Net to Gross Salary Calculator UK

Most salary calculators answer the question "if I earn £X, what do I take home?" This one answers the reverse: "if I need to take home £X, what salary do I need to ask for?" It sounds like the same question flipped around, but the maths is genuinely trickier, and it's the version that matters most in salary negotiations, contractor rate discussions, and household budgeting.

This calculator works backwards from your target take-home pay to the gross salary required, using 2026/27 tax year rates (6 April 2026 to 5 April 2027).

Why you can't just add a percentage back on

If tax were a single flat rate, converting net to gross would be simple division. But UK Income Tax works in bands, and National Insurance has its own separate thresholds, so your effective tax rate changes as your income rises. The bands for 2026/27:

Employee National Insurance runs on its own scale: 8% on earnings between £242 and £967 a week (£1,048 to £4,189 a month), then 2% above that. Because the two systems use different thresholds and change rates at different points, each extra pound of gross salary delivers a different amount of net pay depending on where you sit. The calculator solves this by working through the bands iteratively until it finds the gross figure that produces your target net. For a plain-language primer, see our net pay vs gross pay guide.

Rough reference points

As a sense-check for 2026/27, assuming a standard 1257L tax code and no other deductions:

• A take-home of around £2,000 a month needs a gross salary of roughly £28,500
• A take-home of around £2,500 a month needs roughly £36,800
• A take-home of around £3,000 a month needs roughly £45,300
• A take-home of around £4,000 a month needs roughly £64,600, noticeably more per net pound, because much of the extra falls into the 40% band

Notice how the gap widens as the target rises. Going from £3,000 to £4,000 of monthly take-home requires far more additional gross salary than going from £2,000 to £3,000, because higher-rate tax eats a bigger share of each marginal pound.

The £100,000 trap

If your target take-home implies a gross salary above £100,000, be aware of the Personal Allowance taper: you lose £1 of allowance for every £2 earned above £100,000, until it disappears entirely at £125,140. Within that band, the effective marginal tax rate is 60% (plus 2% NI), which dramatically increases the gross needed for each extra pound of net pay. Pension contributions via salary sacrifice are a common way to manage this.

What this calculator doesn't include

The result assumes a standard tax code and no deductions beyond Income Tax and employee National Insurance. In reality, your required gross figure will be higher if you have:

• Pension contributions — auto-enrolment typically takes 5% of qualifying earnings from your side
• Student loan repayments — 9% of income above your plan's threshold (6% for postgraduate loans)
• Benefits in kind — a company car or medical insurance adjusts your tax code and reduces net pay
• A non-standard tax code — anything other than 1257L changes the calculation

Treat the output as a solid starting point for negotiation, then refine it for your specific deductions.

Using this in a salary negotiation

Working backwards from your required take-home is a genuinely useful negotiation technique. Instead of anchoring on a gross figure that sounds respectable, start with what your life actually costs, rent or mortgage, bills, savings goals, then add your deductions to find the gross number that delivers it. It turns "I'd like £45,000" into "I need £45,000 for this to work", which is a stronger position, and it stops you accidentally accepting an offer that sounds bigger than it lives.

Scotland

This calculator uses rest-of-UK bands. Scottish Income Tax has more bands at different rates, so the gross figure needed for the same take-home differs for Scottish taxpayers, generally slightly more at middle and higher incomes.

This is a general estimate, not financial advice. For a precise figure around a job offer or contract, factor in your pension, student loan and tax code, or run it past an accountant.