Personal Tax Information:

The State of South Dakota has no state income tax, so no tax extension needed here.

If you already received an approval notification from ExpressExtension, and you don't need to make a tax payment, then you're all done.

For more information, visit the State of South Dakota Department of Revenue website.
http://www.state.sd.us/drr2/Revenue.html

Business Tax Information:

The State of South Dakota does not have a state income tax. Therefore, there is no state of South Dakota business income tax extension. If you received an acceptance email from ExpressExtension that your federal tax extension was approved, there’s nothing more you need to do.

For additional information, please visit the State of South Dakota Department of Revenue website.
http://www.state.sd.us/drr2/Revenue.html