Estimated Quarterly Tax Calculator
Data Notice: Figures, rates, and statistics cited in this article are based on the most recent available data at time of writing and may reflect projections or prior-year figures. Always verify current numbers with official sources before making financial, medical, or educational decisions.
Estimated Quarterly Tax Calculator
Tax information is for educational purposes only and does not constitute tax advice. Consult a licensed tax professional for your specific situation.
Use this calculator to determine how much you should pay in quarterly estimated taxes for 2026. Proper quarterly payments prevent underpayment penalties and help you manage cash flow throughout the year.
Calculate Your Quarterly Payments
[CALCULATOR WIDGET PLACEHOLDER]
Enter the following:
- Expected total income for 2026 (all sources)
- Expected business expenses (if self-employed)
- Filing status
- Number of dependents
- Expected W-2 withholding (if you also have a day job)
- Last year’s total tax liability
- Last year’s AGI (to determine if 110% safe harbor applies)
The calculator shows:
- Estimated total 2026 tax liability (income tax + SE tax)
- Minus expected withholding
- Remaining tax due through estimated payments
- Quarterly payment amount (divided by 4 or by remaining quarters)
- Safe harbor amount comparison (100% or 110% of prior year)
- Recommended payment per quarter
2026 Quarterly Payment Deadlines
| Quarter | Income Period | Payment Due |
|---|---|---|
| Q1 | January – March | April 15, 2026 |
| Q2 | April – May | June 16, 2026 |
| Q3 | June – August | September 15, 2026 |
| Q4 | September – December | January 15, 2027 |
Calculation Methods
Method 1: Safe Harbor (Simplest)
Pay the lesser of:
- 90% of your 2026 expected tax, or
- 100% of your 2025 total tax (110% if 2025 AGI exceeded $150,000)
Divide that amount by four and pay each quarter. This guarantees no underpayment penalty, even if your actual 2026 tax is higher.
Method 2: Current Year Estimate
Estimate your 2026 income and calculate the expected tax. Subtract expected withholding. Divide the remaining amount by four (or by the number of remaining quarters).
Method 3: Annualized Income Method
If your income varies significantly by quarter (seasonal business, large one-time gains), calculate each quarter’s payment based on actual income earned during that period. This requires Form 2210 Schedule AI at filing time.
Quick Reference: Common Scenarios
Freelancer, $60,000 Net Income, No W-2 Job
| Item | Amount |
|---|---|
| Estimated income tax | $5,300 |
| Estimated SE tax | $8,478 |
| Half-SE-tax deduction effect | -$615 |
| Total estimated tax | $13,163 |
| Quarterly payment | $3,291 |
Side Gig, $20,000 Net + $60,000 W-2 Salary
| Item | Amount |
|---|---|
| Additional income tax on $20K | $4,400 |
| SE tax on $20K | $2,826 |
| W-2 withholding covers salary tax | Included in W-2 |
| Additional quarterly payment | $1,807 |
Alternatively, increase W-2 withholding by $302/month to cover the side gig tax.
High-Earning Consultant, $200,000 Net Income
| Item | Amount |
|---|---|
| Estimated income tax | $33,400 |
| Estimated SE tax | $25,700 |
| Half-SE-tax deduction effect | -$3,700 |
| Total estimated tax | $55,400 |
| Quarterly payment | $13,850 |
Tips for Accurate Estimates
- Review last year’s return as a starting point
- Account for income changes — new clients, lost clients, rate changes
- Factor in new deductions — SEP IRA contributions, new equipment, home office
- Recalculate mid-year — Adjust Q3 and Q4 if income is higher or lower than expected
- Include state estimates — Most income-tax states require their own quarterly payments
How to Make Payments
| Method | Cost | Best For |
|---|---|---|
| IRS Direct Pay | Free | One-time payments |
| EFTPS | Free | Recurring scheduled payments |
| Credit card | 1.85%–1.98% fee | Earning credit card rewards (do the math) |
| Check with Form 1040-ES voucher | Free | Those who prefer paper |
See Quarterly Estimated Tax Payments: When and How Much for detailed instructions.
Key Takeaways
- Quarterly payments are required if you expect to owe $1,000+ after withholding
- The safe harbor method (100% or 110% of prior year tax) is the simplest way to avoid penalties
- Payments are due April 15, June 16, September 15, and January 15
- Increasing W-2 withholding is an alternative to quarterly payments for those with side income
- Recalculate mid-year if your income trajectory changes significantly
Next Steps
- Read the full guide: Quarterly Estimated Tax Payments: When and How Much
- Calculate your full tax picture: Self-Employment Tax Calculator
- Review all deadlines: Tax Filing Deadlines 2026: Every Important Date
- Understand your SE tax obligations: Self-Employment Tax Guide: Everything Freelancers Need to Know
- Get professional help with tax planning: Find a CPA Near You