Side-by-side tax comparison between Colorado (4.4% 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 Colorado uses a flat system with rates of 4.4% flat. On a $100K salary, this creates a state tax difference of $4,400/year that Washington residents simply don’t pay.
Colorado’s flat 4.4% rate means the gap scales linearly with income. At $200K, you’d save $8,800 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 | Colorado | Washington | Difference | Winner |
|---|---|---|---|---|
| $40K | $32,560 | $34,320 | +$1,760 | Washington |
| $50K | $40,155 | $42,355 | +$2,200 | Washington |
| $60K | $47,750 | $50,390 | +$2,640 | Washington |
| $75K | $58,238 | $61,538 | +$3,300 | Washington |
| $100K | $74,725 | $79,125 | +$4,400 | Washington |
| $120K | $87,915 | $93,195 | +$5,280 | Washington |
| $150K | $107,151 | $113,751 | +$6,600 | Washington |
| $200K | $140,087 | $148,887 | +$8,800 | Washington |
| $250K | $172,264 | $183,264 | +$11,000 | Washington |
| $300K | $202,129 | $215,329 | +$13,200 | Washington |
Take-home pay only tells part of the story. Colorado has a cost of living index of 105 while Washington is at 110 (national average = 100).
With similar costs of living (105 vs 110), the tax difference is the primary factor. What you see in raw take-home pay is essentially what you get in purchasing power: $71,167 in Colorado vs $71,932 in Washington.
For a single earner at $100K filing jointly, take-home becomes $80,310 in Colorado and $84,710 in Washington \u2014 a difference of $4,400. The gap remains similar regardless of filing status.
On paper, moving from Colorado to Washington would save $4,400/year on a $100K salary, or $22,000 over 5 years. But relocation involves real costs: moving expenses, potentially buying/selling a home, changing jobs, and adjusting to a new community.
The $4,400/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.