LLC Quarterly Estimated Taxes Guide — 1040-ES Schedule, Safe Harbor & Penalty Avoidance (2026)

Before you start

What to know first

LLC owners who expect to owe $1,000 or more in federal income tax for the year must pay quarterly estimated taxes. This applies to sole-proprietor LLC owners (disregarded SMLLCs), partnership LLC members whose ordinary income is SE-taxable, and S-Corp owner-operators on their W-2 salary gap — i.e., income that is not already covered by employer withholding.
The IRS does not automatically withhold income or self-employment tax from LLC owner draws or distributions. You are responsible for proactively estimating, calculating, and remitting your own taxes on a quarterly schedule — or face an underpayment penalty even if you pay the full balance by April 15.
The federal quarterly estimated tax due dates are: April 15 (Q1 — January 1 through March 31), June 15 (Q2 — April 1 through May 31), September 15 (Q3 — June 1 through August 31), and January 15 of the following year (Q4 — September 1 through December 31). If a date falls on a weekend or federal holiday, it moves to the next business day.
The safe-harbor rules let you avoid the underpayment penalty entirely, even if you end up owing more at year-end: (1) Pay 100% of the prior year's federal tax liability in equal quarterly installments, or (2) Pay 110% of the prior year's liability if your prior-year adjusted gross income (AGI) exceeded $150,000 (married filing jointly or single). This threshold is $75,000 for married filing separately. The 110% rule is sometimes called the 'high-income safe harbor.'
An alternative safe-harbor method is to pay 90% of the current year's actual tax liability via timely quarterly payments. This method requires you to accurately estimate your current-year income — useful if your income is significantly lower than the prior year (e.g., you closed a contract, sold a business asset, or took a large deduction in the prior year that won't repeat).
The underpayment penalty is not a flat fee — it is an interest charge calculated at the IRS underpayment rate (currently the federal short-term rate + 3 percentage points, approximately 7–8% annualized as of 2026) applied to the shortfall for each day it is underpaid. The penalty is computed separately for each quarterly period — a Q1 underpayment that you fix in Q3 still accrues interest for Q1 and Q2.
For LLC owners with an S-Corp election, the owner's W-2 withholding (federal income tax withheld from payroll checks) counts toward estimated tax obligations. If your withholding is sufficient to cover safe-harbor, you owe no quarterly estimates on top of that. The most common scenario: S-Corp owners adjust their W-2 withholding to cover their estimated income tax, then take distributions without worrying about separate quarterly payments.
Most states impose their own quarterly estimated tax requirements, mirroring the federal schedule. Key exceptions and variations: California uses the same April 15 / June 15 / September 15 / January 15 federal schedule. New York uses March 15 / June 15 / September 15 / January 15 — Q1 falls on March 15, not April 15. Texas and Nevada have no personal income tax. Florida has no personal income tax on wages/self-employment income. Always verify your state's due dates with the state revenue agency.

Documents

What you'll need

Prior year Form 1040 — the most important input for the safe-harbor calculation; line 24 (total tax) is your baseline; the prior year's total tax × 100% (or × 110% if prior AGI > $150K) = your safe-harbor annual amount
Year-to-date P&L from your bookkeeping software — needed to estimate current-year income if using the 90%-of-current-year method; monthly P&L export from QuickBooks, Xero, Wave, or Bench
IRS Form 1040-ES (Estimated Tax for Individuals) — worksheet on pages 7–9 walks through the calculation; available free at irs.gov/forms-pubs/about-form-1040-es
State quarterly estimated tax form — varies by state (e.g., California Form 540-ES, New York Form IT-2105); check your state revenue agency's website
Quarterly payment confirmation receipts — save every IRS Direct Pay or EFTPS confirmation number; these are your proof of timely payment if the IRS issues an underpayment notice
Schedule SE (prior year) — shows your prior-year self-employment tax, which is a component of your total federal tax liability used in the safe-harbor calculation

Process

Step by step

Determine your safe-harbor target amount Pull your prior year Form 1040, Line 24 (Total Tax). This is your safe-harbor baseline. If your prior-year AGI (Line 11) was $150,000 or less, your safe-harbor target = prior-year total tax × 100%. If your prior-year AGI exceeded $150,000, your safe-harbor target = prior-year total tax × 110%. Divide the annual safe-harbor target by 4 to get your quarterly payment amount. Example: prior-year total tax = $12,000; AGI = $95,000 (under $150K); safe-harbor target = $12,000; quarterly payment = $3,000 per quarter, due April 15, June 15, September 15, January 15.
Estimate current-year income (optional — for the 90%-of-actual method) If your current-year income is significantly lower than last year, the prior-year safe-harbor method may overpay. Use the 90%-of-actual method instead: project your full-year net profit from your year-to-date P&L; calculate your expected SE tax (Schedule SE) + income tax (using current tax brackets); multiply total by 90%; divide by 4. This method requires accuracy — if you underestimate, you still owe the penalty. The prior-year safe-harbor (Step 1) is simpler and risk-free if your income is stable or growing.
Set up your quarterly payment calendar Calendar all four federal due dates: April 15 (Q1), June 15 (Q2), September 15 (Q3), January 15 (Q4). If you have state income tax, add state quarterly due dates — they vary by state. New York's Q1 deadline is March 15, not April 15. California uses the same federal schedule. Set a recurring calendar reminder 2 weeks before each due date so you have time to pull your YTD P&L and confirm your payment amount. If you miss a quarterly deadline, pay as soon as possible — the penalty accrues daily, so late is better than never.
Set up a tax reserve account Open a dedicated savings account or sub-account for your tax reserve. Mercury, Relay, Found, and Novo all support sub-accounts with no minimum balance. Transfer 25–35% of each month's net LLC profit to this reserve account as you earn it — do not wait until the quarterly due date. A common formula for disregarded SMLLC owners: set aside SE tax (14.13% of net profit after the SE deduction) + your marginal income tax rate % (typically 22%–24% for LLC owners in the $80K–$200K net profit range). At $10,000/month net profit, a 30% reserve = $3,000/month → $9,000 per quarter → more than enough to cover a $3,000 safe-harbor payment.
Make your quarterly payment via IRS Direct Pay Go to irs.gov/payments and select 'IRS Direct Pay.' Choose 'Estimated Tax' as the reason for payment and '1040-ES' as the tax form. Enter your SSN (not your LLC's EIN — estimated taxes are paid on your personal return), payment amount, and bank account. Select the tax year and payment date. Confirm and save the confirmation number. Estimated taxes for an SMLLC are paid on your personal SSN even if your LLC has an EIN — because the LLC is a disregarded entity and the tax obligation is yours personally. Multi-member LLC members also pay on their personal SSN. S-Corp payroll taxes are separate and use the LLC's EIN.
Reconcile at year-end and adjust next year's schedule When you file your annual return: compare actual tax liability to estimated payments made. If you over-paid, you get a refund or can apply the credit to next year's Q1 estimated payment. If you under-paid but met safe-harbor, you owe no penalty — just pay the balance by April 15. If you under-paid without meeting safe-harbor, complete IRS Form 2210 (Underpayment of Estimated Tax) to calculate the exact penalty. For next year: if your income has grown, update your safe-harbor baseline from your new prior-year return and recalculate. If you elected S-Corp in the current year, adjust your W-2 withholding rate so payroll withholding covers most of your income tax obligation.

Costs

What it costs

Item	Amount	Notes
IRS Direct Pay (free ACH — recommended)	$0	Pay directly from a bank account at irs.gov/payments. No account creation required for individual filers. Supports same-day, scheduled, and advance payments. Limit: $10M per payment. No fee whatsoever. This is the preferred method for most LLC owners.
EFTPS — Electronic Federal Tax Payment System	$0	Free ACH system at eftps.gov. Requires enrollment (3–5 business days to receive PIN by mail). Best for businesses or individuals who make frequent payments and want a permanent payment record. Required for payroll tax deposits if your LLC has employees. EFTPS is also the method payroll services (Gusto, OnPay) use to deposit employer and employee payroll taxes.
Credit or debit card payment	1.82%–1.98% convenience fee	The IRS does not accept cards directly — payments route through third-party processors (Pay1040, ACI Payments, payUSAtax). Each charges a convenience fee of approximately 1.82%–1.98% of the payment amount. On a $5,000 quarterly payment, the fee is roughly $91–$99. Only use if you need the points or float, or if you cannot make an ACH payment on time.
TurboTax Self-Employed — estimated tax calculator	$130–$170 (annual software)	TurboTax Self-Employed includes a quarterly estimated tax calculator that runs in-year projections based on your year-to-date income and deductions. It generates Form 1040-ES payment vouchers automatically. Affiliate: utm_source=biz-license&utm_medium=guide&utm_campaign=quarterly-taxes-turbo
H&R Block Self-Employed — estimated tax calculator	$85–$115 (annual software)	H&R Block Self-Employed includes quarterly estimate calculations integrated with Schedule C completion. Lower price point than TurboTax with similar functionality for sole-proprietor LLC owners. Affiliate: utm_source=biz-license&utm_medium=guide&utm_campaign=quarterly-taxes-hrblock
CPA — estimated tax modeling	$200–$500 (one-time) or included in annual prep	A CPA can model your first-year quarterly estimates based on your projected income, deductions, and prior-year liability. Particularly valuable for LLCs in their first year of operation (no prior-year baseline), S-Corp elections in the first year of payroll, and LLCs with highly variable or seasonal income. Most CPAs include quarterly estimate guidance in their annual tax prep engagement.

FAQ

Common questions

When are LLC quarterly estimated taxes due?

Federal quarterly estimated tax due dates are: April 15 (Q1 — covering January 1 through March 31), June 15 (Q2 — covering April 1 through May 31), September 15 (Q3 — covering June 1 through August 31), and January 15 of the following year (Q4 — covering September 1 through December 31). Note that Q2 covers only 2 months and Q4 covers 4 months — this is an IRS quirk, not an error. If any due date falls on a weekend or federal holiday, the deadline moves to the next business day. State estimated tax schedules are usually identical but verify with your state's revenue agency — New York's Q1 deadline is March 15, not April 15.

How do I calculate my quarterly estimated tax payment?

The simplest approach is the prior-year safe-harbor method: (1) Find Line 24 (Total Tax) on your prior year Form 1040. (2) If your prior-year AGI was $150,000 or less, your annual safe-harbor target equals that amount. If your AGI exceeded $150,000, multiply it by 110%. (3) Divide by 4 to get your quarterly payment. Example: prior-year total tax = $8,000, AGI = $75,000 → quarterly payment = $2,000. This method guarantees you owe no underpayment penalty regardless of what you actually earn this year. For a more precise approach, use Form 1040-ES worksheet to project current-year income, SE tax, and income tax — then pay 90% of that total in four installments.

What is the penalty for missing an LLC quarterly estimated tax payment?

The underpayment penalty is an interest charge (not a fixed dollar penalty) at the IRS underpayment rate — currently the federal short-term rate plus 3 points, approximately 7–8% per year. The penalty is calculated from the missed due date to April 15 of the following year on the shortfall amount. Example: you owe $3,000 Q2 (due June 15) but pay nothing. If the underpayment rate is 8%, the daily rate is 0.022%. On a $3,000 shortfall for 9 months (~275 days), the penalty is approximately $3,000 × 0.022% × 275 = $181.50. Not catastrophic — but it compounds quarterly, and missing all four payments at $3,000 each could result in $400–$700 in total penalties. Paying even a partial amount reduces the penalty proportionally.

Do I owe quarterly taxes if I had a loss this quarter?

If you are using the prior-year safe-harbor method, you must still make the quarterly payment even during a loss quarter — because the safe-harbor is based on last year's liability, not this year's performance. Your loss this quarter will reduce your full-year income and your final April 15 bill — you may get a large refund if you overpaid quarterly. If you are using the 90%-of-current-year method, a loss quarter reduces your projected annual income and therefore your estimated payment. You can legally pay $0 for a loss quarter under this method, but you must reforecast for subsequent quarters and ensure you hit 90% of actual for the full year — if your other quarters are profitable enough to create a tax liability, you must pay in those quarters.

Can I pay all my LLC taxes in one lump sum in April?

You can pay the full balance in April, but you cannot escape the underpayment penalty for the prior year's quarterly shortfalls. The underpayment penalty is not waived by paying in full by April 15 — it is charged for each quarter you were underpaid. However, if you meet safe-harbor (100% or 110% of prior year's tax via quarterly payments), you owe no penalty even if you still owe a balance in April — you just pay the remaining balance without a penalty on top. If you are in your first year of LLC operation (no prior-year LLC income), you have no safe-harbor baseline — in this case, the 90%-of-actual method is your only option, and quarterly payments are advisable.

Do I use my EIN or SSN to pay quarterly estimated taxes?

Use your Social Security Number (SSN), not your LLC's EIN, when making quarterly estimated tax payments via Form 1040-ES or IRS Direct Pay. Quarterly estimated taxes are paid on your personal Form 1040 — even for a single-member LLC, because the LLC is a disregarded entity and the tax obligation is entirely personal. Enter your own SSN in the taxpayer identification field on IRS Direct Pay, not your LLC's EIN. The LLC's EIN is used only for payroll tax deposits (Form 941), business bank accounts, and any S-Corp-related entity filings.

What is the New York State quarterly estimated tax schedule for LLCs?

New York's quarterly estimated tax schedule for individuals (including LLC owners reporting income on their personal NY return) differs from the federal schedule: Q1 is due March 15 (not April 15), Q2 is due June 15, Q3 is due September 15, and Q4 is due January 15. Use Form IT-2105 (Estimated Income Tax Payment Voucher for Individuals) for NY state estimated payments. NYC residents also owe NYC resident income tax, which follows the same NY quarterly schedule. New York City and NYC resident tax is handled via the same IT-2105 or through NYC's online payment system.

Provenance

Legal basis & official sources

Last verified 2026-05-07.

IRC §6654 (Failure by individual to pay estimated income tax — penalty provisions and safe-harbor rules). IRC §1401 (Self-employment tax — imposes SE tax on net earnings from self-employment). IRC §6654(d)(1)(B) (Safe-harbor rule — 100% of prior year tax, 110% if prior-year AGI > $150K). IRC §6654(d)(1)(A) (90%-of-current-year alternative safe harbor). IRS Publication 505 (Tax Withholding and Estimated Tax — primary reference for Form 1040-ES calculations). Rev. Proc. 2023-34 (2026 inflation adjustments for tax brackets and safe-harbor thresholds). State quarterly estimated tax requirements governed by individual state revenue statutes.

Direct filing portal: https://www.irs.gov/payments

If you skip this

Underpayment penalty — the IRS charges interest (~7–8% annualized) on any quarterly shortfall below safe-harbor, calculated daily from the missed due date through April 15 of the following year; paying the full balance by April 15 does not retroactively erase the quarterly penalty
Compounding state penalties — most states with income tax impose their own underpayment penalties on top of the federal penalty; California adds a 5% penalty plus interest; New York adds interest at the underpayment rate; combined federal + state penalties on a $5,000 shortfall can exceed $500
Cash-flow crisis at year-end — LLC owners who skip quarterly payments routinely face a large lump-sum tax bill in April; at 30% effective rate on $100K net profit, that is $30,000 due at once, with no installment option for current-year taxes
IRS notice cascade — if you miss multiple quarterly payments, the IRS may issue CP14 (balance-due notice) and CP501/CP503/CP504 escalating notices; these trigger a notice-resolution process that consumes time and attention even if the underlying amount is correct
S-Corp payroll compliance gap — S-Corp owner-operators who do not set their W-2 withholding rate high enough may fail to cover their estimated income tax via payroll, resulting in both a quarterly underpayment and an underpayment notice after filing Form 1120-S and their personal return

Official sources

§ A Related guides

§ B Building permits

§ C Companion tools

Disclaimer: Informational only, not legal or tax advice. Rules change, so confirm with a business attorney or CPA before you act.