UK PAYE and tax code specialists
Is HMRC charging you the right amount of tax?
Nearly one in three UK taxpayers are on the wrong tax code. TaxChecker lets you check your own PAYE position in minutes, catch any overpayments, and see exactly what to claim back. Fully private. Nothing shared with HMRC, nothing shown to anyone but you.
What we check
Every corner of your PAYE position, reviewed in one place
Our engine mirrors HMRC's own calculations, then compares them against your payslip, tax code, and employment history to surface anything that looks off.
Tax Code Check
Decode every letter and number in your tax code. We flag outdated codes, emergency codes, and deductions you may not know you are paying.
PAYE Calculator
See exactly how HMRC arrives at your take-home pay, with a breakdown of income tax, National Insurance, and pension contributions.
P800 Refund Check
Find out whether HMRC owes you money from previous tax years. We mirror the P800 end-of-year calculation so you know exactly what to claim.
Payslip Analysis
Drop in a payslip and the calculator pulls out the numbers, verifies each deduction, and explains anything that looks unusual in plain English. The file stays in your session and is discarded on exit.
Take-Home Forecasting
Model a pay rise, a new job, or a pension change before you commit. See the impact on your net pay to the nearest pound.
HMRC Change Monitor
We track HMRC rate changes, allowance updates, and code notices so you hear about anything that affects your pay before your employer does.
How it works
Three steps, fully private, no one else sees your numbers
No account, no data sharing, no HMRC notification. What you enter is for your eyes only.
Enter only what you want to check
Type in your tax code, salary, and pension figures. They stay inside your session. We never send anything to HMRC, we never share data with third parties, and nothing is kept once you close the page unless you explicitly ask us to save a profile.
The numbers are crunched privately
Our calculator mirrors HMRC's own PAYE and tax code logic, then runs against the figures you entered. No one reviews the results. Not our team, not HMRC, not anyone else. There is no human in the loop.
Only you see the result
You get a clear, private breakdown of what you owe, what you may be owed, and exactly what to do next. If you want to claim a refund, we draft a ready-to-send letter for you to submit to HMRC yourself. We never contact HMRC on your behalf.
About TaxChecker
Built by people who have fought HMRC on their own tax code, and won.
TaxChecker exists because the UK tax system is unnecessarily opaque. Most people cannot tell from their payslip whether they are paying the right amount, let alone reclaim what they are owed.
We built a calculator that mirrors HMRC's own numbers, pulls the detail from your payslip inside your own session, and explains every deduction in plain English. No account. No data sharing. No HMRC notification. To mark the launch, the first 50 sign-ups get full access at no cost, for life.
Frequently asked
Straight answers to the questions we hear most
Is TaxChecker affiliated with HMRC?
How much does TaxChecker cost?
How secure is my information?
Can TaxChecker file a refund on my behalf?
Which tax year does TaxChecker support?
Do you provide regulated tax advice?
Contact
Get in touch
Questions, feedback, or a tax situation that does not fit the calculator? Send us a message and we will reply within one working day.