A Roth conversion window occurs when your income temporarily dips below your usual bracket — career transition, sabbatical, part-time year, early retirement — allowing you to convert pre-tax IRA/401(k) funds to Roth at a lower rate, then enjoy tax-free growth forever.
Enter a balance and conversion amount to model your window.
⚠️ Consult a tax advisor before converting. State taxes, ACA subsidies, IRMAA brackets, and AMT can affect the math significantly.