There is a version of becoming self-employed that nobody warns you about. You leave the job. You start the business. The clients come. The revenue grows. Life feels like it is finally moving in the right direction.
And then the tax bill arrives. Not from one paycheck. Not from any employer. Just you, your income, and a system most people discover the hard way. Usually at the end of their first year, staring at a number that feels impossible.
Quarterly estimated taxes seem like a detail until they are not. Right now, with the June 15th deadline for Q2 approaching, you still have time to plan. Let me walk through how this works, what you owe, and how to reduce that number before the deadline hits.
Why the IRS Expects Payments Four Times a Year
The U.S. tax system runs on a pay-as-you-go principle. The rule, under 26 U.S.C. § 6654, is simple. Tax obligations must be satisfied throughout the year as income is earned. Not in one lump sum every April.
For employees, this happens automatically. The employer withholds a portion of every paycheck and sends it to the IRS. The employee never sees it. By year-end, the math is mostly done.
For everyone else, the responsibility shifts to you. Freelancers, consultants, independent contractors, and business owners have no employer doing that work. The IRS expects four installment payments instead: one in April, one in June, one in September, and one in January.
Miss those payments, or underpay them, and you face an underpayment penalty when you file. The penalty is not catastrophic. It runs at the federal short-term rate plus three percentage points. But it is completely avoidable.
Who Actually Owes Quarterly Estimated Taxes
The general rule: if you expect to owe at least $1,000 in federal income tax for 2026, and your withholding covers less than 90% of your current year bill, you likely owe quarterly payments.
That covers a wide range of people. Freelancers and independent contractors are the obvious group. So are sole proprietors, single-member LLC owners, and partners who take draws instead of salaries. S-Corp shareholders sometimes still owe estimated payments on pass-through income above their salary. Landlords, investors with capital gains, and retirees taking unwithheld distributions also fall into this category.
If you have not yet made your Q1 payment, which was due April 15th, 2026, address that shortfall now. Do not let it sit.
What the Q2 Deadline Actually Covers
This is where people get confused. The quarterly periods do not divide the year into four equal parts.
The Q2 payment, due June 15th, 2026, covers income earned from April 1 through May 31. The IRS uses Form 1040-ES to calculate these payments. That form includes a worksheet to project your annual income, apply deductions, and estimate your total tax liability.
Two months before June 15th is a generous runway. Most self-employed people do not think about their tax obligation until it is on top of them. Use this window to sit down with your actual January through April numbers. A real picture beats a guess every time.
Two Ways to Calculate What You Owe
There are two accepted methods. The right one depends on your situation.
Method One: The Safe Harbor
Under IRC § 6654(d), you avoid any underpayment penalty by paying 100% of your prior year’s total tax liability across the four quarters. If your 2025 federal income tax was $20,000, paying $5,000 per quarter satisfies the safe harbor. That is true regardless of what you earn in 2026.
If your prior year AGI exceeded $150,000, the threshold rises to 110%. A $20,000 prior year bill would then require $22,000 in payments, or $5,500 per quarter.
The advantage is certainty. You know the number. The penalty is off the table. The downside is that it does not account for growth. If your business earns significantly more this year, the safe harbor covers the penalty but leaves a lump sum due next April.
Method Two: Actual Income Projection
This method means estimating your current year liability based on what you have actually earned so far. It requires more work. But it produces a more accurate payment and prevents surprises at year-end.
You take your year-to-date income, project the rest of the year, apply your expected deductions, and estimate net profit. Then you factor in self-employment tax and allocate the total across the remaining quarters.
Most clients I work with use a combination of both. The safe harbor sets the floor. Projecting actual income tells you whether you are close to that floor or heading well past it.
The Self-Employment Tax Nobody Sees Coming
This is the part that catches almost every first-time self-employed person off guard. I want to spend a moment on it because it changes the math significantly.
When you are an employee, your employer pays half of your Social Security and Medicare taxes. You pay the other half through withholding. The combined rate is 15.3%: 12.4% for Social Security up to the 2026 wage base of $176,100, and 2.9% for Medicare with no cap. As an employee, you see 7.65% on your stub. The other 7.65% is invisible.
You Pay Both Sides Now
When you are self-employed, you are both the employee and the employer. That means you pay the full 15.3% under IRC § 1401. On $100,000 of net self-employment income, that is roughly $14,130 in SE tax before federal income tax even enters the picture.
The saving grace: you can deduct half of that SE tax as an above-the-line deduction under IRC § 164(f). It reduces your adjusted gross income and softens the hit on your income tax. It is not a full offset, but it helps.
The key takeaway: your estimated payment covers both income tax and self-employment tax. Many people calculate their income tax correctly and still underpay. They forgot about SE tax. If you have been thinking of your payment as just a percentage of your income, the number is almost certainly too low.
How to Actually Make the Payment
The IRS’s preferred method is the Electronic Federal Tax Payment System, known as EFTPS. Access it at eftps.gov. Enrollment is straightforward. Once set up, you can schedule payments ahead of time, view your history, and confirm submissions.
I prefer EFTPS over mailing a paper check. It creates a clean record and removes any uncertainty. Nobody wants the “lost in the mail” conversation with the IRS.
Other Payment Options
You can also pay at IRS Direct Pay using a bank account. No pre-enrollment needed. Credit card payments are accepted through authorized processors, but a processing fee applies. For routine estimated payments, I generally advise against it.
One more note: if your state has an income tax, most states also require quarterly estimated payments. Florida has no personal income tax, which keeps things simpler for my clients in Weston. But if you do business in other states, check their requirements separately.
Retirement Contributions: The Cleanest Way to Lower Your Bill
Here is the strategy I want every self-employed reader to understand before June 15th. Contributing to a retirement account reduces your taxable income right now. That directly lowers your estimated tax obligation this quarter and every quarter that follows.
The SEP-IRA Option
The SEP-IRA is one of the most powerful tools available to self-employed individuals. For 2026, you can contribute up to 25% of your net self-employment income, with a maximum of $70,000. Contributions reduce your Schedule C net income. That also lowers the base on which self-employment tax is calculated. The savings hit at two levels at once. I covered this in full in my piece on the SEP-IRA Playbook.
The Solo 401(k) Option
The Solo 401(k) allows both employee and employer contributions. Employee contributions go up to $23,500 in 2026, with a $7,500 catch-up for those 50 and older. The employer side adds up to 25% of compensation. The combined maximum is $70,000, or $77,500 with the catch-up.
For someone earning $200,000 in net self-employment income, the Solo 401(k) can produce a much larger deduction than a SEP-IRA alone. The tradeoff is that it requires a plan document and more structure. My piece on the Solo 401(k) tax strategy covers exactly when it makes more sense.
The Math Is Direct
If your Q2 payment feels large, increasing retirement contributions is the most legitimate way to reduce it. Every dollar contributed to a deductible retirement account lowers your taxable income by one dollar. That reduces your estimated payment by your marginal tax rate times that dollar.
If you are in the 24% federal bracket and contribute $10,000 more to your SEP-IRA, your federal income tax drops by $2,400. Your self-employment tax also dips because the contribution reduces your net SE income. The retirement account grows tax-deferred. That is not a workaround. That is Congress’s design working in your favor.
The Estimated Tax Mistake That Costs People the Most
The most common mistake I see is treating all four payments as equal fractions of the annual total.
Someone calculates they expect to owe $24,000 for the year. They divide by four and pay $6,000 each quarter. That feels right. It is not always. The IRS’s annualized income installment method, available on Form 2210, calculates penalty exposure by quarter. If your income is front-loaded and you underpaid in Q1, you may owe a partial penalty for that quarter. That is true even if your annual total is correct.
When Timing Matters Most
For most small business owners with consistent income, this is not a major concern. But for people with irregular income, the timing of payments matters a lot. A large contract in Q1, a slow Q3, and a spike in Q4 changes the calculation entirely.
Paying based on actual quarterly income, rather than an equal annual split, tends to produce better outcomes for this group. A short mid-year conversation with someone who knows your income pattern can easily be worth far more than the time it takes. If you are curious what that kind of review looks like in practice, it is exactly the kind of work I described in the April 20th piece on what to do after Tax Day.
Putting It All Together Before June 15th
You have roughly 65 days to make your Q2 payment. That is enough time to do this properly.
Pull your January through April income and expense numbers. Project the rest of Q2 realistically. Calculate your SE tax and income tax at your expected rate. Decide whether to increase retirement contributions before the payment date. Then submit through EFTPS with a clear record of what you paid and why.
The business owners who handle this correctly share one trait. They treat estimated taxes as a system they operate, not a bill that arrives, know their quarterly number before the deadline, make adjustments on retirement contributions, income timing, and deductible expenses, rather than just reacting.
If 2025 taught you something about the self-employment tax system you did not know before, 2026 is the year to use that knowledge.
Paying estimated taxes is not complicated. Paying the right amount, in a way that is legal, strategic, and actually efficient, that is where the real work is. And that work starts now, not in June.
Because the business owners who consistently build wealth are rarely the ones earning the most. They are the ones who know exactly where every dollar is going before it gets there.
Welcome to the New Age of Accounting. Let’s begin.
P.S. If you found this article helpful, you’ll love my new book S-Corp Mastery: How Smart Business Owners Maximize Tax Savings & Build a Lasting Legacy. It’s now live and available in a sleek, easy-to-read PDF version. Grab your copy here
Chris is the Managing Partner at Weston Tax Associates, a best-selling author, and a renowned tax strategist. With over 20 years of expertise in tax and corporate finance, he simplifies complex tax concepts into actionable strategies that drive business growth. Originally from Sweden, he now lives in Florida with his wife and two sons.
