Will I Pay Tax If I Rent to a Family Member?

If I rent a room on an informal basis to one/ two members of my family, do I need to pay tax and if so what are the rules?

The money received will just be for bills and will not cover my mortgage payments.

Arthur Says:
If you comply with the rent-a-room rules then you don't need to pay any tax on the money received for the rooms. You can find these rules in the Revenue Property Income Manual page PIM4000 to 4060. If you don't comply with these rules it is quite likely that you will also not have any tax to pay if the money received only covers your expenses and nothing more. In this circumstance you need to make an accurate assessment of your expenses attributable purely to renting out the rooms.