Landlord insurance premiums are generally an allowable expense against rental income in the United Kingdom, because they are incurred wholly and exclusively for the property business. The useful detail is in the edges: what happens with a mixed use property, with a premium covering a period before letting, and with cover that is really personal.
The general position
Insurance on a property let commercially, buildings, contents, liability, loss of rent and rent guarantee, is normally deductible as a revenue expense of the property business in the year it is incurred. This is the ordinary treatment and applies to most landlords with an ordinary letting.
Where apportionment is needed
A property let for part of the year and used privately for the rest, or a building part let and part occupied by the owner, needs the premium apportioned on a reasonable basis. Keeping the basis written down at the time is far easier than reconstructing it later.
What falls outside
Cover for a period before the business started or after it ended, insurance on a property not let commercially, and anything that is really personal cover rather than a business expense. This page is a summary rather than tax advice, and an accountant is the right person to confirm a specific position.
Questions people ask about is landlord insurance tax deductible
Can I deduct landlord insurance from rental income?
Generally yes, as a revenue expense of the property business, because it is incurred wholly and exclusively for the letting.
What about a property let only part of the year?
The premium is apportioned on a reasonable basis. Write down the basis at the time rather than reconstructing it later.
Is rent guarantee deductible too?
Normally yes, on the same basis as the rest of the property insurance. Confirm a specific position with an accountant.