Estimated Quarterly Taxes for eBay Sellers: Dates, Safe Harbors and How to Pay

When you work for an employer, tax comes out of every paycheck before you see it. When you sell on eBay for yourself, nothing does. The money lands in your bank account in full, and the tax bill for the year sits in the future until a person with a spreadsheet, or an IRS notice, reminds you. Estimated tax is the system that closes that gap: instead of paying one lump sum at filing time, you send the IRS your tax in installments during the year.

This guide is for US sellers and walks through who has to pay estimated tax, the 2026 due dates (including the one still ahead of you as this is published), the safe harbor rules that keep you out of penalty territory, how to work out an amount, and the ways to pay. It uses IRS pages checked in October 2026. It covers federal income tax and self-employment tax only; your state may have its own estimated tax rules, so check your state tax agency separately.

1. Why estimated tax exists

The IRS describes estimated tax as one of two pay-as-you-go methods, the other being withholding. In Publication 505 it says estimated tax is used to pay income tax and other taxes such as self-employment tax, and that people in business for themselves will generally have to pay this way. Estimated tax covers income that has no withholding, such as self-employment earnings, interest, dividends, rent and capital gains.

The IRS's page on sole proprietorships lists Form 1040-ES for estimated tax and Schedule SE for self-employment tax.

For an eBay seller, the relevant income is your business profit. The IRS's self-employment tax page describes net earnings as gross income from your trade or business minus ordinary and necessary business expenses. The profit, not the gross sales figure, is what the tax is worked out on. Our guide to eBay seller taxes in the US covers the 1099-K and the sales side, and how to price so you actually have a profit to tax is in how to price eBay listings for profit.

Worth remembering: estimated tax is a way of paying tax you already owe as you earn, not an extra tax. Whatever you pay in installments is credited against your final tax bill when you file.

2. Who has to pay

The IRS's estimated taxes page says individuals, including sole proprietors, partners and S corporation shareholders, generally must make estimated tax payments if they expect to owe $1,000 or more when they file their return, and corporations if they expect to owe $500 or more. It also says: "If you are in business for yourself, you generally need to make estimated tax payments."

Publication 505 (2026) adds a more precise test. You generally must pay if you expect to owe at least $1,000 for 2026 after subtracting withholding and refundable credits, and your withholding and credits will fall short of the smaller of:

• 90% of your 2026 tax; or
• 100% of your 2025 tax, provided the 2025 return covered a full 12 months.

If your 2025 adjusted gross income was more than $150,000 ($75,000 if you are married filing separately for 2026), the prior-year figure is 110% instead of 100%. The publication also says you do not need to pay estimated tax if you had no tax liability for 2025, were a US citizen or resident alien for the whole of 2025, and had a 12-month 2025 tax year. If you are a wage earner with a side business, the IRS notes you can avoid estimated payments by having your employer withhold more using a new Form W-4.

Notice what is not in the test: whether you received a Form 1099-K. Our 1099-K guide explains how eBay reports payments, but the estimated tax rule is triggered by what you expect to owe, not by what forms you receive.

3. The 2026 due dates

The year is split into four payment periods with four due dates. These are the dates in Publication 505 (2026):

The periods are not equal in length, which surprises many first-timers: the second period is only two months. Rules that go with these dates:

• Weekends and holidays. If a due date falls on a weekend or legal holiday, the next business day counts.
• The January shortcut. The publication says that if you file your 2026 return by January 31, 2027, and pay the whole balance due with it, you do not need to make the January 15, 2027 payment.
• Mailing. A mailed payment is dated by its US postmark, although the IRS notes Postal Service processing rules may affect the date.
• Paying early or unevenly. The IRS's estimated taxes page says you can pay weekly, biweekly or monthly, as long as enough has been paid by the end of each quarter.

As of this post's date, the first three 2026 installments have passed and the next due date is January 15, 2027. Dates for 2027 will be in the 2027 Form 1040-ES, so confirm them there rather than assuming the same calendar days apply.

4. The safe harbors: how to avoid the penalty

The IRS's page on the underpayment penalty (Topic 306) says that if you do not pay enough through withholding, estimated payments or both, you may owe a penalty, and that it is generally avoided if either of these applies:

• you owe less than $1,000 after subtracting withholding and refundable credits; or
• you paid at least 90% of the current year's tax, or 100% of the tax shown on the prior year's return, whichever is smaller.

Publication 505 adds the 110% rule for higher-income taxpayers above, and a two-thirds rule for farmers and fishers. The IRS also says the penalty is figured separately for each payment period, and that you can owe it even if you are due a refund. That last point matters: a big refund in April does not erase a penalty for having paid too late in the year.

Which safe harbor should you use?

The prior-year rule is attractive for a new or fast-growing seller because it is a known number. If your tax last year was low because you sold little, then paying 100% of that low figure keeps you penalty-free even if this year's tax is much higher. The trade-off is that you may then owe a large balance when you file. The 90% rule costs more up front but leaves less to pay in April. Neither is "better"; they answer different questions. One protects you from the penalty with certainty, the other protects your cash flow at filing time.

Two cautions. First, the prior-year rule only works if the prior year was a full 12-month year (the IRS states that condition). Second, if your 2025 income was above the $150,000 threshold, you must use the 110% figure. If you do not know your numbers yet, the Form 1040-ES worksheet and the IRS Tax Withholding Estimator, which the IRS points to on its Form 1040-ES page, help you work them out.

5. A worked example (illustrative)

The numbers below are made up to show the arithmetic. They are not a forecast, and your actual tax will depend on your whole return.

Step 1: estimate the business profit

Suppose a seller expects $18,000 of net profit from eBay in 2026 after costs (fees, product cost, shipping and other business expenses).

Step 2: estimate self-employment tax

The IRS says the self-employment tax rate consists of 12.4% for Social Security and 2.9% for Medicare, which adds up to 15.3%, and that the amount subject to the tax is generally 92.35% of net earnings. It also says that you can deduct one-half of the self-employment tax when figuring adjusted gross income.

• $18,000 x 92.35% = $16,623.
• $16,623 x 15.3% = $2,543.32 (rounded to the cent).
• Half of that is $1,271.66, the deduction when working out adjusted gross income.

The IRS Schedule SE instructions give the maximum self-employment income subject to Social Security tax as $176,100 for 2025 and it can change every year, so a profit this size is well below it, but check the current figure if yours is large.

Step 3: add income tax

Income tax depends on filing status, other income, deductions and credits, so no single number is right. Use the 1040-ES worksheet. For the illustration, suppose the worksheet gives income tax of $1,500 on this profit. That is an assumption, not a calculation.

Step 4: total and installments

Estimated total tax for the year: $2,543.32 + $1,500 = $4,043.32. If the seller has no withholding, the 90% safe harbor is 0.90 x $4,043.32 = $3,638.99 (rounded). The regular method divides the annual amount by four, which Publication 505 says works if income is roughly even: $4,043.32 / 4 = $1,010.83 per installment.

Step 5: compare with the prior-year rule

Suppose last year's full-year tax was $2,000. The prior-year safe harbor is 100% of $2,000, or $2,000 (the 110% rule applies only above the $150,000 income line). The smaller of $3,638.99 and $2,000 is $2,000, so paying $2,000 across the year would avoid the penalty under the IRS's wording, with about $2,043 still due when the return is filed. The seller must still pay that tax; the safe harbor is only about the penalty.

Seasonal sellers should note one more thing in the IRS's pages: if income arrives unevenly, the annualized income installment method may reduce the amount due for some periods, but Publication 505 says using it means you must file Form 2210 with your return. A seller who earns most of the profit in the fourth quarter is the typical case where the method can matter, but the form is more work, so you may prefer help from a tax professional or software.

6. How to pay

Publication 505 (2026) lists these ways to pay estimated tax:

• Your IRS online account. You can make estimated tax payments and see your payment history.
• IRS Direct Pay. A transfer from your checking or savings account at no cost. The IRS says you can change or cancel it within two days of the scheduled payment date.
• EFTPS. No fee, but you must be enrolled, and payments come from your checking or savings account.
• Debit card, credit card or digital wallet. Processed through approved providers, who charge a fee. Fees vary by provider, card type and amount.
• The IRS2Go app. Pay through the mobile app.
• Cash at an approved retail location. The IRS says not to mail cash.
• Check or money order. Each payment must include a Form 1040-ES payment voucher, mailed to the address in the Form 1040-ES instructions, not the Form 1040 instructions.

You can also apply an overpayment from last year's return to the first installment. The publication says that if you file on time, it counts as paid on April 15, 2026.

Joint payments, vouchers and nonresident filers

The IRS says that for joint estimated payments you enter the names and Social Security numbers on the voucher in the same order as they will appear on the joint return. Individuals generally use Form 1040-ES, while nonresident aliens use Form 1040-ES(NR). If you pay by mail, the IRS says to use the mailing address from the Form 1040-ES instructions, and notes that the 2026 form had a correction to its mailing addresses issued in February 2026, so make sure you are using the current version of the form from IRS.gov rather than an old printout.

Keeping records

Keep a record of each payment: date, amount, method and the confirmation you receive. When you file, you report them on your return, and you will need the figures to complete Form 2210 if you use the annualized method. A simple table with the four due dates and the amount paid against each is enough.

7. Reconciling eBay's numbers with your profit

eBay's 1099-K page says the form shows gross payments, the number of transactions and your name, address and tax ID, and that the gross amount is before adjustments such as fees, refunds and credits. In other words, the form is not your profit. To estimate tax you need to rebuild profit from your own records. A workable routine before each due date:

1. Download your eBay sales and fee reports for the period.
2. Add your product cost, shipping, packaging and other business costs for the same period.
3. Subtract to get net profit for the period, and add it to the year-to-date total.
4. Rerun the worksheet with the year-to-date profit, projecting the rest of the year honestly.
5. Compare the result with what you have already paid and with the safe harbor figure, then pay the difference due for that period.

The IRS says you may also pay weekly, biweekly or monthly as long as enough is paid by the end of each quarter, so a seller whose payouts arrive every week can send a small amount each time instead of one large payment.

8. If you get it wrong

The IRS says you may owe a penalty if you do not pay enough, and that Form 2210 is used to figure whether you owe it. The IRS can generally figure the penalty for you. It may waive the penalty if a missed payment was caused by a casualty, disaster or other unusual circumstance and imposing it would be inequitable, or if you retired after age 62 or became disabled during the year or the prior year and the underpayment was due to reasonable cause and not willful neglect. The Form 2210 instructions on IRS.gov explain how the amount is figured, so check them rather than assuming a rate.

If you realize in October that you should have been paying since April, the IRS says the penalty is figured separately for each period, so earlier shortfalls may still count. Send what you owe toward the next installment and set the schedule up in January for next year.

9. A practical system for eBay sellers

The tax rules are simple compared with the cash discipline. These habits help, and none of them depends on a particular software or bank:

1. Open a separate business account. The bank account your eBay payouts land in should be your business one, so profits and personal spending are not mixed. Our EIN guide and Managed Payments payout guide cover that side.
2. Move a share of every payout to a tax pot. Choose the share from your own worksheet, not from a generic percentage, and revisit it each quarter.
3. Track profit, not just revenue. A profit figure needs cost of goods, eBay fees, shipping and refunds. If your records are only sales totals, you will overpay your tax pot or underpay it.
4. Update the estimate after each period. The worksheet is only as good as your latest numbers.
5. Schedule the payment. Direct Pay lets you schedule, and change or cancel within two days of the date, so you can set it ahead of the deadline.
6. Keep the paper trail. Save eBay fee statements, supplier invoices, postage receipts and refund records so your profit figure can be rebuilt from documents.

If you sell items you sourced from suppliers, remember that sales tax is a different matter: see resale certificates and seller's permits and business licenses by state. Pricing carefully also helps: the US eBay fee calculator shows what a sale leaves, and Sellhelm, the eBay dropshipping software this blog belongs to, prices every listing from your real fees.

10. Common mistakes

1. Ignoring self-employment tax. Publication 505 says estimated tax covers other taxes such as self-employment tax. A plan that only counts income tax will be short.
2. Using gross sales as profit. The IRS defines net earnings after ordinary and necessary business expenses.
3. Assuming a refund cancels the penalty. The IRS says you can owe the penalty even if you are due a refund.
4. Using the 100% prior-year rule above the income line. If last year's adjusted gross income was over $150,000, the figure is 110%.
5. Assuming the prior-year rule works after a short year. The 2025 return must cover 12 months.
6. Mailing a payment without a voucher or to the wrong address. Use the 1040-ES voucher and the address in its instructions.
7. Missing the January 15 date. You can skip it only if you file by January 31, 2027, and pay the balance in full.
8. Paying by card without checking fees. The IRS says approved providers charge a fee.
9. Forgetting state tax. This guide covers federal tax only. Check your state tax agency.

This guide is general information, not tax advice. If your income is irregular, you have a spouse with income, or you also have employee wages, a tax professional can build the estimate for your actual return.

Sources and how we checked

Facts in this guide were checked against these official pages in October 2026. Rules and figures change, so confirm anything that affects a decision. This is general information, not legal or tax advice.

• Estimated taxes (IRS)
• Publication 505, Tax Withholding and Estimated Tax (IRS)
• Topic no. 306, Penalty for underpayment of estimated tax (IRS)
• About Form 1040-ES (IRS)
• Direct Pay (IRS)
• Topic no. 554, Self-employment tax (IRS)
• Sole proprietorships (IRS)
• Instructions for Schedule SE (IRS)
• eBay Form 1099-K (eBay)

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