Tax refund estimator
Check if you may have overpaid Income Tax
This tool helps PAYE users estimate whether the Income Tax already paid looks higher, lower, or roughly in line with the estimated tax due.
Current tax-year framing
This feature is built as a first-check PAYE estimator using TaxDecod's current 2025/26 site assumptions. It works best when users know their gross income, tax code, and tax already paid.
Using 2025/26 site assumptions
PAYE Income Tax estimate only
Best with P60 or payslip tax paid
HMRC decides final refund or underpayment
What this tool is for
PAYE refund / underpayment check
Check if your Income Tax looks too high or too low
This estimator compares the Income Tax you have already paid with the estimated Income Tax due based on your salary, tax code, and current TaxDecod assumptions.
Best input
P60 or tax paid to date
Focus
Income Tax only
Step 1
Enter your tax and salary details
Use your completed-year figures or your payslip tax-paid-to-date figures for a rough current-year check.
Step 2
Read the refund / underpayment signal
This compares your paid Income Tax against the estimated Income Tax due for the selected reference period.
Refund reading
£1,186
possible underpayment signal
You may have underpaid Income Tax
Based on this paye employment estimate, the Income Tax already paid looks lower than the estimated tax due for the full tax year.
Expected tax (full tax year)
£5,486
Tax already paid
£4,300
Estimated annual tax due
£5,486
Confidence
Stronger estimate when using a completed-year salary and total tax paid
This is an estimator, not an HMRC decision. It is most useful as a first check before a user looks at their P60, payslip tax paid, P800 letter, or HMRC account.
Open calculator
Check your full take-home pay and deduction mix.
Compare salaries
See whether another salary changes your monthly outcome.
Reverse from take-home
Work backwards from the monthly income you want to keep.
Best inputs
- P60 total tax paid
- Payslip year-to-date tax paid
- Correct tax code
- Expected full-year gross income
Understand tax code and PAYE
Helpful when a refund signal may be caused by the wrong code or a payroll mismatch.
Check your salary normally
Move back into the full salary reading if you want the broader net-pay picture.
Explore salary pages
Browse common UK salary levels and related take-home routes.
Follow-up and saving
Send your refund estimate to your email
Save the refund or underpayment reading so you can compare it with a payslip, P60, or another salary scenario later.
For now, the most reliable way to keep this result is to save the route where available, bookmark the page, or return through the same salary path later. This keeps the experience calm and avoids promising a delivery step that is not central to the product.
Better next steps