California to Mountain West Story Updated April 2026 Tax Foundation · BLS · ACS FinCalcs editorial

Cost of Living: Los Angeles vs Denver (2026)

California-to-Colorado migration is the third-largest tax migration corridor in 2026 — Colorado gained 11,341 net tax filers from interstate migration in 2022-2023. CA's 13.3% top + new 1.3% uncapped SDI vs CO's flat 4.4%. Not zero, but materially lower — and Colorado's flat structure is gentler than California's progressive bracket creep at higher incomes. Denver dominates aerospace, renewable energy, and a meaningful Boulder-corridor tech cluster. Cost of living favors Denver ~30%. Verdict at $200K: roughly $11,000/yr in Denver's favor — driven by tax + housing.

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The tax math nobody else shows you.

Three taxes that shape the real comparison. Sources cited inline.

State income tax

Los Angeles9.3%graduated 1%-13.3% + 1.3% SDI
Denver4.40%flat 4.4%

Denver wins on income tax — but the gap is smaller than CA-to-Texas/Florida. CA effective 9.0% + 1.3% SDI vs CO flat 4.4%. At $200K: LA ~$16,600/yr (state + SDI); Denver $8,800 → $7,800/yr Denver advantage. At $350K: LA ~$32,550/yr; Denver $15,400 → $17,150/yr Denver advantage. Compared to LA-Austin's $32K+/yr advantage at $350K, Denver's CO tax is meaningful — but Denver still saves ~$15K/yr at six figures, plus avoids CA's residency audit risk for high earners. Colorado's flat structure means HIGH earners pay the same 4.4% as middle-income — gentler than CA's progressive creep.

Source: CA FTB, CO DOR 2026 (Prop 121)

Property tax

Los Angeles1.1%1.10% effective (Prop 13 protected)
Denver0.51%0.51% effective

Denver wins decisively on property tax. CO 0.51% effective vs LA 1.10%. On equivalent $700K homes: LA ~$7,700/yr (new buyer) vs Denver ~$3,570/yr — $4,130/yr swing. Note: Denver reassesses every 2 years near market value; no Prop 13-style protection for long-term owners. New CA buyers benefit massively from moving; long-term LA owners with Prop 13 protection face neutral or worse property tax math.

Source: LA County Assessor, Arapahoe County Assessor 2026

Sales tax

Los Angeles combined9.5%9.5% combined
Denver combined8.11%8.11% combined

Denver's 8.11% combined sales tax is moderately lower than LA's 9.5%. On $75K of taxable spending, Denver saves $1,043/yr. CO state portion (2.9%) is the lowest in the US, but Denver's local addition stacks higher than expected. Both states exempt groceries.

Source: CA Board of Equalization, CO DOR 2026

The 30-second answer at $100K salary
Los Angeles
$5,683/mo take-home
42% goes to rent ($2,400/mo)
$3,283/mo left
Denver
$6,038/mo take-home
29% goes to rent ($1,770/mo)
$4,268/mo left
Annual difference: $11,820 in Denver's favor.

Take-home estimates use 2026 federal+state brackets, single filer. Excludes pre-tax deductions and 401(k). Source: Tax Foundation, IRS 2026 brackets.

Try it with your salary.

Drag either slider. Both sides update with after-tax dollars and rent percentages calculated live.

Los Angeles, CA
$100,000
Take-home/month$5,913
Rent (1BR)$1,900 (40%)
Disposable/mo$4,013
Denver, CO
$81,000
Take-home/month$6,321
Rent (1BR)$1,500 (24%)
Disposable/mo$4,821
If you earn $100,000 in Los Angeles, you only need $81,000 in Denver to maintain the same disposable income.
Run my full take-home calc →

The full breakdown — including taxes.

The current Los Angeles-vs-Denver comparisons online skip taxes entirely. They're the biggest variable. Here's everything.

Category Los Angeles Denver Difference Why
Housing (2BR rent) $2,800/mo $2,050/mo -27% Denver ~27% cheaper rent
State income tax + SDI (on $200K) $16,600/yr $8,800/yr -$7,800 CA effective 9% + SDI vs CO flat 4.4%
Property tax (on $700K home) $7,700/yr $3,570/yr -$4,130 LA 1.10% (new buyer) vs Denver 0.51%
Sales tax (on $75K taxable spending) $7,125/yr $6,083/yr -$1,042 LA 9.5% vs Denver 8.11%
Groceries (weekly) $145/wk $110/wk -24% Denver ~24% cheaper
Transportation (yearly) $8,400/yr $6,800/yr -$1,600 Lower CO gas prices ($3.20/gal vs $4.80/gal LA); Denver RTD ~$99/mo

Lower CO gas prices ($3.20/gal vs $4.80/gal LA); Denver RTD ~$99/mo

What if you bought instead?

Live mortgage rate from Freddie Mac PMMS, week of 2026-04-21. Adjust the down payment to see real PITI for both cities.

20% — $72,000 (Los Angeles) / $66,000 (Denver)
Los Angeles
Median home$920,000
Mortgage (P+I)$1,800/mo
Property tax$537/mo
HO insurance$200/mo
Total PITI$2,454/mo
5-yr equity + appreciation+$84,200
30-yr wealth+$612K
Denver
Median home$575,000
Mortgage (P+I)$1,650/mo
Property tax$388/mo
HO insurance$175/mo
Total PITI$2,213/mo
5-yr equity + appreciation+$71,400
30-yr wealth+$498K
Denver has been appreciating faster (5.7% vs 4.1% historical 5-year), making it the wealth-building winner short-to-medium term. Long-term forecasts depend on local fundamentals.

Break-even on moving costs

If Denver wins by ~$985/month, how long until the move pays itself back?

$4,200
Break-even:
4 months
At $985/mo advantage to Denver, a $4,200 move pays back in ~4 months. After that, you keep the savings.

Move cost source: Average household move cost LA↔Denver (~1,015 miles) per AAA 2026. Excludes lost work time, deposits, broker fees.

Mortgage rates: 30-year 6.37%, 15-year 5.65%. LA: rising due to wildfire exposure; State Farm and Allstate stopped writing new policies in fire-prone areas. Denver: hail damage drives premiums higher than typical Mountain West (Colorado has highest hail-damage insurance claims in US — frequent severe summer hail). Appreciation projection uses 3% conservative forward estimate. Past performance not indicative of future returns.
Run mortgage affordability for both cities →

By the numbers.

Quotable stats that make the comparison concrete.

13.3% + 1.3%
California top wage tax + SDI
Highest in US
4.4%
Colorado flat tax rate
Flat — same at all incomes
~$89,000
Annual savings at $1M LA→Denver
CO flat vs CA progressive
+11,341
Colorado net migration 2022-2023
8th-largest US gain
$575K
Denver median home price
vs LA's $920K
280,000+
Colorado aerospace workers
#2 in US, #1 per capita

Why this comparison matters in 2026.

The macro picture before the math.

The Los Angeles to Denver migration is the third-largest tax migration corridor in 2026 — Colorado gained 11,341 net tax filers from interstate migration in 2022-2023, ranking 8th nationally. While not as dramatic as the LA-to-Texas or LA-to-Florida flows, the LA-to-Denver corridor captures a different demographic: aerospace engineers, renewable energy professionals, mountain-lifestyle seekers, and high earners attracted by Colorado's flat tax structure. The decision rarely turns purely on tax savings — it's about California's progressive bracket creep meeting Colorado's flat rate stability, plus genuinely different lifestyle offerings.

California's tax burden is the headline. Top marginal rate of 13.3% — highest of any state — plus the new uncapped 1.3% State Disability Insurance tax (effective 2024 under SB 951). At $200K wages, LA pays $16,600/yr in state income tax + SDI; Denver pays $8,800. At $350K: $32,550 vs $15,400. At $1M: $133,000 vs $44,000 — $89,000/yr Colorado savings driven entirely by Colorado's flat 4.4% vs California's progressive top. While Texas and Florida offer larger absolute savings (0% vs CA's 13.3%), Colorado captures roughly 70% of the LA-to-Texas tax savings while providing different climate and lifestyle. For high earners specifically, Colorado's flat structure is gentler than progressive states because high incomes don't trigger bracket creep.

Colorado's economic identity differs sharply from LA's. While LA dominates entertainment, aerospace, and Pacific Rim trade, Colorado anchors aerospace + renewable energy + Mountain West outdoor recreation. Aerospace cluster: 280,000+ workers, second only to California in absolute employment and #1 per capita. Lockheed Martin Space (Littleton), United Launch Alliance HQ (Centennial), Ball Aerospace (Boulder, acquired by BAE Systems 2024), US Space Command HQ relocated to Colorado Springs in 2023. Renewable energy: NREL (National Renewable Energy Laboratory, Golden CO) is the world's premier renewable energy research center, anchoring 800+ Colorado clean tech companies. Boulder-Denver tech corridor includes Twilio, Cloudflare, Snowflake, plus 1,500+ startups. For LA transplants in aerospace, defense, renewable energy, or tech, Colorado offers genuine career corridors with lower cost of living.

Cost of living delta is meaningful but not as dramatic as LA-to-Texas. Denver median home price $575K vs LA $920K — $345K cheaper. 2BR rent $2,050 vs $2,800 (~27% lower). Bureau of Economic Analysis Regional Price Parities show Denver at 103% of national average vs LA at 112%. The 2026 verdict at $200K wages shows ~$11,000-$13,000/yr in Denver's favor — driven by tax + housing savings, partially offset by Denver's surprisingly high hail insurance costs. For most career trajectories outside entertainment and Pacific Rim trade, Denver wins on financial math. The lifestyle decision (Mediterranean coast vs Mountain West) often dominates in practice — especially for outdoor-priority movers.

Five things that surprise people.

The framings most cost-of-living tools never mention. All sourced.

Colorado's flat tax structure benefits high earners more than headline rates suggest.

Colorado's flat 4.4% applies regardless of income — a $50K earner pays the same rate as a $5M earner. California's progressive structure means top earners pay 13.3% on income above $1M (plus 1% mental health services tax — effective 14.4%). For a $1M earner: CA pays ~$133,000 in state tax; CO pays $44,000 → $89,000/yr Colorado savings on $1M income. Compare to LA-Austin where the gap at $1M is ~$133,000 (Texas 0%). Colorado captures roughly 70% of the LA-to-Texas tax savings while offering different lifestyle/climate. For mid-six-figure earners weighing climate preferences, Colorado is often the under-appreciated middle option.

Source: Colorado Department of Revenue, CA FTB →

Colorado voters reduced state income tax twice in 6 years — 4.63% → 4.55% → 4.40%.

Colorado voters approved Proposition 116 (2020) reducing flat tax from 4.63% to 4.55%, then Proposition 121 (2022) further reducing to 4.40% (effective 2025). The state has direct-democracy mechanisms making tax increases structurally difficult — TABOR (Taxpayer's Bill of Rights, 1992) requires voter approval for tax increases. While CA's tax burden grew worse in 2024 (uncapped SDI), CO's tax burden has shrunk 5% since 2020. The trend lines are pointing in opposite directions for these two states.

Source: Colorado Secretary of State Election Returns, Colorado Department of Revenue →

Colorado gained 11,341 net tax filers from interstate migration in 2022-2023 — among top US states.

IRS Statistics of Income state migration data show Colorado as the 8th-largest net gainer of tax filers in 2022-2023 (+11,341), trailing only Texas, Florida, NC, SC, Tennessee, Arizona, and Georgia. The migration is not just retirees — Colorado attracts working-age California exiles in tech, aerospace, and renewable energy. Boulder corridor (30 minutes north of Denver) hosts 20+ federal labs (NIST, NOAA, NREL) plus tech (Twilio, Cloudflare, Snowflake have Boulder/Denver offices). Colorado's tech employment grew 22% from 2018-2023 — significant though smaller than Texas's 41%.

Source: IRS Statistics of Income State Migration Data 2022-2023 →

Colorado's hail damage drives surprisingly high homeowner and auto insurance — rivaling Florida.

Colorado has the highest hail-damage insurance claims in the US. Severe summer hail (golf-ball to baseball-sized) damages roofs, vehicles, and skylights annually. Auto insurance premiums in some South Denver zip codes now exceed California equivalents. Homeowner insurance averages $2,000-$2,800/yr vs $1,400-$1,800 in similar non-hail markets. While CA wildfire risk is more catastrophic, CO hail risk is more frequent — most Denver homeowners file claims every 5-7 years. New residents are surprised by 'roof replacement' becoming a routine homeowner cost.

Source: Insurance Information Institute, Rocky Mountain Insurance Information Association →

Denver-Boulder is the second-largest aerospace cluster in the US — and growing.

Colorado has 280,000+ aerospace workers — second only to California in absolute employment, and #1 per capita. Major employers: Lockheed Martin Space (Littleton), United Launch Alliance HQ (Centennial), Ball Aerospace (Boulder, acquired by BAE Systems 2024), Maxar Technologies, Sierra Space, plus 5,000+ aerospace startups. US Space Command HQ relocated to Colorado Springs (2023). For aerospace careers, Denver-Boulder rivals LA's aerospace presence (Lockheed Skunk Works, Boeing, JPL, Aerospace Corp). The 2024 Ball Aerospace acquisition by BAE consolidated Colorado's defense aerospace position. Tax + climate + cost combine to make Colorado increasingly attractive vs LA for aerospace workers.

Source: Colorado Office of Economic Development and International Trade, Aerospace Colorado →

Which city is right for you?

Five questions. Tax + COL favor Denver; lifestyle and career sector cut differently.

1 of 5
Career sector
2 of 5
Income level
3 of 5
Climate preference
4 of 5
Outdoor lifestyle
5 of 5
What matters most

Which one wins for who?

The right answer depends on career sector, income, and lifestyle priorities:

Reader profile Winner Confidence Why
Single, $80K, renting Denver High $10K+/yr COL + tax savings
Entertainment / film professional Los Angeles Very High Industry concentration unmatched
Aerospace engineer Denver Moderate Comparable industry, lower cost; LA depth still wins for some niches
Renewable energy / clean tech Denver Very High NREL + 800+ CO clean tech firms
Tech professional, $200K Denver High $8K/yr tax + $4K property + $20K housing savings
$500K+ earner Denver Very High CO flat tax saves $40K+/yr
$1M+ earner Denver Very High CO flat tax saves $89K/yr
Couple, $250K, planning to buy Denver High $345K cheaper home + lower tax
Long-term LA owner (Prop 13 protected) Los Angeles High Property tax protection outweighs tax delta
Mountain / outdoor / skiing priority Denver Very High 26 ski resorts within 3 hours
Beach / ocean priority Los Angeles Very High Denver landlocked at 5,280 ft
Climate-sensitive (heat-averse, sun priority) Denver Moderate 300 sunny days but cold winters

Confidence is editorial judgment, not a precise statistical estimate. "Very High" = the math is decisive; "Low" = the answer depends heavily on factors specific to your situation.

When the standard verdict flips.

Tax + COL math favors Denver decisively. Specific situations strongly favor LA:

Los Angeles becomes the better choice if:
  • Career in entertainment, film, TV, or talent representation
    LA hosts Disney, Warner, Paramount, Sony, Universal studios + CAA, WME, UTA agencies. Industry depth in 700,000+ entertainment jobs is genuinely irreplaceable. Denver has emerging film tax credit programs (Colorado expanded film incentives in 2023) but 1/100th LA's scale.
  • Beach / ocean / Pacific lifestyle priority
    LA's Pacific Ocean access, year-round mild climate, and beach culture are genuinely irreplaceable. Denver has lakes (Lake Dillon, Cherry Creek Reservoir) and rivers but landlocked at 5,280 ft elevation. For ocean-priority lifestyle, LA wins decisively.
  • Pacific Rim trade / international business
    Port of LA + Long Beach handle 40% of US imports from Asia. For international trade, especially with Asia, LA is structurally required. Denver is landlocked, fundamentally domestic.
  • Long-term LA owner protected by Prop 13
    If you bought before 2010, Prop 13 has capped your property tax at 2%/year — you may pay $20,000+/yr below current market. Selling means losing this protection forever. Denver reassesses every 2 years near market — no equivalent protection. Long-term LA owners often face worse total cost in Denver despite tax savings.
Denver becomes the better choice if:
  • Wage earner $200K+ avoiding CA tax + SDI
    Colorado's flat 4.4% vs CA's 9-13.3% top + uncapped SDI saves $7,800/yr at $200K, $17,150/yr at $350K, $89,000/yr at $1M. Combined with 30% lower COL, Denver provides meaningful financial efficiency vs LA at every income level.
  • Career in aerospace, defense, or US Space Force
    Colorado has 280,000+ aerospace workers (#2 in US). Lockheed Martin Space (Littleton), United Launch Alliance HQ (Centennial), Ball Aerospace (Boulder, acquired by BAE 2024), US Space Command HQ (Colorado Springs). For aerospace careers, Denver-Boulder rivals LA — and the cost differential makes Colorado increasingly attractive.
  • Career in renewable energy or clean tech
    NREL (National Renewable Energy Laboratory, Golden CO) is the world's premier renewable energy research center. Plus 800+ Colorado clean tech companies. For solar, wind, battery storage, hydrogen careers, Denver is structurally distinctive — LA has the manufacturing market but Colorado has the research center and policy infrastructure.
  • Outdoor lifestyle / mountain / skiing priority
    Denver has 26 ski resorts within 3 hours, 14ers (mountains over 14,000 ft) accessible, and 300+ sunny days. Rocky Mountain National Park 90 minutes away. For mountain lifestyle, Denver is unmatched among major US metros.

What you are accepting either way.

Both cities have real downsides. Here's what you're accepting:

If you choose Los Angeles, you are accepting:
  • California tax burden grew worse in 2024. Top 13.3% + uncapped 1.3% SDI. At $500K: $50K+/yr more in CA tax than CO equivalent.
  • Wildfire insurance crisis. Major insurers stopped writing policies in fire-prone areas. FAIR Plan tripled enrollment.
  • Worst US traffic. 47-minute average commute. Multi-hour commutes typical for non-central living.
  • Highest US housing costs. $920K median home vs Denver's $575K — $345K more debt for equivalent property.
  • Earthquake risk. San Andreas + Hayward faults. Major earthquake (M7+) statistically overdue.
If you choose Denver, you are accepting:
  • Cold winters with 157 days below freezing/yr. Snow, ice storms, heating costs. Real lifestyle change from LA's Mediterranean climate.
  • Hail insurance is expensive and rising. Most Denver homeowners file claims every 5-7 years. Auto insurance in some zip codes exceeds CA equivalents.
  • Altitude impact. 5,280 ft elevation affects sleep, exercise capacity for first 6-12 months. Some never fully adapt.
  • Limited transit + sprawl. RTD covers Denver core but suburbs require car. Boulder-Denver corridor congestion increasing.
  • Career narrowness in entertainment. If you're in film/TV, Denver's industry is meaningful but tiny vs LA. Most actor/writer/director jobs require LA presence.

How sensitive is this answer? Highly — career sector and income level dominate.

  • Change career sector from generic to entertainment: LA wins decisively.
  • Change career sector to aerospace: roughly tied (both top US clusters); cost favors Denver.
  • Change career sector to renewable energy: Denver wins (NREL + policy ecosystem).
  • Change income from $200K to $1M: Denver advantage grows from $7,800 to $89,000/yr (CA progressive top vs CO flat).
  • Account for Prop 13: long-term LA owners may face worse net math in Denver despite tax savings.

Take this further.

Three tools that turn this comparison into a plan.

Take the next step.

Calculators and tools that extend this comparison with your specific numbers.

Methodology & sources

Page last reviewed: 2026-04-25. Next scheduled update: 2026-07-15.

Take-home pay calculations use 2026 federal tax brackets (single filer, standard deduction) plus the relevant state rate. They exclude pre-tax retirement contributions (401(k), HSA, FSA) and most local taxes that vary by employer.

Cost-of-living indexes use ACER (American Chamber of Commerce Researchers) and BLS regional CPI as primary sources, weighted across housing, groceries, utilities, transportation, healthcare, and miscellaneous categories.

Property tax figures are effective rates (median bill ÷ median home value) at the county level. They differ from nominal/posted millage rates because of homestead exemptions and assessment caps.

Mortgage projections assume 30-year fixed at the rate shown, conservative 3% annual appreciation, and standard PITI calculations. Past appreciation does not guarantee future returns.

Sources used in this comparison:

  • Tax Foundation 2026
  • CA Franchise Tax Board 2026
  • Colorado Department of Revenue 2026
  • LA County Assessor 2026
  • Arapahoe County Assessor 2026
  • BLS Q1 2026
  • ACS 5-Year 2024
  • Zillow Home Value Index April 2026
  • Numbeo COL Plus Rent Index 2026
  • IRS Statistics of Income state migration 2022-2023
  • Bureau of Economic Analysis Regional Price Parities 2026

All figures are estimates for general planning. Your specific situation depends on filing status, dependents, deductions, employer benefits, and neighborhood-specific costs. Use the linked FinCalcs tools for personalized calculations. Not financial or tax advice.

Frequently asked questions.

Real questions readers ask about Los Angeles vs Denver.

How much do you save moving from LA to Denver on $200K?
Approximately $11,000-$13,000/yr at $200K wages: ~$7,800/yr in tax savings (CA effective 9% + 1.3% SDI vs CO flat 4.4%) plus ~$3,000-$5,000/yr in lower cost of living. At $350K: tax savings alone exceed $17,000/yr. At $1M+: ~$89,000/yr just in state tax savings (CO's flat 4.4% vs CA's progressive 13.3% on top brackets). The advantage scales aggressively at higher incomes — Colorado's flat structure is especially favorable for high earners.
Why does Colorado have a flat tax instead of progressive?
Constitutional and political design. Colorado's flat tax dates to 1987 (replacing the previous graduated system). The state's Taxpayer's Bill of Rights (TABOR, 1992) requires voter approval for any tax increases — making a return to progressive brackets politically very difficult. Voters have actually REDUCED the flat rate twice since 2020 (Prop 116 dropped 4.63%→4.55% in 2020; Prop 121 dropped to 4.40% effective 2025). The trend is rate reduction, not increase. For high earners in particular, Colorado's flat structure offers protection from progressive bracket creep that California subjects high earners to.
Is Denver-Boulder really an aerospace hub?
Yes, the second-largest in the US. Colorado has 280,000+ aerospace workers — second only to California in absolute employment, #1 per capita. Major employers: Lockheed Martin Space (Littleton), United Launch Alliance HQ (Centennial), Ball Aerospace (Boulder, acquired by BAE Systems 2024), Maxar Technologies, Sierra Space, plus US Space Command HQ relocated to Colorado Springs in 2023. For aerospace engineering, satellite operations, defense space programs, Denver-Boulder is genuinely competitive with LA — and the cost differential makes Colorado increasingly attractive for aerospace workers leaving California.
How bad are Colorado winters compared to LA?
Significantly different climate. Denver has 157 days below freezing per year vs LA's 0 days below freezing. Snow events occur monthly Nov-April. Heating costs add $80-$150/mo to utility bills vs LA's nearly zero heating need. However, Denver also has 300+ sunny days/yr (more than LA's 284), low humidity, and milder summers (avg high 88°F vs LA's 84°F — but Denver lower humidity feels cooler). For LA transplants, the winter cold and snow shoveling are real lifestyle changes. Many adapt but some never do.
Does Colorado really have hail insurance issues?
Yes. Colorado has the highest hail-damage insurance claims in the US. Severe summer hail (golf-ball to baseball-sized) damages roofs, vehicles, and skylights every summer. Most Denver homeowners file insurance claims every 5-7 years. Auto insurance premiums in some South Denver zip codes now EXCEED California equivalents. Homeowner insurance averages $2,000-$2,800/yr in Denver vs $1,400-$1,800 in similar non-hail markets. Denver homeowners learn to plan for periodic roof replacement as a routine cost — uncommon in LA.
What's the Boulder-Denver tech corridor like?
Strong but smaller than Bay Area or Austin. Boulder (30 min north of Denver) hosts NIST, NOAA, NREL labs plus tech offices for Twilio, Cloudflare, Snowflake, ProtonMail, Zayo Group. Denver itself has IBM, Oracle, Comcast Tech Center, and 1,500+ tech startups. Colorado tech employment grew 22% from 2018-2023 — meaningful though smaller than Texas's 41%. For LA tech workers, Boulder-Denver offers a real career corridor with mountain lifestyle and lower cost of living. Not Bay Area density but a genuine alternative.
Can I keep my California job and pay Colorado taxes?
Yes if you actually move. If you work remotely for a California employer from Colorado, you pay Colorado income tax (not California's) — assuming your residency is genuinely Colorado. Important caveat: California's Franchise Tax Board aggressively audits residency departures (520 audits in 2023). Triggers include continued CA real estate, family ties, professional licenses. You must establish Colorado domicile cleanly: lease/buy in CO, register vehicle (within 90 days), get CO driver's license, register to vote, sever clearly continuous CA presence (under 183 days/yr). Done correctly, you pay CO 4.4% instead of CA's 13.3%+ — major savings. Done sloppily, you owe CA tax for years after the move.