Stamp Duty clawback

A

Auditor

Guest
My girlfriend bought a new apartment and was exempt from Stamp Duty. She has lived in her apartment for 2 years. She is now moving in with me and was advised that SD is clawed back on a pro-rata basis if she rents it out. IE only 3/5's will now be payable. Is this true? or will she have to pay the entire amount that would have been due at the start?
 

entire amount will be due. I have checked that with the revenue before