Termination date first, since it's been asked three ways. The notice was served on 3 September 2025 and the termination date was 4 February 2026. About five months, not six.
Simply leaving your property does not terminate the tenancy, and you remain liable for rent, etc, until the tenancy is terminated.
Not on foot of a landlord's notice. s.62(1)(f)(ii) defines the termination date as the day "on or before which... the tenant must vacate possession". The Act builds early departure into the notice itself, so there's no tenant counter-notice, no two-week problem (Bronte), and nothing to agree. The tenants went on 15 September, the landlords took the keys and returned the deposit, and that was that. Landlord agreement not required as per the Act.
does the 12 months offer-back period start on the final date of the termination notice or in this case would it be 12 months from when the tenant moved out?
From the termination date. Paragraph 4(b)(i) of the Table to s.34 runs the 12 months "from expiry of the period of notice required to be given by the notice", so here 4 February 2026 to 4 February 2027. But that's the offer-back for a family member who moves in and leaves again. A family member who never moves in is the other case, s.56(1)(c)(ii), and that's the one this Tribunal decided.
On the CAO argument: it's about an inference. The Tribunal's own record of the evidence never records anyone saying "college". It records "proximity to UCD" and "the week after CAO offers". The reasons then say the tenants were "told that she required the dwelling as she was due to commence studying in UCD". Whether that inference is a good one is what we're all debating. The Tribunal didn't debate it; it wrote it down as something the tenants were told.
Which brings it back to DannyBoyD's point, and he's right. February was the date that mattered. The investigator's two months before it prove nothing about a daughter planning a February move, and the Tribunal said so: "some question" about occupation after February. What filled that gap was the landlords' absence, and on occupation that's legitimate. On motive it isn't. s.56 asks one question, did she move in, and the Tribunal had its answer. It then found "ulterior motivation" on the back of the same absence, with no statutory test to stop it. A daughter who stayed abroad, a job that fell through, a landlord who missed the letter: all of them get the same finding of bad faith on this reasoning, because the Act never asked the Tribunal to make it.