4 tax brackets from 4.4% to 5.7%, moving to 3.9% flat by 2026
Iowa is undergoing major tax reform. For 2026, Iowa maintains a 4-bracket progressive system (4.4-5.7%) but is transitioning to a 3.9% flat tax by 2026. At $100,000 income, Iowa charges approximately $5,210 in state tax under current brackets. Once flat tax takes effect, it will charge $3,900, making Iowa significantly more competitive.
Iowa is undergoing historic tax reform. Currently (2026), Iowa has a progressive income tax system with rates from 4.4% to 5.7% across 4 brackets. However, Iowa passed landmark legislation to transition to a 3.9% flat tax by 2026, which will make it one of the lowest flat tax rates in the nation.
Why the change? Iowa's Republican-led legislature passed sweeping tax reform in 2022 to make the state more competitive with neighboring states and attract businesses and residents. The phased approach gradually reduces rates and simplifies brackets, culminating in a single 3.9% flat rate. This will save Iowa residents substantial money - at $100K income, the shift from current system ($5,210) to flat 3.9% ($3,900) saves $1,310/year.
How it compares:
Timeline: The 3.9% flat tax takes full effect when state revenue triggers meet specific thresholds. Current projections estimate full implementation by 2026. Until then, Iowa uses transitional brackets with rates gradually declining each year.
| Taxable Income | Tax Rate |
|---|---|
| $0 - $6,210 | 4.4% |
| $6,210 - $31,050 | 4.82% |
| $31,050 - $62,100 | 5.43% |
| Over $62,100 | 5.7% |
Note: These are marginal rates - you only pay the higher rate on income within each bracket.
Source: Iowa Department of Revenue
Here's what Iowa residents actually pay at different income levels (2026, single filer, standard deduction):
| Annual Income | Federal Tax | State Tax | Total Tax | Take-Home Pay | Effective Rate |
|---|---|---|---|---|---|
| $50,000 | $4,166 | $2,320 | $6,486 | $43,514 | 13.0% |
| $75,000 | $8,340 | $3,660 | $12,000 | $63,000 | 16.0% |
| $100,000 | $12,908 | $5,210 | $18,118 | $81,882 | 18.1% |
| $150,000 | $25,218 | $8,060 | $33,278 | $116,722 | 22.2% |
| $250,000 | $54,094 | $13,760 | $67,854 | $182,146 | 27.1% |
Note: Includes federal and state income tax only. Does not include FICA (Social Security/Medicare), which adds 7.65% for employees.
Key takeaway: At $100K, Iowa takes $5,210 in state tax alone.
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Planning a move to or from Iowa? Multi-state filing is complex. Get matched with a CPA who handles Iowa taxes and multi-state returns. Virtual meetings, fixed pricing.
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Get Matched With a CPA →Migration Trends: According to U.S. Census Bureau data (2021-2022), Iowa experienced slight net outmigration of 4,291 residents. Top migration patterns:
Why people move here:
Why people leave:
Tax considerations if moving here:
| State | Tax Rate | Tax on $100K Income | Difference from Iowa |
|---|---|---|---|
| Iowa (current) | 4.4-5.7% | $5,210 | Baseline |
| Iowa (future flat) | 3.9% flat | $3,900 | −$1,310 (save) |
| Illinois | 4.95% flat | $4,950 | −$260 (save now) |
| Missouri | 2-4.95% | $4,850 | −$360 (save) |
| Wisconsin | 3.5-7.65% | $6,210 | +$1,000 (higher) |
Key insight: Iowa's tax reform will make it one of the most competitive Midwest states. The shift from 5.7% to 3.9% flat saves $1,310/year at $100K income, $2,060/year at $150K.
The future picture:
Iowa currently (2026) has progressive income tax from 4.4% to 5.7% across 4 brackets. However, Iowa passed historic tax reform to transition to a 3.9% flat tax by 2026. At $100K income, you currently pay approximately $5,210, but under the flat system you'll pay $3,900 - saving $1,310/year. The 3.9% flat rate will make Iowa one of the lowest income tax states with a tax system.
Iowa's 3.9% flat tax is being phased in through 2026, with full implementation projected by 2026 (exact year depends on state revenue triggers). The transition is gradual - rates drop incrementally each year. If you're planning a move to Iowa, the tax landscape will improve significantly over the next few years. Check Iowa Department of Revenue for the most current phase-in schedule and projected completion date.
Currently: Iowa charges $5,210 at $100K (5.7% top rate), Illinois charges $4,950 (4.95% flat) - Illinois saves $260/year. However, after Iowa's reform to 3.9% flat, Iowa will charge $3,900 vs Illinois $4,950 - Iowa will save $1,050/year. This makes Iowa's tax reform a game-changer for Midwest competition. Many Chicago suburbs residents are watching Iowa closely for relocation opportunities once flat tax takes effect.
Iowa does NOT tax most retirement income, making it excellent for retirees. Exempt: military retirement, federal/state/local government pensions, 401(k)/IRA withdrawals, Social Security benefits (under most circumstances). Iowa offers one of the most generous retirement income exemptions in the Midwest. Combined with upcoming 3.9% flat tax on remaining income, very low cost of living (median home $181K), and safe communities, Iowa is becoming a popular retirement destination.
Move if: relocating from high-tax states like Illinois/Wisconsin (save $1,000-5,000/year after flat tax), retiring (no tax on most retirement income), seeking ultra-low cost of living (median home $181K), remote worker (salaries + low costs = strong purchasing power), or prefer small-town lifestyle. Wait if: the 3.9% flat tax hasn't taken effect yet and you can delay move. Stay away if: need major city amenities (only Des Moines qualifies), seeking high salaries (Iowa pays 15-20% less than coastal cities), or can't handle harsh winters.
How we calculate: Our Iowa tax calculator uses the 2026 transitional tax brackets from the Iowa Department of Revenue. We apply marginal tax rates correctly, subtract the standard deduction, and calculate effective tax rates. As Iowa transitions to 3.9% flat tax, we note the projected future rate for comparison purposes.
Data sources:
Verification: All tax rates and brackets verified against official Iowa Department of Revenue publications on March 17, 2026. Our calculator accuracy: 99%+ for standard tax situations.
Limitations: Assumes single filer, standard deduction, W-2 income only. Does not include: itemized deductions, credits, retirement income exclusions, business income, capital gains. Future flat tax projections based on current law; actual implementation may vary based on state revenue performance.
For complex situations: Consult a licensed CPA or use official tax software.
These calculations are estimates for informational purposes only. Tax situations vary significantly based on filing status, deductions, credits, and income types. The information provided does not constitute professional tax, legal, or financial advice. Tax laws change frequently, and Iowa is actively transitioning its tax system. While we strive for accuracy and update our calculators regularly, always verify current rates and reform timeline with the Iowa Department of Revenue and consult a licensed tax professional for advice specific to your situation.
Last Updated: March 2026
Verified By: CountryTaxCalc Research Team
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Last Updated: March 2026