United States · 2026
Montana vs South Dakota Income Tax 2026
At a $100K salary, South Dakota is about $4,289 cheaper in 2026.
State brackets
4.7%
Bracket 1
$0to$47,500
5.65%
Bracket 2
$47,500and up
NO STATEIncome tax
South Dakota levies no state income tax for 2026. Only federal income tax applies.
At common incomes, what's the tax difference?
Federal + state income tax after standard deductions, 2026. Excludes FICA.Compare your income
$
We'll pin your result at the top.Income
Montana tax
South Dakota tax
Difference
$50,000single filer
$5,41310.8% effective
$3,8207.6% effective
$1,593 lessin South Dakota
$100,000single filer
$17,45917.5% effective
$13,17013.2% effective
$4,289 lessin South Dakota
$200,000single filer
$46,67323.3% effective
$36,73418.4% effective
$9,939 lessin South Dakota
Federal income tax (same for both)
7 brackets · 10–37% · applies on top of state rates
10%
to $12,400
12%
to $50,400
22%
to $105,700
24%
to $201,775
32%
to $256,225
35%
to $640,600
37%
$640,600+
MT
Montana
SD
South Dakota