If you sell on Amazon as a sole proprietor, single-member LLC owner, partner or S corporation shareholder, and you expect to owe $1,000 or more in federal tax when you file, the IRS generally expects you to pay during the year in four estimated tax installments. Self-employment income has no employer withholding, which is why the IRS calls estimated tax the method for paying it. For tax year 2026 the installments fall on April 15, June 15 and September 15, 2026, and January 15, 2027 (IRS Form 1040-ES, data checked 2026-10-11).
Amazon seller estimated taxes are not a separate tax. They are prepayments of the income tax and self-employment tax you will report on your return, and the penalty for underpaying is avoidable through a set of safe harbors. This guide covers who has to pay, what the payments cover, how your Amazon payouts flow into Schedule C and Schedule SE, the safe harbors, the 2026 dates, and how to pay. Federal rules only; state estimated tax is out of scope.
Do Amazon Sellers Have to Pay Estimated Tax?
The IRS frames the test in two parts. Under the General Rule in the 2026 Form 1040-ES instructions, you must pay estimated tax for 2026 in most cases if both of these apply:
- “You expect to owe at least $1,000 in tax for 2026, after subtracting your withholding and refundable credits.”
- You expect your withholding and refundable credits to be less than the smaller of “90% of the tax to be shown on your 2026 tax return” or “100% of the tax shown on your 2025 tax return.”
The IRS Estimated Taxes page names sole proprietors, partners and S corporation shareholders as people who generally must pay when they expect to owe $1,000 or more (page updated 25 September 2026, checked 2026-10-11). A one-member LLC taxed by default sits in the sole proprietor bucket; the LLC guide covers that classification.
There is one clean exception. You do not have to pay estimated tax for 2026 if you were a U.S. citizen or resident alien for all of 2025 and had no tax liability for the full 12-month 2025 tax year. Per Form 1040-ES, you had no liability “if your total tax was zero or you didn’t have to file an income tax return.” A seller who meets that test does not have to make 2026 estimated payments, although any 2026 tax is still due at filing.
Whether a Form 1099-K arrives changes none of this. The form is an information return; the 1099-K guide explains why its absence does not mean the income is untaxed.
What the Payments Cover: Income Tax Plus Self-Employment Tax
The IRS describes estimated tax as the method for paying tax on income that is not subject to withholding, naming “earnings from self-employment, including gig economy work” as the first example (Form 1040-ES, 2026). The Estimated Taxes page adds that the payments cover not only income tax but also self-employment tax and alternative minimum tax.
For most profitable sellers, self-employment tax is the part that surprises them, because it applies from a low profit level: the $400 trigger below. The facts, all checked 2026-10-11:
| Item | IRS figure | Source |
|---|---|---|
| Self-employment tax rate | 15.3% (12.4% Social Security + 2.9% Medicare) | Self-Employment Tax page |
| Filing trigger | Net earnings from self-employment of $400 or more | Self-Employment Tax page |
| Share of net profit that is taxed | 92.35% | 2026 Form 1040-ES SE worksheet |
| 2026 Social Security wage base | $184,500 of combined wages and net SE earnings | 2026 Form 1040-ES |
| Medicare portion | No wage base cap; an additional 0.9% Medicare tax applies above filing-status thresholds | Self-Employment Tax page |
| Deduction | 50% of SE tax, taken on Schedule 1 (Form 1040), line 15 | 2026 Form 1040-ES SE worksheet |
The worksheet instruction is explicit: when estimating 2026 net earnings, “be sure to use only 92.35% (0.9235) of your total net profit from self-employment.” The 12.4% Social Security portion stops at the $184,500 wage base, which is shared with any W-2 wages you also earn; the 2.9% Medicare portion does not stop.
From Amazon Payouts to Schedule C and Schedule SE
Your estimate is only as good as your profit number, and an Amazon payout is not profit. A disbursement is what is left after Amazon has deducted its fees and refunds, and it says nothing about inventory you paid for out of pocket. The chain the IRS uses runs like this:
- Gross receipts and expenses go on Schedule C. The IRS Self-Employed Individuals Tax Center describes Schedule C as the form for reporting income or loss from a business you operated as a sole proprietor (page updated 27 September 2026, checked 2026-10-11). The NAICS code guide covers the business code line.
- Schedule C line 31 is the starting number. The 2026 Form 1040-ES footnote points to Schedule C line 31 as where your net profit from self-employment is found.
- Schedule SE turns that profit into self-employment tax. The Tax Center says Schedule SE is how you report Social Security and Medicare taxes.
- Both taxes then feed the Form 1040-ES worksheet, which splits the annual required payment into installments.
This is why the monthly close matters more than the payout report. A reconciled profit and loss, built the way the FBA bookkeeping guide lays out, gives you a year-to-date Schedule C figure at each due date. If you keep books in software, the accounting software comparison covers the options; this page does not pick one. And the name, taxpayer ID and classification you give Amazon in the tax information interview should match the return those payments are credited to.
The Safe Harbors: How Much Is Enough to Avoid the Penalty
The underpayment penalty, per Form 1040-ES, “is imposed on each underpayment for the number of days it remains unpaid.” It applies if you did not pay enough for the year or did not pay on time in the required amount. The safe harbors set what “enough” means:
| Safe harbor | What it requires | Who it fits |
|---|---|---|
| Under $1,000 | You owe less than $1,000 after withholding and credits | Small or break-even stores |
| 90% of current year | Pay at least 90% of the tax on your 2026 return | Sellers whose profit is falling or predictable |
| 100% of prior year | Pay 100% of the tax shown on your 2025 return (a full 12-month return) | Growing stores; the number is known in advance |
| 110% of prior year | Replaces the 100% figure if your 2025 AGI was over $150,000 ($75,000 if married filing separately for 2026) | Higher-income sellers |
| 66⅔% for farming and fishing | Replaces 90% if at least two-thirds of gross income is from farming or fishing | Not typical for Amazon sellers |
Source: 2026 Form 1040-ES General Rule and Special Rules (checked 2026-10-11). The Estimated Taxes page states the same 90% and 100% tests and adds that you pay the smaller of the two.
The prior-year harbors are the practical ones for a growing store, because last year’s tax is a fixed number on a filed return while this year’s is a forecast. Form 1040-ES makes the trade-off plain: “Even if you pay the required annual payment, you may still owe tax when you file your return.” The harbor removes the penalty, not the balance.
2026 Estimated Tax Due Dates
| Installment | Due date (calendar-year filers) |
|---|---|
| 1st payment | April 15, 2026 |
| 2nd payment | June 15, 2026 |
| 3rd payment | September 15, 2026 |
| 4th payment | January 15, 2027 |
Source: 2026 Form 1040-ES, Payment Due Dates (checked 2026-10-11).
Three details from the same section:
- The periods are not equal quarters: the second installment comes two months after the first, the fourth four months after the third.
- “You don’t have to make the payment due January 15, 2027, if you file your 2026 tax return by February 1, 2027, and pay the entire balance due with your return.”
- If a due date falls on a Saturday, Sunday or legal holiday, the next business day counts.
How to Pay Estimated Tax
The 2026 Form 1040-ES and the Estimated Taxes page list these routes (checked 2026-10-11):
- IRS Online Account at IRS.gov/Account, which also shows your payment history.
- IRS Direct Pay, transfers from a checking or savings account “at no cost to you.”
- Debit card, credit card or digital wallet, where “A fee is charged by these service providers.”
- EFTPS, which requires enrollment.
- Phone and the IRS mobile app.
- Check or money order with the Form 1040-ES voucher, payable to “United States Treasury.”
You can also make more than four payments. Form 1040-ES allows it, provided the total paid within each period meets that period’s required amount.
Seasonal Sellers: The Annualized Income Method
Equal installments assume income arrives evenly, and many Amazon stores earn a large share of the year in the fourth quarter. Form 1040-ES addresses this directly: if you receive income unevenly, “for example, because you operate your business on a seasonal basis,” you may be able to lower or eliminate the required payment for one or more periods by using the annualized income installment method in chapter 2 of Publication 505.
Two conditions come with it. If you use the method, you file Form 2210, including Schedule AI, with your return even if no penalty is owed. And the method only helps when income is genuinely back-loaded; a store that earned steadily all year gains nothing from it. The Estimated Taxes page also points sellers with uneven income to Form 2210 to reduce or remove the penalty.
Common Mistakes
- Estimating from deposits. Payouts are net of Amazon fees but gross of inventory cost, so they overstate or understate profit depending on how much stock you bought.
- Forgetting self-employment tax. Budgeting only for income tax leaves the 15.3% tax on 92.35% of profit unfunded.
- Using the 100% harbor above the AGI line. Above $150,000 of 2025 AGI ($75,000 married filing separately), the prior-year harbor is 110%.
- Paying the full year in January. A single payment on January 15 does not cover the earlier installments; the penalty runs per underpayment, per day.
- Treating the harbor as the bill. Meeting it stops the penalty; any remaining tax is still due at filing.
Checklist
- Confirm you are not covered by the no-liability-last-year exception.
- Close the books for the period and read year-to-date Schedule C net profit.
- Estimate self-employment tax on 92.35% of that profit.
- Pull total tax from your 2025 return and check 2025 AGI against $150,000.
- Choose the harbor you are paying toward: 90% current, 100% prior, or 110% prior.
- Pay by the installment date through Direct Pay, your Online Account or EFTPS, and save the confirmation.
- If Q4 dominates your sales, read chapter 2 of Publication 505 before the first installment.
Frequently Asked Questions
Do I have to pay quarterly taxes on Amazon sales if I made under $1,000?
The $1,000 test is about tax owed, not sales. Per the 2026 Form 1040-ES, you generally must pay estimated tax if you expect to owe at least $1,000 after withholding and refundable credits. Separately, net self-employment earnings of $400 or more trigger a filing requirement.
Does a Form 1099-K change my estimated tax?
No. The 1099-K reports payments; your estimate rests on Schedule C profit and the tax on it, whether or not a form arrives.
Can I raise my W-2 withholding instead of paying estimated tax?
Form 1040-ES says that if you also receive wages, you may be able to avoid estimated payments by asking your employer to withhold more on a new Form W-4.
What if I missed a payment?
Pay as soon as possible. The penalty is figured per underpayment for the days it stays unpaid, so a late payment still shortens the period. The Form 2210 instructions describe conditions under which the penalty may be waived.
Bottom Line
For Amazon sellers, estimated tax comes down to three numbers: Schedule C profit, the self-employment tax on it, and the safe harbor you are paying toward. Keep the books current enough to read those numbers on each due date, and the quarterly payment becomes a routine transfer.
Sources, all checked 2026-10-11: IRS Form 1040-ES (2026), Estimated Taxes, Self-Employment Tax, Self-Employed Individuals Tax Center. General information only, not tax advice.