The Revenue allow 2 different ways to calculate your tax liability when one jointly assessed person is claiming the tax credit.
From Revenue website:
You cannot claim both the
increased standard rate cut-off point for dual income couples and the Home Carer Tax Credit during the tax year. Your
Revenue office will help you to determine which is better for you.
So option 1:
The increased standard rate band for you €51000 and the lower standard band for the stay at home person €33000
But no home carer credit is allowed to be claimed at all for that year.
Must be Jointly assessed.
Option 2:
Both of you have equal standard rate cut off bands €42000
and the stay at home person can claim the home carer tax credit.
Home carer can earn €7200.
You can divide the rental income between you as you wish.(You could take the excess rental income above €7200)
Must be Jointly assessed.
Option 1 is often more beneficial if 1 person is in the higher tax bracket.
Revenue are supposed to calculate under both above options and tax you accordingly in the most beneficial way.
So its helpful to run the numbers yourself aswell just in case and understand both options open to you.
The figures above are for 2024.