Does Salary Sacrifice Affect Your Mortgage? (2026/27)
Written by James Whitfield · Last checked 18 October 2026 · Checked against 2026/27 HMRC rates.
Salary sacrifice lowers your contractual salary, and that is the figure many mortgage lenders start from. Here is how much borrowing it can cost, what lenders look at, and what to do in the months before you apply.
It can. Salary sacrifice reduces the salary in your contract and on your payslip1, and many lenders size a mortgage from that lower figure. At a 4.5× income multiple, a £6,000 pension sacrifice on a £60,000 salary can cut the maximum loan by £27,000. Some lenders will use your pre-sacrifice salary for pension sacrifice if your employer confirms it, so ask a broker before you apply, and do not stop your pension without weighing the tax you would give up.
- Under salary sacrifice your contractual pay really is lower; the pension is paid as an employer contribution.1
- Lenders' policies differ: some use payslip basic pay after sacrifice, some add back pension sacrifice, some look at P60 or SA302 income.
- Your P60 shows the post-sacrifice figure, so it matches what many lenders see.1
- Car and cycle-to-work sacrifices are usually treated less kindly than pension sacrifice, because the benefit is not savings.
- Stopping a pension sacrifice costs tax and NI relief: on £6,000 a higher-rate taxpayer gives up about £2,520 a year.23
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How much borrowing can salary sacrifice cost?
Lenders cap loans at a multiple of income, commonly 4 to 4.5 times, and then run an affordability check on your outgoings. If they start from the post-sacrifice salary, every £1,000 sacrificed can take £4,000 to £4,500 off the maximum loan.
| Salary before sacrifice | £60,000 |
| Pension salary sacrifice (10%) | £6,000 |
| Salary after sacrifice | £54,000 |
| Maximum loan at 4.5× pre-sacrifice salary | £270,000 |
| Maximum loan at 4.5× post-sacrifice salary | £243,000 |
| Potential borrowing lost | £27,000 |
Many buyers never hit the cap because affordability, deposit or the property price binds first. The difference matters most when you need the full multiple.
What do mortgage lenders actually look at?
A lender usually asks for recent payslips, your latest P60 and sometimes an employer reference. Under salary sacrifice the payslip shows the reduced basic pay (often with a sacrifice line) and the P60 shows the reduced annual pay.1 Whether the lender adds the pension sacrifice back is its own policy decision; there is no single rule. Because the money is going into your pension rather than being spent, some lenders treat pension sacrifice as income they can count, especially with an employer letter confirming the gross salary.
Benefits bought through sacrifice, such as an electric car, are different: the lender may treat the lower salary as your income and the car as a commitment you have chosen.
What to do before you apply, step by step
- Work out both figures. Your pre-sacrifice salary from your contract, and the post-sacrifice figure on your payslip and P60.
- Ask a broker which lenders use the pre-sacrifice salary for pension sacrifice, and whether they need an employer letter.
- Get an employer letter confirming your gross salary before sacrifice and the sacrifice arrangement.
- Check when you can change the sacrifice. Most schemes allow changes at a set window or after a life event such as buying a home; check your scheme rules before assuming you can stop.
- If you reduce it, price the cost. On a £6,000 sacrifice a higher-rate taxpayer loses about £2,400 of tax relief and £120 of NI saving a year; a basic-rate taxpayer about £1,200 and £480.23
- Restart afterwards. Once the mortgage completes, put the sacrifice back in place at the next opportunity.
Is it worth pausing a pension sacrifice to borrow more?
Only if the extra borrowing is essential. Pausing means paying full tax and NI on the money and losing any employer NI saving your employer passes on. If you can buy the home you want on the post-sacrifice figure, or with a lender that adds the sacrifice back, keeping the pension going is usually the better deal. Use the salary sacrifice calculator to see the exact take-home and pension figures for your salary.
Frequently asked questions
Does salary sacrifice affect how much I can borrow on a mortgage?
It can. Salary sacrifice lowers your contractual salary, and many lenders use that lower figure. At 4.5 times income, a £6,000 sacrifice can reduce the maximum loan by £27,000. Some lenders add pension sacrifice back if your employer confirms your gross salary.
Do mortgage lenders use salary before or after sacrifice?
It depends on the lender. Some use payslip basic pay after sacrifice, some add back pension sacrifice with an employer letter, and some look at P60 income, which is after sacrifice. A broker can tell you which lenders do what.
Should I stop salary sacrifice before applying for a mortgage?
Only if you need the extra borrowing. Stopping a £6,000 pension sacrifice costs a higher-rate taxpayer about £2,520 a year in lost tax and NI relief. Check first whether a lender will use your pre-sacrifice salary.
Is a salary sacrifice car treated differently from pension sacrifice?
Often, yes. Lenders tend to see a car sacrifice as a commitment you have chosen and use the lower salary, while pension sacrifice is savings that some lenders will add back.
Can I change my salary sacrifice when I buy a house?
Many schemes allow changes at an annual window or after a life event such as a house purchase, but it depends on your employer's scheme rules. Ask HR before you rely on it.
This guide is general information, not mortgage, financial or tax advice. Lender policies change; speak to a mortgage broker before applying.
Sources & references
Every headline figure in this guide is checked against the official HMRC and GOV.UK pages below and reflects the confirmed 2026/27 tax year. Each link opens the relevant official page in a new tab.
- Salary sacrifice and the effects on PAYE (HMRC) ↗ https://www.gov.uk/guidance/salary-sacrifice-and-the-effects-on-paye
- Income Tax rates and Personal Allowances ↗ https://www.gov.uk/income-tax-rates
- National Insurance rates and categories ↗ https://www.gov.uk/national-insurance-rates-letters