Side-by-side tax comparison between Alaska (no income tax) and Idaho (5.3% top rate, flat). See which state lets you keep more at every salary level, and how cost of living changes the picture.
Alaska has no state income tax, while Idaho uses a flat system with rates of 5.3% flat. On a $100K salary, this creates a state tax difference of $5,300/year that Alaska residents simply don’t pay.
Idaho’s flat 5.3% rate means the gap scales linearly with income. At $200K, you’d save $10,600 by being in Alaska instead.
Alaska wins at 10 out of 10 salary levels tested. The advantage is consistent and significant across the income spectrum.
| Salary | Alaska | Idaho | Difference | Winner |
|---|---|---|---|---|
| $40K | $34,320 | $32,200 | −$2,120 | Alaska |
| $50K | $42,355 | $39,705 | −$2,650 | Alaska |
| $60K | $50,390 | $47,210 | −$3,180 | Alaska |
| $75K | $61,538 | $57,563 | −$3,975 | Alaska |
| $100K | $79,125 | $73,825 | −$5,300 | Alaska |
| $120K | $93,195 | $86,835 | −$6,360 | Alaska |
| $150K | $113,751 | $105,801 | −$7,950 | Alaska |
| $200K | $148,887 | $138,287 | −$10,600 | Alaska |
| $250K | $183,264 | $170,014 | −$13,250 | Alaska |
| $300K | $215,329 | $199,429 | −$15,900 | Alaska |
Take-home pay only tells part of the story. Alaska has a cost of living index of 127 while Idaho is at 95 (national average = 100).
This is a substantial difference. After adjusting for cost of living, $100K in Alaska has purchasing power of $62,303 compared to $77,711 in Idaho. Interestingly, Idaho wins on purchasing power even though Alaska 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 $84,710 in Alaska and $79,410 in Idaho \u2014 a difference of $5,300. The gap remains similar regardless of filing status.
On paper, moving from Idaho to Alaska would save $5,300/year on a $100K salary, or $26,500 over 5 years. But relocation involves real costs: moving expenses, potentially buying/selling a home, changing jobs, and adjusting to a new community.
With an annual savings of $5,300, the tax difference alone is significant enough to justify a move for many people — especially if career opportunities are comparable. At higher salaries, the savings grow even larger: a $200K earner would save $10,600/year.