If you cash out your 403(b), the taxable portion is added to your ordinary income for the year, and if you’re younger than 59½ the IRS adds a flat 10% early withdrawal penalty on top. For someone in the 24% federal bracket in a state with a 5% income tax, roughly 39% of the distribution is gone before the money reaches your account. Once you factor in bracket creep from a large lump sum and possible Medicare and Social Security effects, the real cost on a big cashout often lands between 30% and 45%.
What Part of the Withdrawal Is Actually Taxable
Not every dollar coming out of a 403(b) is taxed the same way. The starting point is figuring out what type of money went in.
Most participants contribute on a pre-tax basis. That money was never taxed on the way in, so when you withdraw it, both the contributions and their investment earnings are taxable as ordinary income. No capital gains rate, no partial exclusion.1Internal Revenue Service. Retirement Plans FAQs Regarding 403(b) Tax-Sheltered Annuity Plans
If your plan allowed voluntary after-tax (non-Roth) contributions, you already paid tax on that money the year you contributed it. Only the earnings on those after-tax contributions are taxable when you take them out. Your plan administrator tracks the split on Form 1099-R.1Internal Revenue Service. Retirement Plans FAQs Regarding 403(b) Tax-Sheltered Annuity Plans
Designated Roth 403(b) money is different again. Qualified distributions come out entirely tax-free, including the earnings, if you’ve held the Roth account for at least five tax years and are at least 59½, disabled, or deceased.2Internal Revenue Service. Retirement Plans FAQs on Designated Roth Accounts Cash out a Roth 403(b) before meeting both conditions and your original contributions still come out tax-free, but the earnings are taxable and can be hit with the 10% penalty.3Internal Revenue Service. Retirement Topics – Designated Roth Account
Federal Income Tax and Bracket Creep
The taxable portion stacks on top of everything else you earned that year: wages, interest, rental income, all of it. Because the federal system is progressive, a large distribution can push part of your income into a higher bracket.
For 2026, the federal brackets for a single filer are:
- 10% up to $12,400
- 12% from $12,401 to $50,400
- 22% from $50,401 to $105,700
- 24% from $105,701 to $201,775
- 32% from $201,776 to $256,225
- 35% from $256,226 to $640,600
- 37% over $640,600
For married couples filing jointly, the thresholds are roughly double: the 22% bracket runs from $100,801 to $211,400, and the 24% bracket from $211,401 to $403,550.4Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
Consider a single filer with $80,000 in taxable income sitting in the 22% bracket. Cash out a $100,000 403(b) and taxable income jumps to $180,000. The first $25,700 of the distribution fills out the 22% bracket, and the remaining $74,300 is taxed at 24%. The whole distribution isn’t taxed at the top rate, but the effective rate on the withdrawal itself climbs sharply.
One thing in your favor: 403(b) distributions are exempt from the 3.8% net investment income tax that applies to other kinds of investment earnings.5Internal Revenue Service. Questions and Answers on the Net Investment Income Tax
State Income Tax
Most states treat taxable 403(b) distributions as ordinary income. Rates run from zero in states with no income tax to more than 13% at the top. Some states offer retirement income exclusions, but those breaks usually kick in only after you reach a specified age (often 59½ or 65) and typically cap the excluded amount. Cashing out a whole account in one year, especially before retirement age, generally means paying the full state rate with no exclusion.
Combined with federal tax, the total income tax on a large distribution often lands between 30% and 45% depending on your bracket and where you live, before the early withdrawal penalty is added.
The 10% Early Withdrawal Penalty
If you’re younger than 59½ when you take the distribution, the IRS adds a 10% additional tax on the taxable portion. This is a flat penalty, not a withholding that gets reconciled later.6Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions
On a $50,000 taxable distribution taken at age 45, that’s $5,000 in penalty on top of your income tax. For someone in the 24% federal bracket with a 5% state rate, the combined tax and penalty comes to roughly $19,500, leaving about $30,500. You report the penalty on Form 5329, filed with your regular return.7Internal Revenue Service. About Form 5329, Additional Taxes on Qualified Plans (Including IRAs) and Other Tax-Favored Accounts
Exceptions That Wipe Out the Penalty
Several situations remove the 10% penalty. Every one of them still leaves you owing full federal and state income tax on the taxable amount; only the extra 10% goes away.6Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions
If you leave your employer during or after the calendar year you turn 55, distributions from that employer’s 403(b) are penalty-free. The threshold drops to 50 for qualified public safety employees in governmental plans. This applies only to the plan at the employer you left, not to old 403(b)s from other jobs or to IRAs holding rolled-over balances.6Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions
You can also avoid the penalty by taking a series of substantially equal periodic payments based on your life expectancy under Section 72(t). Once you start, you must continue for at least five years or until you reach 59½, whichever is later. Break the schedule and the IRS retroactively applies the 10% penalty to every payment you’ve taken, with interest.8Internal Revenue Service. Substantially Equal Periodic Payments
Other long-standing exceptions cover death, total and permanent disability, unreimbursed medical expenses above 7.5% of adjusted gross income, IRS levies, distributions to a former spouse under a qualified domestic relations order, and certain distributions to military reservists called to active duty for at least 180 days.6Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions More recent additions under SECURE 2.0 include terminal illness, up to $5,000 per child within a year of birth or adoption, a $1,000 annual emergency personal expense withdrawal if the plan offers it, up to the lesser of $10,000 (indexed) or 50% of vested balance for a self-certifying domestic abuse victim, and distributions in federally declared disaster areas.
One misconception worth clearing up: the first-time homebuyer exception and the higher education expense exception apply only to IRAs. They don’t help you with a 403(b) cashout.6Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions
Hidden Costs: Medicare Premiums and Social Security
A big distribution can raise costs that don’t show up on your tax return that year. Medicare Part B premiums are income-adjusted, and if your modified adjusted gross income exceeds certain thresholds you pay a monthly surcharge called IRMAA. For 2026, the surcharges begin above $109,000 for individual filers or $218,000 for joint filers.9Centers for Medicare & Medicaid Services (CMS). 2026 Medicare Parts A and B Premiums and Deductibles
Medicare uses your tax return from two years earlier to set your premiums. Cash out $200,000 in 2026, and your 2028 Medicare premiums could rise by $81 to $487 per month per person depending on where your total income lands. For a married couple both on Medicare, the surcharge applies to each spouse separately.9Centers for Medicare & Medicaid Services (CMS). 2026 Medicare Parts A and B Premiums and Deductibles
The same income spike can pull more of your Social Security benefits into taxable territory. If your combined income (adjusted gross income plus nontaxable interest plus half your Social Security) exceeds $25,000 single or $32,000 joint, up to 50% of your benefits become taxable. Above $34,000 single or $44,000 joint, up to 85% is taxable. A cashout can push you across those lines for the year.
Mandatory 20% Withholding Is Not Your Final Bill
When a 403(b) plan pays a cashout directly to you, the administrator must withhold 20% of the taxable amount for federal income tax. You can’t opt out on an eligible rollover distribution paid to you.10Internal Revenue Service. Pensions and Annuity Withholding
That 20% is a prepayment. If your combined federal bracket, penalty, and state tax exceed 20%, the rest is due at filing time. People often spend the full amount they received and then face a large bill in April. If you know you’ll owe more than what was withheld, an estimated tax payment in the quarter you take the distribution avoids an underpayment penalty. The plan reports the distribution to you and the IRS on Form 1099-R; you calculate the early withdrawal penalty separately on Form 5329.11Internal Revenue Service. Form 1099-R – Distributions From Pensions, Annuities, Retirement or Profit-Sharing Plans, IRAs, Insurance Contracts, etc.
Rolling Over Instead of Cashing Out
Rolling the money into another retirement account avoids all of these costs. A direct rollover, where the plan sends the funds straight to an IRA or another employer plan, triggers no withholding, no income tax, and no penalty.12Internal Revenue Service. Rollovers of Retirement Plan and IRA Distributions
If the distribution is paid to you first, you have 60 days to deposit it into an IRA or qualified plan to avoid taxation. Because the plan already withheld 20%, you’d need to make up that 20% from other funds to roll over the full pre-withholding amount. Anything not rolled over within 60 days becomes a taxable distribution and can face the early withdrawal penalty.12Internal Revenue Service. Rollovers of Retirement Plan and IRA Distributions
If you only need part of the balance, many plans allow partial distributions. Taking just what you need as a taxable withdrawal and rolling the rest directly into an IRA limits the tax damage to the portion you actually spend.