Urgent: Applying for mortgage but tax calculation and tax overview don't match

Hello all, I'm in the middle of a mortgage application and have supplied all my tax docs. I'm fully paid up. Today the broker highlighted that there is a £942 discrepency between the tax that I owed in one of the years on my self-assessment tax calculation and tax overview documents. They said the lender will not proceed unless this has been reconciled. After waiting in a long phone queue, I finally got to speak to an agent. They said that the two documents reconcile on their end and said they can confirm this by post. The problem is that by that time the property will not be reserved. To make matters worse, the call got cut off. The strange thing is, the discrepency is exactly the amount that I was awarded in an SEISS grant in the same year, which my accountant forgot to declare. What are my options here (if any)? Before the call ended, they mentioned that they cannot confirm it by mail, but is there any case where an exception can be made? Any help would be appreciated.

Hi Asaf Fialkov,

We would need to check your records to review the tax calculation and overview and would only be able to send copies by post.
You would need to contact HMRC to review. Self Assessment: general enquiries

Thank you.
 

Hi. How did you fixed this? Facing same issue please

Hi Shadab,
It could be that the letter was issued before your name was updated.
If this was not the case then you will need to contact HMRC to review:
Income Tax: general enquiries
Thank you.