Smart Money Calculator

UK pension planning

UK Pension Salary Sacrifice Calculator

Model how pension salary sacrifice can change take-home pay, pension contributions, income tax, National Insurance, and student loan repayments for the 2025/26 UK tax year.

Uses UK 2025/26 tax-year assumptions for scenario modelling.

Use this calculator to compare your current pension salary sacrifice with a new contribution level. It estimates the effect on take-home pay, pension contributions, income tax, National Insurance, student loans, and selected employer contribution rules.

Salary Information

Monthly equivalent: £2,500

Additional Income

Total: £0 / mo

No monthly additions

Total: £0 / yr

No one-off annual items

Use for bonus or any single annual taxable payment.

RSUs are modelled as vesting quarterly (4 times per year).

Employer Pension Matching

Employer matches your contribution up to this percent of salary (1:1). Set 0% to disable.

If your employer passes on their NI saving from salary sacrifice into your pension, enter the share here (often 0%–100%).

Deductions & Benefits

Pension Contribution Comparison

0%5.0%50%
0%10.0%50%
Assumptions

What this calculator assumes

These assumptions make the scenario transparent and keep tax-year-specific logic visible.

Tax year

2025/26

The calculator uses the tax thresholds and rates encoded in the local UK pension calculation library for this tax year.

Regions

England, Wales, Northern Ireland, Scotland

Income tax can be modelled with England/Wales/NI or Scottish bands. National Insurance is modelled with UK employee rates.

Student loans

Plan 1, Plan 2, Plan 4, Postgraduate, None

Student loan deductions are estimated from annual adjusted income using the selected plan threshold and rate.

Employer contributions

Configurable match and NI sharing

Employer pension match, employer NI rate, and shared employer NI savings can be adjusted in advanced inputs.

Annual allowance

60,000 default warning threshold

The page warns when modelled pension contributions exceed the default annual allowance threshold.

Not advice

Scenario modelling only

Results are estimates. Check payroll, pension provider rules, HMRC guidance, and regulated advice where needed.
Examples

Common salary sacrifice scenarios

Use these examples as starting points for thinking about the trade-off between take-home pay and pension contributions.

Basic-rate employee

A worker increasing salary sacrifice from 5% to 10%.

  • The main saving usually comes from employee National Insurance and income tax.
  • The result can show whether the extra pension contribution costs less than expected in take-home pay.
  • Employer matching can materially change the value of increasing contributions.

Higher-rate employee

A worker comparing pension contributions against take-home pay.

  • Higher-rate tax relief can make salary sacrifice more efficient than contributing from net pay.
  • Student loan deductions may also change when adjusted income changes.
  • The marginal tax-rate view helps show the cost of each extra pound in pension.

Near the personal allowance taper

A worker around the 100,000 adjusted-income threshold.

  • Salary sacrifice can reduce adjusted income used for personal allowance tapering.
  • Small contribution changes can have a larger take-home impact around tax cliffs.
  • Annual allowance and employer rules should be checked before acting.
FAQ

UK pension salary sacrifice questions

Important limitations

This calculator is for scenario modelling only. It does not account for every payroll rule, pension scheme rule, protected pension status, benefit interaction, or personal financial circumstance. Check your payslip, employer pension rules, HMRC guidance, and regulated advice before making decisions.