Welsh rates · multiple tax years
Income Tax Calculator for Wales
Estimate Income Tax on employment income, taxable benefits and other non-savings income using the Welsh bands and Personal Allowance for your selected tax year.
Enter annual figures for the whole tax year. The calculation shows the allowance used, taxable income, each tax band and any estimated balance after PAYE tax already deducted.
Annual Welsh Income Tax estimate
Calculate Income Tax for the selected tax year
Use taxable annual amounts—not business turnover or gross rental receipts. Enter zero where a field does not apply.
- Personal Allowance available
- £12,570.00
- Taxable income
- £37,430.00
- Adjusted net income
- £50,000.00
- Average Income Tax rate
- 14.97%
- Effective marginal rate
- 20%
- Income after Income Tax
- £42,514.00
Tax band breakdown
Your adjusted net income is above £100,000, so the standard Personal Allowance has been reduced. This can produce an effective 60% marginal Income Tax rate across the taper range.
Estimate only. PAYE tax codes, deductions and reliefs can make the amount shown on a payslip or HMRC calculation different.
Direct answer
How much Income Tax will I pay in Wales?
The answer depends on the tax year, total non-savings income, the Personal Allowance available and how taxable income crosses the Welsh basic, higher and additional-rate bands. Select the relevant year before relying on the estimate.
The calculator applies the rates stored for that year and updates the allowance, band breakdown and result together. National Insurance, pension deductions and student loans remain separate.
Check Welsh Income Tax rates on GOV.UK →Rates and method
How the Welsh Income Tax calculation works
The calculator follows the order below. Each band is applied only to the part of taxable income that falls within it.
Add taxable income
Employment or pension income, taxable benefits and other entered non-savings income are combined.
Work out adjusted net income
Entered gross relief-at-source pension contributions and gross Gift Aid are deducted for this estimate.
Apply the Personal Allowance
The standard £12,570 allowance is reduced by £1 for every £2 of adjusted net income above £100,000.
Apply Welsh tax bands
Taxable income is allocated to the 20%, 40% and 45% bands, with qualifying gross contributions extending the relevant limits.
| Band | Taxable amount or threshold | Rate |
|---|---|---|
| Personal Allowance | Up to £12,570 | 0% |
| Basic rate | First £37,700 of taxable income | 20% |
| Higher rate | Above £37,700 to the additional-rate threshold | 40% |
| Additional rate | Above £125,140 of taxable income | 45% |
Sources: Income Tax in Wales and HMRC current and previous rates. Rates reviewed 4 September 2026.
Income above £100,000
The Personal Allowance taper changes the result
Adjusted net income—not simply salary—determines whether the allowance is reduced. Between £100,000 and £125,140, each additional £2 of adjusted net income removes £1 of Personal Allowance.
- Adjusted net income
- £100,000 £12,570 standard allowance
- Adjusted net income
- £110,000 £7,570 estimated allowance
- Adjusted net income
- £125,140+ No Personal Allowance
Qualifying pension contributions and Gift Aid can affect adjusted net income, but contribution limits, earnings requirements and claim conditions still need to be checked. See HMRC’s adjusted net income guidance.
Worked annual estimates
How income moves through the Welsh tax bands
The selected year controls the exact thresholds. These examples explain the calculation pattern without tying the page to one year.
The available Personal Allowance covers the entered income.
Tax is charged only after the available Personal Allowance is used.
Only the part above the selected year’s basic-rate limit is charged at the higher rate.
The Personal Allowance reduces before the tax bands are applied.
The calculator separates the taxable income placed in each band.
PAYE entered changes the estimated balance, not the underlying liability.
Know what the figure covers
What this Income Tax calculator includes—and what it leaves out
A clear boundary is more useful than a figure that quietly mixes different taxes and assumptions.
Included
- Welsh non-savings, non-dividend Income Tax rates
- Every tax year listed in the calculator’s annual rules table
- Standard Personal Allowance and income taper
- Gross relief-at-source pension and Gift Aid adjustments
- Estimated balance after tax already deducted
Not included
- National Insurance and student loan deductions
- Dividend and savings-income tax rules
- Capital Gains Tax or High Income Child Benefit Charge
- Marriage, Blind Person’s or trading/property allowances
- Scottish rates, PAYE tax codes or payroll-period calculations
From estimate to checked figure
Use the right annual figures before relying on the result
For PAYE income, start with the taxable pay and tax deducted on the relevant P60 or final payslip. Add taxable benefits and other income belonging to the same tax year. Self-employed users should enter taxable profit after allowable expenses, not sales.
If the result is for a return, the income sources need to be reconciled before the liability is treated as final.
Taxable employment pay and PAYE tax deducted.
Taxable employment benefits not already included in pay.
Taxable business or property profit after the correct deductions.
Gross qualifying amounts for the same tax year.
A calculator cannot read the records
When an Income Tax estimate should be checked
Ask for a review if more than one income source is involved, your adjusted net income is near £100,000, HMRC has changed your tax code, the PAYE figures do not reconcile or the result will be used in a Self Assessment return.
Common calculation questions
Income Tax Calculator questions
Does the calculator use Welsh Income Tax rates?
Yes. It uses the Welsh rates stored for the tax year you select. A Welsh taxpayer will normally have a tax code beginning with “C”.
Does it calculate National Insurance?
No. National Insurance is a separate calculation with employment status, earnings periods, thresholds and categories of its own. The income-after-tax figure shown here deducts Income Tax only.
Why should I enter annual income rather than monthly pay?
Income Tax liability is established for the tax year. Annual taxable figures reduce errors caused by irregular bonuses, job changes, cumulative PAYE codes and months with different pay.
What happens when income exceeds £100,000?
The standard Personal Allowance reduces by £1 for every £2 that adjusted net income exceeds £100,000. It is fully withdrawn when adjusted net income reaches £125,140.
Should I enter net or gross pension contributions?
This field is specifically for the gross value of contributions receiving relief at source. If you paid £800 and the pension provider added £200, the gross amount is £1,000. Do not enter contributions already deducted from pay before Income Tax.
Can I use the result in my Self Assessment return?
Use it to sense-check a position, not as a substitute for the return calculation. Savings, dividends, losses, reliefs, allowances, charges and tax already collected elsewhere can change the final liability.
Why can this differ from my payslip?
PAYE operates through a tax code and pay periods. Codes can include benefits, earlier underpayments, transferred allowances or other adjustments that this annual calculator does not reproduce.
Confidential enquiry
Need the Income Tax result checked?
Tell us the tax year, income sources and what does not look right. Do not include a National Insurance number, Unique Taxpayer Reference or bank details.
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