South Dakota State Tax Extension
South Dakota Personal Tax Extension
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Personal Income Tax Extension
StateSouth Dakota
Extension Status✓ No State Income Tax
State AgencyN/A
South Dakota Personal Income Tax – No State Income Tax
South Dakota does not impose a personal state income tax on individuals. South Dakota residents have no state income tax return to file and no state extension to request. Your only income tax obligations are at the federal level.No State Income Tax
South Dakota Residents File No State Return
South Dakota is one of nine states with no personal income tax. There is no state return, no state extension form, and no state payment due. Your tax obligations as a South Dakota resident are entirely federal.Federal Obligations Still Apply
File IRS Form 4868 by April 15 for a Federal Extension
While South Dakota has no state income tax, federal income tax obligations remain. If you need more time to file your federal return, submit IRS Form 4868 by April 15, 2026, to extend your federal deadline to October 15, 2026. Any federal tax owed is still due April 15.No South Dakota state return required: South Dakota has no personal income tax. Federal obligations still apply – file IRS Form 4868 by April 15 if you need a federal extension, and pay any federal balance by April 15, 2026.
Federal Extension Still Matters
South Dakota residents who need additional time to file their federal return should file IRS Form 4868 by April 15, 2026. This moves the federal filing deadline to October 15, 2026. Any federal income tax owed must still be paid by April 15 to avoid IRS penalties and interest – the federal extension covers only the filing deadline, not payment.Best Practices
- ✓No South Dakota state return is required – there is no state income tax.
- ✓File IRS Form 4868 by April 15, 2026, if you need more time for your federal return.
- ✓Pay any federal income tax owed by April 15 – the federal extension does not defer payment.
- ✓File your federal return by October 15, 2026, if you filed IRS Form 4868.
Quick Reference Table
| Item | Details |
|---|---|
| State Abbreviation | SD |
| Extension Status | No State Income Tax |
| State Return Required | No – South Dakota has no personal income tax |
| Federal Extension | IRS Form 4868 – file by April 15, 2026 |
| Federal Extended Deadline | October 15, 2026 (with Form 4868) |
| State Payment Agency | N/A – No South Dakota income tax |
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South Dakota has no personal state income tax, so there is no state extension payment to make. Your only payment obligation is federal – any federal income tax owed is due by April 15, 2026, regardless of whether you file IRS Form 4868.Federal payment still due April 15: File IRS Form 4868 by April 15 to extend your federal filing deadline to October 15, 2026. Pay any federal balance owed by April 15 to avoid IRS penalties and interest.
No State Mailing Address Required
No South Dakota State Payment
South Dakota has no personal income tax. There is no state mailing address for extension payments. For federal payments, visit irs.gov/payments or mail your payment with IRS Form 1040-V.
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