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Anita, thank you for your reply. For the period your son had not made the smaller home his permanent place of residence, the profit from rental income for that period would be shared by all joint owners. From the time he takes residence then he could opt for rent a room scheme as he would have a lodger.
You have the flexibility of changing from method A to method B annually. If your expenses are in excess of £4,250 then you are better off going for method A as you would be taxed on net profit (and this may be lower) instead of the excess over £4,250. If not then you should opt of method B. You can swap and change between A and B every year.
You should perform a comparison of net profit using both methods and opt for the one producing lower chargeable profit for tax purposes.
I hope this is helpful.