If you’re self-employed, a freelancer, or earn 1099 income, the IRS expects you to pay tax throughout the year instead of all at once in April — that’s what estimated quarterly taxes are for. This estimated quarterly tax calculator figures out your full-year tax bill (self-employment tax plus federal income tax) and splits it into four quarterly payments, complete with each payment’s actual due date. Enter your expected annual net profit below to see what you owe and when.
How This Estimated Quarterly Tax Calculator Works
This calculator combines two tax calculations most self-employed people need to account for separately, then splits the total into four equal quarterly payments:
- Self-employment tax: 15.3% covering Social Security and Medicare, calculated on 92.35% of your net profit
- Federal income tax: calculated using the 2026 tax brackets, after subtracting the standard deduction and half of your self-employment tax (which is deductible)
Add those two together for your total estimated annual tax, then divide by four for your quarterly payment amount.
Estimated Quarterly Tax Calculator Example: $80,000 Net Profit
Here’s a full walkthrough for a single filer expecting $80,000 in net self-employment profit for the year:
- Self-employment tax: $11,304
- Federal income tax: $7,527
- Total estimated annual tax: $18,830
- Quarterly payment: $18,830 ÷ 4 = $4,708
That $4,708 figure is what this person would send to the IRS four times during the year, rather than owing the full $18,830 in one lump sum at tax filing time.
2026 Estimated Tax Due Dates
The IRS splits the year into four payment periods, and the due dates don’t line up with regular calendar quarters — Q4 in particular has an unusually short gap before its due date:
- Q1 (income from January 1 – March 31): due April 15, 2026
- Q2 (income from April 1 – May 31): due June 15, 2026
- Q3 (income from June 1 – August 31): due September 15, 2026
- Q4 (income from September 1 – December 31): due January 15, 2027
If a due date falls on a weekend or federal holiday, the deadline shifts to the next business day.
Do You Need to Pay Estimated Quarterly Taxes?
In principle, you are required to make estimated tax payments if you anticipate a tax liability of at least $1,000 for the current year (after deducting taxes already withheld at the source and refundable tax credits). Many taxpayers avoid penalties by relying on the “Safe Harbor” rule: they pay either 90% of the tax owed for the current year or 100% of the tax owed for the previous year (or 110% if their income from the previous year exceeded $150,000), whichever amount is lower.
Since this tool directly calculates your projected tax liability for the current year rather than applying the “Safe Harbor” rule, you should view the result as a reliable initial estimate rather than the exact minimum amount required. You can find detailed official information regarding estimated tax payments directly from the IRS.
If you wish to examine the self-employment tax portion of this overall estimate in greater detail, our self-employment tax calculator breaks down that specific component and accounts for the potential impact of income earned as an employee (W-2 income).
Frequently Asked Questions
Who needs to make quarterly estimated tax payments?
Generally, anyone who expects to owe at least $1,000 in taxes for the current year—after subtracting tax withholdings and tax credits—must make these payments. This typically applies to freelancers, self-employed individuals, and sole proprietors whose taxes are not automatically withheld from a paycheck by an employer.
When are estimated payments due for 2026?
They are due on April 15, June 15, and September 15, 2026, as well as January 15, 2027, for the fourth quarter; note that these periods do not align exactly with calendar quarters.
What happens if I don’t make estimated payments?
The IRS may impose an underpayment penalty. This penalty is calculated based on the amount owed and the length of the delay, even if you pay the full amount when filing your final tax return.
What is the “Safe Harbor” rule for estimated payments?
If you pay at least 90% of the tax owed for the current year or 100% of the tax owed for the previous year (or 110% if your income from the previous year exceeded $150,000)—whichever amount is lower—you will generally avoid underpayment penalties.
Can I make unequal payments instead of four equal installments?
Yes, the IRS allows unequal payments, provided that the payment for each quarter accurately reflects the income earned during that period. However, making uniform payments is simpler if your income remains relatively steady throughout the year.
Frequently Asked Questions
Who needs to make quarterly estimated tax payments?
Generally, anyone who expects to owe at least $1,000 in taxes for the current year—after subtracting tax withholdings and tax credits—must make quarterly payments. This estimated quarterly tax calculator is built for freelancers, self-employed individuals, and sole proprietors whose taxes are not automatically withheld from a paycheck by an employer.
When are estimated payments due for 2026?
They are due on April 15, June 15, and September 15, 2026, as well as January 15, 2027, for the fourth quarter; note that these periods do not align exactly with calendar quarters.
What happens if I don’t make estimated payments?
The IRS may impose an underpayment penalty. This penalty is calculated based on the amount owed and the length of the delay, even if you pay the full amount when filing your final tax return.
What is the “Safe Harbor” rule for estimated payments?
If you pay at least 90% of the tax owed for the current year or 100% of the tax owed for the previous year (or 110% if your income from the previous year exceeded $150,000)—whichever amount is lower—you will generally avoid underpayment penalties.
Can I make unequal payments instead of four equal installments?
Yes, the IRS allows unequal payments, provided that the payment for each quarter accurately reflects the income earned during that period. However, making uniform payments is simpler if your income remains relatively steady throughout the year.