Yes, the IRS will very likely know if you didn't report income from a 1099 form. Payers send a copy of every 1099 to the IRS, and an automated system matches this against your tax return. If the income is missing, the IRS will likely send a notice, such as a CP2000, requesting a response and recalculating your tax, potentially adding penalties and interest.
The IRS knows about any income that gets reported on a 1099, even if you forgot to include it on your tax return. This is because a business that sends you a Form 1099 also reports the information to the IRS. The IRS cross-references tax returns with other income records that businesses submitted.
The IRS can catch a missing 1099 form as they receive copies from payers. If you forget to report it, you risk penalties and interest on unpaid taxes. To avoid this, report all income, even if you don't receive a 1099. If you discover a missing form after filing, submit an amended return using Form 1040-X.
Not reporting all of your income is an easy-to-avoid red flag that can lead to an audit. Taking excessive business tax deductions and mixing business and personal expenses can lead to an audit. The IRS mostly audits tax returns of those earning more than $200,000 and corporations with more than $10 million in assets.
Businesses that show losses are more likely to be audited, especially if the losses are recurring. The IRS might suspect that you must be making more money than you're reporting. Otherwise, why would you stay in business? Most likely to be audited are taxpayers reporting small business losses.
No, the IRS doesn't catch every instance of unreported income, but their advanced data-matching systems catch most discrepancies involving third-party reporting (like W-2s, 1099s for freelance/interest/dividends) through automated checks, leading to CP2000 notices and potential penalties if missed; however, cash income, crypto, or lifestyle mismatches can also trigger scrutiny, though it's less certain than reported income, and high-income non-filers are a current focus.
For most payments to individuals (like contractors or for other income/rents), the 1099 reporting threshold is $600, though this increases to $2,000 for tax years starting after 2025 under new law; for payment apps (Form 1099-K), the old threshold was $20,000/200 transactions, but for 2024, a phased-in $5,000 threshold was planned, with the $20k/200 rule (and $10+ in royalties/broker payments) remaining for now for 1099-MISC. Key forms are 1099-NEC for non-employee compensation and 1099-MISC for other payments, with 1099-K for third-party platform payments.
File your late 1099s as soon as possible: The sooner you file, the lower the penalty. Filing late is always better than not filing at all. Check information for accuracy: Correct TINs, names, and amounts before submitting. Incorrect payee information can create additional penalties later.
The biggest tax mistakes people make include filing late, math errors, incorrect personal info (like Social Security numbers), forgetting deductions/credits (like EITC), misreporting income, not signing forms, and making errors with bank details for direct deposit, all leading to delays, penalties, or missed savings, with using tax software or professionals helping avoid these common pitfalls.
Even though the IRS audits only a small fraction of tax returns, the IRS matches nearly all Forms 1099 against your Form 1040, sending automated notices to pay up if you forget to report one.
However, while the IRS can go back to any unfiled tax return, they generally don't try to enforce filing requirements for returns older than six years. The only exceptions might be if they: Find signs of fraudulent or illegal behavior. Need the information to inform returns for later tax years.
Can you still get a refund if you forgot a 1099? Yes, you can. You'll just have to file an amended return by whichever of these is later: Within three years of filing.
If you are worried that you forgot to file a 1099, or if you recently caught a mistake on a 1099, you typically have three years to rectify the mistake but may differ depending on the form.
Key Takeaways
If a business intentionally disregards the requirement to provide a correct Form 1099-NEC or Form 1099-MISC, it's subject to a minimum penalty of $660 per form (tax year 2025) or 10% of the income reported on the form, with no maximum.
A 1099 requirement is triggered when a business pays an independent contractor or unincorporated entity $600 or more (increasing to $2,000 after 2025) in a calendar year for services, or makes other specific payments like royalties or rents, requiring the payer to report these to the IRS using Form 1099-NEC (for services) or 1099-MISC (for other income), unless the recipient is a corporation (with exceptions for law firms).
For services performed in 2025 and prior, you get a 1099-NEC (or MISC) if you earn $600 or more from one business; starting in tax year 2026, that threshold increases to $2,000 for Form 1099-NEC and Form 1099-MISC, adjusted for inflation in later years, but you must always report all self-employment income, regardless of whether you receive a form.
With the use of an automated system, theAutomated Underreporter, the IRS compares the income reported by these third parties to the income reported on your return. This allows the IRS to notice potential discrepancies. If there is a potential discrepancy, a tax examiner will look further into your reported income.
What Not to Say During an Audit?