Is a postmark of the 20th acceptable as proof of the mailing date?
Yes, but be careful to make sure the post office has the proper postmark if taxes are mailed on the 20th.

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1. When are my taxes due?
2. If I have no tax liability, do I still need to file a tax return?
3. Is a postmark of the 20th acceptable as proof of the mailing date?
4. When do I report / remit sales taxes?
5. What happens if I do not file on time?
6. What is the vendor's fee?