The cost of waiting
Promotion to a higher band or grade usually increases salary immediately and for every subsequent year on the higher rate. Over five or ten years, promoting two years earlier can mean tens of thousands of pounds difference in gross earnings, even if the annual gap between bands looks modest.
What calculators compare
Promotion timing calculators model two scenarios: promote this year versus promote in X years, using illustrative pay on your current band and the target band. Optional second promotion steps compare multi-hop paths (for example Band 5 to 6 to 7). Results are gross and exclude allowances.
Reality beyond the model
Vacancies, funding, performance, training requirements and personal circumstances all affect real promotion dates. Use financial comparison to inform conversations, not as a promise of promotion. Pair with pay progression tools to see in-band growth on each band.