Extension Payment Estimator
Estimate your tax liability and extension payment for the 2025 tax year.
Important: Extension vs. Payment
An extension gives you more time to file (until October 15, 2026), but does NOT extend the time to pay. Taxes are still due by April 15, 2026. This calculator helps estimate what you should pay to minimize penalties.
Tax Year & Filing Status
Estimated 2025 Income
Enter your best estimates - you can use W-2s, 1099s, and records you have available.
Adjustments & Deductions
Select the adjustments that apply to you, then enter the amounts.
Standard deduction for 2025: $15,000 (single)
Note: SALT deduction cap is $40,000 for 2025 (OBBBA). Phases out for AGI over $500k (MFJ) / $250k (single).
Your Standard Deduction (2025)
Single
$15,000
Payments Already Made
Enter amounts already paid toward your 2025 tax.
Prior Year Information (Optional)
Used to calculate safe harbor and potential penalty avoidance.