HI Bob2810
Basically, you need to do a few things:
1: De-register for mortgage interest relief at source by contacting the TRS Section of the Collector General. You should notify them of the date that you will no longer be occupying the property as your PPR.
2: For the period in 2008 that you are renting out the property you will be entitled to deduct the interest for the period from the rent for that period to calculate the net taxable rent.
3: Section 247 of the Taxes Consolidation Act 1997 says the following regarding first time buyers interest relief:
[”relievable interest”, in relation to an individual and a year of
assessment, means -
...
but, notwithstanding the preceding provisions of this definition
and subject to paragraph (c), as respects the first [7 years]of
assessment for which there is an entitlement to relief under this
section in respect of a qualifying loan, "relievable interest", in
relation to an individual and a year of assessment, shall mean -
(iii) in the case of -
(I) an individual assessed to tax for the year of assessment in
accordance with
section 1017,
or
(II) a widowed individual,
the amount of qualifying interest paid by the individual in the year
of assessment or, if less, [€8,000]
The highligted text in bold is the key to your last question. What it is saying is that for the first 7 years you have entitlement to claim mortgage interest relief on the interest due to it being your PPR you can claim the enhanced limit. You only have the entitlement to the higher limit when you are occupying the property as your PPR. So if you move out, then move back in again in say a year or 2 you simply add up the 2 periods and for the first 7 years of both periods you will get the extra interest limit.
Hope this answers your question. If not just PM me.