Ray Stafford, surely the £4k comes right off annual income as an expense before any tax is calculated? Meaning he doesn't pay anything for the boiler renewal just less tax, when I do any repairs to any of our properties I send the invoice to the accountant as an expense that's why my sons accountant told my son to buy a "large asset" rather than pay it in tax
Work through an example.
Lets say that this theoretical landlord has letting income of £30,000 and other legitimate tax deductible expenses of £10,000 and that he pays tax at 25%, and that the boiler swap and associated work would cost £4,000. It doesn't really matter whether these figures are perfect - this is just an example.
Scenario 1: If he doesn't change the boiler, his annual accounts show taxable profits of £30,000 minus £10,000 =
£20,000 profit - so he sends a £5,000 cheque to the tax man, and pockets £15,000 for himself.
Scenario 2: If he does change the boiler at a cost of £4,000, his tax deductible expenses are now £14,000. His accounts show a profit of £30,000 minus £14,000
= £16,000 profit. 25% of £16,000 is £4000, so thats the cheque he sends to HMRC and he takes home £12,000.
The difference between the two scenarios is that he has £3,000 less in his pocket and the taxman has £1,000 less to pay for public services. However, the taxman will probably get his £1,000 back and more, because of the additional taxes that the boiler manufacturer, merchant and installer will pay as a consequence of this extra installation.
The other main beneficiary is the tenant, who enjoys lower fuel bills. The landlord MIGHT gain through lower system maintenance bills, but thats far from certain - 552s are pretty robust.
Acquiring an asset is a slightly different kettle of fish, and the tax treatment is more complex, depending on what the asset is. But replacing an existing boiler in a let property is normally an expense, not the acquisition of an asset.