How California Taxes Social Security in Retirement

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Last updated: August 15, 2026 · By Gold California Editorial

This page explains how California treats Social Security benefits on a resident's state income tax return. It also covers the federal inclusion rule and the Schedule CA (540) subtraction that removes the federal amount from California income. Every figure traces to a primary source at the Franchise Tax Board, the IRS, or the California Revenue and Taxation Code. Rules move quickly; verify your specific numbers with a licensed CPA before you file.

Does California tax Social Security?

No. California does not tax Social Security benefits. Revenue and Taxation Code section 17087(a) states that Internal Revenue Code section 86, the federal rule that pulls a portion of Social Security into taxable income, shall not apply for California purposes (source: R&TC section 17087). The exemption applies to every California resident, at every income level.

The exemption covers retirement, survivors, and disability benefits paid under Title II of the Social Security Act. FTB Publication 1005 confirms the mechanics on page 5 of the 2024 edition. Any federally taxable portion of Social Security is removed on Schedule CA (540) and does not enter California taxable income (source: FTB Publication 1005, Pension and Annuity Guidelines, 2024).

The California rule has been settled for years. Section 17087 was last amended by Statutes of 1999, Chapter 987, effective October 10, 1999, and it has not been reopened since. There is no income cap, no phase-out, and no filing-status exception. Every dollar of Social Security is out of California taxable income.

Which Social Security payments the state exempts

The Social Security exemption in California covers the benefits paid under Title II of the Social Security Act: retirement, survivors, and Social Security Disability Insurance (SSDI). All three enter the federal calculation under IRC section 86, and all three are removed from California taxable income by R&TC 17087(a) (source: R&TC section 17087; FTB Publication 1005).

Supplemental Security Income (SSI) is a separate program administered by the Social Security Administration but funded from general federal revenue, not Social Security payroll tax. IRS Publication 915 states that SSI payments are not taxable and are not included in gross income at the federal level (source: IRS Publication 915, Social Security and Equivalent Railroad Retirement Benefits). California follows the federal rule, so SSI also stays out of the state return.

Tier 1 U.S. Railroad Retirement benefits, called Social Security equivalent benefits in IRS Publication 915, are treated the same as Social Security in California. Tier 2 railroad benefits are handled separately by R&TC 17087(b). Both are covered later on this page in the railroad retirement section.

What the federal side still does to Social Security

The state exemption does not touch your federal return. Internal Revenue Code section 86 can pull up to 85 percent of your Social Security benefits into federal taxable income, depending on a figure called combined income (source: 26 U.S.C. section 86). Many California retirees are surprised when the federal 1040 taxes a large slice of the same benefit the state excludes.

Combined income equals your adjusted gross income (before the Social Security addition), plus tax-exempt interest, plus one-half of your Social Security benefits (source: IRS Publication 915, worksheet A). The higher this combined figure, the larger the federally taxable slice.

Two thresholds matter. If combined income exceeds the base amount, up to 50 percent of benefits can be taxable federally. If it also exceeds the adjusted base amount, up to 85 percent can be taxable. Both amounts vary by filing status.

The base amount is $25,000 for a single filer and $32,000 for a joint return. The adjusted base amount is $34,000 for a single filer and $44,000 for a joint return (source: 26 U.S.C. section 86(c)). These figures have been fixed by statute since Congress amended section 86 in 1993 and are not indexed for inflation.

Federal thresholds and California treatment at a glance

Sources: California Revenue and Taxation Code section 17087; 26 U.S.C. section 86; FTB Publication 1005 (2024); IRS Publication 915 (2025). Checked August 2026. Combined income equals adjusted gross income (before the Social Security addition), plus tax-exempt interest, plus one-half of Social Security benefits, per IRS Publication 915. This is a general reference; consult your CPA for your situation.

How the Schedule CA (540) subtraction works

The mechanics on your California return follow a two-step path. Your federal Form 1040 may include a portion of your Social Security benefits in adjusted gross income under IRC section 86. On the California return, that same amount is removed on Schedule CA (540) so it does not enter California taxable income (source: FTB Schedule CA (540) instructions, 2024).

Specifically, Schedule CA (540), Part I, Section B, line 6b is where the federally taxable Social Security amount is subtracted in Column B. The gross benefits on line 6a stay for federal-reference purposes, and only the federally taxable slice flows down and is removed. FTB Publication 1005 walks through the same subtraction on page 5.

The subtraction is automatic in the sense that it is required by statute for every California resident who reports Social Security benefits on the federal return. There is no election to make and no eligibility test to meet. A California resident who is required to include, say, 85 percent of a $30,000 annual benefit federally will subtract that same $25,500 on Schedule CA (540).

The result is a mismatch that is a feature, not a bug. Your federal adjusted gross income can include a substantial Social Security amount, while your California adjusted gross income excludes it. This is the reason many California retirees see a lower state tax than a rough estimate suggests.

How to report Social Security on your California return

The steps below outline how a California resident carries Social Security benefits from the federal return through to the California return. They describe the mechanics; they are not tax advice, and your CPA handles the specifics.

1. Collect your SSA-1099 form. The Social Security Administration issues Form SSA-1099 each January showing total benefits paid during the prior year. Railroad workers receive Form RRB-1099 for Tier 1 amounts.
2. Compute the federally taxable portion. Use the worksheet in IRS Publication 915 or the Social Security Benefits Worksheet in the Form 1040 instructions to find the taxable amount under IRC section 86.
3. Enter the totals on Form 1040. Report gross benefits on line 6a and the federally taxable amount on line 6b of Form 1040, which flows into federal adjusted gross income.
4. Carry the amounts to Schedule CA (540). On Schedule CA (540), Part I, Section B, line 6, the federal amounts appear in Column A, matching Form 1040.
5. Subtract the taxable portion in Column B. The federally taxable amount on line 6b is entered as a subtraction in Column B on the same line, so it is removed from California taxable income.
6. Verify Schedule CA (540) totals down to Form 540. The subtracted amount reduces California adjusted gross income, then California taxable income, before the Form 540 tax table or rate schedule applies.
7. Keep the SSA-1099 with your tax file. The Franchise Tax Board can request source documents for up to four years, so keep the SSA-1099 alongside your Form 1040 and Schedule CA (540).

If you are unsure which line applies or how a special situation (a lump-sum election, a repayment, a foreign pension) affects your specific numbers, a licensed CPA is the right call. Consult your tax advisor for your specific situation.

SSDI and SSI at the California level

Social Security Disability Insurance (SSDI) is paid under Title II of the Social Security Act, the same title that funds retirement and survivors benefits. The federal inclusion rule in IRC section 86 applies to SSDI, so it can be partly taxable on the federal return under the same combined-income thresholds (source: IRS Publication 915). At the California level, R&TC 17087(a) blocks IRC section 86, and SSDI stays out of California taxable income.

Supplemental Security Income (SSI) is a needs-based program administered by the Social Security Administration but funded from general federal revenue. IRS Publication 915 states that SSI payments are not taxable and are not reported as income on Form 1040. Because the amount never enters federal taxable income in the first place, there is nothing to subtract on Schedule CA (540). SSI is out at both the federal and California levels.

Two practical notes matter for California SSDI recipients. First, a lump-sum SSDI payment for a prior year uses the same lump-sum election rules under IRC section 86(e) on the federal return; the elected federally taxable amount is still subtracted on Schedule CA (540). Second, an SSDI recipient who also receives California State Disability Insurance (SDI) payments must handle SDI separately, since SDI is not a Social Security program.

Railroad retirement benefits in California

U.S. Railroad Retirement benefits paid by the Railroad Retirement Board split into two tiers. Tier 1 approximates the Social Security benefit a covered railroad worker would have earned; IRS Publication 915 calls it Social Security equivalent benefits and applies IRC section 86 to it. Tier 2 is an additional contributory annuity, treated federally under the rules of IRC section 72(r).

At the California level, both tiers are excluded from state income tax. R&TC 17087(a) blocks IRC section 86 for the Tier 1 amount, and R&TC 17087(b) blocks IRC section 72(r) for the Tier 2 amount (source: R&TC section 17087). The result is that a California-resident railroad retiree who receives both Tier 1 and Tier 2 amounts on Form RRB-1099 and Form RRB-1099-R can subtract each federally taxable slice on Schedule CA (540).

One narrow point matters for former railroad workers. FTB Publication 1005 notes that benefits paid by an individual railroad, rather than by the Railroad Retirement Board, are taxable by California as an ordinary pension (page 5). If your Form 1099-R shows a private railroad plan as the payer, the amount enters California taxable income at Form 540 rates. Your CPA can confirm which payer issued each form.

Common points of confusion between federal and state

Several patterns show up on California retirees' returns and reflect the mismatch between the federal inclusion rule and the state exemption. Naming them up front prevents a costly filing error.

• The federal 1040 shows a taxable Social Security amount, so it must be taxable in California too. No. The federal amount is required on Form 1040 line 6b and enters federal adjusted gross income, but Schedule CA (540) subtracts it in Column B and it never enters California taxable income.
• SSI and SSDI are the same thing. No. SSDI is a Title II insurance benefit funded by payroll tax, subject to the IRC 86 inclusion rule federally. SSI is a needs-based program funded by general revenue, not taxable at either level.
• Because California exempts Social Security, other retirement income is exempt too. No. California taxes pensions, IRA distributions, 401(k) withdrawals, and annuities as ordinary income at Form 540 rates. Only Social Security and Railroad Retirement carry the R&TC 17087 exemption.
• A high-income California retiree loses the Social Security exemption. No. The exemption applies at every income level, including a filer above the $1,000,000 threshold for the 1 percent Mental Health Services Tax under R&TC 17043.
• A federally taxable Social Security amount increases California adjusted gross income. No. Because the subtraction happens on Schedule CA (540) before the total flows to Form 540, California adjusted gross income already excludes the Social Security slice.
• Foreign social security payments get the same California exemption. Not automatically. Payments from a foreign social security system are not U.S. Social Security under Title II, and their California treatment depends on the applicable treaty and Publication 1005 guidance. Ask your CPA.

Nonresidents, part-year residents, and Social Security

A California nonresident does not owe California income tax on Social Security benefits, because the state does not tax Social Security for anyone. A part-year resident applies the same rule. Any Social Security benefits received during the California-resident portion of the year are still exempt under R&TC 17087(a). Any received during the nonresident portion were not California-source income in the first place.

Public Law 104-95, codified at 4 U.S.C. section 114, adds another layer of protection for former California residents. Once you become a bona fide resident of another state, the federal source-tax law bars California from taxing your retirement income going forward, including pensions, 401(k) withdrawals, and IRA distributions (source: Public Law 104-95, 109 Stat. 979). Social Security itself does not need this protection in California, because R&TC 17087(a) already excludes it.

Residency is examined by facts and circumstances. California looks at where you actually live, work, vote, register vehicles, hold a driver's license, and keep your family and property ties. A move on paper while your real life stays in California will not shift the state's claim on other income. Consult your tax advisor before relying on a move.

California Social Security tax questions, answered

Does California tax Social Security retirement benefits?

No. California does not tax Social Security retirement benefits at any income level. Revenue and Taxation Code section 17087(a) blocks Internal Revenue Code section 86 for California purposes, and FTB Publication 1005 confirms that any federally taxable portion is subtracted on Schedule CA (540). The exemption applies to every California resident.

Does California tax Social Security disability (SSDI)?

No. SSDI is paid under Title II of the Social Security Act, the same title as retirement benefits, and is covered by the R&TC 17087(a) exemption. Any federally taxable portion under IRC section 86 is removed on Schedule CA (540). Supplemental Security Income (SSI) is not taxable at either the federal or California level, per IRS Publication 915.

How much of my Social Security is federally taxable?

Under IRC section 86, up to 50 percent is taxable if combined income exceeds the base amount ($25,000 single, $32,000 joint). Up to 85 percent is taxable if it also exceeds the adjusted base amount ($34,000 single, $44,000 joint). The exact figure comes from the worksheet in IRS Publication 915. California removes the federally taxable amount on Schedule CA (540).

Is U.S. Railroad Retirement taxed in California?

No. Tier 1 U.S. Railroad Retirement benefits, called Social Security equivalent benefits in IRS Publication 915, are treated the same as Social Security in California and covered by R&TC 17087(a). Tier 2 contributory benefits are excluded from California income by R&TC 17087(b), which blocks IRC section 72(r). Both tiers stay out of California taxable income.

What about Social Security received while I lived outside California?

California does not tax Social Security regardless of where you live. Federal law adds a layer for other retirement income: Public Law 104-95, at 4 U.S.C. section 114, bars any state from taxing the retirement income of an individual who is not a resident or domiciliary of that state. For Social Security specifically, California's R&TC 17087(a) exemption already applies.

Do I have to file a California return if my only income is Social Security?

Filing thresholds are set on the Form 540 booklet each year based on gross income, adjusted gross income, filing status, and age. Because Social Security is subtracted from California adjusted gross income, a filer whose only income is Social Security often falls below the California filing threshold. Confirm the current-year threshold on the Form 540 booklet or with your CPA.

Where does the Schedule CA (540) subtraction actually go?

Schedule CA (540), Part I, Section B, line 6b. Column A reports the federally taxable amount from Form 1040 line 6b, and Column B enters the same amount as a subtraction, removing it from California taxable income. FTB Publication 1005, page 5, walks through the same steps in prose form.

Does the 1 percent Mental Health Services Tax apply to Social Security?

No. The 1 percent Mental Health Services Tax under R&TC 17043(a) applies to the portion of California taxable income above $1,000,000. Because Social Security is subtracted before California taxable income is computed, it never enters that base. Only the other portions of a very-high-income filer's income can push past the threshold.