Deductions & credits

And the idea of a post-dated check will not work.   Post-dated checks only work if the check is given to a trusted individual that has agreed to not deposit it until the date on the check.  

Once a check is signed it becomes negotiable reguardless of the date.   Government agencies are not going to look at the date, they will simply deposit the check along with the thousands of other checks as soon as it is received.  Their banks computer that reads the deposited checks will pay no attention to the date which is really for your information.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**