UCITS ETF tax return

Hi.

I’ve an Irish domiciled UCITS ETF that is coming up to 8 years old. It’s worth more than I paid for it.

Can anyone advise where on what tax form I fill in the details to make the deemed tax payment at 8 years? Also, if I ultimately sell it, how and where I fill in all the details of sale amount, purchase cost and the deemed tax payment I’ve already made?

Thanks

Has to be done on Form 11. Register for ROS to do it online.
There's more info in the EFT's area. E.g. this thread.