Quartli — Quarterly Tax Estimator

South Dakota Quarterly Estimated Taxes (2026)

South Dakota has no state income tax — self-employed workers in South Dakota only owe federal quarterly estimated taxes. You still pay the IRS four times a year (April 15, June 15, September 15, January 15), covering federal income tax and the 15.3% self-employment tax.

Example: freelancer earning $80,000 in South Dakota

A single filer with $80,000 of net self-employment income in 2026 (standard deduction, QBI deduction per Form 8995):

Federal self-employment tax$11,304
Federal income tax$5,344
Federal quarterly payment$4,162

Federal figures computed with official 2026 IRS brackets (Rev. Proc. 2025-32).

2026 quarterly due dates

QuarterIncome periodFederal due date
Q1Jan 1 – Mar 31, 2026April 15, 2026
Q2Apr 1 – May 31, 2026June 15, 2026
Q3Jun 1 – Aug 31, 2026September 15, 2026
Q4Sep 1 – Dec 31, 2026January 15, 2027

Frequently asked questions

Does South Dakota require quarterly estimated tax payments?

Only at the federal level. South Dakota has no state income tax on wages or self-employment income, so self-employed residents only make federal quarterly estimated payments to the IRS.

What is the South Dakota income tax rate for 2026?

South Dakota has no state income tax, so the rate is 0% on self-employment income.

When are quarterly estimated taxes due in South Dakota in 2026?

Federal deadlines apply everywhere: April 15, 2026 (Q1), June 15, 2026 (Q2), September 15, 2026 (Q3), and January 15, 2027 (Q4).

How do I calculate my quarterly taxes as a freelancer in South Dakota?

Start with the federal side: self-employment tax (15.3% on 92.35% of net earnings) plus federal income tax, divided into four payments. Quartli's free calculator does this instantly using official 2026 IRS figures.

Reviewed by Lena Hanna, CPA · Last updated June 2026 · Federal figures per IRS Rev. Proc. 2025-32; state planning rates per the official 2026 state brackets as compiled by the Tax Foundation.

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