Have you tried the Revenue website (links below) and the many existing threads on this issue? Post details of your mortgage (e.g. single or joint buyer, FTB or not, start date, original amount, original term, rate etc.) and people can advise on your specific situation.
Tax Relief at Source (TRS) TRS can be claimed in respect of qualifying loans secured on the deeds of your main residence i.e. a new mortgage, a top up loan, a home improvement loan, a re-mortgage or a consolidation of existing borrowings
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Strictly it's not up to the lender but I think that most will normally give you or point you to the TRS1 form. I have no idea why your lender might not have done this.
I am assuming that this is an owner occupier mortgage? If it's not then owner occupier mortgage interest relief does not apply.