Are you also going to use the limbo/suspense account when: a) you make an transaction at the ATM after the cutoff, so that it doesn't post until the next day b) when you make a credit card transaction that doesn't post for a day or two c) when you mail a deposit to your brokerage account d) when you write a check for a bill e) when you write a check to a niece/nephew/child/etc for a present f) etc, etc, etc.
Very few transactions post on the day that they're initiated (to use your terminology).
While it's certainly your perogative to use the limbo/suspense account any way that you want ... I can readily see you doubling the amount of data without adding anything useful to the information.
Why wouldn't it be useful? Because, even for tax purposes, it's the transaction date that matters. NOT the posting date. If you receive a paycheck on 12/31, it's taxable as of 12/31. Not 1/3 of the next year when it posts to your account. Same for charitable contributions made
12/31, etc.
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