PayBreakdown - Salary Calculator & Budget Manager
Why does a salary calculator differ from my payslip?
Payslips can differ from calculator estimates because of timing, tax code changes, pension method, student loans, benefits, arrears, bonuses, or payroll adjustments.
What this page helps with
A calculator estimate is only as good as the assumptions entered. Real payslips can include year-to-date PAYE corrections, benefits, one-off payments, pension method differences, student loan notices, and employer-specific payroll rules.
Official sources
Income Tax rates and Personal AllowancesNational Insurance rates and categoriesStudent loan repayment thresholdsPension tax reliefNational Minimum Wage and National Living Wage ratesStatutory Maternity Pay and LeaveStatutory Sick PayFCA guidance on misleading financial promotionsOff-payroll working and IR35 guidanceUnderstanding off-payroll workingSalary sacrifice for employersNHS Employers pay scales 2026/27NHS Health Careers Agenda for Change pay ratesLast updated 2026-05-07. Planning estimates only. Not financial advice.