How much of a pay rise makes changing jobs worthwhile?

Advice about job moves often begins with a percentage such as 10% or 20%. That can be a useful prompt, but it is not a decision. Someone moving to a similar role with a shorter commute may accept a smaller increase than someone giving up remote work, taking on management responsibility, or joining a less established employer.

Choose the smallest improvement that would make the disruption of changing jobs feel worthwhile. Apply that percentage to your current base salary to create a first-pass target. Keep base salary separate from a discretionary bonus: guaranteed monthly pay and a possible future payment do not carry the same certainty.

A £2,000 annual increase in commuting does not mean that £2,000 more gross salary leaves you even. Income Tax, National Insurance, pension deductions, and possibly student loan repayments are taken before the remainder reaches your bank account. The gross pay needed to fund a new cost is therefore higher than the cost itself.

List the annual change in train fares, fuel, parking, lunches, coffee, childcare, and any equipment or home-working costs. Compare the result with the estimated change in take-home pay, not only with the headline salary increase.

A move from £50,000 at 37.5 hours a week to £58,000 at 45 hours looks like a 16% rise. Before allowing for annual leave, the base hourly rates are roughly £25.64 and £24.79. The higher salary is buying more of your time at a slightly lower rate.

Commute time matters too. Two additional 45-minute journeys on three office days add four and a half hours to the week. You do not have to give every personal hour a cash value, but you should see the time difference before deciding.

A new role can be worthwhile without winning every financial comparison. Better training, a clearer promotion path, more interesting work, or a healthier working pattern may justify a smaller immediate gain. Equally, a large increase may be inadequate compensation for an uncertain bonus, weak pension, long probation, or fragile employer.

Write down which non-financial improvements you are actually receiving. If the move is worse on the factors you value most, increase your required salary rather than hoping the headline number will make the drawbacks disappear.

Run the comparison three ways: the expected case, a cautious case with no bonus and higher travel costs, and a best reasonable case. A robust offer remains attractive in the cautious case. If the decision only works when every uncertain assumption goes well, you have identified useful points to negotiate.

The final target is not a market prediction. It is the price at which this particular move becomes worthwhile for you.