Backdate Tithing Donation

I'm the financial clerk in my unit, and there is a member who is trying to backdate a tithing donation to 2025. He pays annually and, among the tax benefits and ability to itemize, doesn't like the look of not having donated at all in 2025, especially given that he holds a significant calling. Is there any way to backdate a donation at this point? He hasn't made it yet, so it is not a situation where it was in a bishopric member's hands before January 1. I want to be accommodating while also upholding policy. Any insight is appreciated.

The only time backdating is allowed is:

• If it was received in 2025 (perhaps handed to the bishop) but not processed until 2026.
• It was mailed and has a postmark in 2025

This isn't church policy, this is the law of the land.

Edit: More details at Prior Year Donations.

While it's not a good look, this doesn't affect his status of full-tithe payer.

There are plenty of us that haven't had their tithing visible to their wards for a long time, I've never had a Bishop or Stake President question it and I've served in callings where I attended Bishopric and Stake Presidency meetings - more than once.