Tax planning
Quarterly estimated taxes 2026: who pays, when, and how
Last reviewed: May 17, 2026 by Amanda Emerdinger, PTIN.
A simple framework for figuring out, paying, and tracking quarterly estimated taxes for self-employed people and small business owners.
By Amanda Emerdinger | Published April 16, 2026
If you expect to owe one thousand dollars or more in federal income tax for the year after withholding, the IRS requires you to pay that tax in quarterly installments. Most self employed people, LLC owners, S corporation owners, and small business owners taking draws fall into this category. Quarterly payments are the same tax you already owe, paid in four installments instead of one. Federal deadlines for tax year 2026 are April 15, June 15, September 15, and January 15, 2027.
What is a quarterly tax payment?
A quarterly estimated tax payment is a partial payment of your annual federal (and often state) income tax, paid four times per year instead of all at once at filing time. It applies to income that does not have taxes withheld from it, including self employment income, LLC owner draws, S corporation distributions, rental income, and meaningful investment gains.
The IRS uses a pay as you go system. W-2 employees pay through paycheck withholding. Everyone else pays through quarterly estimated taxes. The total tax bill at filing time is the same. The quarterly structure just spreads that payment across the year so the IRS is not waiting until April for income that was earned the prior January.
Quarterly tax payments include federal income tax. For self employed people, they also include self employment tax (Social Security and Medicare). State income tax follows its own quarterly schedule for states that have an income tax, with most state deadlines matching the federal calendar.
Who has to file quarterly taxes?
If you expect to owe one thousand dollars or more in federal income tax for the year after withholding, the IRS generally expects you to pay in quarterly. That covers most self employed people, most small business owners, and anyone with meaningful income that does not have taxes withheld.
Traditional employees have federal and state taxes pulled out of every paycheck. The IRS is already being paid all year long on their behalf. Most of them do not owe much at filing time because withholding has already covered it.
Self employed folks, S corporation owners taking distributions, rental property owners, investors with meaningful capital gains, and small business owners taking draws are in a different boat. No one is withholding anything for them. The IRS wants to be paid as the income is earned, not in one big lump in April.
That is the whole purpose of quarterly estimated tax. It is not a penalty or a special kind of tax. It is the same tax you already owe, just paid in four installments instead of one.
Do LLCs have to pay quarterly taxes?
Most single member LLC owners and multi member LLC partners pay quarterly estimated taxes on their share of the LLC's net income. The LLC itself does not pay federal income tax under default pass through treatment. The income flows to the owners' personal returns, and the owners are the ones the IRS expects to make quarterly estimates.
By default, a single member LLC is treated as a disregarded entity for federal tax. The income and expenses land on the owner's Schedule C and combine with the rest of the owner's tax picture. A multi member LLC files Form 1065 and issues K-1s to the partners, who then pay tax on their share of the income on their personal returns.
Either way, no taxes are withheld at the LLC level under default rules. If the owner expects to owe one thousand dollars or more in federal income tax for the year, the owner needs to make quarterly LLC estimated tax payments. The same rule applies for state income tax in states that levy it.
An LLC that has elected S corporation status follows a different model. The owner pays themselves a reasonable salary with W-2 withholding, and the rest of the profit is a distribution. The salary portion gets withholding done for it. The distribution portion is income to the owner with no withholding, so the owner still needs quarterly estimated payments to cover the income tax on those distributions. See the S corporation section below for more detail.
Are quarterly estimated tax payments mandatory or required?
Quarterly estimated taxes are required, not optional, once you cross the IRS one thousand dollar threshold. Failure to pay triggers an underpayment penalty calculated as interest on what should have been paid in. The penalty is time based and accrues until the missing payment is made.
The legal mechanism is in Internal Revenue Code section 6654. If your total tax for the year minus withholding minus refundable credits is one thousand dollars or more, and you did not pay enough through quarterly estimates to meet a safe harbor, the IRS will assess an underpayment penalty on your filed return.
The penalty is calculated on a quarter by quarter basis. Missing one quarter does not retroactively make the prior quarters wrong, but it does start the interest meter on the missing amount. Catching up by the next quarter limits the damage. Waiting until filing time the following April maximizes it.
When are quarterly estimated taxes due in 2026?
The four federal deadlines for tax year 2026 are April 15, June 15, September 15, and January 15, 2027. State deadlines usually match but not always. A few states such as California have their own calendars and a few states have no income tax at all.
Those dates shift a day or two when they fall on a weekend or a holiday, but the pattern is consistent year to year. The first payment of each tax year is due in mid April, at the same time last year's return is due.
One piece people miss. The June 15 deadline is only two months after April 15, not three. That is a quirk of how the IRS laid out the schedule. Payments three and four give you the normal three months in between.
Q4 taxes (fourth quarter estimated tax)
Q4 quarterly taxes refers to the fourth and final estimated tax installment for the tax year, due January 15 of the following year. For tax year 2026, Q4 is due January 15, 2027. The Q4 payment covers income earned from September 1 through December 31 of the tax year. Many self employed people front load income recognition into Q4 (year end client billings, December bonuses), so the Q4 calculation often needs the most attention.
How do I figure out how much to send in?
The simplest method for most people is the safe harbor rule. Pay in at least one hundred percent of last year's total federal tax liability across the four quarters, or one hundred ten percent if your prior year adjusted gross income was over one hundred fifty thousand dollars. Meet that and the IRS does not charge an underpayment penalty, no matter what you actually owe at filing time.
If last year's total tax liability was eight thousand dollars, you can send two thousand dollars per quarter and the IRS is satisfied for the current year. You might still owe money at filing time if your income grew, but you will not owe a penalty.
The other method is to project your actual current year tax. This is more accurate but more work, and it only makes sense when your income has changed meaningfully or when you want to minimize the float you are giving the IRS. For most steady small business owners, the safe harbor method is cleaner.
Either way, you want the math done before the deadline, not on the deadline. Rushing a calculation the morning a payment is due is where most mistakes happen.
What happens if I miss a quarterly payment?
The IRS charges an underpayment penalty, calculated as interest on what you should have paid in, from the date it was due until the date it actually gets paid. The penalty rate has floated around seven to eight percent annually in recent years. It is not a flat fine. It is time based.
Because the penalty is time based, the best thing to do when you realize you missed a payment is just pay as soon as possible. A missed April 15 payment that gets made on May 1 costs very little. A missed April 15 payment that waits until filing time the next April costs real money.
If you missed a payment because cash was tight, pay what you can now and catch up on the next quarter. Partial payments stop the interest from accruing on the amount you did pay.
Does an S corporation owner still need to pay quarterly estimates?
Usually yes. S corporation distributions are not subject to withholding, and the reasonable salary portion of your compensation only covers the taxes on that salary. The distribution portion still needs quarterly estimates to cover the income tax on it, plus any self employment tax offsets that apply.
This is one of the most common compliance gaps I see with newer S corporation owners. They set up the S corporation to save self employment tax, then forget that the income still flows through to their personal return and still has to be paid in over the year.
If you are running an S corporation and you have not been making quarterly estimates, the underpayment penalty can stack up quickly. A conversation ahead of the next quarter will save you both the penalty and the surprise at filing time.
What is the easiest way to actually send the payment?
IRS Direct Pay at irs.gov is free, requires no account, and pulls directly from a checking or savings account. It is the cleanest option for most individuals. For larger or recurring payments, EFTPS is worth the enrollment. Avoid sending paper checks when you have a choice.
Direct Pay gives you an instant confirmation number. Save that number. It is the fastest way to resolve any confusion later if the IRS says a payment did not arrive.
State payments usually have a similar online portal at your state department of revenue. Some states will accept one combined payment, others want each quarter separately. Your state tax return from last year usually lists the correct portal and account type.
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What is quarterly tax?
Quarterly tax is the IRS shorthand for estimated income tax paid in four installments throughout the year. It applies to income that does not have taxes withheld automatically — self employment income, business profit, rental income, and meaningful investment gains. You are essentially prepaying your annual tax bill in four pieces instead of all at once.
Most people who get a W-2 paycheck never deal with quarterly tax because their employer already withholds and remits federal income tax with each pay period. Once you earn money that has no withholding attached, you become responsible for paying as you go. That is what quarterly tax actually is — your version of withholding, just on a quarterly cadence.
Why do you have to pay quarterly taxes?
Because the United States runs on a pay-as-you-earn tax system. The IRS expects you to pay tax in the same period you earn the income, not eighteen months later. When you do not have withholding, quarterly estimated payments are how you stay current. Skip them and the IRS charges an underpayment penalty calculated as interest on the missed amount.
There is also a real cash management reason. A self employed person who waits until April to pay an entire year of federal and state income tax plus self employment tax often does not have the money saved. Paying quarterly forces the discipline of setting aside roughly twenty five to thirty percent of business income as it comes in.
Do I have to pay quarterly taxes in my first year of business?
Often no — at least not in the strictest sense. The IRS safe harbor rules let you avoid the underpayment penalty if you paid in at least one hundred percent of your prior year tax liability through withholding or estimates. If your prior year tax was zero or very low, the safe harbor amount you owe in estimates is also zero or very low.
That said, waiting until April to pay an entire first year of business tax in one lump is brutal cash flow. Most new business owners are better off making quarterly estimates anyway, even if no penalty would apply, so they are not blindsided. The safe harbor protects you from penalties, not from owing the actual tax.
Do quarterly estimated taxes have to be equal amounts?
No. The default safe harbor assumes equal quarterly payments, but the IRS allows the annualized income installment method for taxpayers with uneven income. If your business made most of its income in Q3 and Q4, you can pay smaller estimates in Q1 and Q2 and larger ones later without triggering a penalty, as long as the math on Form 2210 works out.
This matters for seasonal businesses, real estate investors who close large deals late in the year, and contractors whose project income clusters. Equal payments are the simple path. Annualized installments are the path that matches reality. We use the latter when it fits a client's actual income shape.
Do I have to make estimated tax payments if I also have a W-2 job?
Sometimes. If your W-2 withholding alone covers at least one hundred percent of last year's total tax (one hundred ten percent if your prior year adjusted gross income was over one hundred fifty thousand dollars), you are inside the safe harbor and quarterly estimates are not required. If side income pushes total tax above that threshold, you either bump up W-2 withholding via a new Form W-4 or send quarterly estimates on the gap.
The W-4 withholding adjustment is usually the cleanest route because it spreads automatically through every paycheck. Quarterly estimates are the right call when the W-4 cannot absorb the increase, like when side income spikes mid year or W-2 income shrinks.
Do quarterly taxes have to be paid on time?
Yes. The four federal deadlines — April 15, June 15, September 15, and January 15 of the following year — are firm. The IRS calculates the underpayment penalty as interest on each missed installment from its due date forward. A payment made one day late accrues one day of interest. A payment made three months late accrues three months of interest at the current rate.
The good news is the penalty is not a flat fine. It is time based, so the moment you catch up, the bleeding stops. If you missed Q2 entirely, paying Q2 plus Q3 together on the Q3 deadline limits the damage to the period between the two dates rather than letting it run to filing.