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A common mistake with gig and marketplace income is simple. Someone gets a Form 1099-K for $42,000, looks at the bank account, sees $33,000 actually came in, and reports $33,000. The return looks reasonable. It is also a mismatch waiting for the IRS computer to find it.
The fix is not to report less. The fix is to report the gross and then show your work. Here is how.
Start with what the form measures
Form 1099-K is issued under IRC Section 6050W, which requires the payment settlement entity to report the gross amount of reportable payment transactions. The IRS states that the box 1a gross amount is not adjusted for fees, credits, refunds, shipping, cash equivalents, or discounts.
In other words, the form shows what customers paid through the platform, before the platform took anything out. Your bank account shows what was left after the platform took its cut. Both numbers are true. They measure different things.
If you need the background on who sends these forms and the current $20,000 and 200 transaction threshold for apps, start with our Form 1099-K overview.
How the IRS checks your return
The IRS Automated Underreporter program matches information returns to tax returns. IRM 4.19.3.8.7.1 tells the examiner to compare Form 1099-K amounts with Schedule C, Schedule E, and Schedule F, and to consider the 1099-K reported if it is included in a larger total on Schedule C or F, unless it is obviously not the same type of income.
Read that rule twice. It tells you the goal. Your Schedule C gross receipts for the business should be equal to or larger than the 1099-K total for that business. If they are smaller, the computer sees a gap and the gap becomes a notice.
The reconciliation, line by line
Schedule C has a structure that handles this cleanly. The 2025 Schedule C instructions say to enter gross receipts from your trade or business on line 1, to report sales returns and allowances as a positive number on line 2, and to enter total commissions and fees on line 10. Here is a worked example for a seller who uses one online marketplace.
| Item | Amount | Where it goes |
|---|---|---|
| Form 1099-K, box 1a | $42,000 | Included in Schedule C, line 1 |
| Cash and direct sales not on any form | $3,000 | Also included in line 1 |
| Gross receipts reported | $45,000 | Schedule C, line 1 |
| Customer refunds issued | $1,800 | Schedule C, line 2 |
| Platform selling and payment fees | $5,900 | Schedule C expense, such as line 10 |
| Shipping paid | $1,300 | Schedule C expense |
The 1099-K's $42,000 sits inside the $45,000 on line 1, so the match is satisfied. The refunds and fees still reduce your profit. You pay tax on what you actually made, and the IRS sees the number it expected.
Report the gross, deduct the costs, keep the receipts. That order is the whole game.
Where people go wrong
Netting fees before line 1
If you put the bank deposits on line 1 instead of the gross, you have already taken the fees out. That understates line 1 relative to the form and invites a mismatch. Worse, people then deduct the fees again on line 10, which double counts the deduction. Pick one approach: gross on line 1, fees as an expense.
Double counting income
Some platforms send both a 1099-K and a 1099-NEC to the same worker. The two forms may cover different payment streams, or a mistake may cause the same dollars to show up twice. Do not simply add every form together without looking. Pull the platform's annual summary, see what each form covers, and make sure each dollar of income appears once on line 1.
If a platform really did report the same dollars twice, the fix starts with the company. The IRS says to contact the filer and ask for a corrected form. See what to do about a wrong or missing 1099.
Mixing personal and business payments
If you use the same payment app account for business and personal transactions, a 1099-K can sweep in money that is not business income, like a friend paying you back for dinner. Since tax year 2024, Schedule 1 (Form 1040) has an entry space above Part I for Form 1099-K amounts received in error or for personal items sold at a loss. IRM 4.19.3.8.7.1 lists that space as a place examiners check. If you used that space, keep records showing why each amount is not income. The personal item rules are covered in selling personal items on a 1099-K.
The better long-term answer is separate accounts. Business money in one, personal money in the other. It makes this reconciliation take ten minutes instead of a weekend.
Ignoring income without a form
The reconciliation is not just about the 1099-K. Line 1 should include every dollar of business income, including cash, checks, and app payments that fell below the reporting threshold. The 2025 Schedule C instructions put it directly: report all income attributable to your trade or business from all sources. More in income without a 1099.
Build a one-page reconciliation worksheet
Before you file, make a simple worksheet and keep it with your tax records. It should show:
- Every 1099-K and 1099-NEC for the business, by payer, with the gross amount.
- Income received without a form, by source.
- The total, which should equal Schedule C line 1.
- Refunds and allowances, tied to platform reports, which equal line 2.
- Platform fees, shipping, and other costs, tied to platform reports and receipts.
- A tie-out from net platform payouts to bank deposits.
IRC Section 6001 and Treas. Reg. 1.6001-1(a) require you to keep records sufficient to establish the amount of gross income and deductions on your return. This worksheet, with the platform's annual statements behind it, is exactly that record.
What if you already filed with the wrong number?
If you reported net deposits on line 1 and the 1099-K was larger, you may get a proposed adjustment that treats the difference as unreported income, with no credit for the fees you already netted out. Do not just agree to it. Respond with the reconciliation showing that the gross was reported net of fees, and that the fees are legitimate business expenses. If you have not received a notice yet, consider whether an amended return makes sense to correct the presentation.
The underlying profit usually was not wrong. The presentation was. Presentation problems are fixable when you have the platform reports and a clean worksheet. They get expensive when you do not.
If you drive or deliver, your reconciliation also needs to handle mileage, tolls, and tips. Our rideshare driver guide covers those pieces.
Frequently asked questions
Should Schedule C line 1 match my 1099-K exactly?
Not necessarily. Line 1 should include all gross receipts from the business, which means it will usually be equal to or larger than your 1099-K total. Under IRM 4.19.3.8.7.1, IRS examiners consider 1099-K income reported if it is included in a larger total on Schedule C. A line 1 smaller than your 1099-Ks is what draws attention.
Where do platform fees go on Schedule C?
Platform fees are a business expense, not a reduction of gross receipts. The 2025 Schedule C instructions put total commissions and fees on line 10, and refunds to customers go on line 2 as returns and allowances. Keep the platform annual summary that shows the fees, because that is your proof if the IRS asks.
What if I got a 1099-K and a 1099-NEC for the same income?
Compare each form to the platform annual summary. If they cover different payments, report both. If the same dollars were reported twice, contact the company that issued the form and ask for a corrected one. Report each dollar of income once, and keep your correspondence and worksheet.
Can I fix a mismatch after I get an IRS notice?
Often, yes. If you reported net deposits instead of gross receipts, you can respond with a reconciliation showing the 1099-K gross, the fees and refunds deducted, and the platform reports that support them. Respond by the deadline on the notice, and do not agree to an adjustment that ignores legitimate expenses.
This guide is general information about federal tax law, not legal advice for your situation. Reading it does not create an attorney-client relationship.