Side-by-side tax comparison between Kentucky (3.5% top rate, flat) and Washington (no income tax). See which state lets you keep more at every salary level, and how cost of living changes the picture.
Washington has no state income tax, while Kentucky uses a flat system with rates of 3.5% flat. On a $100K salary, this creates a state tax difference of $3,500/year that Washington residents simply don’t pay.
Kentucky’s flat 3.5% rate means the gap scales linearly with income. At $200K, you’d save $7,000 by being in Washington instead.
Washington wins at 10 out of 10 salary levels tested. The advantage is consistent and significant across the income spectrum.
| Salary | Kentucky | Washington | Difference | Winner |
|---|---|---|---|---|
| $40K | $32,920 | $34,320 | +$1,400 | Washington |
| $50K | $40,605 | $42,355 | +$1,750 | Washington |
| $60K | $48,290 | $50,390 | +$2,100 | Washington |
| $75K | $58,913 | $61,538 | +$2,625 | Washington |
| $100K | $75,625 | $79,125 | +$3,500 | Washington |
| $120K | $88,995 | $93,195 | +$4,200 | Washington |
| $150K | $108,501 | $113,751 | +$5,250 | Washington |
| $200K | $141,887 | $148,887 | +$7,000 | Washington |
| $250K | $174,514 | $183,264 | +$8,750 | Washington |
| $300K | $204,829 | $215,329 | +$10,500 | Washington |
Take-home pay only tells part of the story. Kentucky has a cost of living index of 90 while Washington is at 110 (national average = 100).
This is a substantial difference. After adjusting for cost of living, $100K in Kentucky has purchasing power of $84,028 compared to $71,932 in Washington. Interestingly, Kentucky wins on purchasing power even though Washington has higher raw take-home pay. The cost of living difference more than offsets the tax advantage.
For a single earner at $100K filing jointly, take-home becomes $81,210 in Kentucky and $84,710 in Washington \u2014 a difference of $3,500. The gap remains similar regardless of filing status.
On paper, moving from Kentucky to Washington would save $3,500/year on a $100K salary, or $17,500 over 5 years. But relocation involves real costs: moving expenses, potentially buying/selling a home, changing jobs, and adjusting to a new community.
The $3,500/year savings is meaningful but probably not enough to justify a move on its own. However, combined with other factors like career growth, lifestyle preferences, or family proximity, it could tip the scale.