Finance Tools
Underpayment Penalty Calculator
Estimate IRS underpayment penalties based on unpaid tax amount, annual penalty rate, and number of days underpaid.
Enter values to estimate underpayment penalty.
Note: This is a simplified daily-interest estimate. Actual IRS penalties may vary by quarter, rate changes, and safe-harbor rules.
How to use this underpayment penalty calculator
- Enter the unpaid tax amount.
- Enter the annual penalty (interest) rate.
- Enter the number of days the tax was unpaid.
- Click Calculate to estimate the penalty.
Example
If $5,000 of tax was underpaid for 120 days at a 7% annual rate:
- Estimated penalty: $115.07
More tools in Finance Tools
- Loan Calculator
Calculate monthly payment, total interest, and total cost for a fixed-rate loan.
- APR Calculator
Estimate the annual percentage rate (APR) for a loan, including upfront fees and closing costs.
- Car Loan Calculator
Estimate your monthly car loan payment based on vehicle price, down payment, interest rate, and loan term.
- Debt-to-Income (DTI) Ratio Calculator
Calculate your DTI ratio to see if you qualify for a mortgage or loan based on your income and monthly debt payments.