Q2 Estimated Tax Payments: What Business Owners Need to Know Before June

If you’re running a small business, June has a way of sneaking up on you. Between managing clients, paying vendors, and keeping operations moving, it’s easy to miss a tax deadline that doesn’t come with the same fanfare as April 15th. But Q2 estimated tax payments are due on June 16, 2026, and missing them can cost you real money in penalties and interest.

I’ve spent the last six years helping small business owners navigate exactly these kinds of moments. Here’s what you need to know before the deadline hits.

Why Estimated Taxes Exist (And Why They Matter to You)

When you work for an employer, they withhold taxes from every paycheck and send them to the IRS on your behalf. As a business owner (whether you’re a sole proprietor, LLC, S-corp, or partnership), no one does that for you. The IRS expects you to pay your taxes as you earn income throughout the year, in four quarterly installments.

According to the IRS, if you don’t pay enough tax by the due date of each payment period, you may be charged a penalty even if you’re due a refund when you file your annual return.^¹ That penalty is currently calculated at the federal short-term interest rate plus 3%, which doesn’t sound massive until you realize it compounds daily and applies to every quarter you were short.

Who Needs to Pay Q2 Estimated Taxes?

You generally need to make estimated tax payments if you expect to owe $1,000 or more in federal taxes after subtracting withholding and credits. For most small business owners, that threshold is crossed quickly.

This includes:

•       Sole proprietors and single-member LLCs filing on Schedule C

•       Partners in a partnership

•       S-corporation shareholders who receive pass-through income

•       Self-employed individuals and independent contractors

As Kiplinger notes, the U.S. tax system is pay-as-you-go, meaning the IRS expects tax to be paid as income is earned — either through withholding or quarterly estimated payments.^² If your business had a strong Q1 or you’ve landed new clients this spring, don’t assume your situation from last year still applies. Income changes fast, and your estimated payments should reflect your current trajectory.

How to Calculate What You Owe

There are two IRS-approved methods for calculating your quarterly payment:

1. The Safe Harbor Method

Pay at least 100% of what you owed in taxes last year (or 110% if your prior year adjusted gross income exceeded $150,000). To avoid penalties, you pay the lesser of 90% of your current year tax liability or 100% of your prior year tax liability (110% if your prior year AGI exceeded $150,000).^³ This method protects you from underpayment penalties even if your actual tax liability turns out to be higher. It’s simple and predictable, which is why many of the business owners I work with at Paisley Business Services prefer it, especially during periods of rapid growth.

2. The Annualized Income Method

Calculate your actual income through the end of the quarter, project it forward, and pay based on your estimated actual liability. This method requires more work but can reduce your payments if business is slower than last year.

For most small business owners wearing every hat in the company, the safe harbor method is a practical starting point. But if your income has shifted significantly, up or down, it’s worth running both calculations to see which makes more sense for your cash flow.

What the Q2 Payment Actually Covers

A common misconception: Q2 estimated taxes don’t cover just April and May. For federal purposes, the “second quarter” runs from April 1 through May 31, with payment due June 16th. Note that the deadline is June 16th rather than the 15th because June 15 falls on a Sunday this year.^¹ State deadlines may differ; some states have their own quarterly schedule, and a few don’t require estimated payments at all. Always verify your state’s requirements separately.

Making Your Payment

The IRS makes this part straightforward. The easiest method is IRS Direct Pay at irs.gov, which lets you pay directly from a bank account at no cost. You can also pay via the Electronic Federal Tax Payment System (EFTPS), by credit or debit card (though a processing fee applies), or by mailing a check with Form 1040-ES.

Whatever method you choose, keep a record. Payment confirmations aren’t just good practice; they’re your proof of compliance if questions come up later.

Don’t Overlook Self-Employment Tax

Business owners often focus on income tax and forget that self-employment tax (which covers Social Security and Medicare) is also included in your estimated payments. The combined self-employment tax rate is 15.3%, covering both the employer and employee portions of Social Security and Medicare that a traditional W-2 employee would split with their employer.^³ It adds up quickly and is one of the most common reasons business owners underpay throughout the year.

The good news: you can deduct half of your self-employment tax when calculating your adjusted gross income, which partially offsets the burden. But you need to account for it upfront, not discover it at filing.

Getting Ahead Instead of Just Keeping Up

Estimated tax deadlines are one of the clearest opportunities business owners have to move from reactive to proactive financial management. When you know what’s coming, you can set aside money each month, avoid cash flow surprises, and make smarter decisions about expenses and timing.

At Paisley Business Services, this kind of forward-looking financial awareness is central to how we support small business owners. Whether it’s helping you calculate a safe harbor amount, reviewing your Q1 actuals to project the rest of the year, or simply building a tax calendar that keeps you ahead of deadlines, these are the conversations that protect your business and reduce your stress.

The last few years of working alongside business owners has taught me one consistent lesson: the deadlines that cause the most financial pain are usually the ones that felt like they could wait just a little longer. June 16th doesn’t have to be one of them.

Quick Review: Q2 Estimated Tax Checklist

•       Deadline: June 16, 2026 (federal)

•       Who owes: Anyone expecting $1,000+ in federal tax liability

•       Calculate using: Safe harbor (100%/110% of prior year) or annualized income

•       Don’t forget: Self-employment tax is part of your estimated liability

•       How to pay: IRS Direct Pay, EFTPS, card, or check with Form 1040-ES

•       State taxes: Check your state’s deadline separately; it may differ

Joshua Doney is the founder of Paisley Business Services, where he has spent six years helping small business owners navigate the financial and operational challenges of building and growing a business. Have questions about your estimated tax situation? Reach out to Paisley Business Services to talk through your numbers before the deadline.

Sources

1. IRS. “When to Pay Estimated Tax.” IRS.gov. https://www.irs.gov/faqs/estimated-tax/individuals/individuals-2

2. Taylor, Kelley R. “Estimated Tax Payment Deadlines 2026: Quarterly Due Dates and How to Avoid IRS Penalties.” Kiplinger, April 10, 2026. https://www.kiplinger.com/taxes/tax-deadline/602538/when-estimated-tax-payments-due