SAIM10050 | Relief for interest paid: certificates from lenders
From HM Revenue & Customs · Savings and Investment Manual
Information requirements
ITA07/S412 entitles a borrower who is claiming relief for loan interest relief to request a statement from the lender showing:
the date the debt was incurred,
the amount of the debt when incurred,
the interest paid in the year of assessment for which the claim is made, and
the name and address of the borrower.
Under Self Assessment, the borrower will only normally be required to provide this information to substantiate a claim for interest relief if HMRC raise enquiries into the return or the claim. The claimant is able to obtain a certificate from the lender if he or she needs or wants to do so. Lenders do not need to issue certificates routinely.