What Happens When Someone Forgets to File a 1099 on Their Tax Return?You should receive a Form 1099 if a business or government entity sent you money during the year that is reportable on your taxes.A 1099 form is an informational form you receive - not a tax document you fill out. If a business or government entity sends you money during the year that is reportable on your taxes, you should receive a Form 1099.There are many different kinds of 1099 forms. For example, 1099-DIV informs the IRS that you were paid potentially taxable dividend income; Form 1099-C reports the cancellation of a debt, which is sometimes a taxable event and Form 1099-MISC reports payments to independent contractors. Dozens of special situations call for a Form 1099 but they all cover payments you receive that may potentially be taxable.IRS reportingSince the 1099 form you receive is also reported to the IRS, the government knows about your income even if you forget to include it on your tax return. Once the IRS realizes that you owe additional tax on your unreported 1099 income, it will notify you and retroactively charge you penalties and interest beginning on the first day your tax payment is late.Amending your tax returnIf you catch the error before the IRS contacts you, then you should file an amended tax return on Form 1040X, Amended U.S. Individual Tax Return. When you amend a tax return, don't complete your entire return over. All you need to do is update the form with any figures that change as a result of the additional income.However, if any of your schedule attachments change, you must complete the entire schedule again. Most importantly, be sure to include a copy of the 1099 with the amended return and include a payment for any tax you now owe. If you are still awaiting a refund from the original return, wait until you receive it before filing Form 1040X.<a href="https://turbotax.intuit.com/tax-tools/tax-tips/IRS-Tax-Return/What-Happens-When-Someone-Forgets-to-File-a-1099-on-Their-Tax-Return-/INF14528.html" >https://turbotax.intuit.com/tax-tools/tax-tips/IRS-Tax-Return/What-Happens-When-Someone-Forgets-to-File-a-1099-on-Their-Tax-Return-/INF14528.html</a> side note: I used to work for Intuit years ago. I started off supporting Turbo Tax at their call center. I sure DON'T miss those days. Towards the end of tax season, say we closed at 9 PM. At 8:59 PM, if there were still over a hundred calls in the que, we had to take them all. As the last call was taken, you could hear the cheers and clapping throughout the cubicles! hahahaha