What happens at the end of the UK tax year?

The 6 April flip

The UK tax year runs 6 April to 5 April. Blankitt HR's engine derives the tax year from the payment date on a pay run — not the period dates — because PAYE/NI are due on the payment.

What changes automatically

• YTD totals reset — a new run with payment_date >= 6 April starts fresh YTDs
• New rate tables — the engine swaps to the new year's rate tables (or whichever is current) at the boundary
• Tax code carryover — existing employee tax codes carry forward; HMRC issues annual coding notices in March that you should apply before April runs
• Personal allowance — starts again

What you need to do

• Apply HMRC coding notices for the new year (Settings > HMRC notices, when supported — for now: per-employee tax-code update)
• File P60s to employees who were employed on 5 April (P60 generation is on the roadmap)
• Check pension contribution settings against the new LEL/UEL band (statutory rates change annually)

Mid-year hires

A new employee starting mid-year typically arrives with a P45 from their previous employer. From the P45 you set:

• Tax code (cumulative, often 1257L)
• Previous taxable + tax paid YTD (creates the YTD opening row)

Without a P45, use a starter declaration (A / B / C) and HMRC's emergency code 1257L W1 until a P45 or coding notice arrives.