Preparing for the new tax year 2026: key dates and checks

Introduction: Why the new tax year 2026 matters

The new tax year 2026, which begins on 6 April, marks the annual reset point for UK income tax, National Insurance reporting, allowances, and filing cycles. For individuals, businesses and advisers it governs when allowances restart, when pensions and ISA subscriptions refresh, and when year‑end returns and payroll reconciliations are due. Early preparation reduces the risk of mistakes, unexpected liabilities or missed reliefs.

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Key dates and deadlines

The new tax year starts on 6 April 2026 and the tax year ends on 5 April 2027. Self‑assessment deadlines remain important: paper returns are due by 31 October after the tax year, while online returns are due by 31 January following the tax year (so taxpayers should note the online deadline after 5 April 2027). Employers must complete their payroll year‑end processes and provide employees with necessary documentation, such as P60s, in line with HMRC requirements.

What individuals should check

Review your tax code, PAYE notices and any student loan or benefits attachments to earnings; incorrect codes can lead to under‑ or over‑payment. Check your ISA and pension contribution plans so you can use fresh annual allowances once the new tax year opens. If you expect changes in income — for example from employment, rental income, dividends or capital gains — consider whether steps such as adjusting PAYE coding, making voluntary pension contributions or timing disposals could be beneficial, and consult a tax professional if unsure.

What businesses and employers should do

Employers should confirm payroll software updates reflect any announced changes to rates or thresholds and communicate with staff about payslip or benefits changes. Businesses with obligations under VAT, corporation tax or PAYE should schedule year‑end reconciliations and speak to their accountants about cash‑flow and provisional tax liabilities. Companies must also watch for any policy announcements from HM Treasury that could affect reporting or liability in 2026–27.

Where to get authoritative information

HMRC and HM Treasury publish official guidance and updates; check their websites for confirmed changes and policy announcements. Professional advisers can provide personalised advice tailored to individual or business circumstances.

Conclusion

The new tax year 2026 is an annual milestone with practical implications for planning, reporting and cash‑flow. Early checks — on tax codes, filings, contribution plans and payroll systems — help avoid surprises. Monitor official HMRC guidance and, where needed, consult a qualified adviser to ensure you are tax‑efficient and compliant as the year begins.