CalSavers contributions are post-tax by default. The program enrolls you in a Roth IRA, so the money moving from your paycheck into the account has already had federal income tax, California state income tax, Social Security, and Medicare withheld. You can switch to a Traditional IRA through the program if you’d rather claim a deduction at tax time, but the default answer to whether CalSavers is pre or post tax is post-tax.
Why the Default Is Post-Tax
When your employer adds you to CalSavers, the account that gets opened in your name is a Roth IRA.1CalSavers. Program Details Under federal tax law, Roth contributions are made with after-tax dollars.2Office of the Law Revision Counsel. 26 USC 408A – Roth IRAs You get no deduction and no reduction in your taxable income for the year you contribute.
The payoff comes later. Because you paid tax upfront, qualified withdrawals in retirement come out completely tax-free, including every dollar of investment growth the account has accumulated. For workers who expect to be in the same or a higher tax bracket when they retire, locking in today’s rate is often the better deal, and that’s why the state picked Roth as the default: most CalSavers participants are lower- and moderate-income earners.
What Post-Tax Looks Like on Your Paycheck
Because the contribution is post-tax, it doesn’t shrink the income taxes your employer withholds. Payroll runs on your full gross wages, and the CalSavers deduction comes out of what’s left.
Say you earn $1,000 gross in a pay period and contribute the default 5%. Your employer calculates federal and state income tax, Social Security, and Medicare on the full $1,000, not on $950. The $50 CalSavers deduction then comes out of your net pay. Compare that to a traditional 401(k), where the $50 would come off the top and you’d only owe income tax on $950. With CalSavers, your take-home pay drops by the full $50 and your tax bill for the year stays the same.
The deduction shows up as a separate line on your pay stub. At tax time, your Roth contributions don’t lower what you owe or boost your refund.
One more thing worth knowing about that 5%: it isn’t fixed. Every January 1 after your enrollment, the default rate climbs by 1% automatically, up to a cap of 8%.3Legal Information Institute. Cal. Code Regs. Tit. 10, 10005 – Default Program Options and Alternative Elections You can set any rate you want, pause contributions, or opt out at any time, but if you leave the default alone, the post-tax bite grows each year.
Switching to a Traditional IRA
CalSavers isn’t locked to Roth. You can recharacterize your account to a Traditional IRA through the program at any time.1CalSavers. Program Details Traditional IRA contributions may be tax-deductible, which lowers your taxable income for the year you make them.
Here’s the catch most people miss. Even after you switch, your employer still withholds taxes on your full gross pay every pay period. CalSavers runs through standard payroll deduction, not a pre-tax payroll arrangement like a 401(k). You capture the Traditional IRA tax benefit later, when you file your return and claim the deduction, which either shrinks what you owe or grows your refund. The benefit is real, but your paycheck never reflects it the way an employer-sponsored plan would.
So in strict payroll terms, CalSavers is post-tax either way. The Traditional option just hands you back the tax at filing instead of letting you skip it at the source.
When Post-Tax Pays Off
Two things make the Roth default worth it despite the lack of an upfront deduction.
First, your original contributions can come out at any time, for any reason, with no tax and no penalty. You already paid tax on those dollars, so the IRS doesn’t touch them again. Contribute $5,000 over several years and you can pull up to $5,000 back out without reporting a cent as income. This only covers contributions, not investment earnings; the CalSavers administrator tracks the two separately, and Roth ordering rules pull contributions out first.
Second, the earnings themselves become tax-free once your withdrawal qualifies as a “qualified distribution.” Two conditions have to be met together: you must have held a Roth IRA for at least five tax years, counted from January 1 of the year of your first Roth contribution, and you must be at least 59½, permanently disabled, or taking the money as a beneficiary after the account holder’s death.2Office of the Law Revision Counsel. 26 USC 408A – Roth IRAs Meet both and every dollar leaves the account tax-free, including decades of compounded growth.
Pull earnings out early and the picture flips. The earnings get added to your taxable income for the year, the IRS adds a 10% penalty, California income tax applies, and the Franchise Tax Board adds its own 2.5% penalty on top.4Office of the Law Revision Counsel. 26 USC 72 – Annuities; Certain Proceeds of Endowment and Life Insurance Contracts5Franchise Tax Board. Early Distributions A first-time home purchase up to $10,000 and permanent disability are among the situations that waive the 10% federal penalty. None of these penalties apply to withdrawals of your original contributions; only earnings carry the risk.
The One Immediate Tax Break: The Saver’s Credit
There is one way post-tax CalSavers contributions can cut your tax bill in the year you make them. The federal Retirement Savings Contributions Credit, usually called the Saver’s Credit, applies regardless of whether your IRA is Roth or Traditional. It’s a direct credit worth 10% to 50% of your contribution, depending on income and filing status, capped at $1,000 for single filers and $2,000 for married couples filing jointly.6Internal Revenue Service. Retirement Savings Contributions Credit (Saver’s Credit)
For 2026, the credit phases out above $40,250 of adjusted gross income for single filers, $60,375 for heads of household, and $80,500 for married couples filing jointly.7Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 Lower income inside the range earns a higher credit rate. You claim it on IRS Form 8880 when you file.
Income Limits That May Force the Choice
Roth IRAs come with income caps, and if yours is high enough, the post-tax default can create a problem. For 2026, Roth eligibility phases out between $153,000 and $168,000 of modified adjusted gross income for single and head-of-household filers, and between $242,000 and $252,000 for married couples filing jointly. For married filing separately, the phase-out range is $0 to $10,000.7Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
Above those ceilings, you can’t make Roth contributions at all. Leaving excess money in a Roth triggers a 6% excise tax every year on the excess until you remove it.8Internal Revenue Service. IRA Year-End Reminders A CalSavers participant who crosses the limit has two clean options: recharacterize the account to a Traditional IRA, or opt out of CalSavers entirely.1CalSavers. Program Details
The overall IRA contribution limit for 2026 is $7,500, with an additional $1,100 catch-up contribution allowed if you’re 50 or older, for a total of $8,600.7Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 That limit applies across all your IRAs combined, so if you contribute to another IRA outside CalSavers, you’ll need to track the total yourself to stay under the cap.