attoh.tech · Free tool

Free UK PAYE & NI Calculator 2026/27

Income tax, National Insurance, pension and take-home — the same HMRC-reconciled engine behind payroll.law.

Run real payroll, not just sums

This free calculator runs the same 539-vector, HMRC-reconciled engine behind payroll.law — the UK SME PEO that files RTI and pays your staff for you.

See payroll.law