Not legally, if you own in your own name. If you own through a company, the company’s money has to be kept separate from yours.
Even where it is optional, a separate account makes the year end faster and the figures harder to get wrong. Mixing rent with household spending means reconstructing a year of statements every January.
It also makes deposits cleaner. If you hold a deposit under an insured scheme, being able to show where the money sat is worth having.
A basic business or second personal account is usually enough. It does not need to be anything sophisticated.
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