Pension Contribution Calculator

The pension contribution calculation starts with annual salary and applies the employee and employer contribution percentages. Employee contributions are shown as a gross contribution and as a net cost after basic-rate relief, using a relief-at-source style assumption.

The projection adds monthly employee and employer contributions to the current pension pot, then compounds the balance using the chosen annual growth rate. The retirement income estimate uses a simple 4% drawdown rule: projected pot x 4% divided by 12. This is a planning shortcut, not a guarantee. Defined benefit pensions, salary sacrifice, higher-rate tax relief claims, investment charges and inflation are not modelled.

Use the result as a practical planning estimate for annual salary, employee contribution, employer contribution, tax relief, projected pot, drawdown income. The calculator is designed to make the main moving parts visible immediately, so it is most useful when you want to compare scenarios, sense-check a decision, or understand why one input changes the final result.

Before relying on the number, check whether your situation includes anything outside the calculator scope. Common examples are local rules, provider fees, payroll timing, special reliefs, bank holidays, tariff changes, exchange-rate markups, unusual tax codes, or personal circumstances that need official guidance or professional advice.

To make the estimate more accurate, use figures from the most recent bill, payslip, lender quote, receipt, official notice or provider screen you have. Rounded inputs are fine for quick comparisons, but precise inputs are better when you are deciding whether something is affordable or comparing two similar options.

Re-run the calculator whenever a key assumption changes, such as a new rate, different term, changed salary, updated threshold, extra fee, altered usage pattern or different date range. Keeping those assumptions fresh is often more useful than trying to make one calculation perfect.

If you are using the result for a formal decision, keep a note of the inputs you used and the date of the calculation. That makes it easier to compare the estimate with a later quote, bill, payslip or official calculation.