So it's more tax efficient to keep your ex home as a rental than to keep one of your other properties of similar value. Any gain in the pure rental will be subject to CGT.
If you rent out your home, you will not pay any CGT on the increase in its value up to the price you paid for it, €320k.
Even after that, the CGT is reduced significantly.
Let's say you keep it until 2026 and it increases from €200k to €400k in that time.
Sales price: €400k
Cost: €320k
Gain: €80k
PPR relief: 50%
Taxable gain: €40k
(The figures are slightly different due to the one year post occupation exemption, but the principle is the same.)
If you have a rental property today worth €200k and it increases to €400k, you will have €200k of a taxable capital gain. (Or you will use up valuable CGT losses if you paid more than €200k for it.)
Brendan