Tax return and Buy to Let mortgage

shining_light

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?

Nomunnofun1

shining_light said:

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

Your mortgage interest goes in the box for 'finance costs' -this is how much it's costing you to borrow the money

dinosaur66

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

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

dinosaur66 said:

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

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

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

dinosaur66 said:

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. 

https://assets.publishing.service.gov.uk/media/67ed507de9c76fa33048c6b1/sa105_notes_2025.pdf

Nomunnofun1

Box 43 - losses carried forward:

dinosaur66

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.