Host is asking for my passport number two months later?

[Christopher64]

Hello, I had a recent stay in Peru which went fine. The host is now asking for my passport number, a couple months after the trip has come and gone, apparently in order to do her taxes. Just wondering if this is legit in some countries. I have stayed in many Airbnbs in Peru and no one has ever asked this after the fact. For check in yes passport is usually requested/required. The trip went fine and she was a good host. We fling around our passport numbers a lot with Airbnb international,  just wondering if I can decline or should I just give it to her.

Thanks for any guidance.

[Anonymous]

@Christopher64  If local laws require the host to collect passport numbers, the host screwed up by failing to do this at check-in. You're free to ignore or decline the request. 

[M199]

@Christopher64 

Ask the host to send you links to the legislation so you can validate their request for personal information.  If it doesn't appear valid, then refuse.