Estimated taxes are the payments a business or its owner makes during the year, instead of waiting for the return, to cover income tax and self-employment tax that nobody is withholding. If you run a sole proprietorship, a partnership, an S corporation or a C corporation, you probably owe them once you expect a tax bill of $1,000 (owners) or $500 (corporations) at year-end. You calculate each payment from projected profit or from last year's tax, pay it by the quarterly deadline, and avoid penalties by hitting a safe-harbor number.
This guide walks through who has to pay, how the rules differ by entity type, three ways to calculate a payment, the deadlines, the penalty, and the state-level surprises that catch growing companies.
TL;DR
- Sole proprietors, partners and S corporation shareholders generally must make estimated payments if they expect to owe $1,000 or more. Corporations generally must if they expect to owe $500 or more.
- Payments fall on the 15th of the 4th, 6th and 9th months of the tax year, plus the 12th month for corporations or the 1st month of the next year for individuals.
- You can avoid the penalty by paying 90% of this year's tax or 100% of last year's, whichever is smaller. The prior-year figure rises to 110% for higher earners.
- Partnerships and S corporations pass the obligation to the owners, so the payment usually comes from a personal account, not the company's.
- State estimated taxes run on their own rules, so check each state where you operate.
Table of Contents
- Who has to pay estimated taxes
- Quick comparison by entity type
- How to calculate your estimated payments
- When estimated taxes are due
- How to pay
- What happens if you underpay or miss a payment
- State estimated taxes
- Common mistakes that make estimated taxes harder
- A simple quarterly routine
- Our perspective
- Getting help with estimated taxes
- FAQ
- Sources
Who has to pay estimated taxes
The IRS explains that estimated taxes are regular payments toward income and self-employment taxes as you earn the money. Sole proprietors, partners, S corporation shareholders and corporations generally have to make them if they expect to owe at least $1,000 (individuals) or $500 (corporations) by year-end.
The logic is simple. An employee has tax taken out of every paycheck. A business owner has no employer doing that, so the system asks the owner to prepay.
Sole proprietors and single-member LLCs
If you file a Schedule C, you are paying tax on profit, not on what you pay yourself, and nobody withholds anything. Your payments cover both income tax and self-employment tax. You estimate them on Form 1040-ES, which the IRS says is the form individuals, including sole proprietors, partners and S corporation shareholders use to project adjusted gross income, taxable income, deductions, credits and tax.
Partners and LLC members taxed as partnerships
A partnership does not pay income tax on its own earnings. Per the IRS business tax overview, the partners are personally responsible for the tax, including estimated tax, on their individual returns. And because partners are not employees, the partnership does not withhold from their distributions. That means a partner who takes a draw of cash during the year has had no tax taken from it. The whole estimated payment is the partner's job.
S corporation shareholders
Shareholders are in the same boat as partners for their share of pass-through income. There is one more wrinkle: the IRS notes that an S corporation itself sometimes has to make estimated payments when it owes $500 or more in certain taxes, such as tax on built-in gains, excess net passive income or investment credit recapture. Most small S corporations never hit those, but if yours acquired a C corporation's history or has significant passive income, ask your CPA.
Salary matters here too. Wages paid to a shareholder-employee go through payroll withholding, which counts toward the owner's yearly tax. Setting that salary at a defensible level is a separate issue, covered in our look at S corporation reasonable salary.
C corporations
A C corporation pays its own income tax and makes its own estimated payments, generally when it expects to owe $500 or more. Corporations figure whether they owe an underpayment penalty on Form 2220.
Quick comparison by entity type
| Business structure | Who pays the estimated tax | Typical form for estimating | Threshold that triggers it |
|---|---|---|---|
| Sole proprietorship / single-member LLC | The owner | Form 1040-ES | $1,000 expected tax |
| Partnership / multi-member LLC | Each partner personally | Form 1040-ES | $1,000 expected tax |
| S corporation | Each shareholder (and the entity in limited cases) | Form 1040-ES | $1,000 for shareholders; $500 for the entity cases |
| C corporation | The corporation | Form 2220 for penalty testing | $500 expected tax |
Thresholds and forms come from the IRS pages cited above. Always check the current-year instructions before you pay.
How to calculate your estimated payments
There is no single formula. You pick the method that matches how predictable your income is. All three below are common.
Method 1: Project this year's tax
This is the most accurate and the most work. You forecast revenue and expenses for the year, estimate taxable income, apply the tax rates and credits, add self-employment tax if it applies, and divide by four (or adjust by period).
The steps:
- Pull a year-to-date profit and loss from your books.
- Project the rest of the year, adjusting for seasonality, big purchases and known price changes.
- Subtract deductions you expect to take, including the standard or itemized deduction on the personal side.
- Compute tax, then subtract any withholding or credits (for example, a spouse's W-2 withholding).
- Divide what remains across the remaining due dates.
This method only works if your books are current. If your last reconciliation was in March, the forecast is a guess.
Method 2: Use last year's tax (the safe harbor)
The simplest approach is to divide last year's total tax by four and pay that each quarter. The IRS says most taxpayers avoid penalties if they owe under $1,000 after withholding and credits, or if they pay 90% of the current-year tax or 100% of the prior-year tax, whichever is smaller.
For higher earners the prior-year percentage changes. If your prior-year adjusted gross income was over $150,000 ($75,000 if married filing separately), the Form 1040-ES instructions raise the safe-harbor figure to 110% of last year's tax.
A worked illustration with made-up numbers: suppose an owner's total tax last year was $40,000.
- With prior-year AGI under $150,000, the safe harbor is 100% of $40,000, or $10,000 per quarter.
- With prior-year AGI above $150,000, the safe harbor is 110%, or $44,000 for the year, which is $11,000 per quarter.
If this year's profit is much higher, you may owe a balance with the return. That is fine from a penalty standpoint, but you need the cash for it, which is why we suggest setting aside a percentage of every deposit.
Method 3: Annualize uneven income
Seasonal businesses are the reason this exists. If you earn most of your profit in the fourth quarter, paying one quarter of the year's tax in April overpays early. The IRS notes that taxpayers with uneven income may qualify for annualization, which matches each payment to what you actually earned up to that date. It takes more bookkeeping, since you need clean period-by-period profit numbers, but it can keep cash in the business longer.
What about large corporations?
Corporations that count as "large" under the tax code face special rules when using the prior year's tax to figure the first required installment. If your company is near that size, do not assume the individual safe harbor logic carries over. Have your tax preparer run Form 2220 on the numbers.
When estimated taxes are due
For individuals, including owners of pass-through businesses, the IRS says payments are generally due on the 15th day of the 4th, 6th and 9th months of the tax year, and the 15th day of the 1st month of the following year. For a calendar-year taxpayer, that means April 15, June 15, September 15 and January 15.
Corporations follow a slightly different pattern. Their payments are typically due on the 15th day of the 4th, 6th, 9th and 12th months of the tax year, which for a calendar-year corporation is April 15, June 15, September 15 and December 15.
Two practical notes:
- Weekends and holidays. When a due date lands on a Saturday, Sunday or legal holiday, the payment is on time if made on the next business day.
- The periods are not equal. The "quarters" run unevenly: the second period is only two months long. Do not wait for the calendar quarter to end before planning.
Fiscal-year entities shift all of these dates to match their own year. For the other filing dates that sit around these payments, see our rundown of U.S. business tax deadlines.
How to pay
The IRS accepts estimated payments electronically, and most owners find a scheduled online payment easiest. Individuals can also mail a check with a Form 1040-ES voucher. Whichever route you use, record each payment with its date and the tax year it applies to. Misapplied payments are one of the more common cleanup jobs we see in a bookkeeping file.
A good habit is to create a separate bank account for tax money. Each time revenue lands, move a set percentage into it. When a deadline comes, the cash is already there, and your operating account never looks richer than it is. This ties directly into broader cash flow management.
What happens if you underpay or miss a payment
The consequence is an underpayment penalty. The IRS states that if you do not pay enough during the year, or your payments are late, you may owe a penalty, even if you are due a refund when you file. The penalty can be waived in limited circumstances such as a casualty, disaster or other unusual circumstance, or in retirement or disability cases.
A few things follow from that:
- The penalty is calculated by period, so a big payment in January does not erase a missed one in April.
- Corporations use Form 2220 to test for the penalty, but they generally do not have to file it with the return. The IRS calculates the penalty and sends a notice. That is a notice you do not want to find in the mail.
- A penalty is not the same as the tax itself. You still owe the full balance with the return.
If you have already missed a payment, the fix is to catch up now rather than wait for the next due date. Then ask your accountant whether annualizing or a waiver request fits your facts.
State estimated taxes
Federal rules are only half the picture. Most states with an income or franchise tax have their own estimated payment schedules, thresholds and forms, and they do not always match the IRS.
California is a useful example. The state requires corporations that are incorporated, qualified or doing business there to make franchise or income tax estimated payments, due on the 15th day of the 4th, 6th, 9th and 12th months of the tax year. When a state due date lands on a weekend or holiday, the deadline moves to the next regular business day, the same way the federal one does.
If you operate in several states, nexus rules can create filing and payment duties you did not plan for. Make a list of every state where you have employees, inventory or meaningful sales, and confirm each state's requirements on its tax agency's site.
Common mistakes that make estimated taxes harder
- Paying from guesswork. Without current books, projections drift and payments are either too small or an unnecessary strain on cash.
- Forgetting the owner's other income. A spouse's wages, investment income or a side job changes the total. Withholding on other income can also be increased instead of making payments, as the IRS notes for business owners starting out.
- Treating the entity and the owner as one. In a partnership or S corporation, the company's bank balance is not the owner's tax bill. Distributions need a tax plan.
- Ignoring growth years. The prior-year safe harbor feels easy until profit doubles. Pair it with a mid-year projection.
- Skipping the state. A federal payment does not satisfy a state account.
Many of these overlap with the planning errors we describe in corporate tax planning mistakes. For a broader strategy, our tax planning guide for business owners covers how estimated payments fit into a full-year plan.
A simple quarterly routine
Owners who never get surprised by a tax bill tend to do the same small things each period:
- Close the books for the prior month within a couple of weeks.
- Review year-to-date profit against the forecast.
- Recalculate the estimate, and compare it with the safe-harbor figure.
- Pay by the deadline and log the confirmation.
- Move the next period's tax reserve into a separate account.
This fits neatly into a quarterly financial review, and it is much easier if you also keep a rolling cash flow projection.
Our perspective
Most estimated tax trouble we see is not a tax problem. It is a bookkeeping problem that shows up as a tax problem. An owner who cannot say what profit was through August cannot estimate a September payment, so they fall back on last year's number and hope.
We think the better order is books first, forecast second, payment third. When the records are reconciled monthly, the estimate takes minutes, and the owner can choose deliberately between the safe-harbor method and a projection instead of defaulting to whichever is easier. For businesses with irregular income, that choice can change when cash leaves the company.
We also push owners to treat tax as a budget line, not an event. A fractional CFO view of the year, with revenue, margin, payroll and tax reserves in one forecast, means the April payment is never a surprise. That is the reason we pair accounting work with CFO-level oversight, and why we work with both for-profit and non-profit organizations: the discipline is the same even when the tax rules differ. A modular setup lets a company take only the support it needs, without hiring a full-time executive.
— Angelica
Getting help with estimated taxes
If your books are behind, your entity structure is changing, or you are unsure whether to use a projection or a safe harbor, we can help. Our team handles accounting and bookkeeping, including cleanup and tax coordination, and our fractional CFO services build the forecasts that estimated payments depend on. We coordinate with your tax preparer so the numbers are ready before each deadline. Contact us through the site to talk through your situation.
FAQ
Do I have to pay estimated taxes if my business lost money?
Generally no. The requirement turns on whether you expect to owe tax, not on whether you run a business. If you expect to owe under the IRS thresholds ($1,000 for individuals, $500 for corporations) after withholding and credits, estimated payments are not required. Your other income, such as a spouse's wages or investments, still counts toward the total.
Does an LLC pay estimated taxes?
It depends on how the LLC is taxed. A single-member LLC taxed as a sole proprietorship, or a multi-member LLC taxed as a partnership, passes the tax to its owners, who pay estimated taxes personally. An LLC that elects corporate treatment follows the corporate rules. Check your election with your tax preparer.
What is the easiest way to avoid an underpayment penalty?
The prior-year safe harbor. Pay at least 100% of last year's total tax (110% if your prior-year AGI was above $150,000, or $75,000 if married filing separately) in equal installments by the due dates. If you instead pay 90% of the current year's tax, you also qualify. The IRS rules say the smaller of the 90% and prior-year tests applies.
What if a due date falls on a weekend?
The payment is on time if you make it on the next business day. The same holds for legal holidays. State agencies such as California's follow a similar rule, but confirm with the state you pay in.
Sources
- Estimated taxes, Internal Revenue Service
- Businesses, estimated tax FAQ, Internal Revenue Service
- Individuals, estimated tax FAQ, Internal Revenue Service
- Business taxes, Internal Revenue Service
- 2026 Form 1040-ES, Internal Revenue Service
- 2025 Instructions for Form 2220, Internal Revenue Service
- Starting or ending a business, Internal Revenue Service
- Estimate Business Taxes and Prepayments, California Taxes