Revenue expenses of advertising for new tenants are allowable;
for example, the cost of placing adverts in newspapers. But the
landlord cannot deduct the cost if it is capital expenditure; for
example, expenditure on permanent signs or other permanent
equipment for displaying vacancy details.
The expenses of advertising property to buy or sell is also
capital expenditure and not allowable as a deduction for IT
purposes. Such expenditure may possibly be taken into account for
CGT purposes when the property is sold (for detailed guidance see
the CG manual).