A $120,000 salary in South Dakota takes home about $93,250 a year ($3,587 per biweekly paycheck) after $17,570 federal income tax, no state income tax (South Dakota does not tax wages) and $9,180 FICA (Social Security and Medicare). Assumes a single filer taking the standard deduction, 2026 federal and South Dakota rates, and no 401(k) or other pre-tax deductions.
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