Free Tax Tool
Estimated Tax Calculator
Estimate your 2025 federal income tax and NJ Gross Income Tax liability — and calculate how much to pay each quarter to avoid underpayment penalties.
Enter Your Information
Total Box 1 wages from all W-2s
Schedule C profit, K-1 ordinary income
Net short-term and long-term gains
Rental income, interest, dividends, etc.
W-2 Box 2 + other federal tax withheld
How Quarterly Estimated Taxes Work
If you earn income that is not subject to withholding — self-employment income, rental income, capital gains, or large interest and dividend income — you are generally required to pay federal and NJ estimated taxes quarterly.
When Estimated Taxes Are Due
Federal estimated tax payments (Form 1040-ES) and NJ estimated payments (NJ-1040-ES) are due four times per year:
- • Q1: April 15
- • Q2: June 15
- • Q3: September 15
- • Q4: January 15 of the following year
The Safe Harbor Rule
You avoid the underpayment penalty if you pay at least 100% of your prior year's tax liability (110% if your AGI exceeded $150,000 last year) through withholding and estimated payments. Alternatively, you can pay 90% of your current year's actual liability.
For NJ, the safe harbor is 80% of the current year's tax or 100% of the prior year's tax.
How to Pay
- • Federal: IRS Direct Pay (free) at pay.gov or EFTPS.gov
- • NJ: myNJtax.com (NJ Division of Taxation online portal)
The information provided is for general educational purposes only and does not constitute tax, legal, or investment advice. This content is not intended or written to be used, and cannot be used, for the purpose of avoiding penalties under the Internal Revenue Code. Tax outcomes depend on your specific facts and circumstances. Viewing this material does not create a CPA-client relationship. Personalized advice is provided only through a signed engagement letter.