No 1099, Still Taxable: Reporting Cash, App Payments and Small Jobs Nobody Reported

"They never sent me a 1099, so I didn't think I had to report it."

That sentence has cost a lot of self-employed people a lot of money. It sounds reasonable. It is not how the tax law works. The form is a reporting duty for the person who paid you. Your duty to report income exists whether they did their job or not.

The rule in one sentence

IRC Section 61 defines gross income as all income from whatever source derived, and lists compensation for services and gross income derived from business among its examples. Treas. Reg. 1.61-1(a) adds that income can be realized in any form, whether in money, property, or services.

Notice what is missing from that definition: any mention of a form. A 1099 is evidence. It is not the trigger.

Common income that arrives without a form

Jobs under the reporting threshold

For nonemployee compensation, a business payer generally had to file a Form 1099-NEC once it paid you $600 in 2025. For payments made after December 31, 2025, that threshold is $2,000, and it will be adjusted for inflation starting in 2027 under IRC 6041(h). A client who paid you $1,800 in 2026 owes you no form. You still owe tax on the $1,800. The details are in the 1099-NEC threshold change.

App payments below the 1099-K line

Payment apps and online marketplaces report on Form 1099-K only when your payments for the year exceed $20,000 and the transactions exceed 200, under IRC 6050W(e). Plenty of gig workers fall below that. The IRS says it directly: whether or not you receive a Form 1099-K, you must still report your income. See our 1099-K guide.

Payments from individuals

Section 6041(a) applies to persons engaged in a trade or business making payments in the course of that business. A homeowner who pays you to paint a bedroom is usually not paying you in the course of a business, so you may never get a form. That income still goes on your Schedule C.

Cash and checks

Cash is income. Checks are income. Tips handed to you in person are income. None of them comes with paperwork unless you create it.

Payments in property, trade or digital assets

If a client pays you with a laptop, a month of free rent, or services of their own, that is income measured by its fair market value, because Treas. Reg. 1.61-1(a) includes income realized in property or services. The Internal Revenue Manual instructions for underreporter cases, in IRM 4.19.3, state that digital assets received as payment for goods or services in a trade or business are generally ordinary income and generally subject to self-employment tax.

Clients outside the United States

Foreign clients often have no U.S. information reporting obligation at all. If you live in the U.S. and do the work, the income is still part of your gross income.

A missing form is not a missing tax. It is a missing piece of evidence, and the IRS can find others.

How the IRS finds income that had no form

The matching program catches income with a form. Income without a form gets caught a different way: in an examination.

IRM 4.10.4 lays out how examiners test whether reported income is complete. For individual business returns, the minimum income probes include a financial status analysis, an initial interview, reconciling books and records to the return, testing gross receipts, and a bank account analysis. If those steps turn up unexplained bank deposits or income that does not reconcile, the manual calls for a more in-depth examination of income, which can include formal indirect methods like the bank deposits and cash expenditures method.

The theory behind that method, as the IRM describes it, is simple. If you receive money, only two things can happen to it. You deposit it or you spend it. An examiner who adds up both and compares the total to your reported income will find most of what you left out. The full process is in how a bank deposits analysis works.

The longer exposure window

Unreported income also changes how long the IRS has to come after you. The general rule in IRC 6501(a) gives the IRS three years after you file to assess additional tax. But under IRC 6501(e)(1)(A), if you omit from gross income an amount that is more than 25% of the gross income stated on your return, the IRS gets six years. And under IRC 6501(c)(3), if no return is filed at all, there is no time limit.

So leaving off a few thousand dollars of side income is not just a matter of a little more tax. If the omission is big enough relative to what you did report, it can double the window during which that year stays open.

How to capture all of it

You do not need fancy software. You need a habit.

1. Use one business account. Run every business payment, cash included, through a single account you use only for the business. Deposit cash instead of spending it out of your pocket.
2. Keep an income log. Date, payer, amount, method, and what the job was. A spreadsheet works.
3. Issue your own invoices or receipts. For cash jobs especially, a numbered receipt book or invoice log is strong evidence of what you earned, and what you did not.
4. Value non-cash payments. Write down what you received and its fair market value on the date you received it.
5. Reconcile before filing. Total your deposits, back out transfers, loans, gifts, and other non-income items with documentation, and make sure Schedule C gross receipts cover the rest.

The 2025 Schedule C instructions say to report all income attributable to your trade or business from all sources. That is your target. The 1099s you receive are a cross-check, not the total. For the mechanics of matching forms to your return, see reconciling a 1099-K on Schedule C.

What if you already left income off?

If you filed and left income off, you have options, and the earlier you act the better they look. An amended return reporting the additional income, with the tax paid or arranged, usually puts you in a far better position than waiting for an examiner to find the gap.

If the omission spans several years, involves significant amounts, or you are worried about how it will be viewed, talk to a tax attorney before you file anything. The right sequence matters, and so does what you say. You may also want to review the recordkeeping rules for the self-employed so next year is cleaner.

And remember the other half of the bill. Unreported self-employment income usually means unpaid self-employment tax too, at 15.3% on top of income tax. Our walkthrough of how self-employment tax is calculated shows what that looks like.