Why is my tax so high?

If your take-home pay is lower than expected, the cause is usually somewhere on your payslip: PAYE, USC, PRSI, pension deductions, emergency tax or missing credits.

Written by: Money Made Clear
Type: General information
Sources: Revenue
Last checked: 28 May 2026
Not advice: General information only

General information only, based on official public sources. Not financial, tax, legal or welfare advice.

Reviewed against Revenue, WRC and DSP guidance · Last updated May 2026

Quick answer: High tax is often caused by emergency tax, missing or split tax credits, a second job, a bonus/overtime payment, pension deductions, or confusing PAYE with USC and PRSI.

Common reasons your deductions look high

Reason	Where to check
Emergency tax	Your job may not be registered correctly with Revenue yet.
Missing tax credits	Your Tax Credit Certificate may not show all credits that apply to your circumstances.
Second job	Your credits and rate band may be split between employments.
USC and PRSI	These are separate from PAYE and can make total deductions look bigger.
Pension or benefit deductions	Pension, health insurance or other agreed deductions can reduce net pay.
Bonus or overtime	A higher pay period can push more income into higher tax/USC bands for that period.

Start with your payslip

Look at whether the deduction is PAYE, USC, PRSI, pension or something else. Payslips generally itemise deductions, so do not treat the total deduction as one single “tax” number.

Source: WRC — Payslips

Check Revenue myAccount

If PAYE looks too high, check your job, tax credits and Tax Credit Certificate in Revenue myAccount. Revenue payroll details are what your employer uses to calculate PAYE and USC.

Source: Revenue — Tax Credit Certificate

Could it be emergency tax?

Emergency tax usually happens when Revenue does not yet have the correct information about your employment. Once corrected, overpaid PAYE is often refunded through payroll.

Source: Revenue — Emergency Tax

Read the full guide: Emergency Tax Explained.

Could it be USC or PRSI?

PAYE is only one deduction. USC and PRSI are separate deductions with different rules. If you add them together, your total deductions can look much higher than your income tax alone.

What this means in real life

For an employee, a higher-than-usual deduction is often explained by a change in payroll information rather than one single tax rate. A first or new job may be on emergency tax, tax credits may be allocated elsewhere, or a week 1 basis may prevent earlier unused credits from being applied. Overtime, bonuses or a second job can also move part of income into a higher PAYE, USC or PRSI calculation. The practical starting point is to separate the lines on the payslip instead of treating every deduction as income tax. The payslip guide explains those lines, and Emergency Tax explained covers one common cause. Revenue records and payroll information determine the actual calculation.

Related guides

Official sources

For current rules, rates and eligibility, check the relevant official public source.