Kentucky vs South Dakota
A tax calculator says the difference is $1,944 a year. Once you count what a dollar actually buys in each, South Dakota is $3,655 ahead — $36,546 over 10 years.
Property tax is set by counties, not states. Inside Texas alone the rate varies six times over, so this is the single choice that changes the answer most.
Does it work everywhere in South Dakota?
in what the money buys · $36,546 over 10 years
A pay cut of up to $4,603 (4.6%) still leaves you level.
Who worked this out, and what it is built on
I build and maintain every comparison on this site — 1275 state pairs so far, on the same engine that runs the tax calculators for all 50 states and 3,143 counties. This is not a template with two names swapped into it: Kentucky and South Dakota are run through the actual rules of each place, and if the numbers say the move is not worth it, that is what the page says.
Four sources, and one deliberate refusal. Federal figures from the IRS revenue procedure. State rates read one state at a time off each state’s own department of revenue. County property tax from the US Census Bureau. Cost of living from the Bureau of Economic Analysis Regional Price Parities, 2024 — and not from Numbeo or any other crowd-sourced index, because those are filled in by users, publish no methodology, and cannot be cited. That single choice is most of why the cost-of-living numbers here differ from everybody else’s.
When I get something wrong I publish the correction with the date and what it cost — including the two mistakes on these pages I found myself. Data last verified September 1, 2026.
Where to go from here
Almost nobody is choosing between exactly two places. These are the questions that usually come next, with the answer already attached so you can see which is worth opening.
Other moves involving Kentucky or South Dakota
States that sit near South Dakota on prices compared against Kentucky, and the mirror of that. The comparison you would run next.
- Alabama vs Kentucky— Alabama by $1,499
- Kentucky vs Louisiana— Louisiana by $4,038
- Kentucky vs North Dakota— North Dakota by $3,159
- Kansas vs South Dakota— South Dakota by $8,795
- Nebraska vs South Dakota— South Dakota by $6,300
- Missouri vs South Dakota— South Dakota by $4,691
Each state on its own
The full detail behind each half of the comparison above.
The counties that decide it
Property tax is set by county, and the spread inside one state beats most state pairs.
- Rockcastle County, Kentucky— 0.48%, the cheapest
- Campbell County, Kentucky— 1.06%, the dearest
- Oglala Lakota County, South Dakota— 0.44%, the cheapest
- Todd County, South Dakota— 2.23%, the dearest
Similar in price to Kentucky
States that sit next to Kentucky on the price index — often the comparison people should have run.
- New Mexico— 92.2 on prices
- Tennessee— 91.9 on prices
- Missouri— 90.8 on prices
- Kansas— 90.1 on prices
- Every Kentucky comparison— all 50
- Every South Dakota comparison— all 50
- The nine states with no income tax— and what they charge instead
Kentucky and South Dakota cost almost exactly the same, so this one really is about tax
Most comparisons on this site end up decided by the price level rather than the tax code. This pair is the exception: Kentucky indexes at 90.2 and South Dakota at 88.6 on the Bureau of Economic Analysis price index — 1.6 points apart, which is close enough that the deflator barely changes anything.
So the tax difference survives into the answer almost intact. Take-home differs by $1,944 and purchasing power by $3,655 — South Dakota ahead either way, which is unusual enough to be worth stating. When someone tells you tax rates decide where you should live, this is the shape of pair they are imagining — 281 of the 1,275, so a little over one in five.
Where the two sit nationally: Kentucky is the 40th most expensive place to live of the 51 — the 50 states and the District of Columbia — and South Dakota is 46th. Housing, the component that moves most, is 64.3 against 67.6.
Grey columns are what a year of Kentucky and a year of South Dakota are worth in the same money. The bars between them are each thing that changes, in the order it changes: green adds, amber takes away.
Where the money actually goes, line by line
Five separate taxes. On this pair the state income tax genuinely is the largest difference — $3,382 — which is less common than the coverage of this subject suggests:
Federal income tax — $13,170 either way. Identical, because it is federal. Any comparison that shows a difference here is wrong.
FICA — $7,650 either way. Also federal, also identical.
State income tax — $3,382 in Kentucky, $0 in South Dakota. South Dakota does not levy one at all, which is the fact that sells the move — and, as the next line shows, not the fact that decides it.
Property tax — $2,872 in Kentucky, $4,310 in South Dakota on a $400,000 home, at each state's median local rate. Smaller than the income tax gap here, which is not usually the case.
Local income tax — zero on both sides. South Dakota has none at any level, state or local — and that holds for all nine states without a state income tax, none of which lets a county or city levy one either. The two go together.
Total: $27,074 in Kentucky against $25,130 in South Dakota — 27.1% and 25.1% of gross.
And South Dakota housing costs 5.1% more
These two states cost almost the same to live in, which is why the tax difference survives into the answer. The index is the Bureau of Economic Analysis Regional Price Parity — official, published per state, 100 is the national average — and it is worth looking at the components even when the headline barely moves, because they can disagree with it.
Cheaper in South Dakota than KentuckyDearer in South Dakota than Kentucky
Each bar is how far apart Kentucky and South Dakota are on that component, and which way. Housing almost always runs several times wider than everything else — which is why a single blended index tells you very little.
All items — 90.2 in Kentucky, 88.6 in South Dakota. A gap of 1.6 points.
Housing — 64.3 against 67.6. A gap of 3.3 points, 2.1× the headline gap. This is what people mean when they say somewhere is expensive.
Goods — 96 against 95.5, 0.5 points apart — 6.6 times narrower than the housing gap — and typical: across all 1,275 pairs the median is 2.7 points for goods against 24.9 for housing. Blended into one figure, what you are reading is mostly housing wearing a general label.
Utilities — 75.3 against 79.7. 4.4 points apart, close enough not to change a decision.
Which half of this reaches you depends on whether you buy. Renting, the real difference between Kentucky and South Dakota is $5,335 a year — property tax comes out of your side entirely, and what is left is the price level. Buying a $400,000 home it is $3,655. So renting is where the gap is widest here, by $1,681 — unusual, and it means buying erodes the advantage rather than compounding it.
The number to take into a salary negotiation: $95,397
This is the question people are actually asking and almost nobody answers: what would I need to earn in South Dakota to live exactly as well as I do on $100,000 in Kentucky?
$95,397. That is 4.6% less than you earn now. You could take a pay cut of $4,603 moving to South Dakota and be no worse off — which is a very different conversation to have with a recruiter than "South Dakota has lower taxes".
The dashed line is the salary you earn now. The solid line is what matches it in South Dakota. If the relationship were a simple multiplier the two would be parallel — they are not, because brackets, the Social Security ceiling and a property tax that does not move with income all bend it.
The obvious shortcut fails here, and by a measurable amount. Scaling your salary by the ratio of price levels — $100,000 × 88.6/90.2 — gives $98,226. The answer is $95,397, so the shortcut is $2,829 too high: brackets, the Social Security ceiling and a property tax that ignores income all bend the line the shortcut assumes is straight.
The figure belongs to the two states and your income. On $40,000 the match in South Dakota is $39,528, 1.2% below what you earn; on $250,000 it is $234,403, 6.2% below. The relationship bends by 5.1% across that range.
Over 10 years: $36,546
At $3,655 a year, 10 years in South Dakota comes to $36,546 — and the county choice inside South Dakota is worth $71,572 over the same period. Both are real; only one of them is in the headline.
At $3,655 a year of real difference, 10 years in South Dakota instead of Kentucky is worth $36,546 in today's purchasing power — before compounding anything you might invest it in.
The line starts below zero because moving costs about $15,000 and lands entirely in year one. It takes until year 5 for the move to pay for itself. That is the figure a per-year comparison hides.
And it is slower to arrive than the annual figure suggests. Reckoning $15,000 for removal, fees and the cost of selling — an assumption this page makes, not a figure from a source — at $3,655 a year it takes 4.1 years to recover — so the annual figure only becomes yours from year 6.
At three horizons: $10,964 over three years, $36,546 over 10, $109,638 over thirty — and the three-year figure does not clear the cost of getting there.
None of those figures contains the one variable that could overturn them: the same job rarely pays the same in Kentucky and South Dakota. That is what the $95,397 break-even above is for — it prices an offer instead of assuming the offer is identical.
Choosing the county matters more than choosing the state here
This comparison is worth $3,655 a year. Choosing where inside South Dakota to live is worth $7,157 a year on the same $400,000 home — 2.0 times as much.
South Dakota has 65 counties and the effective property tax rate runs from 0.44% in Oglala Lakota County to 2.23% in Todd County. Move to the wrong county in the better state and you have given back more than the move gained you, twice over.
Which reframes the question. Rather than "Kentucky or South Dakota", the decision that carries the money is which county inside South Dakota — and the answer is not visible on any comparison that stops at the state line. Set both in the calculator above and every figure on this page recomputes on your actual rates rather than two medians.
The same logic applies to the losing side: Kentucky has counties cheaper than the median used here too, and for a reader who is staying put, moving county at home may be the better version of this decision.
You could take a $4,603 pay cut to move to South Dakota and be no worse off
That is the version of this comparison worth taking into a negotiation, and it is not a figure any tax calculator produces.
Matching your $100,000 standard of living in Kentucky takes $95,397 in South Dakota — 4.6% less than you earn now. So an offer of $95,397 is not a downgrade, and an offer above it is a raise however it looks on paper.
The reverse framing is the one recruiters use, and it is worth being able to answer: a company in Kentucky offering to match your current salary is offering you less than the South Dakota job at $95,397. On 10 years the difference is $36,546.
Where every number here comes from
Four sources, each read off the body that publishes it:
US Bureau of Economic Analysis — Regional Price Parities by State and Metro Area, 2024 (released 19 February 2026) — read 2026-09-08. https://www.bea.gov/data/prices-inflation/regional-price-parities-state-and-metro-area
IRS — Revenue Procedure for the tax year (federal brackets, standard deduction and FICA) — read 2026-09-02. https://www.irs.gov/
Each state's own department of revenue (state income tax rates and deductions), verified one state at a time — read 2026-09-02. https://estimatetax.net/sources/
US Census Bureau, American Community Survey (county effective property tax rates) — read 2026-08-31. https://data.census.gov/
The cost of living index is the part worth checking, because it is where comparison sites usually reach for something crowd-sourced. The Regional Price Parities are produced by the Bureau of Economic Analysis, cover every state and metro area, and are published with a methodology document. The figures here are the 2024 release and are not extrapolated forward.
And what this page does not model:
— The cost of living index is the BEA's Regional Price Parity for 2024, the most recent published. It is not extrapolated to the current year, and it is a state-wide average — inside a state, a metro area and a rural county differ by more than most state pairs do.
— Moving costs, state transfer taxes on buying a home, and the cost of selling the one you have are not included. On a short stay they can outweigh every annual difference on this page.
— Sales tax is not modelled. It is inside the BEA index — that is what a price parity measures — but it is not broken out separately here.
— The comparison assumes the same salary in both places unless you change it. In practice a job in a high-cost state usually pays more, which is exactly what the break-even figure is for.
— Health insurance, childcare and car insurance vary enormously by state and are only inside the index as averages. If any of the three is a large part of your budget, it deserves its own arithmetic.
Where to go next
Questions
- Is it cheaper to live in Kentucky or South Dakota?
- South Dakota, by $3,655 a year in real purchasing power on $100,000 with a $400,000 home. The take-home difference is only $1,944; the rest comes from the cost of living, where Kentucky indexes at 90.2 and South Dakota at 88.6 against a national average of 100.
- How much do I need to earn in South Dakota to match $100,000 in Kentucky?
- $95,397 — 4.6% less than you earn now, so a pay cut of up to $4,603 still leaves you level. That accounts for federal tax, FICA, state tax, property tax and the price level in each state.
- What are the taxes in Kentucky vs South Dakota?
- On $100,000: state income tax of $3,382 in Kentucky against $0 in South Dakota, and property tax of $2,872 against $4,310 on a $400,000 home at median county rates. Federal tax and FICA are identical in both — $13,170 and $7,650 — so any comparison showing a difference there is wrong.
- Does South Dakota really have lower property tax?
- That depends entirely on the county, which is why a state-level answer is not much use. South Dakota runs from 0.44% in Oglala Lakota County to 2.23% in Todd County — 5.1 times, or $7,157 a year on a $400,000 home. The median is 1.08%.
- How much is the difference over 10 years?
- $36,546 in today's purchasing power, at $3,655 a year. That excludes moving and housing transaction costs, which land in year one and can outweigh everything else on a short stay.
- Where does your cost of living data come from?
- The Bureau of Economic Analysis Regional Price Parities for 2024, an official index covering every state and metro area with a published methodology. Not a crowd-sourced database — and it comes broken into housing, goods, utilities and services, which matters because housing moves several times more than anything else.