401k Early Withdrawal Penalty in California: 10% + 2.5% and Exceptions

The early withdrawal penalty on a 401(k) in California is 12.5%: the federal 10% additional tax plus California’s 2.5% state penalty under Revenue and Taxation Code section 17085.¹ Both penalties sit on top of ordinary federal and California income tax on the distribution, so the total bite on money pulled from a pre-tax 401(k) before age 59½ commonly runs 40% or more of the amount withdrawn.

What an Early 401(k) Withdrawal Actually Costs

The 12.5% is only the penalty piece. The taxable portion of the distribution also counts as ordinary income on both your federal and California returns, taxed at your marginal rate at each level.

Take a $50,000 early distribution of pre-tax 401(k) money for someone in the 22% federal bracket and California’s 9.3% bracket:

Federal income tax: $11,000
California income tax: $4,650
Federal 10% penalty: $5,000
California 2.5% penalty: $1,250
Total: $21,900, or 43.8% of the withdrawal

At higher incomes it gets worse. California’s top marginal rate reaches 12.3%, and a 1% Mental Health Services Tax applies to taxable income above $1 million.² A Californian in the 32% or 37% federal bracket can lose more than half of an early 401(k) distribution to combined taxes and penalties.

How the Two Penalties Are Calculated

The IRS treats any distribution from a 401(k) taken before age 59½ as a premature distribution and imposes a 10% additional tax on the taxable portion.³ California uses the same federal rules to decide whether a distribution is premature, then applies its own 2.5% rate.¹ The two penalties are computed separately but stack: a $50,000 early withdrawal produces $5,000 federal and $1,250 California, for $6,250 before income tax even enters the picture.

One boundary worth noting: for SIMPLE IRA plans (not a typical workplace 401(k)), California’s penalty rate rises to 6% if the distribution occurs within the first two years of participation.⁴

Exceptions That Waive the Penalty on a 401(k)

The IRS recognizes a list of situations that eliminate the 10% penalty. Before working through them, one warning: several widely publicized exceptions are IRA-only. Withdrawals for qualified higher education expenses, up to $10,000 in first-time homebuyer costs, and health insurance premiums during unemployment do not shield a 401(k) distribution from the federal penalty.³ If you read that you can pull retirement money penalty-free for college or a down payment, that was IRA advice.

The exceptions that do apply to 401(k) distributions:

Death of the account holder, with the distribution going to a beneficiary or the estate.
Total and permanent disability of the participant.
Separation from service in or after the calendar year you turn 55. Public safety employees and firefighters qualify at age 50 or after 25 years of service, whichever comes first. The distributions must come from that employer’s plan.
Substantially equal periodic payments (SEPP), a series of roughly equal annual withdrawals calculated under an IRS-approved method. The payments must continue for the longer of five years or until you reach 59½; breaking the schedule triggers the 10% penalty retroactively, with interest.⁵
Unreimbursed medical expenses above 7.5% of adjusted gross income.
Distributions to a former spouse or alternate payee under a qualified domestic relations order (QDRO).
Reservists called to active duty for at least 180 days.
Distributions made to satisfy an IRS levy against the plan.
Up to $5,000 withdrawn within one year of a qualified birth or adoption.³

Newer SECURE 2.0 Exceptions

The SECURE 2.0 Act added several 401(k) penalty exceptions that phased in starting in 2024. Most are optional for plan sponsors, so whether you can use them depends on your employer’s plan.

A physician-certified terminal illness eliminates the 10% penalty on distributions, though the funds remain taxable as ordinary income.³ Victims of domestic abuse by a spouse or domestic partner can withdraw the lesser of $10,000 (indexed for inflation) or 50% of their vested balance without penalty, provided the distribution is taken within a year of the abuse; the funds can be repaid within three years for a refund of taxes paid. Plans may allow one penalty-free emergency personal expense withdrawal of up to $1,000 per year, with restrictions on repeat withdrawals until the earlier amount is repaid or three years have passed. Distributions tied to federally declared disasters can also qualify for relief, with dollar limits and rules that vary by declaration.

Where California Diverges From Federal Exceptions

California generally follows the federal list. The state’s Internal Revenue Code conformity date is currently January 1, 2025, and California law broadly incorporates the SECURE 2.0 changes.⁴ A distribution that qualifies for a federal waiver will almost always qualify for a waiver of the 2.5% state penalty as well.

The Franchise Tax Board flags a few areas of non-conformity. California does not follow every federal disaster distribution provision, so a federal disaster-based waiver does not automatically clear the state penalty. California does not recognize Health Savings Accounts, so any HSA-linked distribution rules do not translate. And California treats federally permitted 529-to-Roth IRA rollovers as taxable and subject to the 2.5% additional tax.⁴

The medical expense exception has a California-specific wrinkle. The 7.5%-of-AGI threshold is measured against California adjusted gross income for state purposes, and California AGI can differ from federal AGI. If your California AGI is higher, fewer medical costs will clear the threshold, and a withdrawal that avoids the federal penalty on medical grounds could still trigger the state’s 2.5%.

The IRA-only federal exceptions for higher education and first-time home purchases are also rejected by California, so an IRA withdrawal for tuition or a home purchase that escapes the federal 10% still faces the state 2.5%.

Common Traps

Hardship Withdrawals Do Not Skip the Penalty

Qualifying for a hardship distribution lets you access 401(k) money despite plan restrictions, but the IRS still imposes the 10% penalty unless you independently meet one of the exceptions above.⁶ California’s 2.5% applies the same way. If your hardship happens to fit a recognized exception, say medical costs above 7.5% of AGI, the penalty is waived on that basis, not because the plan classified the withdrawal as a hardship.

Withholding Will Not Cover the Bill

Federal law requires the plan administrator to withhold 20% of an eligible rollover distribution for federal income tax.⁷ That 20% is a prepayment, not a settlement. If your marginal rate plus the 10% penalty exceeds 20%, you owe the difference at filing. California withholding is separate and often falls short of the combined state income tax and 2.5% penalty, so you may need to make an estimated payment to the FTB to avoid an underpayment charge. This is the step people most often skip.

Roth 401(k) Money Is Only Partly Protected

If your 401(k) includes a designated Roth account, your contributions were already taxed and are not subject to income tax or the early withdrawal penalty when distributed. Earnings are different. If the distribution is not qualified, meaning you have not held the Roth account at least five years and reached 59½, the earnings portion is subject to ordinary income tax and to both early withdrawal penalties. Plan administrators generally distribute Roth 401(k) funds pro rata between contributions and earnings, so you cannot pull only contributions the way you can with a Roth IRA.

How to Report the Distribution and Claim an Exception

Your plan administrator will send a Form 1099-R showing the gross distribution, the taxable amount, and federal tax withheld.⁸ Box 7 carries a distribution code: Code 1 means an early distribution with no known exception, Code 2 means the administrator already recognizes an exception, and Code 3 indicates disability.⁹

A Code 1 on your 1099-R does not settle the question. The administrator often has no way to know why you took the money. You claim the exception yourself on IRS Form 5329, which is where the 10% penalty is actually calculated. File Form 5329 with your federal return whenever you claim an exception, even if no penalty is ultimately owed.³

For California, report the distribution on Form 540 and compute the 2.5% penalty on FTB Form 3805P. The state form mirrors the federal process for claiming exceptions.⁴ Skipping Form 5329 or Form 3805P when a penalty is owed will eventually generate assessments from both agencies, with interest running from the original due date.

1
California Legislative Information. California Revenue and Taxation Code 17085
2
State of California Franchise Tax Board. 2025 California Tax Rate Schedules
3
Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions
4
State of California Franchise Tax Board. 2025 Instructions for Form FTB 3805P – Additional Taxes on Qualified Plans
5
Internal Revenue Service. Substantially Equal Periodic Payments
6
Internal Revenue Service. 401(k) Plan Hardship Distributions – Consider the Consequences
7
Office of the Law Revision Counsel. 26 USC 3405 – Special Rules for Pensions, Annuities, and Certain Other Deferred Income
8
Internal Revenue Service. About Form 1099-R
9
Internal Revenue Service. 2025 Instructions for Forms 1099-R and 5498