GP has a point though – why doesn't the same logic apply? If I am an employer, I know your pay grade. Therefore, I know how tax cuts affect you. So if there is a cut in tax rates, why not just deduct the equivalent value you would've kept as extra due to the cut from your paycheck?

If rentals are being priced purely based on "what can renters afford", then your problem is with the housing market itself, not with UBI or anything else. Obviously UBI won't ameliorate a situation where housing is priced like that – in that case you would also need to ensure there is a larger supply of housing to make the market actually competitive, but it isn't a problem with UBI, it's a problem with housing.