Payslips for mortgages

Uriziel

I might want to take out a mortgage in the future and wonder if the actual net pay on a payslip matters or if they only look at the gross. HMRC has noticed recently that I had untaxed interest last year so now they nullified my personal allowance and made it -8k instead which is why my net pay on the payslip has taken a hit.
Would it have been better to pay HMRC directly and avoid this being on my payslip? Would this impact how much I can borrow for a mortgage?

ACG

I think a lot will depend on how much you owe HMRC and how long it will take you to pay it back. 

It might affect affordability, but it would if you were paying them directly also. 
Why have they had to do an attachment to earnings? Was there a reason you did not arrange to pay them back? 

whizzywoo

ACG said:

I think a lot will depend on how much you owe HMRC and how long it will take you to pay it back. 

It might affect affordability, but it would if you were paying them directly also. 
Why have they had to do an attachment to earnings? Was there a reason you did not arrange to pay them back? 

It's not an Attachment to Earnings.  It's a reduction in code number, lots of people have them to make it easy to pay unpaid tax, usually in arrears.