claim 20% mortgage loan interest relief for finance cost of property

Hello, can you advise how best to claim several years of missed 20% mortgage loan interest relief for finance cost of property?

Hi Mark Conn,
 In relation to claiming previous years mortgage loan interest relief, as per:
HS340 Interest and alternative finance payments eligible for relief on qualifying loans and alternative finance arrangements (2021) Updated 6 April 2024
You may claim relief for a maximum of four years prior the current tax year as an overpayment relief claim.
Details can be found here as per Overpayment relief and residential property finance cost restrictions:
SACM12150 - Overpayment relief: Form of claims
Restricting finance cost relief for individual landlords
Thank you. 

Not HMRC...the reason you cant claim it all at once later is because each year needs to be considered by reference to the property profit only, the interest tax credit is restricted to this regardless of other income, and, if it covers the basic rate element in full any unusued amount is then carried forward as unused and added to the following year, and repeat, and repeat. This makes making an overpayment releif claim problematic, unless the profit from property fully supports all the interest claimed in each individual year (the full amount is claimed but relieved at 20%). You need to look at each year in isolation...EXAMPLE ONLY...if property profit in year one was £5000 and interest paid was £4000 then you would get the full £4000 at 20% i.e. £800 as a tax credit against it, reducing overall tax due by £800, if however property profit was £5000 and interest was £6000 then you would get the reduced amount of £5000 at 20% tax credit, i.e. £1000, and the balance £1000 of interest would be carried forward to the following year...at no point do you consider ANY other taxable income in working out the tax credit...property income only. So you need to review each year individually to make the claim for the interest by reference to assessable profit from property individually. If each year the interest is less than profit, great, you can claim it all in each year as it happened, if not then you need to carry forward unused interest and add it to the next year and work that out, and so on...