Quarterly Tax Calculator
Estimate Your C-Corp Federal Taxes in Minutes.
Easily calculate quarterly estimated payments and annual federal tax liability for your corporation.
Enter Your Details
Net Estimated Annual Tax Due*
$0
Based on current inputs
Quarter 1
Amount Due
Due Date
$0
M/DD/YYYY
Quarter 2
Amount Due
Due Date
$0
M/DD/YYYY
Quarter 3
Amount Due
Due Date
$0
M/DD/YYYY
Quarter 4
Amount Due
Due Date
$0
M/DD/YYYY
Need help filing or paying your taxes with doola?
Wondering how to pay? Check our IRS Payments Guide
*Please note that the estimated tax calculator will not provide an exact total of your quarterly tax liability,
account for complex tax situations or unusual circumstances, and replace professional tax advice.
Get a full summary report on your tax dues.
We’ll calculate your quarterly taxes due and send you a complete report with your tax dues and payment due dates by email.
FAQs
Is my C Corp required to make payments?
Yes, if you expect to owe $500 or more in tax for the year.
How much do we need to pay?
To avoid a penalty, pay the lesser of:
- 100% of this year’s expected tax liability, or
- 100% of last year’s total tax (only if there was a tax due in the prior year).
How do we make a payment?
Electronically is mandatory for most. Use:
- EFTPS (to schedule payments).
- IRS Direct Pay (from your bank account).
What if our fiscal year isn’t the calendar year?
The due dates are based on your fiscal year. Payments are due on the 15th day of the 4th, 6th, 9th, and 12th months of your fiscal tax year.
What happens if we miss a deadline?
The IRS will charge an underpayment penalty plus interest. You can calculate this penalty on Form 2220, which is filed with your annual tax return (Form 1120).
Can we just make one large payment at the end of the year?
No. The requirement is for quarterly payments. Making one large payment in the 4th quarter will not eliminate the penalty for underpaying the first three quarters.
What if we have a loss or no tax liability in a quarter?
You may not need to make a payment for that quarter if you annualize your income (using Form 1120-W). However, the standard method is to make equal payments based on your full-year estimate.
How to make the payment?
You must specify the tax year and type of payment. For estimated taxes, you are making a payment for the current tax year (e.g., 2025). You should select “1120” as the form and “Estimated Tax” as the payment type.
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