Non-Qualified 529 Withdrawal Penalty Calculator
Reviewed by Hamza Gujjar, Algorithm Architect & Software Developer
Last updated: July 27, 2026Why only the earnings portion gets penalized
The 10% federal penalty plus ordinary income tax applies only to the earnings portion of a 529 withdrawal used for non-qualified expenses - the original contributed principal is never taxed or penalized, since it was already after-tax money when contributed.
Worked example
For $5,000 in earnings withdrawn non-qualified, at a 22% marginal tax rate:
Federal Penalty = 5000 x 10% = 500
Income Tax = 5000 x 22% = 1,100
Total Cost = 1,600.0 total cost (500.0 penalty + 1,100.0 tax)
Some states also impose additional penalties or require recapture of previously claimed state tax deductions on non-qualified withdrawals, which this calculation does not include - check your specific state's 529 plan rules before assuming this federal-only figure represents the complete cost.