I used to run my self employed business from my flat. I had bathroom, bedroom, hallway, kitchen, living room and garage. I paid maintenance, council tax, electric, water, mortgage interest, telephone.
What do you mean by "used to"? Are you trying to introduce expenses retrospectively into your accounts for past years? It's possible, within limits, but I wouldn't really recommend this kind of "afterthought" rewriting of accounts.
Having said that, you can claim a reasonable amount based on what additional actual costs you had as a result of running the business at home as opposed to not doing so. This boils down to claiming a share of the phone usage bills but not of line rental (unless you put in a separate line for business use only), a share of elctricity bills (e.g. for powering equipment (buth that won't be much) and heating while you were working at home if you would otherwise have turned the heating down while out during the day), water (for extra toilet flushing but only if metered).
It would be unwise to claim a share of maintenance, council tax, and mortgage interest unless there is a defined proportion of the total space which is exclusively used for the business, but if you do that you may lose some of the Private Residence Relief entitlement against CGT when you sell the place, and it may make you liable for business rates.
Many thanks. I'm using the dining area of a combined lounge/dining room as an office. I assume because it is only part of a room mainly used for residential purposes, business rates are not applicable. What sort of percentage of the rent would be seen as reasonable since during the day the bathroom and kitchen are also used when working. It is a 3 bedroom house and I am employed (director) of a Ltd company.
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