Route 1
Take-home pay and pay rises
Best for the classic "why does my raise feel smaller than it should?" question.
Pick the salary question first
Route 2
Thresholds and hidden cliffs
Best if the real issue is adjusted net income, Child Benefit clawback or another threshold that changes the maths.
Route 3
Payroll quirks and benefits
Best for emergency tax, second jobs, company cars and the parts of employment that feel like admin but cost real money.
High-value calculators
Core
Tax Drag Calculator
Start here for the full annual picture of pay, tax, NI and loan drag.
Incremental
Bonus / Pay Rise
See what the next raise, overtime block or one-off payment really leaves you with.
Threshold
Adjusted Net Income
Work out the number behind Child Benefit, childcare and Personal Allowance tapering.
Payroll
Emergency Tax Checker
Check new-job, first-pay and temporary-code overpayments.
Benefit
Company Car Tax
Compare EV, hybrid and combustion-car benefit-in-kind costs.
Household
Marriage Allowance
Check whether a couple-level allowance transfer saves tax.
Useful explainers and update pages
FAQ
Why is my tax code BR?
The quick answer when a second job or missing allowance starts to distort pay.
FAQ
What is an emergency tax code?
Short explanation of W1, M1, X and cumulative versus non-cumulative treatment.
Update
Current Tax-Year Updates
Use this when you want the pages that are worth revisiting through the year.