Note that your tax return is considered "filed" the day you mail it...however, you should really have proof of mailing, especially with the delays currently in the USPS.
If you send the return by USPS, use registered or certified mail.
You can use a "PDS" (private delivery service) like UPS or FedEx or DHL. However, two caveats:
1. Only certain services qualify for the proof of mailing (see this IRS link), and
2. If you use a PDS, you must send to a street address, not a PO Box (see the link Here are the street addresses of the submission processing centers for delivery by a PDS on the IRS page above).
This means that you can still wait a few days before mailing/shipping.
The important thing is to give the IRS a chance to process your initial return before they process your amended return. One way to do that is to wait for your refund, which would show that they had processed your initial return.
However, do NOT miss the filing deadline in any case - if your refund is not back, send your state return anyway.
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