Capital Gains Tax -how to file?

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Hi all, looking for some help please. I am required to make a return and payment in respect of sale of an investment property that I sold last week.

I am a PAYE worker and have made annual form 12 returns for rental income generated from this house. Now I’m a bit confused as to whether I need to return and form 11 or 12 or a CG1???

Also, can someone advise if I can complete the relevant return through my account? Or do I need to provide a written return?

I am able to self assess/calculate what is payable, I’m just not sure how to do it! Many thanks for any or all assistance.

 

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For anyone coming after me, similar unsure:

Called revenue. Very helpful. Long story short I have to be issued a cgt cert. I then pay capital gains owing with a payslip. Full paperwork to be returned by the 2019 deadline next year, so October 2020. I’m told I can do everything through MyAccount.