Bottom line: Yes - moving from California to Colorado lowers your state income tax. On a $75,000 salary you would keep about $546 more per year.
| Salary (single) | California tax | Colorado tax | Difference |
|---|---|---|---|
| $50,000 | $1,291 | $1,505 | Pay $214 more |
| $75,000 | $3,113 | $2,567 | Save $546 |
| $100,000 | $5,438 | $3,630 | Save $1,808 |
| $150,000 | $10,088 | $5,755 | Save $4,333 |
| $250,000 | $19,388 | $10,005 | Save $9,383 |
California: California has the highest state income tax rate in the nation at 12.3%, plus a 1% mental health surcharge on income over $1 million.
Colorado: Colorado uses a flat tax rate of 4.25% applied to federal taxable income with state-specific modifications.
Your state income tax is set by where you are a resident, not where your employer is. To stop paying California tax you must genuinely establish residency in Colorado - register to vote, change your driver's license and car registration, move your primary home, and spend more than half the year there. High-tax states like California audit departing high earners, so keep records of your move date.
In the year you move you typically file a part-year resident return in both states: California taxes income earned while you lived there, Colorado taxes the rest. Remote workers should note that a handful of states tax income sourced to the state even for non-residents - check before assuming a clean break.
Colorado has a flat state income tax of 4.25%.
On a $75,000 single-filer salary, the state income tax difference is about $546/year (in your favor). Use the calculator for your exact income.
Once you establish residency in Colorado and break California residency, new income is taxed by Colorado. California can still tax income earned while you were a resident - file a part-year return for the move year.
California tax calculator · Colorado tax calculator · Paycheck calculator
Estimates use 2026 state brackets and the standard deduction for a single filer; they exclude local taxes, credits and federal tax. Verify with a tax professional before relocating.