Quarterly Estimated Tax Calculator — South Dakota (2026)
If you earn income in South Dakota without withholding — freelancing, contracting, rentals, dividends — the IRS expects payment four times a year, not once. This calculator turns your expected 2026 net profit into a per-quarter number covering self-employment tax, federal income tax and no state tax, since South Dakota has none. South Dakota does not levy a personal state income tax, so the only mandatory withholding on your earnings is federal income tax plus FICA (Social Security and Medicare).
South Dakota Quarterly Tax Calculator
Gross 1099 income minus business expenses.
2026 due dates and safe harbor
Federal estimated payments are due April 15, June 15, September 15 of 2026 and January 15 of 2027. You avoid penalties by paying either 90% of the current year's liability or 100% of last year's (110% if prior-year AGI exceeded $150,000) — the safe-harbor rule.
There is no South Dakota estimated payment to make — the state does not tax personal income, so you only file federally.
Underpayment penalties
The IRS charges interest-style penalties per quarter you fall short, currently around 7–8% annualized. Paying late in the year does not fix an early-quarter shortfall unless you use the annualized income method on Form 2210.
Irregular income is common in finance work around Sioux Falls: if Q1 is slow and Q4 is huge, the annualized method usually beats four equal payments.
Paying as a South Dakota taxpayer
Pay federally through IRS Direct Pay or EFTPS — no state portal is needed.
South Dakota has no state income tax. State sales tax was reduced from 4.5% to 4.2% in 2023.
Local and payroll taxes South Dakota adds on top
South Dakota adds no state-mandated employee payroll deduction beyond FICA, so nothing extra is taken from your gross pay at the state level.
South Dakota has no state income tax. State sales tax was reduced from 4.5% to 4.2% in 2023.
Nobody withholds these for you when you are self-employed in South Dakota. Local wage taxes, city business licences and gross-receipts style levies are yours to register for and remit alongside your quarterly federal and state estimates.
Working across a state line from South Dakota
South Dakota has no income-tax reciprocity agreements, so if you live here and work across a state line you generally file a nonresident return in the work state and claim a credit at home to avoid double taxation.
Remote and hybrid work complicates this further: most states tax income where the work is physically performed, so a Sioux Falls resident spending part of the year at a client site in North Dakota may owe a nonresident return there. Keep a day-count log if you split time between states.
The rest of your South Dakota tax bill
South Dakota charges a 4.2% state sales tax, homeowners pay an average effective property tax of 1.17% of market value, and the minimum wage in force during 2026 is $11.50 an hour.
Municipal taxes bring combined rates to roughly 6.1%.
Income tax is only one part of a state's take. South Dakota recovers revenue through sales and property tax as well, which is why headline income tax rates alone are a poor guide to how far a salary really goes. With no state income tax, Social Security, pensions, 401(k) and IRA withdrawals are all free of state tax here.
South Dakota vs North Dakota on the same salary
On a $90,000 salary, a single filer keeps about $72,145 a year in South Dakota against roughly $71,576 in North Dakota — a difference of $569, or $47 a month.
Effective combined rates are 19.8% in South Dakota and 20.5% in North Dakota. Set that gap against living costs: index 93 here versus 95 there, with property tax at 1.17% and 0.98% respectively.