An extension to file is not an extension to pay tax.
Missouri automatically extends the filing deadline for any taxpayer who was granted a federal extension - filing a copy of the federal extension with the Missouri return (or by the return's due date) automatically extends the Missouri due date to match, up to a maximum of six months (except for taxpayers outside the United States). A taxpayer without a federal extension who still needs more time files Form MO-60.
| Item | Detail |
|---|---|
| Form required | None if a federal extension was granted and filed with the Missouri return; Form MO-60 otherwise |
| Automatic | Yes, when tied to a federal extension |
| Extension length | Matches the federal extension, capped at 6 months (no cap for taxpayers outside the U.S.) |
| Payment | A federal payment extension similarly extends the Missouri payment deadline when filed with the director of revenue; otherwise tax is due by the original date |
| Authority | RSMo §143.551 |