How to work out your disposable income (UK)

What disposable income actually means

Disposable income is what is left of your pay once everything you have to pay has gone out: tax and National Insurance first, then the bills you cannot skip. It is the money you decide about.

There are two definitions in circulation, and it helps to know which one you are looking at. Economists and the ONS call income after direct taxes "disposable" and income after essentials "discretionary". In everyday use the words have swapped: when someone asks "how much disposable income do I have?" they almost always mean the money left after rent, bills and food. This guide uses the everyday meaning, because it is the figure you can do something with.

Run it for a fairly typical full-time salary: £38,000, a little under the £39,039 median for full-time employees in April 2025, with 5% going into a workplace pension and a Plan 2 student loan being repaid.

Take-home pay is what you receive. Disposable income is what you decide.

How to work it out, step by step

The sum follows the order UK payroll runs it in. Do it once by hand and every payslip after that makes sense.

If you would rather not do the arithmetic, the disposable income calculator runs exactly these lines from your salary, pension percentage, student loan plan and essentials, and shows where each pound of the month goes.

Take-home pay at six salaries

Before the essentials come off, here is what 2026/27 tax and National Insurance leave of six salaries, each paying 5% into a pension and with no student loan.

The last column is the one to notice. Take-home falls from 82% of gross at £25,000 to 64% at £110,000, because each band of income is taxed harder than the one below it. That is why a pay rise never feels as big as the letter says: of a £1,000 rise, after tax and National Insurance you keep £720 at £38,000, £580 at £60,000, and only £380 at £110,000.

Scotland sets its own income tax bands and rates, so Scottish taxpayers will see slightly different tax figures. National Insurance and student loans work the same way across the UK.

What counts as an essential

This is the line most people get wrong, in both directions. An essential is spending that would carry on whether or not you decided anything this month.

• Housing. Rent or mortgage, plus service charges or ground rent. Usually the largest item by a distance.
• Council tax, energy, water, broadband and phone. The direct debits that would keep coming if you never opened another email.
• Food and household basics. The weekly shop, not the takeaways. Be honest about which is which.
• Getting to work. Fuel, parking, the train, or the car costs a job depends on.
• Insurance and minimum debt repayments. Car, home and life cover, and the minimum on any loan or card. Anything you pay above the minimum is a choice, and a good one, but it belongs in the disposable column.
• Childcare. Nursery, wraparound care, maintenance you pay. For many households the second-largest line.

Subscriptions, eating out, clothes beyond the basics, holidays, the gym: none of these are essentials, however permanent they feel. They come out of disposable income, which is the whole point. If the number after essentials looks healthy but your balance never grows, that gap is where the money went, and you have just found it.

£700 of difference in the bills is £700 of difference in disposable income, one for one. Nothing on the tax side moves that much. It is why the cost of housing shapes this number more than a pay rise does, and why a flatmate, a cheaper commute or a remortgage can be worth more than a promotion.

What is a good disposable income?

There is no official figure, and the national statistic that sounds like one measures something else. The useful benchmark is a share of take-home, not a number of pounds.

The ONS puts median household disposable income at £36,700 for the year to March 2024. That is income after direct taxes and benefits, adjusted for household size and before any housing or bills - the economists' definition, not the one in this guide - so it says little about what a person has left at the end of the month. Two rules of thumb say more.

1. 1Saving 10% of take-home is a solid position, 20% is a strong oneOn our £38,000 example that is £238 to £476 a month. The example has £882 of room, so a 20% rate is well within reach without touching an essential.
2. 2The 50/30/20 split: half to needs, 30% to wants, 20% to savingA budgeting rule rather than a law, and for many households the needs slice is nearer 60% than 50%. When it is, the 30% for wants is where the flex lives. The saving slice is the one to protect.

The rule works less well at the bottom of the table, where £855 does not cover most people's rent, let alone their food. It works better as a direction than a target: if your essentials are above half of take-home, the only sustainable fix is to move one of them, and the table shows how much has to move.

The deductions you can actually change

Tax and National Insurance are set for you. But a few of the lines in the sum respond to decisions, and one of them gives you money back for making it.

1. 1Raise your pension contribution: it costs less than it addsBecause the contribution comes out before tax, it never costs the full amount. Going from 5% to 10% on £38,000 lowers take-home by £127 a month and puts £158 a month into the pension. On £60,000 the same move costs £150 and adds £250, because the extra is relieved at 40%. Your disposable income shrinks, but by less than the amount you have just saved.
2. 2Ask whether your employer runs salary sacrificeIn the standard net pay setup, £100 into your pension costs a basic-rate taxpayer £80 of take-home and a higher-rate taxpayer £60. Under salary sacrifice the £100 also escapes National Insurance, so it costs £72 and £58 respectively. Same pension, more disposable income. Many employers offer it and few people ask.
3. 3Between £100,000 and £125,140, the pension is a 60% savingSomeone on £110,000 moving their contribution from 5% to 9% loses £147 of monthly take-home and gains £367 of monthly pension, because the whole of the extra contribution sits in the taper band and buys back the personal allowance as well as saving 40% tax. Outside an employer match, nothing else in UK personal finance turns £1 of pay into £2.50 of savings.
4. 4Check you are on the right student loan planThe plans have different thresholds, and payroll goes by what your employer was told. On £38,000, Plan 2 takes £65 a month while Plan 5, with its £25,000 threshold, takes £98. If you have finished repaying, or were put on the wrong plan, HMRC has been taking money it will have to give back. Your online student loan account shows the plan and the balance.
5. 5Check your tax code, and claim Marriage Allowance if you canAn emergency or out-of-date tax code can cost hundreds a year until someone notices, and it is usually you. If you are married or in a civil partnership and one of you earns under the £12,570 personal allowance while the other pays basic-rate tax, Marriage Allowance transfers a tenth of it to the other and is worth about £252 a year. Small, but it is disposable income for the price of a form.

What it buys: the age you stop working

Disposable income is only interesting for what it can do. The most motivating thing it can do is bring forward the day work becomes optional.

Take someone aged 35 with £40,000 already in pensions, who wants £2,200 a month in retirement and whose State Pension starts at 68. Here is the age at which their savings would support that lifestyle to 95, depending on how much of their disposable income goes into a pension each month.

Read the table against the £38,000 example. Saving £300 of its £882 a month, with £582 still free to spend, moves the answer from "Not by 80" to 71. Saving £500 brings it to 66, and £800 to 62 - 6 years before the State Pension would arrive. The first few hundred pounds do the most work, because they are what turns a pot that never gets there into one that does; every £100 after that still buys years, just fewer of them.

That is the whole reason to know this number. The retirement age calculator runs the same sum for your own age, savings and spending, and the banner just below carries your disposable income straight into it. For the size of pot you are aiming at, how much you actually need to retire in the UK prices each lifestyle.

Three people, three answers

Same sum, three very different lives. What each of them has left is less about the salary than about the lines underneath it.

What this calculation deliberately leaves out

A payslip carries details no calculator can see. Hold the result as a close estimate and adjust for these.

• Scottish income tax. Scotland has its own bands and rates: a few pounds a month apart at lower salaries, and considerably more once Scotland's higher rate starts, which it does well below the £50,270 threshold elsewhere.
• Your tax code. Benefits in kind, underpaid tax from a previous year, or a second job all change it, and the sum above assumes the standard code.
• Salary sacrifice. If your pension, car or cycle scheme runs through sacrifice, National Insurance is charged on the reduced salary and your take-home is a little higher than shown.
• Bonuses and overtime. Taxed in the month they arrive, often at a higher marginal rate than your basic salary. Use your regular pay for the monthly sum and treat the rest as a windfall.
• The High Income Child Benefit Charge. Between £60,000 and £80,000 of income, Child Benefit is clawed back through a tax return or your tax code, a further deduction the payslip never shows. It is charged on income after pension contributions, so the pension lever above reduces it too.
• Self-employment. Different National Insurance, no employer contribution, and tax paid in arrears. The formula is the same but the lines are not.
• Irregular essentials. Annual insurance, car repairs, the boiler. Divide the yearly total by twelve and add it to essentials, or the monthly figure will flatter you.

How to check your own numbers

Frequently asked questions