There is a version of you that already knows the number. It surfaces at 2 a.m., or in the shower, or in the half-second after a client's payment lands and the joy curdles into some of this isn't mine. You could sit down and calculate what you owe the IRS this quarter. The math is not hard — it's six lines, and you'll see all six in a minute. But you haven't done it, and if you're honest, it's not because you're busy. It's because part of you would rather not know.

Economists have a name for this. When researchers Niklas Karlsson, George Loewenstein, and Duane Seppi studied how often investors logged in to check their portfolios, they found something telling: people checked constantly when markets rose and went quiet when markets fell. Same accounts, same money, same one-click access. What changed was whether the news was likely to hurt. They called it the ostrich effect — the tendency to avoid information we expect to be painful, even when knowing it would help us.

Freelancers do this with taxes at industrial scale. And the cruel joke is that the avoided number keeps compounding in the dark — as penalty interest, as spent money that was never yours, as a low-grade dread that colors every invoice — while the actual number, the one you'd get from twenty minutes of arithmetic, is usually smaller than the one your anxiety has been quoting you.

What Form 1040-ES is actually asking

The IRS's official tool for this is the worksheet inside Form 1040-ES, and it looks like it was designed to be avoided: dense lines, cross-references, no narrative. But strip away the formatting and it's asking one question in six steps: based on what you expect to earn this year, what will your total tax be — and have you paid a quarter of it yet?

Here are the six lines, in plain language:

  1. Estimate your net profit for the year. Not revenue — profit. Take what you've earned so far, subtract business expenses, and project it forward. If you're halfway through the year, doubling your year-to-date profit is a legitimate starting estimate.
  2. Compute self-employment tax. Multiply net profit by 92.35%, then multiply that by 15.3%. This is your Social Security and Medicare bill — the tax that exists whether or not you owe a dime of income tax.
  3. Take your deductions off the top. You get to deduct half of that self-employment tax, plus the standard deduction (around $15,000 for a single filer; the exact figure adjusts annually), plus — for most freelancers — the QBI deduction, worth roughly 20% of your qualified business income.
  4. Apply the income tax brackets to whatever's left. That's your income tax.
  5. Add lines 2 and 4 together. That's your total projected tax for the year.
  6. Subtract anything already withheld or paid, and divide what remains by the number of payment deadlines left. That's your quarterly payment.

That's the whole machine. Everything else in the worksheet is edge cases.

A worked example: $60,000 of profit

Abstract formulas don't defeat dread; concrete numbers do. So walk through it with a single freelancer who expects $60,000 of net profit this year, takes the standard deduction, and has no other income. (Illustrative brackets and figures — yours will differ, but the shape won't.)

Self-employment tax: $60,000 × 92.35% = $55,410. Multiply by 15.3% and you get about $8,478.

Deductions: Half the SE tax ($4,239), plus a standard deduction of about $15,000, plus a QBI deduction of roughly 20% of qualified income — call it $11,150. Total deductions: about $30,400.

Taxable income: $60,000 − $30,400 ≈ $29,600. At this level, the money falls entirely in the 10% and 12% brackets, producing income tax of roughly $3,300.

Total projected tax: $8,478 + $3,300 ≈ $11,800 for the year — about $2,950 per quarter.

Notice what just happened. The effective rate on this freelancer's profit is under 20% — not the 35% or 40% that the 2 a.m. catastrophizing suggests. This is the pattern for a huge share of freelancers: self-employment tax is the dominant cost at moderate incomes, the deductions are more generous than people assume, and the real number sits well below the imagined one. The ostrich wasn't just avoiding pain. It was avoiding relief.

When you can't predict the year: the safe harbor fallback

The honest objection: "I can't estimate my annual profit — my income is chaos." The IRS anticipated you. If your quarterly payments add up to 100% of last year's total tax (110% if your adjusted gross income was over $150,000), you owe no underpayment penalty no matter what this year brings. Last year's total tax is a single line on your filed Form 1040. Divide it by four. That's a floor you can stand on while the year sorts itself out — you'll settle any true-up in April, penalty-free.

So the calculation never actually requires clairvoyance. It requires either a reasonable guess about this year or a photocopy of last year. You always have at least one of those.

The number hurts less than the fog around it

Here's the deeper reason to do this today, beyond penalties. Research on information avoidance — Golman, Hagmann, and Loewenstein surveyed the field in the Journal of Economic Literature — finds that people dodge medical tests, account balances, and bad news generally, even when the information is free and useful. But the same literature points at the exit: avoidance thrives on ambiguity. A vague threat can be any size, so your mind quietly assigns it the worst one. A calculated number, even an unpleasant one, has edges. You can divide it by twelve. You can automate a transfer against it. You can be done thinking about it, which the fog never permits.

Every freelancer who finally runs this math reports some version of the same sensation: not joy, exactly, but the specific lightness of a dread that has been converted into a line item.

Your next moves

  • Pull your year-to-date net profit today. Bank statements or your invoicing tool, minus expenses. If you're partway through the year, scale it up proportionally to a full-year estimate. Don't perfect it — a rough number beats no number by a mile.
  • Run the six lines on paper. Profit × 92.35% × 15.3% for SE tax; subtract half of that plus the standard deduction plus ~20% QBI; apply the brackets to the remainder; add the two taxes together; divide by the deadlines left this year.
  • Find your safe harbor floor. Open last year's Form 1040, find your total tax, divide by four. If this year is unpredictable, paying that amount each quarter makes you penalty-proof.
  • Move the money now, not at the deadline. Transfer this quarter's amount — or start a weekly auto-transfer toward it — into a separate account so the payment is a formality, not a scramble.
  • Put the next IRS deadline on your calendar with a one-week warning. The quarterly due dates are not evenly spaced, and the calendar is where good intentions go to die.

Let the math run without you

The six-line calculation is genuinely doable by hand — that was the point of this article. But it's also the kind of math that needs redoing every time a big invoice lands or a slow month changes your trajectory, and that's exactly the recurring chore the ostrich effect feeds on. Payday exists to keep the number lit up so you never have to work up the nerve to face it: connect your Stripe or bank account, and it continuously recalculates your Q1–Q4 estimated payments from your real income, nudges you before each deadline, and hands you a TurboTax-ready file when the year closes. The freelancers who sleep well aren't the ones who owe less. They're the ones who always know the number.