Prison officer mortgage calculator

What this prison officer mortgage calculator does

Most mortgage calculators take one salary figure. A prison officer's income is not one number: it is base pay, a 20% unsocial hours allowance built into the published salary, sometimes committed extra hours on a 39 or 41-hour contract, Payment Plus for qualifying duties, and at some prisons a market supplement. A lender can treat each of those differently, and the difference can be thousands of pounds of borrowing.

This calculator splits your income into those components, lets you choose how much of each a lender might count, and shows the effect on illustrative borrowing, price range, monthly payment (including a stressed payment if rates were higher), the share of take-home pay and stamp duty. It is a way to see which parts of your pay matter most before you speak to an adviser, not a promise of what any lender will do.

What we know, and what we do not

We know the published pay: from 1 April 2026 a National Band 3 Prison Officer earns £34,928, £36,150 or £36,778 on 37 hours including the 20% unsocial hours allowance, with higher figures for 39 and 41-hour contracts and for London zones. We know Payment Plus is £23 an hour from 1 April 2026, non-consolidated and non-pensionable, and paid only for specified duties. We know market supplements of £1,500 to £3,500 a year are paid to Band 3 officers at 18 named prisons, are non-pensionable, and are reviewed each year.

We do not know how any particular lender treats those elements, and we will not pretend to. Lenders set their own rules and change them. So the 'how a lender might count it' percentages and the income multiple are editable illustrations. Use them to ask better questions, not to predict a decision.

How the calculation works

1. Your pay components come from the published 2026/27 PSPRB tables for your band, pay point, contract hours and zone, plus Payment Plus hours and any supplement you enter.
2. Each component is multiplied by the percentage you choose a lender might count (for example 100% of base pay and the allowance, 50% of Payment Plus).
3. The counted income is multiplied by an income multiple (default 4.5) to give illustrative borrowing. Add your deposit for an illustrative price range and loan-to-value.
4. The monthly payment is a standard capital-repayment calculation at the rate and term you enter, and again at a stressed rate. Both are compared with your estimated take-home pay.
5. Property tax is estimated for where you are buying: Stamp Duty in England and Northern Ireland, LBTT in Scotland and LTT in Wales, with first-time buyer relief where it applies.

A worked example

A National Band 3 officer at the top pay point on 37 hours has £36,778 of contracted pay (£30,648 base plus the £6,130 unsocial hours allowance) and does 8 hours a month of Payment Plus (£2,208 a year). If a lender counted only contracted pay at 4.5 times, illustrative borrowing is about £165,500. If it also counted half the Payment Plus the figure is about £170,500, and if it counted all of it about £175,400. The Payment Plus is worth about £10,000 of borrowing in the best case, which is why being able to show a steady 12-month history matters.

On £165,500 over 25 years at 5%, the capital repayment is roughly £967 a month. At a stressed 8% it is about £1,277. Those are the figures to hold against your take-home pay, about £2,366 a month on the same pay before any Payment Plus.

Stamp duty, LBTT and LTT, in brief

In England and Northern Ireland the standard residential rates are 0% to £125,000, 2% from £125,001 to £250,000, 5% from £250,001 to £925,000, 10% to £1.5 million and 12% above. First-time buyers pay nothing up to £300,000 and 5% on £300,001 to £500,000, and get no relief above £500,000 (GOV.UK). An additional property attracts a 5% surcharge on top.

In Scotland, LBTT (Revenue Scotland) is 0% to £145,000, 2% to £250,000, 5% to £325,000, 10% to £750,000 and 12% above; first-time buyer relief raises the nil band to £175,000, and the Additional Dwelling Supplement is 8% of the whole price on an additional home of £40,000 or more. In Wales, Land Transaction Tax (Welsh Revenue Authority) is 0% to £225,000, 6% to £400,000, 7.5% to £750,000, 10% to £1.5 million and 12% above, with separate higher rates for additional homes and no first-time buyer relief. Pick where you are buying and the calculator estimates the right tax for the price it works out.

Preparing your income evidence

• Keep 12 months of payslips if you rely on Payment Plus, so the history is easy to show.
• Ask HR for a letter confirming your grade, contracted hours and which allowances are part of your contract.
• Know what is contracted and what is not. Base pay and the unsocial hours allowance are part of your pay; Payment Plus is paid for qualifying duties and is not guaranteed.
• Check any market supplement is still in place at your prison and what its reduction path is.
• Do not take on new credit just before applying.

Things that sit outside this calculator

• Your credit file and existing commitments. Loans, cards, car finance and childcare costs reduce what a lender will offer. They are not modelled here.
• Probation and contract type. We have no verified source on how lenders treat officers in training or probation, so we do not model it. Ask the lender.
• Fees and the true cost of borrowing. Product fees, valuation, legal and moving costs sit on top of the deposit.
• Where you buy. Property tax differs in Scotland and Wales (pick the nation in the calculator), and prices vary widely between prison areas; see cost of living by region.

Go further with the Mortgage Readiness Pack

The free calculator shows what changes the answer. The paid Mortgage Readiness Pack (£9.99, one payment, no subscription, 14-day money-back guarantee) turns that into something you can take to a meeting: an income and overtime evidence pack built from your own 12 months of figures, lender-style scenario tables, a deposit and price grid, an adviser question list with your numbers filled in, and a printable summary.

Related help

If your plan depends on overtime, try the overtime to deposit calculator. For a wider look at the topic read our prison officer mortgage guide and the first-time buyer guide.