401(k) Early Withdrawal Calculator

Worked example

Withdrawing $10,000 with 22% federal, 5% state, and the 10% additional tax → about $2,200 + $500 + $1,000 = $3,700 in costs and $6,300 net.

When to use this

• Roughly estimating the cost of an early Traditional 401(k) withdrawal.
• Comparing net proceeds with and without the 10% additional tax.
• Preparing questions before speaking with a tax professional.

Common mistakes

• Assuming Roth withdrawals are taxed the same as Traditional.
• Ignoring that exceptions may waive the additional tax but not ordinary income tax.
• Treating estimated withholding as the final tax bill.

How it works

Estimates taxes and the additional 10% early-distribution tax on a Traditional 401(k) withdrawal. Enter federal and state ordinary-income rates; optionally disable the 10% penalty for age 59½+ or known exceptions. Educational only—exceptions and withholding rules vary.

Limitations

Results are estimates for educational purposes and are not tax advice. Early-distribution exceptions, withholding, and state rules vary—confirm with a tax professional.

Privacy and file handling

Your data stays on your device and is not uploaded.

Accuracy & methodology

This section documents how the calculator works, what it leaves out, and when results were last reviewed. Figures are educational estimates—not professional advice—and are not labeled "current" unless tied to automatically updated reference data.

Formula source or methodology

federalTax + stateTax + optional 10% additional tax; net = withdrawal − totalCost.

Jurisdiction

United States (educational)

Unit system

US dollars and percents

Rounding method

Currency amounts round to two decimal places (half up via Math.round × 100 / 100).

Assumptions

• Flat ordinary-income rates entered by user
• Traditional pre-tax distribution (Roth basis not modeled)

Known omissions

• Not tax, legal, investment, or lending advice. Confirm material decisions with qualified professionals.
• 2026 IRS contribution limits ($24,500 elective deferral; $8,000 catch-up age 50+; $11,250 catch-up age 60–63; $72,000 combined annual additions under §415(c), subject to applicable rules) — confirm plan documents; some tools enforce elective-deferral and §415(c) caps while others are estimate-only
• Employer match annual caps, true-up provisions, and vesting schedules
• Plan administrative fees and fund expense ratios unless a fee field is provided
• Inflation adjustment of future dollars (nominal dollars only unless stated)
• Income tax on withdrawals (pre-tax vs Roth treatment)
• Required minimum distributions (RMDs) and early withdrawal penalties
• IRC §72(t) exceptions and state-specific penalty rules

Test cases (automated)

• $10k with 22% federal, 5% state, 10% penalty → $6,300 net

Version & last verified

Logic version 1.0. Content and formulas last verified 2026-09-12.