UK Salary Sacrifice Calculator 2025/26 | Calculate Tax & NI Savings

Salary sacrifice (or salary exchange) is an arrangement where you agree to give up part of your gross salary in exchange for non-cash benefits from your employer. Because your contractual salary is reduced, you pay less income tax and National Insurance on the sacrificed amount. Common examples include pension contributions, cycle to work schemes, and electric vehicle leasing.

Your savings depend on your marginal tax rate. Basic rate taxpayers save approximately 28% (20% tax + 8% NI), higher rate taxpayers save around 42% (40% tax + 2% NI), and additional rate taxpayers save about 47% (45% tax + 2% NI). For example, if you're a higher rate taxpayer and sacrifice £1,000 towards a pension, you save £420 in tax and NI.

Yes, potentially. Salary sacrifice reduces your gross salary on paper, which some mortgage lenders use for affordability calculations. However, many lenders understand salary sacrifice and will consider your pre-sacrifice salary. It's worth discussing with your mortgage broker or providing evidence of your true earning capacity.

Most salary sacrifice arrangements allow you to opt out at specific times (e.g., annually) or if you experience a "life event" such as marriage, divorce, birth of a child, or significant change in household income. The rules depend on your employer's scheme, so check your contract terms.

With salary sacrifice, you never receive the money as salary - your employer contributes directly to your pension. You save both income tax AND National Insurance. With relief at source, contributions are taken from your net pay, and basic rate tax relief (20%) is added automatically.

Higher rate taxpayers must claim extra relief through self-assessment. Salary sacrifice is usually more beneficial due to NI savings.

For most people, yes. You can save 28-47% on the cost of a new bike depending on your tax band. A £1,000 bike could cost you as little as £530 (higher rate taxpayer). At the end of the hire period, you can typically purchase the bike for a small fair market value payment (often just 3-7% of the original price).

No, salary sacrifice is voluntary for employers. They need to set up and administer the scheme, which involves some administrative effort. However, many employers offer it because they also save on Employer's National Insurance (15%), making it beneficial for both parties.

Only if your reduced salary falls below the Lower Earnings Limit (LEL) of £6,396/year (2025/26). If you earn above this threshold, you'll continue to build qualifying years for State Pension. For most full-time employees with typical sacrifice amounts, this isn't a concern.