Quarterly Estimated Tax Calculator

2026 Quarterly Estimated Tax Due Dates

Important: These deadlines are firm. Missing a quarterly payment — even by one day — starts the underpayment penalty clock for that quarter. You cannot make up a missed quarter by doubling a later payment; each quarter is calculated separately.

Who Must Pay Quarterly Estimated Taxes?

You’re required to make quarterly estimated tax payments if both of these apply:

1. You expect to owe at least $1,000 in federal taxes after subtracting any withholding and credits
2. Your withholding and credits will cover less than 90% of your current year tax or less than 100% of last year’s tax (110% if your prior-year AGI exceeded $150,000)

This typically includes:

• Single-member LLC owners (taxed as sole proprietors)
• Multi-member LLC partners (each member pays on their K-1 share)
• S-Corp LLC owners receiving distributions above their reasonable salary
• Freelancers and independent contractors
• Anyone whose employer doesn’t withhold enough (rental income, investment income, etc.)

How to Calculate Estimated Taxes

Your quarterly estimated tax has two components: self-employment (SE) tax and federal income tax. Most calculators skip the SE tax — don’t let that catch you short.

Step 1: Calculate Self-Employment Tax

SE tax funds Social Security and Medicare. You pay both the employee and employer share:

• SE net earnings = net profit × 92.35% (the 7.65% reduction mirrors the employer share deduction)
• Social Security tax = SE net × 12.4%, capped at the 2025 wage base of $176,100
• Medicare tax = SE net × 2.9% (no cap)
• Additional Medicare surtax = 0.9% on SE net above $200,000 (single) or $250,000 (MFJ)
• SE deduction: You can deduct half of SE tax when calculating your AGI — this reduces your income tax

Example: $90,000 net profit → SE net = $83,115 → Social Security = $10,306 → Medicare = $2,411 → SE tax = $12,717 → deductible half = $6,359

Step 2: Calculate Federal Income Tax

Apply 2025 federal tax brackets to your taxable income (AGI minus standard deduction):

2025 standard deductions: $15,000 (single) · $30,000 (MFJ) · $22,500 (HOH). The 2026 figures are typically adjusted 2–3% for inflation — check IRS.gov or use the calculator above which applies the 2025 figures as a close estimate.

Step 3: Divide by 4

Divide your total annual tax estimate (SE tax + income tax) by 4. Each quarter gets an equal payment — though you can also use the annualized income installment method (Form 2210, Schedule AI) if your income is seasonal.

Safe Harbor Rules — How to Avoid Underpayment Penalties

The IRS won’t charge underpayment penalties if you meet one of three safe harbor thresholds by year end:

Which safe harbor to use: If your income is significantly higher this year than last, Safe Harbor 2/3 (prior year method) is often the smarter choice. You pay based on a known, fixed number regardless of how much you earn this year — no guesswork needed. If your income is lower this year, Safe Harbor 1 (90% current year) usually means smaller payments.

Caution: Safe harbor prevents penalties but doesn’t eliminate the tax owed. If you use the prior-year method and your income grew substantially, you’ll owe a large balance when you file in April — plan your cash flow accordingly.

Underpayment Penalties Explained

If you miss a quarterly payment or pay too little, the IRS charges an underpayment penalty calculated as follows:

• Rate: The federal short-term rate + 3%, set quarterly by the IRS. As of early 2026, this is approximately 7–8% annualized — check IRS.gov for the current quarter’s rate
• Calculation basis: Applied to the underpaid amount for each day it’s underpaid within the quarter
• Per-quarter calculation: Each quarter is evaluated independently. Overpaying Q1 does not offset underpaying Q2
• How to pay: The penalty is typically calculated automatically on Form 2210 when you file your annual return. You can also request a waiver if the underpayment was due to a casualty, disaster, or unusual circumstance

Example: You owe $5,000/quarter but pay nothing until Q3. The Q1 shortfall ($5,000) accrues penalties from April 16 through the date you pay — roughly $100–$150 for a 3-month underpayment at an 8% annual rate. Small but avoidable.

Real-World Example: LLC Owner, $95,000 Net Income

Sarah is a single marketing consultant with an LLC. She projects $95,000 in net income for 2026 with no other income. Here’s her calculation:

• SE net earnings: $95,000 × 92.35% = $87,733
• SE tax: ($87,733 × 12.4%) + ($87,733 × 2.9%) = $10,879 + $2,544 = $13,423
• SE deduction: $13,423 / 2 = $6,712 subtracted from AGI
• Taxable income: $95,000 − $6,712 − $15,000 (standard deduction) = $73,288
• Federal income tax (2025 brackets, single): $1,193 + $4,389 + $5,465 = $11,047
• Total annual tax: $13,423 + $11,047 = $24,470
• Quarterly payment: $24,470 / 4 = $6,118/quarter

Sarah’s Q2 payment of $6,118 is due June 16. Her prior year tax was $9,200 (prior-year AGI under $150,000), so her safe harbor is $9,200/4 = $2,300/quarter — well below her current obligation. She should pay the full $6,118 to avoid a large April balance.

How to Pay Quarterly Estimated Taxes

• IRS Direct Pay (free): directpay.irs.gov — pay from a bank account, no registration required. Schedule a payment up to 30 days in advance
• EFTPS (Electronic Federal Tax Payment System): Best for recurring payments. Requires registration but allows scheduling future quarters in advance
• IRS2Go app: Mobile Direct Pay access
• Mail a check: Payable to “United States Treasury” with your SSN/EIN and “2026 Form 1040-ES” in the memo line. Must be postmarked by the due date
• Credit/debit card: Via IRS-approved processors (small fee applies — typically 1.75–1.99%)

Frequently Asked Questions

When are 2026 quarterly estimated taxes due?

Q1: April 15, 2026 (passed) | Q2: June 16, 2026 (June 15 is Sunday) | Q3: September 15, 2026 | Q4: January 15, 2027. These dates are fixed — mark them in your calendar now.

Who needs to pay quarterly estimated taxes?

Anyone who expects to owe $1,000 or more in federal taxes and doesn’t have sufficient withholding — typically self-employed individuals, LLC owners, freelancers, and independent contractors.

What is the 2026 Social Security wage base for SE tax?

$176,100. You pay 12.4% Social Security tax on SE net earnings up to this amount. There’s no cap on the 2.9% Medicare portion. High earners above $200,000 (single) or $250,000 (MFJ) also owe an additional 0.9% Medicare surtax. The wage base adjusts annually — verify the 2026 limit at IRS.gov.

Can I skip a quarterly payment if I’ll meet safe harbor by year end?

Technically yes, but safe harbor is evaluated per quarter, not annually. Missing Q2 and overpaying Q3 doesn’t eliminate the Q2 penalty. You need to distribute payments across quarters to get full penalty protection.

What if my income varies significantly quarter to quarter?

Use the annualized income installment method (Form 2210, Schedule AI). Instead of paying equal quarters, you calculate each payment based on actual income earned through that quarter. This avoids overpaying early in the year if your income is back-loaded (e.g., high Q4 holiday revenue).

Do single-member LLCs pay quarterly estimated taxes?

Yes. Single-member LLCs are disregarded entities for federal tax purposes — the owner pays estimated taxes on Schedule C income through their Form 1040-ES. The LLC itself doesn’t file estimated taxes.

How do multi-member LLCs handle estimated taxes?

The LLC files a partnership return (Form 1065) but pays no entity-level federal tax. Each member receives a K-1 and makes individual estimated payments based on their share of income and personal tax situation.

Can I deduct LLC formation costs?

Yes — up to $5,000 in organizational costs in year one, with amounts over $5,000 amortized over 15 years. These deductions reduce your net income and therefore your estimated tax obligation.

Expert Tips

• Set aside 28–32% automatically: Every time a client pays you, transfer that percentage to a dedicated tax savings account. This removes the pain of quarterly payment day — the money is already set aside
• Recalculate at each quarter: If you land a major contract in Q2, bump Q3 and Q4 payments accordingly. The IRS allows adjustments going forward without penalty as long as you stay within safe harbor
• Schedule EFTPS payments in advance: Set up Q3 and Q4 payments now while the discipline is fresh. EFTPS lets you schedule up to a year out
• Track state separately: Most states that have income tax also require quarterly estimated payments, with different thresholds and schedules. California requires payments if you expect to owe more than $500; many other states use similar thresholds. These are separate checks/payments from your federal obligation
• Deduct the right things before calculating: Home office, health insurance premiums, retirement contributions (SEP-IRA, Solo 401k), and vehicle expenses all reduce your net income — and therefore your quarterly tax obligation. Run these through your accounting software before each quarterly calculation

Use the calculator at the top of this page for your personalized 2026 quarterly payment amounts. For complex situations — S-Corp elections, significant investments, or multi-state income — consult a CPA. The cost of an hour of professional advice typically saves multiples in optimized deductions and avoided penalties.