Reconcile marketplace tax statements with your records and bank

Three numbers that never seem to agree

In January, a reseller who sells on two marketplaces opens three things: a Form 1099-K from one platform, an annual sales report from the other, and a bank statement showing what actually arrived. None of the totals match. That's normal. Each number measures something different: what buyers paid, what the platform kept, what was refunded, and what finally landed in the bank. Reconciliation is the job of explaining the gaps so the income you report rests on your records, not on whichever number looks smallest.

This guide covers reconciling marketplace tax statements with your own records, using the IRS pages on understanding and using Form 1099-K and IRS guidance on recording business transactions, checked November 8, 2026. It explains the arithmetic of matching reports. It isn't tax advice and doesn't cover how to file.

Why the numbers differ

The IRS says payment apps and online marketplaces must send Form 1099-K to you and to the IRS, by January 31, when required. Its "what to do" page says the gross payment amount in Box 1a isn't adjusted for fees, credits, refunds, shipping, cash equivalents or discounts, and that you can deduct those items from the gross amount using your records. So the 1099-K is a starting point that's intentionally bigger than what you kept.

The IRS also says you may get a Form 1099-K even if your payments are below the reporting threshold, and that you must report all income whether or not you receive one.

Step 1: Gather one year of each source

For each platform, download:

• The Form 1099-K, if issued.
• The platform's annual sales or tax report.
• Monthly payout reports or a payout history.

From your own records, export the year's sales, refunds, fees and labels by platform. From your bank, pull the year's deposits from each platform.

Step 2: Check the form's details

The IRS page says to check that the payee taxpayer identification number and the gross payment amount are correct. If either is wrong, it says to request a corrected form from the issuer named as "Filer" on the form, keep copies and correspondence, and not to wait for a correction to file. It also says the IRS can't correct a 1099-K for you.

Step 3: Rebuild the gross amount from your records

Total what buyers paid on that platform in your records, including shipping charged to buyers. Compare it with the 1099-K gross. Small timing differences at year end, such as an order paid on December 31 and recorded in January, are common. Note them.

Step 4: Walk from gross to bank

Work down from the gross figure, one item at a time, until you reach the deposits.

Worked example: one platform, one year

In this chosen example, all amounts are illustrative.

When expected payouts equal deposits, every gap between the 1099-K and the bank is explained. Item costs, supplies and mileage don't appear here because the platform never saw them; they come from your own records. The calculator below shows the simpler two-step version: receipts, minus costs the platform withheld, minus costs you paid separately.

Step 5: Investigate anything that doesn't fit

If the walk doesn't land on the bank total, check for:

• Payouts in transit at year end.
• Refunds issued in a different month from the sale.
• Fee credits from returns.
• Reserve holds or balance adjustments.
• Personal payments in a payment app that aren't business income.

The IRS page says that if you receive a 1099-K that includes personal payments from family or friends, a duplicate, or payments that aren't yours, contact the issuer for a corrected form and keep records of the request.

Step 6: Write a one-page summary per platform

For each platform, write the gross, each adjustment, the expected payouts, the deposits, and any differences with a sentence explaining them. Keep it with the year's records. Your tax professional will thank you, and next year's reconciliation will take half the time.

Two platforms, two forms: The IRS notes that if you accept payments on different platforms, you could get more than one Form 1099-K. Reconcile each separately before adding them together.

Do it monthly to make January easy

A short monthly check, comparing each platform's payout report with bank deposits, catches problems while they're fresh. The inventory spreadsheet guide has the columns that make the annual walk simple, and the refund records guide covers recording refunds so they can be subtracted.

Common mistakes

• Treating the 1099-K gross as profit.
• Treating bank deposits as total sales.
• Ignoring year-end timing differences.
• Mixing personal payment-app transfers into business income.
• Waiting for a corrected 1099-K before preparing anything.

Explain every gap once

Reconciliation means walking from the platform's gross figure to the money in your bank, one labeled line at a time. Gather each source, rebuild the gross from your records, explain every difference, and keep a one-page summary for each platform.