid, and treats the difference as taxable income.5HM Revenue & Customs. Employment Income Manual – EIM26103
The numbers rarely hurt season ticket borrowers. A £5,000 loan at 3.75% would generate a notional benefit of around £187 over a full year. If that were taxable, a basic-rate taxpayer would owe roughly £37 in extra tax. Below the £10,000 aggregate threshold, the benefit is completely exempt.
Why the Loan Is Still Worth Taking
Even without a tax saving, the loan is a genuinely useful benefit. Annual season tickets are almost always cheaper per journey than paying daily or weekly, and the discount can be substantial on longer commutes. The loan removes the barrier of finding several thousand pounds upfront, letting you spread the cost interest-free across the year. It’s effectively a 0% credit facility with no fees, no credit check, and no impact on your credit score.
The real comparison isn’t “loan versus no loan” but “annual ticket paid in instalments versus daily tickets paid out of pocket.” If an annual Travelcard saves you £600 compared to buying monthlies, the loan delivers that saving even though the repayments come from taxed income. The financial benefit is the transport discount, not a tax break.