## Start with three numbers only
Ignore bonus footnotes for a minute. Find gross for the period, total deductions, and net paid. If those three do not reconcile (gross − deductions ≈ net), stop and fix the period (weekly vs monthly vs YTD) before opening any calculator.
## What calculators usually miss
Salary sacrifice, union dues, court orders, benefits in kind, and mid-year tax code changes rarely sit in a simple progressive model. Treat Net salary as a baseline, then add those lines from the payslip by hand.
## A 10-minute check that actually helps
1) Enter payslip gross into Net salary. 2) Compare tax + social to Payroll deductions and Income tax. 3) If the gap is >2–3%, list the missing lines — do not “force” the model to match by inventing rates. Educational only for United Kingdom.
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Note: Educational content from Calcly United Kingdom. Official sources (HMRC — PAYE/NI simplified annual model.) and licensed professionals take priority in United Kingdom.