Calculate your quarterly estimated tax payments to avoid IRS underpayment penalties. Supports current-year and safe harbor methods.
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A Texas-based freelance graphic designer earns $140,000 net profit/year from client work. She's evaluating whether to stay as a sole proprietor, form an LLC, or elect S-Corp status to reduce self-employment taxes.
Takeaway: S-Corp saves $8,300/year but adds ~$1,500-$3,000 in accounting fees (payroll, extra returns). Break-even is around $80-90K net profit. Below that, the overhead eats the savings. Texas has no state income tax, so the benefit is purely federal SE savings.
LLC annual fees range from $0 (Ohio) to $800 minimum (California, even for zero-revenue LLCs). Delaware C-Corp is standard for VC-backed companies but adds registered agent costs (~$300/yr) for out-of-state entities. The "best" structure is state-specific.
S-Corps cannot have more than 100 shareholders, cannot have non-US shareholders, and cannot have corporate shareholders. Violating these rules (e.g., adding a foreign investor) terminates S-Corp status retroactively, potentially creating a large unexpected tax event.
The IRS requires S-Corp owner-employees to pay themselves a "reasonable salary" before taking distributions. There is no fixed formula — the IRS looks at industry benchmarks, duties, and hours worked. Setting the salary too low is a common audit trigger for S-Corps.
Business break-even models track revenue vs. direct costs. They rarely factor in the owner's time as a cost. If you're working 60 hours/week at imputed $50/hour, your "profitable" business may be paying you $12/hour after the opportunity cost calculation.
Break-Even CalculatorA service business valued on EBITDA multiples (2-4×) gets a very different number than one valued on SDE (seller's discretionary earnings) or discounted cash flow. Buyers and sellers typically use different methods to argue their preferred price. This calculator uses a single method.
Business Valuation CalculatorBased on your inputs
per quarter
| Q1 Due — April 15 | $4,388 |
|---|---|
| Q2 Due — June 15 | $4,388 |
| Q3 Due — Sept 15 | $4,388 |
| Q4 Due — Jan 15 | $4,388 |
| Estimated Total Tax | $19,501 |
| SE Tax Component | $11,304 |
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Q1 (Jan–Mar): April 15. Q2 (Apr–May): June 15. Q3 (Jun–Aug): September 15. Q4 (Sep–Dec): January 15 of the following year.
Pay either 100% of last year's tax liability (110% if AGI > $150k) OR 90% of this year's expected tax. The safe harbor method uses prior year's liability.
The IRS charges an underpayment penalty (currently ~8% annualized). Pay as soon as possible to minimize the penalty.
Yes if you expect to owe $1,000+ after subtracting withholding. W-2 employees with side income may also need to make estimates.
You avoid penalties by paying at least 100% of last year's tax liability (110% if AGI exceeded $150,000) or 90% of current year's tax, whichever is less.
Technically yes, but you may owe underpayment penalties for the earlier quarters you missed. The IRS expects roughly equal quarterly payments. The annualized income installment method can reduce penalties for uneven income.
Pay online at IRS.gov/payments using Direct Pay or EFTPS. You can also mail Form 1040-ES with a check. Most states have separate estimated tax systems requiring additional payments.
This method calculates estimated tax based on income actually earned in each quarter rather than dividing the annual estimate by four. It benefits freelancers with seasonal or uneven income patterns.
Yes. Most states with income tax require separate estimated tax payments on their own schedule. Some states follow the federal due dates; others have different deadlines and forms.
Project your annual income and deductions, then calculate self-employment tax and income tax on that estimate. Divide the total by four for equal payments. Adjust each quarter as actual income becomes clearer to avoid overpaying or underpaying.
Current Year: Pay 90% of expected tax ÷ 4
Safe Harbor: Pay 100% of prior year tax ÷ 4
Every formula on this page traces to a federal agency, central bank, or peer-reviewed institution. We cite the rule-makers, not secondhand blogs.
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Calculations are for educational purposes only. Consult a qualified financial advisor for personalized advice.