PAYE explained: how income tax is actually taken from your wages

Guide · Updated 27 August 2026 · About 6 minutes

Almost every employee in Ireland pays income tax through PAYE — Pay As You Earn. The system is not complicated once you see its three moving parts: two tax rates, one threshold that decides which rate applies, and a set of credits that come off the bill at the end. This guide walks through each part with worked numbers.

1. What PAYE actually is

PAYE is not a separate tax. It is a collection method for income tax. Rather than sending you a bill once a year, Revenue asks your employer to calculate the tax due on each payment and hand it over directly. You receive what is left.

Three things are deducted from most Irish payslips, and only the first of them is income tax:

• PAYE — income tax on your earnings.
• PRSI — Pay Related Social Insurance, which builds your entitlement to social benefits. See our guide to PRSI.
• USC — the Universal Social Charge, a separate charge on gross income with its own bands. See our guide to USC.

People often describe all three together as "tax", which is why a payslip can feel like it has taken more than the headline rate suggests. They are calculated independently of one another, on slightly different amounts.

2. The two rates and the cut-off point

Ireland has a two-rate income tax system. A standard rate of 20% applies to income up to a threshold, and a higher rate of 40% applies to everything above it. That threshold is called the standard rate cut-off point.

The cut-off depends on your personal circumstances — whether you are single, married or in a civil partnership, whether you are jointly assessed, and whether one or both spouses have income. Irish Money Clock uses the single-person figures, and for 2026 it assumes a cut-off of €44,000.

3. Tax credits reduce the bill, not the income

Once the 20% and 40% calculation is done, tax credits are subtracted from the result. This is the step that trips people up, because credits do not reduce your taxable income — they reduce the tax itself, euro for euro.

Most employees hold at least two credits: a personal tax credit and an employee (PAYE) tax credit. Irish Money Clock assumes a combined €4,000 for a single employee. Other credits exist and are easy to miss, including:

• Single Person Child Carer Credit, if you care for a child on your own.
• Home Carer Credit, for a jointly assessed couple where one spouse cares for a dependent person.
• Rent Tax Credit, for tenants in private rented accommodation.
• Age Credit, Blind Person's Credit, Incapacitated Child Credit and the Dependent Relative Credit.
• Tuition fee relief, and medical expense relief at the standard rate.

Unclaimed credits are one of the most common reasons people quietly overpay tax for years. Revenue allows you to claim back overpayments for the four previous tax years, so it is worth reviewing your certificate rather than assuming the default is right for you.

4. A worked example, start to finish

Take a single employee on €52,000 a year, contributing 5% of salary to an occupational pension. Pension contributions within the age-related limits reduce income for PAYE purposes, so they come off before the rates are applied.

PRSI and USC are then charged separately, and both are calculated on the gross €52,000 rather than the reduced €49,400 — pension relief applies to income tax, not to PRSI or USC. That is why take-home pay falls further than the PAYE figure alone implies, and why the live clock shows all four deductions side by side.

5. Why your tax changes from month to month

PAYE is normally operated on a cumulative basis. At each pay date your employer looks at your total pay for the year to date, works out the total tax due on it, subtracts what you have already paid, and deducts the difference. The effects are worth knowing:

• Your credits and rate band are spread evenly across the year. A monthly payroll gets one twelfth of your cut-off point and credits each month.
• Unused allowances carry forward. If you were out of work or on reduced hours, the unused portion of your rate band is still available later in the year, which is why a return to full pay is sometimes taxed surprisingly lightly.
• A bonus can be taxed heavily. A one-off payment can exhaust the remaining standard rate band in a single period, so the balance is charged at 40% on the spot even though your annual average rate is much lower.

This is the main difference between a real payslip and any live calculator, including this one. Irish Money Clock annualises your current earning rate and applies a full year of credits proportionally — a smooth estimate of your steady-state position, not a reproduction of your employer's cumulative arithmetic on a specific date.

6. Week 1 basis and what it means for you

Sometimes Revenue instructs your employer to use the Week 1 basis (called Month 1 for monthly payrolls). Each period is then treated in isolation: you get that period's share of credits and rate band, and nothing carries forward or back.

It is usually applied where there is uncertainty about your circumstances — a change of job mid-year, a second employment starting, or a large adjustment that would otherwise cause a big one-off refund or bill. It is not a penalty, but it can mean you pay more than necessary for a while. Once Revenue has complete information, the basis reverts to cumulative and any overpayment is refunded through payroll or in your end-of-year statement of liability.

7. Four things worth checking today

1. Your tax credit certificate. Sign in to Revenue myAccount and confirm your credits and rate band are allocated to your current employer.
2. Old employments. If a previous job is still listed as active, part of your rate band may be sitting where it cannot be used.
3. Credits you never claimed. Rent, medical expenses and tuition fees are all commonly missed, and can be claimed for four prior years.
4. Your basis of assessment. If your payslip says Week 1 or Month 1, find out why — it often signals missing information at Revenue.

Frequently asked questions