HMRC Tax Basics Every Expat Should Know (2026)

Moving to the UK means entering one of the more straightforward tax systems in the world for employees — most people never file anything at all, since tax is deducted automatically from your paycheck. But there are important exceptions, and knowing which category you fall into avoids surprise bills later. Here's the 2026 picture.

Author: LifeWestWay Research Team · Last updated: July 2026 · Official sources: GOV.UK Income Tax rates and Self Assessment registration guidance from HMRC.

How Most People Pay Tax: PAYE

If you're employed, your Income Tax and National Insurance are collected automatically through the PAYE (Pay As You Earn) system — your employer deducts tax directly from your salary before you're paid. For the majority of employees, this means you never need to file a tax return at all.

The 2026/27 Tax Year and Key Numbers

The UK tax year runs from 6 April to 5 April the following year — so the 2026/27 tax year runs from 6 April 2026 to 5 April 2027. Key figures, most of which have been frozen since 2021–2022:

• Personal Allowance: £12,570 — the amount you can earn before paying any Income Tax at all (this shrinks if your income exceeds £100,000, and disappears entirely above £125,140).
• Basic rate threshold: £50,270.
• Higher rate threshold: £125,140.
• Dividend allowance: £500.

Because these thresholds have stayed frozen for several years while wages have risen, more people are being pulled into higher tax brackets each year — a phenomenon often called "fiscal drag."

Expert Insight

With frozen tax thresholds causing fiscal drag across the UK, an estimated 3 million additional taxpayers have been pulled into higher-rate brackets over the past few years, making tax code monitoring via your Personal Tax Account crucial.

Income Tax Bands (England, Wales & Northern Ireland)

• 0% on income up to £12,570 (Personal Allowance).
• 20% (basic rate) from £12,571 to £50,270.
• 40% (higher rate) from £50,271 to £125,140.
• 45% (additional rate) above £125,140.

Scotland has its own bands, set separately by the Scottish Parliament, with more gradual steps — so if you're resident in Scotland, don't rely on the rates above for your non-savings, non-dividend income.

When You Actually Need to File Self Assessment

Most PAYE employees never need to file, but you must register for Self Assessment if any of the following apply:

• You're self-employed or run a business, even part-time.
• You have foreign income, or income complex enough that PAYE can't tax it accurately.
• You received savings, investment, or dividend income above the relevant allowances.
• You or your partner received Child Benefit and either of you earned more than £60,000 (the High Income Child Benefit Charge threshold).
• You have UK rental income.

If you're unsure whether you need to register, HMRC's own online tool can confirm your position in a few minutes — it's worth checking rather than assuming PAYE has caught everything.

Self Assessment Key Dates for 2025/26 Returns

• 6 April 2026: Earliest date you can start filing your 2025/26 return.
• 5 October 2026: Deadline to tell HMRC if you need to file for the first time.
• 31 October 2026: Paper return deadline.
• 31 January 2027: Online filing deadline and balancing payment deadline.

Filing on time — even if you can't pay the full bill immediately — is always the better option, since late filing penalties accumulate quickly regardless of whether you owe anything.

National Insurance for the Self-Employed

If you're self-employed, you pay Class 4 National Insurance contributions on profits between the lower and upper profits limits, calculated automatically when you file your Self Assessment return. Class 2 contributions were abolished in April 2024, so self-employed workers no longer pay that separate flat weekly charge.

New Residents: The Foreign Income and Gains (FIG) Regime

In 2025, the UK replaced the old "non-dom" remittance basis rules with a new Foreign Income and Gains (FIG) regime. New UK residents who were non-resident for the previous 10 tax years may qualify for a 4-year exemption on certain foreign income and gains. However, opting into this regime means giving up your Personal Allowance (£12,570) and Capital Gains Tax exemption (£3,000), so it's not automatically beneficial — most people should run the numbers both ways before choosing.

Why This Matters in 2026

With HMRC increasing its digital integration and automated data-sharing across international banking networks under the Common Reporting Standard (CRS), offshore or foreign income omissions are detected faster than ever, making precise compliance essential for new arrivals.

Practical Tips for New Arrivals

• Register for a Personal Tax Account at gov.uk to check what HMRC already knows about your income and tax position.
• Watch the £100,000 taper — if your income creeps above this level, your Personal Allowance starts shrinking, effectively creating a higher marginal tax rate in that band.
• Track side income carefully — HMRC combines income from multiple jobs or gig work for the purposes of higher-rate triggers, and unreported secondary income is a common source of unexpected tax bills.
• Keep records of both UK and foreign income if you're recently arrived, since your residency status and any treaty relief will depend on accurate documentation.

Application Checklist

• Confirm whether your income is fully covered by PAYE or whether you need to register for Self Assessment.
• Check whether the £100,000 Personal Allowance taper applies to you.
• Register for Self Assessment by 5 October if this is your first year needing to file.
• Understand whether the new Foreign Income and Gains regime could benefit your situation.
• Keep documentation of any foreign income and prior tax residency.
• File by 31 January even if you can't pay in full immediately, to avoid late filing penalties.

Disclaimer: This article is for general informational purposes only and does not constitute tax advice. UK tax rules and thresholds are reviewed regularly — always verify current figures on GOV.UK or consult a qualified accountant.