What is a Safe harbor for estimated taxes?
A safe harbor for estimated taxes is an IRS rule that shields taxpayers from underpayment penalties if their total withholding and estimated payments meet specific thresholds. The standard safe harbor requires payment of at least 90% of the current-year tax liability or 100% of the prior-year liability, whichever is smaller. For taxpayers with adjusted gross income above $150,000, the threshold rises to 110% of the prior year's tax. Meeting the safe harbor means no penalty even if you owe a balance at filing. Contributing to a Traditional 401k reduces taxable income and can lower the estimated payment needed to satisfy safe harbor requirements.
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