What does the pro rata salary calculator do?
It routes a specific salary question into PayBreakdown's calculator so gross pay, take-home pay, tax, National Insurance, pension, student loan, region, and tax-code assumptions can be adjusted.
PayBreakdown - Salary Calculator & Budget Manager
Pro rata salary calculator
Estimate pro rata salary and take-home pay for reduced hours, part-time work, furlough-style comparisons, and changed working patterns.
What this page helps with
Pro rata salary searches are often about changing hours or comparing a full-time salary with a reduced working pattern. PayBreakdown links this intent to pro-rata and salary tools.
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 ratesFrequently asked questions
Can I change the assumptions?
Yes. Open the calculator from this page to change salary, hours, pension, student loan, tax year, region, tax code, bonus, and other pay settings.
Last updated 2026-05-07. Planning estimates only. Not financial advice.