All payments have to be made by calendar year-end if you want the funds to come out of the correct year budget. So if any payment is done now, it will come out of the 2022 budget, not 2020.
Frequently this is an issue when the Christmas dinner receipts are turned in late and the funds for the new year are used to reimburse last years' dinner.
But off hand, I can't remember any guidance as to when it's "too late" to give a reimbursement. That might be up to local leadership.
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