If by "upload", do you mean TurboTax won't E-file Form 8453-S, Form 8453-S, Declaration for an IRS e-file Return is not supported for E-file. You'll have to print and mail it in.
Use Form 8453-S to:
- Authenticate an electronic Form 1120S, U.S. Income Tax Return for an S Corporation,
- Authorize the ERO, if any, to transmit via a third-party transmitter,
- Authorize the intermediate service provider (ISP) to transmit via a third-party transmitter if you are filing online (not using an ERO), and
- Provide the corporation’s consent to directly deposit any refund and/or authorize an electronic funds withdrawal for payment of federal taxes owed.
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