What is the difference between federal and state income tax?

Federal income tax is collected by the IRS and uses 7 progressive brackets in 2026: 10%, 12%, 22%, 24%, 32%, 35%, and 37%. State income tax is collected by state revenue departments and varies dramatically: some states have no broad wage income tax, some use flat rates, and many use progressive brackets. Local income taxes can add a third layer in cities and counties that impose them.

Do I pay federal AND state income tax on the same income?

Usually yes. Federal tax, state tax, payroll tax, and sometimes local tax can apply to the same wages. Each jurisdiction starts from its own tax base and applies its own deductions, credits, brackets, and residency rules. A $100,000 salary in a no-income-tax state can therefore have a very different total burden than the same salary in a high-tax state.

Are federal and state tax deductions the same?

No. For tax year 2026, the federal standard deduction is $16,100 for single filers and married filing separately, $32,200 for married filing jointly, and $24,150 for heads of household. States set their own standard deductions, exemptions, credits, and conformity rules. Some states begin with federal AGI, while others make substantial additions and subtractions.

How does the SALT deduction interact with federal vs state taxes?

The State and Local Tax deduction lets federal itemizers deduct eligible state and local taxes on Schedule A. Under the One Big Beautiful Bill changes, the SALT cap is temporarily higher for 2025 through 2029; for 2026, IRS guidance describes a $40,400 cap ($20,200 for married filing separately), with a phase-down for taxpayers above the modified AGI threshold.

Which states have no income tax in 2026?

Nine states have NO state income tax for 2026: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, Wyoming. New Hampshire phased out its 5% interest/dividends tax (Tax Year 2024 was the last). Washington has a 7% tax on long-term capital gains over $250K (enacted 2022, upheld by the Washington Supreme Court 2023). Tennessee fully eliminated its 1% Hall Tax on interest and dividends in 2021.

Do I file separate federal and state tax returns?

Yes. You file Form 1040 with the IRS for federal, and your state-specific form (e.g., California Form 540, New York Form IT-201, Illinois Form IL-1040) with your state revenue department. Most states require you to file your federal return FIRST because state forms reference federal AGI as the starting point. Most tax software (TurboTax, H&R Block, FreeTaxUSA) auto-populates state forms from federal data.

What is a state tax reciprocity agreement?

Reciprocity agreements between certain states let residents of one state work in another and pay state income tax ONLY in their home state. For example: Pennsylvania has reciprocity with NJ, OH, IN, MD, VA, WV — a Pennsylvania resident working in New Jersey pays PA tax (3.07%) instead of NJ tax (up to 10.75%). Without reciprocity, you would pay tax to BOTH states then claim a credit on your home-state return. Major reciprocity pairs in 2026: PA-NJ, PA-OH, PA-IN, IL-IA, IL-WI, IL-KY, MD-DC, VA-WV, KY-IN, KY-OH, MN-ND, MI-OH, IN-OH, MI-IN.

How does Illinois income tax compare to federal?

Illinois uses a flat state income tax rate, while the federal system uses seven progressive brackets. Illinois has no federal-style standard deduction; federal taxable income for a single filer starts after the $16,100 federal standard deduction in 2026. A $100,000 Illinois single filer therefore combines federal tax, Illinois state tax, and FICA/payroll tax rather than paying only one income tax layer.

Why are state and federal tax brackets different?

States set their own tax policy — bracket counts, rates, and thresholds reflect each state legislature's priorities. Federal brackets are set by Congress in the Internal Revenue Code and adjusted annually by the IRS for inflation. State brackets often: (a) have fewer steps than federal (e.g., Pennsylvania flat 3.07%; California has 9 brackets), (b) have lower thresholds and start applying at lower incomes, (c) apply different inflation-adjustment formulas, and (d) may not adjust at all (Connecticut hasn't indexed brackets in years, creating "bracket creep"). Some states (CA, NY, NJ, OR) impose a millionaire surtax on income over $1M.

Federal vs State Income Tax 2026

Federal: 7 brackets, 10–37%. State: 51 different systems: no broad wage tax, flat tax, progressive brackets, plus local add-ons in some cities and counties. Both can apply to the same paycheck, but each system uses its own deductions, credits, residency rules, and filing mechanics.

Updated for tax year 2026. Federal brackets and standard deductions reflect IRS Rev. Proc. 2025-32 and One Big Beautiful Bill guidance. State figures should be verified against each state revenue department before filing.

The Quick Answer

Federal income tax applies to everyone in the United States with taxable income above the standard deduction ($16,100 single / $32,200 married filing jointly for 2026). State income tax depends on where you live: some states have no broad wage income tax, some use a flat rate, and many use progressive brackets. Both calculate tax on overlapping income, but each jurisdiction applies its own deductions, credits, and brackets independently.

2026 Federal Tax Brackets (Single Filer)

Marginal Rate	Income Range
10%	$0 – $12,400
12%	$12,401 – $50,400
22%	$50,401 – $105,700
24%	$105,701 – $201,775
32%	$201,776 – $256,225
35%	$256,226 – $640,600
37%	$640,601+

Federal standard deduction: $16,100 single or married filing separately / $32,200 MFJ / $24,150 HoH (2026, IRS Rev. Proc. 2025-32 and IRS OBBB guidance). Married Filing Jointly bracket thresholds are generally double the single thresholds until the top bracket.

State Income Tax: 3 Distinct System Types

1. No State Income Tax (9 states)

If you live in one of these states, your state income tax bill is $0:

Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, Wyoming. Caveat: Washington enacted a 7% tax on long-term capital gains over $250K (per individual, indexed) in 2022. New Hampshire fully eliminated its 5% interest/dividends tax after Tax Year 2024.

2. Flat-Rate States (12)

A single tax rate applies to all taxable income regardless of amount:

State	2026 Flat Rate	Standard Deduction (Single)
Arizona	2.50%	$15,000 (matches federal)
Colorado	4.40%	$0 (no state std ded)
Georgia	5.19%	$12,000
Idaho	5.30%	$15,000 (matches federal)
Illinois	4.95%	$0 (uses $2,775 personal exemption)
Indiana	3.00%	$1,000 personal exemption
Kentucky	4.00%	$3,270
Massachusetts	5.00% + 4% surtax over $1M	$0 ($4,400 personal exemption)
Michigan	4.25%	$5,800 personal exemption
Mississippi	4.40%	$2,300
North Carolina	4.25%	$12,750
Pennsylvania	3.07%	$0 (no state deductions)
Utah	4.55%	Modified federal AGI calc

3. Progressive-Bracket States (30 + DC)

Most states use multiple brackets like the federal system, but with widely varying top rates:

State	Top Marginal Rate (2026)	# Brackets
California	13.30% (over $1M, includes 1% mental health surtax)	10
Hawaii	11.00% (over $200K)	12
New York	10.90% (over $25M; lower brackets to 4%)	9
New Jersey	10.75% (over $1M)	7
Oregon	9.90% (over $125K, plus 0.1% transit tax)	4
Minnesota	9.85% (over $193,240)	4
Wisconsin	7.65% (over $315,310)	4
Iowa	5.70% — phasing to 3.9% flat by 2026	4
Connecticut	6.99% (over $500K)	7
Maryland	5.75% state + 1.25%-3.20% county add-on	8
Maine	7.15% (over $63,500)	3
Vermont	8.75% (over $237,950)	4
North Dakota	2.50% (lowest top in nation)	3
Delaware, Ohio, others	~4-6%	3-7

$100K Single Filer: 4 States Compared

State	Federal Tax	State Tax	FICA	Total Tax	Take-home
Texas	$13,170	$0	$7,650	$20,820 (20.8%)	$79,180
Florida	$13,170	$0	$7,650	$20,820 (20.8%)	$79,180
Illinois	$13,170	~$4,800	$7,650	~$25,620 (25.6%)	~$74,380
California	$13,170	Varies by CA adjustments	$7,650	Higher than no-tax states	Depends on CA return

The main gap is the state layer. A no-income-tax state still has federal tax and FICA, but no broad wage income tax on top. High-income-tax states can add thousands of dollars to the same $100K salary, while property tax, sales tax, and local tax can partially offset the headline income-tax difference. See total state tax burden ranking.

Deductions: Federal vs State Differ

Federal and state tax authorities each define their own deductions. Common divergence points:

Standard deduction: Federal $16,100 for 2026 single filers. State standard deductions vary widely; some states conform closely to federal rules, while others use state-specific deductions, exemptions, or no standard deduction.
SALT deduction: Federal itemizers can deduct eligible state and local taxes on Schedule A, subject to the 2026 cap and phase-down rules. State returns generally do not let you deduct the same state's income tax from that state's taxable income.
Mortgage interest: Federal capped at interest on $750K of acquisition debt (or $1M if loan originated before Dec 15, 2017). California does NOT honor the federal cap — full mortgage interest deductible at state level.
Retirement contributions: Federal allows pre-tax 401(k), traditional IRA, HSA. Most states honor these — but New Jersey taxes 401(k) and traditional IRA contributions at the state level (only Roth-equivalent is tax-free in NJ).
Federal-specific credits: Child Tax Credit, Earned Income Tax Credit (federal), American Opportunity Credit. States may offer parallel credits with different rules.

SALT Cap and Federal-State Interaction

The State and Local Tax (SALT) deduction lets federal itemizers deduct eligible state income tax or sales tax plus property tax on Schedule A. Under the One Big Beautiful Bill changes described by the IRS, the cap is temporarily higher for 2025 through 2029; for 2026, the cap is $40,400 ($20,200 for married filing separately), with a phase-down for taxpayers above the modified AGI threshold.

Practical impact: SALT mostly matters to itemizers in higher-tax states. A taxpayer who takes the standard deduction gets no separate SALT benefit, while a high-tax-state itemizer may recover more federal deduction value than under the old $10,000 cap, subject to the income phase-down.

Reciprocity Agreements (Cross-Border Workers)

If you live in one state and work in another, normally both states want to tax your wages. Reciprocity agreements eliminate this — you pay tax only to your home state.

Major 2026 reciprocity pairs:

Pennsylvania ↔ NJ, OH, IN, MD, VA, WV (PA has 6 reciprocity partners — most of any state)
Illinois ↔ IA, WI, KY, MI
Maryland ↔ DC, PA, VA, WV
Kentucky ↔ IN, OH, MI, VA, WI, IL, WV
Michigan ↔ IL, IN, MN, OH, WI
Indiana ↔ KY, MI, OH, PA, WI
Minnesota ↔ MI, ND
Virginia ↔ DC, KY, MD, PA, WV

Convenience of employer rule: NY, PA (Philadelphia), OH (Cincinnati, Cleveland, Columbus), and others tax non-resident workers if their employer is located there — even if they work remotely from home. This can override reciprocity in specific cases. Check your employer’s state rules.

Filing Mechanics

File federal first. Form 1040 with the IRS. Your federal AGI is the starting point for most state forms.
Determine residency status. Resident, part-year, or non-resident — defines which income is taxable in which state.
File your home state return. California Form 540, New York IT-201, Illinois IL-1040, etc.
Multi-state filers: If you worked in another state, file a non-resident return there first, then claim a credit on your home-state return for taxes paid to the work state (unless reciprocity applies).
Local returns: Some cities (NYC, Philadelphia, Detroit, San Francisco, Yonkers) require separate local income tax returns.

Calculate Your Combined Federal + State Tax

LevyIO’s state-specific calculators show federal + state + FICA combined:

Related Comparisons

Short-Term vs Long-Term Capital Gains 2026
Single vs Married Filing Jointly
1099 vs W-2 Tax
State Tax Comparison: Best & Worst States
Local Income Tax 2026 — Cities & States
Cost of Living: Atlanta vs SF vs NYC vs Seattle (Salario) — pairs with state-tax stacking analysis above
Best Mortgage Rates 2026 (Amortio) — federal mortgage interest deduction interaction

This guide is informational, not tax advice. State tax laws change frequently. Consult a CPA, enrolled agent, or your state revenue department for your specific situation. Last reviewed and verified May 13, 2026, against IRS Rev. Proc. 2025-32, IRS One Big Beautiful Bill guidance, and selected state revenue department sources.