As a PAYE taxpayer, how to complete a BBSI letter from HMRC?

Dazed_and_C0nfused

Mee said:

Thanks for the advice here.
I've had other things on my mind of late and I only checked my tax code for 2025/26 yesterday to find it has been  reduced due to apparently having earned 3K in untaxed interest. I earn on average £6 or 7K a year now on a zero hours/casual contract (PAYE) so I somewhat bemused by it all. Anyway will ask for a BBSI as suggested.

So you have spare tax code allowances that the untaxed interest is using?

Somerset_Alan

Thanks for all the comments on this.  Just to wrap it up, I did complete the information for all non-ISA accounts.  Sent off a big package of data.  And I haven't heard anything, not even an acknowledgement.

Meanwhile, it has encouraged me to take a look at what interest was earned, and what was assumed by HMRC, for the last few years - just in case.  And I will ask HMRC for bank and building society interest details for those years.