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JH Group CPA Tax Extension Calculator

How much should you pay with your 2025 tax extension?

Answer a few simple questions below and we'll calculate your recommended payment. You'll need your 2024 tax return handy — we'll show you exactly where to find each number.

1

Your Filing Information

Let's start with the basics from your 2024 tax return.

Same as what you filed for 2024 (unless it changed)
$
Where to find this: Your 2024 Form 1040, Line 11
$
Where to find this: Your 2024 Form 1040, Line 24 (Total Tax)
2

Your 2025 Estimates

Now, let's estimate what you'll owe for 2025. Don't worry if you're not sure — a rough estimate is fine, or use our Quick Estimator below.

$
Include all income: wages, business, investments, rental, etc.
$
Your best guess is fine. If similar to 2024, use your 2024 amount from above.
3

Taxes You've Already Paid

Enter the total amount of federal tax that was already withheld or paid during 2025. Check your latest pay stub or estimated payment records.

$
From your W-2, 1099, or latest pay stub (year-to-date federal tax withheld)
$
Total of all quarterly payments (Q1–Q4). Enter 0 if you didn't make any.

Federal Results

Estimated Tax Due $0 2025 liability − payments made
Safe Harbor Amount $0 100% of prior year tax
Extension Payment Needed $0 Safe harbor − payments already made

If $0 Paid With Extension

Potential Underpayment $0
Est. IRS Interest (7% APR, ~183 days) $0
Late Payment Penalty (0.5%/mo, up to 5 mo) $0

Payment Summary

Total Recommended Extension Payment $0
Federal $0
Due: April 15, 2026
Pay Online: IRS Direct Pay EFTPS

This calculator provides estimates only. Consult with JH Group CPA for personalized tax advice.

Risk Scenarios

Low Risk

Conservative

Overpay to eliminate penalty risk entirely

$0 110% of prior year tax
Medium Risk

Standard

Pay the recommended safe harbor minimum

$0 Recommended safe harbor
Higher Risk

Aggressive

Minimum based on current year estimate

$0 90% of estimated current year