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Category Taxes & Contributions

Filing Status

Annual Gross Wages ($) W-2 wages before any deductions

Federal Deduction Type

Federal Itemized Amount ($)

CA Deduction Type

CA Itemized Amount ($)

Pre-Tax Deductions ($) 401(k), HSA, FSA contributions

Federal Tax Credits ($) Child Tax Credit, EIC, etc.

CA Tax Credits ($)

Total Withholdings Already Paid ($) Year-to-date tax already withheld

Enter your income details and press Calculate Taxes to see results.

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About

California imposes a progressive income tax with 9 brackets ranging from 1% to 12.3%, plus a Mental Health Services Tax of 1% on taxable income exceeding $1,000,000. Combined with federal income tax, FICA contributions, and California State Disability Insurance (SDI at 1.1%), total marginal rates can exceed 50% for high earners. Miscalculating withholdings leads to underpayment penalties assessed by the Franchise Tax Board (FTB) at a rate tied to the federal short-term rate plus 3 percentage points. This calculator applies 2024 tax year brackets, standard deductions, and FICA thresholds for all filing statuses.

The tool computes federal and California taxes independently using marginal bracket schedules, then layers FICA (Social Security capped at $168,600, Medicare at 1.45% with the Additional Medicare Tax of 0.9% above the statutory threshold) and SDI. It assumes wage income only. Self-employment, capital gains, and itemized California deductions (Schedule CA) require separate analysis. Results approximate liability under standard conditions and do not constitute tax advice.

Formulas

Tax liability is computed via marginal bracket summation. For a set of n brackets with thresholds t_i and rates r_i, total tax on taxable income I is:

T = n∑i=1 r_i ⋅ min(I − t_i−1, t_i − t_i−1)

Where T = total tax, I = taxable income (gross minus deductions), t_i = upper threshold of bracket i, r_i = marginal rate for bracket i. The summation halts when I falls within bracket i.

California Mental Health Services Tax adds:

T_MHS = 0.01 × max(0, I − 1,000,000)

FICA is computed as:

FICA = 0.062 ⋅ min(W, 168,600) + 0.0145 ⋅ W + 0.009 ⋅ max(0, W − M)

Where W = gross wages, M = Additional Medicare threshold ($200,000 single, $250,000 MFJ).

Effective tax rate:

R_eff = T_totalW × 100%

Reference Data

CA Bracket	Single Filer Range	MFJ Range	Rate
1	$0 - $10,412	$0 - $20,824	1%
2	$10,413 - $24,684	$20,825 - $49,368	2%
3	$24,685 - $38,959	$49,369 - $77,918	4%
4	$38,960 - $54,081	$77,919 - $108,162	6%
5	$54,082 - $68,350	$108,163 - $136,700	8%
6	$68,351 - $349,137	$136,701 - $698,274	9.3%
7	$349,138 - $418,961	$698,275 - $837,922	10.3%
8	$418,962 - $698,271	$837,923 - $1,396,542	11.3%
9	$698,272+	$1,396,543+	12.3%
MHS	Taxable income > $1,000,000 (all statuses)		+1%

Federal Bracket (2024)	Single Rate	MFJ Rate
$0 - $11,600 / $23,200	10%
$11,601 - $47,150 / $94,300	12%
$47,151 - $100,525 / $201,050	22%
$100,526 - $191,950 / $383,900	24%
$191,951 - $243,725 / $487,450	32%
$243,726 - $609,350 / $731,200	35%
$609,351+ / $731,201+	37%

Component	Rate	Wage Base / Threshold
Social Security (OASDI)	6.2%	$168,600
Medicare (HI)	1.45%	No cap
Additional Medicare	0.9%	$200,000 (S) / $250,000 (MFJ)
CA SDI	1.1%	No cap (2024)
Federal Standard Deduction (Single)	-	$14,600
Federal Standard Deduction (MFJ)	-	$29,200
Federal Standard Deduction (HoH)	-	$21,900
CA Standard Deduction (Single)	-	$5,540
CA Standard Deduction (MFJ)	-	$11,080
CA Standard Deduction (HoH)	-	$11,080
CA Personal Exemption Credit	-	$144 (S) / $288 (MFJ)

Frequently Asked Questions

The Mental Health Services Tax (Proposition 63) applies at 1% only to the portion of taxable income exceeding $1,000,000. It is not a cliff tax. An income of $1,050,000 incurs an additional $500 in MHS tax (0.01 × 50,000). This brings the top effective California marginal rate to 13.3%.

California maintains its own standard deduction schedule set by the Franchise Tax Board. For 2024, the CA single standard deduction is $5,540 compared to the federal $14,600. California also does not conform to many federal itemized deduction rules (e.g., no SALT deduction cap benefit since CA does not allow state tax deduction against itself). Always compute federal and CA taxable income separately.

Employers must withhold the 0.9% Additional Medicare Tax on wages exceeding $200,000 in a calendar year, regardless of filing status. However, the actual threshold for MFJ filers is $250,000 of combined wages. This means MFJ filers with individual wages under $200,000 but combined wages over $250,000 owe the tax at filing. Conversely, a single filer with wages of $210,000 has withholding on $10,000 but owes on the same amount.

Each employer withholds Social Security tax (6.2%) independently up to $168,600. If you earned $100,000 from two employers, you overpaid by 6.2% on $31,400 ($1,946.80). Claim the excess as a credit on your federal Form 1040. This calculator assumes a single employer.

Starting January 1, 2024, California eliminated the SDI taxable wage ceiling. The 1.1% rate now applies to all wages with no cap. Previously the cap was $153,164. High earners will see a significant increase in SDI withholding.

Head of Household status widens the federal bracket thresholds (approximately 33% wider than Single for lower brackets) and provides a larger standard deduction ($21,900 vs $14,600). California also provides HoH brackets that are wider than Single brackets. The combined effect reduces both federal and state tax. You must maintain a household for a qualifying dependent to claim this status.