Promotion Pay Comparison Calculator

Why gross pay and net take-home don't move in step

A promotion rarely delivers a net take-home increase that is proportionate to the gross pay increase, and there are two separate mechanisms behind this, both of which this calculator applies automatically to your figures.

The first is the income tax and National Insurance band structure — pushing your gross income across a threshold means the portion of pay above it is taxed noticeably harder than the pay you already earned below it.

The second mechanism is the PPS 2015 pension contribution tier structure, shown below. A promotion that pushes pensionable pay across one of these boundaries increases the contribution rate applied to the whole of pensionable pay, not just the portion above the threshold (in the typical scheme administration approach), which further reduces the net increase reaching your take-home pay — though, as with detective allowance, this higher contribution also buys a proportionately higher pension accrual, so it is not simply a cost with nothing in return. Because both of these effects depend on exactly where your current and new salaries fall relative to the thresholds, the actual net increase from any given promotion can only really be judged accurately by running the specific numbers, which is what this calculator is for.

How pension accrual improves after promotion — and what stays the same

A common misunderstanding about the CARE pension scheme is that a pay rise "recalculates" your whole pension based on the new, higher salary, in the way a final-salary scheme would have done. PPS 2015 does not work this way. Under a career average scheme, each year of service earns its own separate slice of pension, calculated as 1/55.3 of that specific year's pensionable pay, and once earned, that slice is fixed in real terms and simply revalued each year by CPI+1.25% — it is never recalculated based on a later, higher salary.

This means a promotion only affects pension accrual from the point it takes effect onwards. Every year of service already completed before the promotion keeps the pension slice it earned at the salary paid in that year, revalued for inflation as usual, completely unaffected by the promotion. From the promotion date forward, each new year of service earns a larger slice, calculated on the new, higher salary. So the pension benefit of a promotion is entirely forward-looking: the earlier in your career a promotion happens, the more years benefit from the higher accrual rate, and the greater the cumulative long-term pension impact. A promotion taken late in a career still increases pension accrual for the remaining years of service, but there are simply fewer of those years for the higher rate to apply to, so the total additional pension gained is smaller than the same promotion taken a decade earlier would have delivered.

Non-financial factors worth weighing alongside the numbers

This calculator deliberately focuses on the financial side of a promotion decision, because that is the part that can be modelled precisely and the part officers most often underestimate the complexity of. But pay is rarely the only, or even the primary, consideration in a promotion decision, and it is worth setting the financial figures alongside the practical realities of the new role before reaching a final view.

Increased responsibility is the most obvious factor — a promotion typically brings accountability for supervising, managing, or making higher-stakes operational decisions affecting more people, which suits some officers and does not suit others regardless of the pay involved. On-call and out-of-hours duties often increase markedly at higher ranks, particularly from Inspector upwards, which can have a real effect on family life and work-life balance that no salary figure captures. Some officers also find that promotion moves them away from frontline or specialist work they joined the higher rank's pathway to do, into a more administrative or managerial role, which is a significant consideration for those who value operational, hands-on policing over management responsibility.

None of these factors have a "correct" weighting against the financial numbers — they are genuinely personal — but a realistic promotion decision should treat the net pay and pension increase this calculator shows as one input alongside a clear-eyed assessment of what the new role will actually involve day to day, not as the deciding factor on its own.

How officers typically move onto a new rank's pay scale

When an officer is promoted, they do not simply start at the bottom of the new rank's pay scale. Most forces apply a minimum-increase principle: the officer moves to whichever point on the new rank's scale gives them at least a defined minimum increase over their current salary — often expressed as a specific percentage or cash amount above their pre-promotion pay — rather than automatically landing on the bottom point of the new rank's scale. The exact minimum increase policy, and how it is calculated, is set by each force rather than nationally standardised, so the specific pay point an individual officer lands on after promotion can only be confirmed with certainty by their own force's HR or pay department.

This matters for using this calculator realistically. If you are preparing for a promotion board or interview and want to model the likely financial outcome, it is worth checking your force's minimum-increase policy first, then selecting the pay point in the calculator that reflects where you would realistically land under that policy — which may well be higher than the bottom point of the new rank's scale — rather than assuming you will start at the bottom of the new scale. For an officer currently on a Sergeant pay point close to the top of that scale, for instance, an automatic move to Inspector PP1 might represent only a modest increase, whereas the force's minimum-increase policy might place them at Inspector PP2 instead, which this calculator will show delivers a meaningfully different net outcome.

Using this calculator to prepare for a promotion application

The most productive way to use this tool ahead of a promotion board or interview is to run several realistic scenarios rather than a single comparison. Start with your current pay point against the most likely landing point on the new rank's scale under your force's minimum-increase policy, and note the gross, net, and pension accrual differences. Then run a second scenario using the bottom point of the new rank's scale as a conservative floor, so you have a realistic range rather than a single number, in case your actual landing point differs from what you expect.

It is also worth running the comparison at a couple of different current pay points if you are early in a promotion process and unsure exactly when the promotion might take effect, since your current pay point (and therefore your current pension tier and tax position) may itself have moved by the time the promotion is confirmed. Having this range of figures to hand is useful not just for your own financial planning, but also gives you a grounded, specific answer if a promotion panel or your own manager asks what the financial change would mean for you — a well-prepared, realistic answer tends to land better than a vague sense that "the pay is better," and shows you have thought through the decision properly rather than assuming promotion is an unambiguous win in every respect. As with all calculators on this site, the figures are estimates based on current national pay scales and PPS 2015 rules, and your own force's payroll and HR teams remain the definitive source for your actual pay point and promotion policy.

Accounting for allowances when comparing ranks

Any comparison between your current rank and a target rank should also take into account whether the allowances you currently receive will continue after promotion. Location allowances such as the Met allowance or South East allowance are generally paid regardless of rank, so they typically carry across unchanged in a like-for-like promotion within the same force and area, and this calculator assumes they continue unless you tell it otherwise. Detective allowance and other role-specific payments are a different matter: they are tied to the role and qualification, not the rank, so a promotion that moves you out of a detective posting into a uniformed supervisory role, for example, could mean losing a detective allowance even as your base salary rises, while a promotion that keeps you within investigative work might retain it.

Because of this, the most accurate comparison is one where you think carefully about which allowances will genuinely continue in the new role, not just the new rank's base salary. Entering the correct combination of base salary and continuing allowances for both the "before" and "after" scenarios in this calculator, rather than comparing base pay scale figures alone, gives a far more reliable picture of the real change to your total gross pay, net take-home pay, and pension position.

A realistic timeline for the financial change

It is also worth being realistic about when a promotion's financial benefit actually begins to show up. Most forces implement a new salary from the effective date of promotion, so the change to gross and net pay tends to be immediate from your next pay period. The pension effect, by contrast, unfolds gradually: the higher accrual rate applies from the promotion date onwards, but because CARE pension is a year-by-year build-up rather than an instant recalculation, the cumulative pension benefit of a promotion only becomes substantial after several years of service at the higher rank. An officer who is promoted and then leaves the service, or is promoted again, only a year or two later will have banked a comparatively modest pension uplift from that one higher-accrual year, whereas an officer who remains at the new rank for a decade or more accumulates a much larger total pension benefit from the same promotion. This is a useful long-term perspective to keep alongside the immediate, more visible change to take-home pay that this calculator highlights.

Comparing multiple possible promotion routes

Some officers face a choice between more than one possible promotion route at a similar career stage — for example, a Sergeant weighing up a move to Inspector against staying at Sergeant rank but moving into a specialist role that carries its own allowance, or an Inspector considering whether to pursue Chief Inspector immediately or wait for a preferred posting to become available at that rank. In situations like this, it is worth running each realistic option through this calculator separately, using the same current pay point as the baseline each time, so that the net pay and pension outcomes are directly comparable across options rather than only comparing each option individually against your current position.

This is particularly useful when one route offers a smaller immediate pay increase but a stronger long-term progression path, against another that offers a larger immediate increase but a less certain route to further promotion afterwards. Seeing the concrete net take-home and pension accrual figures for each option side by side, rather than reasoning about them in the abstract, often clarifies which trade-off actually matters most to your own circumstances — particularly when combined with the non-financial factors around responsibility, on-call duties, and work-life balance discussed above, which frequently weigh just as heavily as the numbers themselves in a well-considered promotion decision.