any accountants please respond, I am in a position where we received a sizeable invoice and sent to accountants on 12-28-21 that we invoiced and received payment on Dec21. The accountants post dated the check into Jan3 22 even though it was acknowledged on the same 12-29-22, the check was post dated to match payments terms for the supplier. This is cost of goods that should have been shown on year 21 and now since it was not shown really have me jacked up for this year. Can I have them do an ammended tax return based on this information?

For the record accrual vs. cash basis is very confusing to me.