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A clear explainer for a common “why can’t my spouse use my employee tax credit?” search.
Some credits are linked to employment and are typically used by the person who is working. This is why “sharing credits” under joint assessment does not mean every credit can be moved freely.
When the second income is small or sporadic, credit usage can become the deciding factor. Two households with the same combined income can still see different outcomes if credits are used differently.
Compare outcomes at the same combined income but with different splits (for example €60k + €0 vs €40k + €20k). Watch whether the best option changes.