Taxes

How to pay quarterly taxes: A step-by-step guide for self-employed sellers

Published October 25, 2026 12 min read

Estimated payments help you pay federal tax during the year rather than waiting until you file. A useful routine starts with profit, then adjusts as your sales and other income change.

• Check whether your expected tax bill will be covered by withholding and credits.
• Estimate tax from business profit, not gross sales, and account for self-employment tax.
• Use the Form 1040-ES schedule for the correct installment dates.
• Choose an IRS payment method, confirm each payment, and keep its record.
• Revisit your estimate when income changes, especially if sales are uneven.

Check whether you need to pay estimated taxes

You generally need to pay estimated taxes if you expect to owe at least $1,000 in federal tax after withholding and refundable credits for tax year 2026, subject to the IRS rules and exceptions. The IRS explains the test and exceptions on its estimated tax page. The question is not simply whether you received a tax form; it is whether enough tax will be paid during the year.

Compare your expected tax bill with withholding and credits

Estimate your total federal tax for the year, then subtract what you expect to pay through paycheck withholding and eligible credits. If the remaining amount may reach the IRS threshold for tax year 2026, review the Form 1040-ES worksheet to see whether estimated payments are required. Your calculation should include income from all sources, not just your resale activity.

A marketplace tax form reports payments, not your final taxable profit. For a quick refresher on taxable income and how the IRS treats different kinds of sales, see reseller tax basics. That context can help keep a gross payment total from being mistaken for the amount on which tax is ultimately figured.

Include self-employment income and other taxable income

If you resell as a business, include expected net profit along with wages, interest, and other taxable income when you estimate your federal bill. Self-employment income can bring both income tax and self-employment tax into the calculation. A 1099-K reconciliation guide can help you work from gross payments toward the sales and costs that belong in your records.

Your estimate is only as useful as the figures behind it. Keep refunds, fees, postage, and the cost of items sold distinct from gross receipts, then include any other income that affects your return.

Consider whether increased paycheck withholding could cover the difference

If you or your spouse also receives wages, changing withholding may be an alternative to making separate estimated payments. You can review your expected withholding against your tax estimate and ask your employer about submitting an updated Form W-4. Whether this works depends on your circumstances and the amount of tax still due.

This can be simpler than managing two payment routines, but do not assume that a larger paycheck deduction automatically covers everything. Compare the revised withholding with the full-year estimate and revisit it if your income changes.

Estimate how much to pay

Estimate each payment from your expected federal tax for the year, less withholding and credits already expected. Form 1040-ES provides a worksheet for working through income, deductions, taxes, and installment amounts. For a reseller, the first useful figure is business profit, not the total buyers paid.

Start with expected business profit, not gross sales

Begin with the sales and other receipts you expect, then account for refunds, the cost of goods sold, and deductible business expenses when arriving at expected profit. Unsold inventory is not the same as the cost of items already sold, so keep purchases and sales records clear. A Schedule C estimate is a more useful starting point than treating a platform's gross payment figure as income to tax.

The Schedule C guide explains where common reseller amounts fit on the form. If you want to work from your own numbers, the self-employment tax calculator estimates Schedule C net profit, Schedule SE tax, and a federal tax set-aside. It is an estimate, not a tax return.

Account for income tax and self-employment tax

Your payment estimate may need to cover both federal income tax and self-employment tax. The latter generally applies to business earnings from self-employment and helps cover Social Security and Medicare taxes. Other income, deductions, and your filing situation can affect the final income-tax calculation, so avoid treating one flat percentage as a precise answer.

Keep the two tax components visible in your working estimate. The calculator's result is a starting point to review, while your complete tax picture may include income and withholding beyond your reseller activity.

Use Form 1040-ES to estimate payments and check the safe-harbor rules

Use the worksheet in Form 1040-ES for tax year 2026 to estimate your expected tax and required installments. It also explains the safe-harbor rules, which can help determine whether your payments are sufficient to avoid an underpayment penalty. Check the form for the rules that apply to your income and prior-year tax rather than relying on a rough set-aside alone.

For a second way to organize the calculation, you can run a reseller tax estimate using your selling figures. Compare its estimate with the worksheet and make sure your inputs reflect profit and relevant non-business income, not gross sales alone.

Mark the installment deadlines

Mark all four federal estimated-tax installment dates for the tax year, because missing a date can matter even if you expect to settle the full bill when you file. The schedule appears in Form 1040-ES for tax year 2026. Put the dates on your calendar early and leave time for a payment to clear.

Know why estimated tax payments are not always three months apart

The installments follow specified income periods, so their due dates are not always spaced exactly three months apart. That uneven spacing is one reason a simple “every quarter” reminder can mislead you. Use the official schedule for the tax year instead of assuming that each payment is due at the same interval.

If you sell seasonally, the dates may also arrive before your busiest period has ended. Keep the schedule visible while you plan cash flow, then revise your estimate when you have a clearer picture of your income.

Check the Form 1040-ES schedule for the tax year

For tax year 2026, the federal installment dates are April 15, June 15, and September 15, 2026, followed by January 15, 2027, as listed in Form 1040-ES. The following table puts the dates in one place so you can add them to your calendar.

Use the tax-year schedule to match each payment to the correct installment. If the IRS revises a date or issues relief, check the current IRS information before submitting payment.

Allow for weekends, holidays, and state payment deadlines

A federal due date can shift when it falls on a weekend or legal holiday, and the IRS may announce special relief in some circumstances. Check the current IRS schedule rather than relying on an old calendar or a reminder copied from a previous year. State estimated-tax rules are separate, so consult your state tax agency if you need to make state payments.

The 2026 estimated-tax guide also covers the installment schedule and underpayment considerations for resellers. It can be a useful companion, but the IRS schedule remains the authority for federal dates.

Choose a payment method

Choose an IRS payment method that lets you select an estimated tax payment and the correct tax year. The IRS offers online payment options, and the available methods and terms can vary. Before entering payment details, make sure you are on an official IRS page.

Pay online through an IRS payment service

You can use an IRS online payment service to make an individual estimated-tax payment from a bank account. The IRS payment options page describes available methods, including bank-account payments and other options. Read the service's instructions carefully, since not every method accepts every type of payment.

An online payment can be convenient when you want a confirmation number and a clear record of the transaction. Keep a copy of the confirmation after you submit, and check that the payment is scheduled for the date you intended.

Use EFTPS or another available payment option

The Electronic Federal Tax Payment System, or EFTPS, is another way to make federal tax payments. You can also review the IRS's other listed payment methods and choose one that accepts estimated-tax payments. If enrollment or setup is required, allow enough time before the due date.

The IRS explains who must pay estimated taxes and how estimated payments fit into paying tax during the year. Choose the option that matches your situation, and avoid sending a payment through a service unless you have confirmed that it is appropriate for this payment type.

Select the right tax year and estimated tax payment type

Payment services ask you to identify what you are paying. Select estimated tax rather than a balance due or another payment category, and choose the tax year the installment belongs to. A payment assigned to the wrong year or type may not be credited as you intended.

Before you continue, compare the selected year and payment type with your Form 1040-ES schedule. Keep the payment confirmation with your estimate so you can later verify what you sent and where it was applied.

Submit each payment and save the records

Submit each installment only after checking its amount, payment date, tax year, and payment type. Your records should show both the estimate you used and what the IRS received. A consistent record makes it easier to reconcile payments when you prepare your annual return.

Confirm the amount and payment date before submitting

Compare the amount you are about to pay with your current worksheet, then check the date and payment details on the IRS service. If your estimate has changed since you last reviewed it, update the calculation before submitting rather than copying an old amount automatically.

A short pre-payment review can catch common mix-ups:

• Confirm that the amount matches your current estimate.
• Check the payment date and tax year.
• Select estimated tax as the payment type.
• Save the confirmation after submission.

These checks do not replace the IRS worksheet, but they help make sure the payment you send matches the one you meant to make. If a detail is wrong before submission, correct it before proceeding.

Keep the confirmation with your tax records

Save the confirmation number or receipt with your tax records as soon as the payment is submitted. Keep it alongside the estimate and the records supporting your income and expenses, so you can trace the path from business activity to payment. The IRS also provides recordkeeping guidance for deciding what records to retain.

A folder organized by tax year can keep payment confirmations from getting mixed with marketplace statements or receipts. If the IRS account later shows a different payment history than you expected, your confirmation gives you a useful reference when you investigate.

Track payments against your running estimate

After each payment, subtract it from your running estimate and note the date and amount. This lets you see what has already been paid and what may remain, rather than rebuilding the history near filing time. Keep withholding and estimated payments separate in your notes so the two are not confused.

Review the total after each installment and compare it with the updated estimate. If your income has moved significantly, the next payment may need a different amount; do not assume that repeating the previous installment will still fit.

Update your estimate as your income changes

Update your estimate when sales, costs, or other income change enough to affect the amount you expect to owe. A calculation made early in the year is a working forecast, not a promise that each installment should stay fixed. Revisiting it can help you respond to a stronger or slower selling period.

Recalculate after a strong or slow sales period

After a busy stretch, update your expected receipts, refunds, inventory costs, and expenses, then revise your projected profit. Do the same after a slow period if your earlier estimate assumed sales that did not happen. The goal is to base the next decision on current figures rather than an outdated forecast.

For estimating reseller profit and self-employment tax, the 2026 reseller tax calculator can run your figures through its stated calculation. Treat the result as an estimate and check it against your own records and the applicable IRS forms.

Consider uneven income when planning installments

Sales do not always arrive evenly across the year. If your income is seasonal or changes sharply, the annualized income installment method in Form 1040-ES may be relevant to your calculation. Read the form instructions carefully, because the method has specific requirements and can affect how much is due at different installments.

Keep dated sales and expense records as income arrives. That history helps you distinguish a temporary jump from a sustained change and gives you better information for updating the estimate.

Review whether a catch-up payment or adjusted withholding may help

If a revised estimate shows that earlier payments may be short, review the Form 1040-ES instructions to see whether a catch-up payment or a change in paycheck withholding makes sense. The right approach depends on your payment history, income timing, and overall tax situation. Avoid assuming that a later payment automatically erases any earlier underpayment issue.

Before acting, compare what has already been paid with the safe-harbor rules and the remaining due dates. If the calculations are difficult or your circumstances are unusual, ask a tax professional to review them.

Conclusion

Paying estimated taxes is a repeatable process: estimate profit and the rest of your federal tax picture, follow the current Form 1040-ES schedule, and save each confirmation. As your numbers change, update the estimate rather than relying on the first forecast; when you are ready to work through your figures, try the reseller calculator.

Keep reading

• Net profit vs gross profit: formulas, differences, and when each matters

  Gross profit and net profit answer different questions: one focuses on direct costs, while the other reflects a wider set of expenses.

• Form 1040-ES: How to calculate and pay estimated taxes for 2026

  Form 1040-ES helps you estimate and pay federal tax during the year rather than waiting until you file your annual return.