Adult dd is currently living at home. She has just secured a FT job paying around £1800 net/month. Trying to consider what might be a fair 'keep' to charge her. 22% would be around £400. This would leave her £1400 to spend on just her and any additional, special' foods/personal toiletries/make-up etc she might want. I'd provide the basics like pasta, meat, etc.
Does this seem fair? It's a far greater remaining amount she'd have than I do (I work FT too but no mortgage). I don't feel easy about charging but I'm a single income household with an additional teen at home in FT education.