When Is Health Insurance Tax Deductible in California?

Health insurance premiums are tax deductible in California, but how you claim them depends on how you earn your income. If you’re self-employed, you can subtract premiums directly from your gross income without itemizing. Everyone else has to itemize and clear a 7.5%-of-income threshold before any premium dollars reduce their tax. California also taxes Health Savings Account activity that the federal government leaves alone, which quietly erodes the deduction picture for anyone contributing to an HSA.

If You’re Self-Employed

Self-employed filers get the most valuable version of this deduction. Instead of waiting to clear a percentage-of-income floor, you subtract your health insurance premiums directly from gross income as an above-the-line deduction. It reduces your adjusted gross income on both your federal and California returns, and you don’t need to itemize to take it.¹

Three conditions have to be met:

Your business must show a net profit for the year. A loss year disqualifies the deduction.¹
The deduction can’t exceed your earned income from the business that sponsors the plan.²
You can’t claim it for any month you were eligible to participate in a health plan through your own or your spouse’s employer.²

The policy covers you, your spouse, and your dependents. It also extends to your children under age 27 even if they aren’t your dependents for tax purposes.¹ A 25-year-old who files her own return can still be on the policy you’re deducting. The insurance has to be established under your business or in your name as the business owner.

Medicare Premiums

If you’re self-employed and on Medicare, premiums for Parts A, B, C, and D all qualify for the same above-the-line deduction. The earned-income cap still applies. One quirk catches people off guard: the deduction reduces your income tax, but it doesn’t reduce your self-employment tax.²

Covered California Subsidies Reduce the Amount

If you bought coverage through Covered California and received advance premium tax credits that lowered your monthly bill, you can only deduct what you actually paid out of pocket, not the full sticker premium. You reconcile the credits by filing Form 8962 with your federal return.³ If the advance payments exceeded what you actually qualified for, you’ll owe some back; if they fell short, you’ll get the rest. Either way, only the net premium you paid counts.

If You’re Not Self-Employed

Without self-employment income, your route to a premium deduction runs through itemized deductions. California follows the federal rule that total medical expenses have to exceed 7.5% of your adjusted gross income before any deduction begins, and only the dollars above that threshold count.⁴ On an $80,000 AGI, that means you need more than $6,000 in qualifying expenses before you see a dime of benefit.

Even clearing the threshold isn’t enough on its own. Your total itemized deductions have to beat California’s standard deduction, which for the 2025 tax year is $5,706 for single filers and $11,412 for married couples filing jointly.⁵ Add up medical costs above the floor plus state property taxes, mortgage interest, and charitable giving; if that total doesn’t exceed the standard deduction, itemizing doesn’t help. Most filers end up taking the standard deduction unless they had a year with major surgery, extensive dental work, or ongoing treatment.

One restriction worth flagging: if your employer pulls your premiums from your paycheck before taxes, you can’t deduct them. That money was never taxed to begin with. Only premiums you pay with after-tax dollars count toward the 7.5% threshold.

Other Medical Expenses That Count

Premiums aren’t the only thing that feeds the threshold. Dental care, including cleanings, fillings, braces, and extractions, qualifies. So do eye exams, prescription glasses, contact lenses and supplies, and laser eye surgery.⁶ Teeth whitening doesn’t. Transportation to medical appointments counts too: bus, taxi, train, or plane fares for trips primarily for medical care, or 20.5 cents per mile plus parking and tolls if you drive, using the 2026 IRS standard medical mileage rate.⁷ Out-of-town treatment can include lodging up to $50 per night per person, though meals don’t qualify.

The California HSA Catch

Here California breaks sharply from federal rules, and the break costs money. Federally, Health Savings Accounts get a triple tax advantage: deductible contributions, tax-free growth, and tax-free withdrawals for medical costs. California recognizes none of it. The state has no provisions comparable to the federal HSA rules, so every federal HSA tax benefit gets reversed on your California return.⁸

Three add-backs show up on your California return:

Your federal HSA contribution deduction goes back on Schedule CA (540), Part I, Section C, Line 13.⁹
Any employer contributions to your HSA are also taxable for California and have to be added to state income.
Interest, dividends, and capital gains earned inside the HSA are reported on Schedule CA (540), Part I, Section A, Line 2.⁹

California and New Jersey are the only two states that tax HSAs this way.⁸ Conformity bills have been introduced more than once but haven’t passed. For 2026, the federal HSA contribution limits are $4,400 for self-only coverage and $8,750 for family coverage.¹⁰ Max those out and you can be adding several thousand dollars back to your California taxable income every year, plus whatever the account earned. The ongoing state tax cost grows along with the balance.

How to Claim It on Your California Return

Schedule CA (540) is the bridge between your federal return and your California return. Every difference between federal and California tax treatment gets handled there, including the HSA add-backs and any adjustments to itemized medical deductions.⁹

California lets you itemize for state purposes even if you took the standard deduction federally, which occasionally pays off because California’s standard deduction is relatively low. If you go that route, you still need to complete a federal Schedule A and attach it to your Form 540.⁹

For the self-employed deduction, the amount flows through your federal Schedule 1 (Form 1040), Line 17, and carries over to your California return without adjustment because the state conforms to the federal rule.¹ The Schedule CA adjustments then feed into Form 540 for your final state calculation.

Hang on to insurance billing statements, payment records, and supporting documentation for at least four years after you file. The Franchise Tax Board generally has four years from the filing date or due date of your return to examine it and issue an assessment, and that window can stretch further if there’s a substantial understatement of income.¹¹ Keeping records an extra year or two is cheap protection.

1
Internal Revenue Service. Instructions for Form 7206
2
Office of the Law Revision Counsel. 26 USC 162 – Trade or Business Expenses
3
Internal Revenue Service. Instructions for Form 8962
4
Franchise Tax Board. Medical Care Expense Deduction California Health Insurance Fairness Act Analysis
5
Franchise Tax Board. Deductions
6
Internal Revenue Service. Publication 502, Medical and Dental Expenses
7
Internal Revenue Service. 2026 Standard Mileage Rates
8
Franchise Tax Board. Bill Analysis AB 781 – Health Savings Account Deduction Conformity
9
Franchise Tax Board. 2025 Instructions for Schedule CA (540)
10
Internal Revenue Service. Expanded Availability of Health Savings Accounts
11
Franchise Tax Board. Keeping Your Tax Records