Optimize your UK PAYE take-home
One salary input — five optimization levers. Tax code, take-home, salary sacrifice, savings tax, and fiscal drag context. All updated for tax year 2026-27 with Scotland bands and HICBC built in.
Frequently asked questions
What's the most efficient single change to my UK take-home pay?
For most PAYE earners, increasing pension via salary sacrifice is the highest-ROI single change because it saves both income tax (20-47%) and 2% employee NI on the sacrificed amount. Basic-rate workers save 22%, higher-rate 42%, additional-rate 47%, and £100k-£125k earners save 62% (E&W) due to the personal allowance taper.
How does my tax code affect my take-home?
Your tax code controls how much personal allowance is applied through PAYE each pay period. The standard 1257L code gives £12,570 of tax-free pay per year. Suffix letters (M, N, T, NT) flag specific situations; week-1/month-1 codes apply emergency basis. An incorrect code can over-tax you by hundreds per month.
Why is salary sacrifice better than personal pension contributions?
Salary sacrifice reduces your gross pay before income tax and NI, saving both. Personal pension contributions only get tax relief — typically the 20% basic-rate gross-up automatically, with higher/additional rate relief claimed via Self Assessment. NI is not recovered. Sal-sac saves an extra 2% of NI plus any employer NI savings if your employer passes them through.
Should I prioritise pension over ISA for tax efficiency?
Pension wins on the way in — you avoid income tax + NI on contributions. ISAs win on the way out — withdrawals are tax-free, while 75% of pension withdrawals are taxable income. For most PAYE earners under 55, pension contributions via salary sacrifice are the most tax-efficient allocation, especially with employer match. Use ISA for medium-term savings you'll access before age 55.
What's the £100k tax trap and how do I escape it?
Income between £100,000 and £125,140 has the personal allowance gradually withdrawn, creating a 62% effective marginal rate (40% IT + 20% PA-loss + 2% NI). Pension salary sacrifice is the standard escape: sacrifice enough to bring taxable income to £100,000 and the trap disappears. See our £100k Tax Trap Calculator for specifics.
How does fiscal drag affect my real take-home?
The personal allowance, higher-rate threshold and additional-rate threshold are frozen through April 2028. As wages rise with inflation but thresholds don't, more of your income falls into higher bands. A worker earning £45,000 in 2021 who has tracked CPI now pays significantly more income tax in real terms despite no real-pay rise.
Are savings interest taxed differently from salary?
Yes. The Personal Savings Allowance gives basic-rate taxpayers £1,000 of tax-free savings interest, higher-rate £500, and additional-rate £0. Below the personal allowance, the £5,000 starting rate for savings can apply. Anything above is taxed at your marginal rate.
Does this work the same way in Scotland?
Mostly yes — personal allowance, NI, and pension rules are UK-wide. Income tax bands differ: Scotland has 6 bands (starter, basic, intermediate, higher, advanced, top) versus 3 in E&W. Marginal rate calculations adjust automatically when you select Scotland.
Component calculators used in this flow
- Tax Code Checker — verify your PAYE code
- Take-Home Pay Calculator — full breakdown including student loan
- Salary Sacrifice Calculator — pension + EV + cycle-to-work + employer match
- £100k Tax Trap Calculator — focused 60% trap navigator
- Savings & Dividend Allowance Optimiser — full PSA + dividend allowance interaction
- Inflation & Fiscal Drag Calculator — long-view CPI projection
Reviewed April 2026 · 2026-27 rates default · Scotland bands and HICBC built in
Related Calculators
Salary Sacrifice Calculator
Tax and NI savings from pension, EV, and cycle-to-work sacrifice.
£100k Tax Trap Calculator
Navigate the £100,000–£125,140 zone where the personal allowance tapers and marginal tax hits 62% (E&W) or 69.5% (Scotland).
Pension Tax Relief Calculator
Annual Allowance, tapered allowance, and carry forward.
Learn More
Salary Sacrifice Pension: Save £1,000s on Tax and NI
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The £100,000–£125,140 Personal Allowance Trap: How to Escape the 60% Tax Rate
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Frozen Tax Thresholds and Fiscal Drag 2026-27 — How the UK's Stealth Tax Works
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