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IRS Notice of Deficiency: What 1099 and Self-Employed Workers Need to Do
If you received an IRS Letter 3219, CP3219A, or CP3219N, the IRS calls this a Notice of Deficiency. You have exactly 90 days from the date printed on the notice to act, and this deadline cannot be extended.
What Notice of Deficiency Actually Means
A Notice of Deficiency is the IRS telling you it believes you owe more tax than you reported, usually because a 1099-NEC, 1099-K, or 1099-MISC filed by a client or platform does not match what showed up on your return. For self-employed people and independent contractors, this often happens when a client sent you a 1099 but you did not report all of it, or the IRS never received a return from you at all.
This letter typically arrives after an earlier notice, usually a CP2000, that you did not resolve . It is sometimes called the 90-Day Letter because that is exactly what it gives you, or your ticket to Tax Court, because it is the document that lets you challenge the IRS in United States Tax Court.
The 90-Day Deadline Is Not Flexible
This is the part self-employed taxpayers get wrong most often, thinking they can call the IRS and buy more time. You cannot.
The clock starts on the mailing date printed on the notice, not the day you opened the envelope.
You have 90 days to file a petition with the U.S. Tax Court, or 150 days if the notice is addressed to you outside the United States.
If the 90th (or 150th) day falls on a weekend or legal holiday, the deadline moves to the next business day.
Electronic petitions must be filed by 11:59 p.m. Eastern Time on the last day. Late filings can result in the case being dismissed.
This deadline is set by law under IRC Section 6213 and the IRS has no authority to extend it, even if you are working with the IRS to resolve the issue in the meantime.
If you let the 90 days pass without filing a petition, the IRS assesses the tax, penalties, and interest in the notice, and collection can begin.
Your Three Options
File a Tax Court petition. If you disagree with the proposed deficiency, this is the only way to dispute it before paying. You file with the U.S. Tax Court, not the IRS, and while your case is pending the IRS generally cannot assess or collect the disputed amount.
Respond to the IRS directly during the 90 days. The IRS will work with you to resolve the issue during this window, for example by submitting documentation that supports your original numbers, but doing this does not stop the 90-day clock. If you send new information, do not assume it pauses your deadline.
Do nothing and let it become final. If you agree with the notice or miss the deadline, the IRS assesses the amount shown and moves to collection. At that point your options narrow to payment plans, an offer in compromise, or other collection alternatives, and you lose the right to contest the underlying amount in Tax Court.
What 1099 Workers Should Check First
Before deciding which path to take, pull your own records and compare them line by line against the notice.
Match every 1099-NEC, 1099-K, and 1099-MISC you actually received against what the notice claims was reported to the IRS. Sometimes a client double-files or a platform reports gross payments that include refunds or fees.
Gather your Schedule C, mileage logs, receipts, and bank statements for the tax year in question. Deductions the IRS disallowed in an audit are often reversible with documentation.
Check whether the notice followed an earlier CP2000 you missed. If your address changed and you never saw the CP2000, you still get the 90 days from the Notice of Deficiency, but this explains how you got here.
Confirm the notice's mailing date, not the date on the envelope postmark, since your deadline runs from that printed date.
A significant number of times the IRS will prepare a SFR, Substitution For Return, if you hadn't filed. In this case the IRS will take the least amount of deductions possible so your tax bill is the highest. In this case you, or SherpaCPAs, can file your real returns to lower your tax bill.
Why Self-Employed Taxpayers Face This More Often
1099 income does not have withholding, and multiple clients or platforms mean multiple information returns hitting the IRS system, each one a chance for a mismatch. A Schedule C also draws more IRS underreporter attention than a W-2 because the income and expenses both come from your own reporting rather than a third party. Getting a second set of eyes on your return before you file, and again if a notice shows up, closes most of these gaps before they turn into a deficiency notice.
What SherpaCPAs Does for You
SherpaCPAs is a fully digital CPA firm built for 1099 contractors and self-employed individuals, the realtors, stylists, consultants, delivery drivers, and freelancers who just want their taxes done right. If you received a Notice of Deficiency, Letter 3219, CP3219A, or CP3219N, our IRS resolution service reviews your notice against your actual records, tells you within days whether the IRS is right, and handles the response or Tax Court petition timeline for you so you do not miss the 90-day window.
Received an IRS Notice of Deficiency? Schedule a free intake call with SherpaCPAs today and get a clear answer before your deadline runs out.
We also offer a low-cost monthly CPA membership so a mismatched 1099 never turns into a surprise notice again.
Ready to fix your notice or get ahead of next year's 1099s? Contact SherpaCPAs now.
This article is for general information and is not tax or legal advice. Every notice and tax situation is different. Contact SherpaCPAs or a qualified tax professional before your deadline.
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