Kalcify

Free calculators · rates dated 2026/27

Every number,
shown working.

Simple, accurate tools for everyday life. No signup required. Each calculator cites its sources, shows the breakdown, and states the year its rates come from.

Browse ToolsHow we keep numbers right →
Live · UK take-home pay2026/27
Gross salary
£35,000
Income Tax
−£4,486
National Insurance
−£1,794
Take-home pay£28,720£2,393 per month · 2026/27
How your salary fills the tax bands
  • Personal Allowance£12,570
  • Basic Rate£22,430
Open the full calculator — student loans, pensions, Scotland →

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UK payroll & tax · 2026/27

One connected set of payroll calculators

View the UK guide →

UK Salary Calculator

Take-home pay after Income Tax, National Insurance, pension and student loan.Employee

Salary Sacrifice Calculator

Compare take-home pay and pension contributions before and after salary sacrifice.Employee

Pro Rata Salary Calculator

Convert a full-time salary into part-time pay from contracted hours or days.Employee

Two Jobs Tax Calculator

See how two employments share allowances while National Insurance stays separate.Employee

Employer NI Calculator

Estimate secondary Class 1 National Insurance and total employment cost.Employer

Maternity Pay Calculator

Build a week-by-week Statutory Maternity Pay schedule for 2026/27.Employer

Redundancy Calculator

Estimate statutory redundancy pay from age, service and capped weekly pay.Employer

Holiday Entitlement Calculator UK

Pro-rate statutory or contract holiday from exact start and leaving dates.Employer

Self-Employed Tax Calculator

Estimate Income Tax, Class 4 NI and payments on account from annual profit.Self-employed

Inside IR35 Calculator

Compare deemed-employment and outside-IR35 take-home from one contract.Contractor

Notes to the numbers

Note 01 — Sources, linked

Rates and thresholds link to the government or standards body they come from — HMRC, NHS, IRS — at the point where the number is used.

Note 02 — Dated, not vague

Every calculator states the tax year or data year it uses, so you know exactly what you are looking at.

Note 03 — Workings shown

Results come as a full breakdown you can check against your own payslip or bill — see the methodology.