A Data Scientist earning $120K/year in South Dakota takes home $93,195 after all taxes. That’s $7,766/month, with an effective tax rate of 22.3%.
The estimated median salary for Data Scientists in South Dakota is $106K (adjusted from the national median of $115K using South Dakota’s cost-of-living index of 92). At $120K, you’re earning 13% above the state-adjusted median for this profession.
You’re earning above the median, suggesting you’ve moved beyond entry-level. As your career progresses, each raise will be taxed at your marginal rate, so understanding your bracket position helps you evaluate the true value of promotions and raises.
Filing as married filing jointly on $120K (single earner) saves you $7,585/year ($632/month) compared to filing single. This marriage bonus comes from the doubled standard deduction ($32,200 vs $16,100) and wider lower brackets.
Data scientists often receive significant equity compensation, especially at tech companies. RSU vesting creates lumpy income that can push you into higher brackets in certain years. Conference speaking fees and consulting income on the side are common in this field and must be reported as self-employment income. If you publish research or create open-source tools, any related expenses may be deductible as unreimbursed business expenses. Consider tax-loss harvesting on personal investments to offset gains from equity compensation.
At #5 out of 50 states for take-home pay on a $120K salary, South Dakota is among the best states for keeping your paycheck. You’d keep $0 more per year in Alaska (#1), or $0/month.
After adjusting for cost of living, South Dakota ranks #6 in purchasing power. That’s a drop from #5 in raw take-home — South Dakota’s higher cost of living erodes some of your advantage.