Tax credits: why PAYE can differ for the same salary

This page explains how tax credits affect PAYE and why they usually do not change USC or PRSI. It is scenario guidance for 2026.

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Practical summary

Credits reduce PAYE (income tax).
Credits usually do not reduce USC or PRSI.
Different credits can create different PAYE outcomes at the same gross salary.

How to model scenarios

Run the base salary scenario.
Adjust additional credits in Advanced inputs and compare net pay.
If you have multiple jobs, compare a “credits applied” and “credits missing” scenario for sensitivity.

FAQ

Do tax credits reduce PAYE?

In most scenarios, tax credits reduce your PAYE liability. That is why two people with the same salary can have different PAYE deductions depending on credits and filing status.

Do tax credits reduce USC or PRSI?

Usually not. USC and PRSI are calculated separately using their own rules. This is why you may see PAYE change while USC and PRSI stay similar.

Why might PAYE look high if my credits are not applied?

If credits are missing or not allocated as expected in payroll, PAYE can be higher. For planning, model scenarios with and without credits. For accuracy, confirm your credit allocation.

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