Is it a Reg Z violation (or something else) if the bank did not provide a 1098 form to a customer in a timely matter?

Thanks

It has nothing to do with Regulation Z. The IRS will fine your bank for failure to timely file an information return.

Per occurrence:

Year due 2025 - Up to 30 days late - $60, 31 days late through August 1 - $130, After August 1 or not filed - $330, and intentional disregard - $660.

Thanks, does anyone know what the IRS violation number is, if there is one?

What do you mean a violation number? If you mean to file a complaint? Good luck with that with the IRS staffing cuts to find anyone that cares about a single taxpayer. They will assess penalties based on the late filing that they receive and not taxpayer complaints.

Ok. LOL.