One thing re tax I've often thought of is, how many landlords don't declare rental income? Especially the slumlord type - most likely to demand cash in hand, and there are plenty of slumlords about.
There is no national register of landlords, and on a self assessment tax return you are only asked how many properties you have, and what the rent is, they don't ask for addresses.
I wouldn't mind betting there are masses - and not just slumlords - who don't declare it at all, or who declare only part of it. If you don't declare it, who is to know? -that is unless your tenants suspect and shop you to the taxman.
This must be an obvious thing to crack down on. I do realise that it would mean more admin, but IMO given such a large private rental market in the U.K., it's high time it was better regulated.
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