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Tax return and Buy to Let mortgage

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Hi,

I'm a landlord filling in my tax return for the first time, and as the title suggests I have a buy to let mortgage. I know that I can't list the interest on this as an expense, but I should be able to use it to get 20% tax relief. However, I have no idea where I am supposed to enter the details in order to claim this relief. Every website I go to that mentions this says to go to 'box 44', but I have no clue where that is on the tax return. For context, I am filling it out online so nothing is numbered. 

Can anyone help here?
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  • Nomunnofun1
    Nomunnofun1 Posts: 675 Forumite
    500 Posts Name Dropper
    edited 13 May at 6:09PM
    Hi,

    I'm a landlord filling in my tax return for the first time, and as the title suggests I have a buy to let mortgage. I know that I can't list the interest on this as an expense, but I should be able to use it to get 20% tax relief. However, I have no idea where I am supposed to enter the details in order to claim this relief. Every website I go to that mentions this says to go to 'box 44', but I have no clue where that is on the tax return. For context, I am filling it out online so nothing is numbered. 

    Can anyone help here?
    Here is the paper version - box 44 is ‘residential property finance costs’

    https://assets.publishing.service.gov.uk/media/67ed5069e9c76fa33048c6b0/sa105_2025.pdf

    Look for that entry!
  • FlorayG
    FlorayG Posts: 2,208 Forumite
    Seventh Anniversary 1,000 Posts Photogenic Name Dropper
    Your mortgage interest goes in the box for 'finance costs' -this is how much it's costing you to borrow the money
  • dinosaur66
    dinosaur66 Posts: 272 Forumite
    100 Posts
    you are correct 20% of your total mortgage buy to let interest is what you can claim

    it has changed this year a little bit

    i did my tax return in april and i am a landlord

    it goes in the property section of your tax return

    section uk property 43 residential property finance costs

    put in the 20% of buy to let interest paid figure in this box


    please note from memory this figure does not show up as having been accounted for by hmrc until you submit your return which is when i checked then it has been taken off and accounted for on your tax return.

  • dinosaur66
    dinosaur66 Posts: 272 Forumite
    100 Posts
    i see you are struggling to be sure where box 44 is

    as i said underneath the boxes there is writing help section
    and as i said it comes under the uk property 43 residential property finance costs

    the 43 is written underneath this box and number must have now changed unless my tax return was totally different  as i said i did it end of april and it was definatley 43 this year
  • Nomunnofun1
    Nomunnofun1 Posts: 675 Forumite
    500 Posts Name Dropper
    i see you are struggling to be sure where box 44 is

    as i said underneath the boxes there is writing help section
    and as i said it comes under the uk property 43 residential property finance costs

    the 43 is written underneath this box and number must have now changed unless my tax return was totally different  as i said i did it end of april and it was definatley 43 this year
    It’s box 44 - 43 has to do with losses - and this is the 2024/25 version

    https://assets.publishing.service.gov.uk/media/67ed5069e9c76fa33048c6b0/sa105_2025.pdf

  • dinosaur66
    dinosaur66 Posts: 272 Forumite
    100 Posts
    my actual 2024/2025 return from 3 weeks ago on hmrc tax return for this section
    box 43
    losses are box 42
    this is my return
    i have 1 property left that is on a buy to let


  • dinosaur66
    dinosaur66 Posts: 272 Forumite
    100 Posts
    without reading hmrc guidance again i think you put in the total interest figure and hmrc take off the 20% themselves  but not sure on this hopefully someone who knows for sure will advise you on what ammount to put in
  • Nomunnofun1
    Nomunnofun1 Posts: 675 Forumite
    500 Posts Name Dropper
    edited 15 May at 9:57PM
    my actual 2024/2025 return from 3 weeks ago on hmrc tax return for this section
    box 43
    losses are box 42
    this is my return
    i have 1 property left that is on a buy to let


    Please see the attached guidance into completing your tax return. I fear that there be an error in the numbering on the online version. It has always been box 44. You are correct when you say that the total interest is entered in that box. 

  • Nomunnofun1
    Nomunnofun1 Posts: 675 Forumite
    500 Posts Name Dropper
    Box 43 - losses carried forward:


  • dinosaur66
    dinosaur66 Posts: 272 Forumite
    100 Posts
    i know it says that in all the guidance but when you fill out the tax return for this year in the HMRC property section  it comes up box 43 this year

    the photo is my actual tax return which i have submitted

    box 44 is this year unused resedential albeit it has no number attached and does not say box 44

    box 45 was the big box supplementary for writing out anything else on

    i cannot put up a full picture as my tax reference number is on top of all pages

    but the £1092 figure was my total interest i paid on the property last year and remember the 20% tax releif did not show up as having been accounted for by HMRC until after i had submitted the return.
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