A compliance notice is a formal letter from a government agency telling you that something — a tax return, a workplace condition, a business filing — doesn’t meet a legal requirement, and giving you a deadline to fix it or respond. Receiving one doesn’t mean the agency has decided you broke the law on purpose. It means someone, or some database match, flagged a gap between what the rules require and what the agency sees on its end. What you do in the next few weeks usually decides whether the matter closes quietly or turns into penalties, liens, or litigation.
Confirm the Notice Is Real Before You Do Anything
Scammers impersonate the IRS, OSHA, and other agencies constantly. The IRS warns that impersonators tend to demand immediate payment and threaten arrest or deportation, tactics the real IRS does not use.1Internal Revenue Service. Recognize Tax Scams and Fraud A legitimate IRS notice comes by mail, carries a specific notice number such as CP2000 or CP501, and references your Social Security number or tax year.
Treat other agency letters the same way. Look for official letterhead, a case or reference number, and a named contact with a verifiable phone line. If anything feels off, call the agency using the number on its official website, not the number printed on the letter you received.
Read the Notice for the Four Things That Actually Matter
Every compliance notice contains four pieces of information you need to pull out before anything else: the issuing agency, the specific rule or requirement at issue, the corrective action the agency wants, and the deadline for your response. The deadline governs everything else. Miss it and you can lose the right to dispute the agency’s findings at all.
Read the whole notice without skimming. Figure out exactly what the agency is claiming and what evidence it’s relying on. Then pull your own records — tax documents, inspection reports, payment receipts, correspondence — anything that confirms or contradicts the agency’s version. In a wage underpayment matter, for example, the Department of Labor may ask the employer to calculate what’s owed and provide proof of back pay.2U.S. Department of Labor. Fair Labor Standards Act Advisor – Enforcement Under the Fair Labor Standards Act
Respond by the Deadline, Using the Method the Notice Specifies
Some agencies accept online submissions. Others require mail. Some give both options. Use the method the notice names, keep copies of everything you send, and record the date you sent it.
If the deadline is too tight to gather what you need, contact the agency before it expires and ask for an extension. Many agencies grant reasonable requests when you ask in time. Asking after the deadline has passed is a different conversation, and usually a worse one.
If the Notice Is From the IRS
Most people searching for help with a compliance notice are holding a letter from the IRS. The type of notice determines your deadline and your options.
CP2000: Income Doesn’t Match What Was Reported to the IRS
A CP2000 means the income or payment information the IRS received from employers, banks, or brokerages doesn’t match what you reported on your return.3Internal Revenue Service. Understanding Your CP2000 Series Notice It is a proposal, not a bill. You can agree, partially agree, or disagree, and respond with documentation. If you ignore it, the IRS will eventually send a bill based on the proposed changes.
Math Error Notices
The IRS sends millions of math error notices each year when it finds arithmetic mistakes, inconsistencies, or entries that don’t match its records.4Internal Revenue Service. Internal Revenue Manual 21.5.4 – General Math Error Procedures Some are straightforward. Others flag items where the IRS believes you claimed a credit or deduction you weren’t entitled to, without fully explaining why. If you disagree, respond within the stated timeframe and include the documents that support your position.
Notice of Deficiency: The 90-Day Letter
This one carries the hardest deadline in the system. A statutory notice of deficiency, often called a 90-day letter, is the IRS formally saying it intends to assess additional tax. You have 90 days from the mailing date to file a petition with the U.S. Tax Court, or 150 days if the notice is addressed outside the United States.5Office of the Law Revision Counsel. 26 USC 6213 – Restrictions Applicable to Deficiencies; Petition to Tax Court Miss it and the tax gets assessed and your path to Tax Court is gone. The IRS warns that asking for reconsideration does not pause or extend the 90-day clock.6Internal Revenue Service. Internal Revenue Manual 4.8.9 – Statutory Notices of Deficiency If you plan to contest the proposed deficiency, write the deadline on your calendar the day the notice arrives.
How to Dispute or Appeal
You almost always have the right to push back. The procedure depends on the agency.
IRS Appeals
The Taxpayer Bill of Rights guarantees the right to challenge the IRS’s position, be heard, and appeal in an independent forum.7Internal Revenue Service. Taxpayer Bill of Rights In practice, the IRS Independent Office of Appeals reviews your dispute separately from the examiner who flagged the issue. Appeals conferences are informal. You can represent yourself or bring a CPA, enrolled agent, or attorney.8Internal Revenue Service. Topic No. 151, Your Appeal Rights When you receive an audit report or adjustment letter, you typically get 30 days to request an Appeals conference. If Appeals doesn’t resolve the matter, you can take it to court.
OSHA Citations
An employer who receives an OSHA citation has 15 working days from receipt to file a written notice of intent to contest with the area director. Once that deadline passes, the citation becomes a final order.9Occupational Safety and Health Administration. 29 CFR 1903.17 – Employer and Employee Contests Before the Review Commission A contested citation goes to the Occupational Safety and Health Review Commission, where an administrative law judge hears the case.
Other Federal Agencies
Most federal agencies offer some form of administrative hearing before penalties become final. The FDA, for example, sends a “Pre-Notice” before formal noncompliance findings, giving the responsible party a chance to take corrective action before civil money penalties are considered.10U.S. Food and Drug Administration. ClinicalTrials.gov – Notices of Noncompliance and Civil Money Penalty Actions Deadlines and procedures differ, so check the notice and the agency’s website for the appeal path that applies to your situation.
Recovering Legal Fees If You Win
If you successfully contest a federal agency’s position, the Equal Access to Justice Act may let you recover attorney fees and litigation costs. Individuals qualify with a net worth under $2 million, and businesses with a net worth under $7 million and no more than 500 employees. The government has to prove its position was “substantially justified”; if it can’t, you can recover fees. Applications must be filed within 30 days of the final judgment.11Office of the Law Revision Counsel. 28 USC 2412 – Costs and Fees
Getting Penalties Reduced When the Agency Is Right
Even when the IRS has the underlying tax correct, you may be able to get penalties reduced or removed. Two paths cover most situations.
First-Time Penalty Abatement
If you’ve been compliant for the past three years, meaning you filed all required returns and had no penalties during that period, you can qualify for first-time abatement. It applies to failure-to-file, failure-to-pay, and failure-to-deposit penalties, and you can request it by phone using the number on your notice.12Internal Revenue Service. Administrative Penalty Relief It’s the easiest penalty relief to obtain, and many taxpayers never ask because they don’t know it exists.
Reasonable Cause Relief
If first-time abatement doesn’t apply, you can request relief by showing reasonable cause. The IRS evaluates these case by case, but common grounds include serious illness, natural disasters, reliance on bad professional advice, or inability to obtain necessary records. You’ll need documentation — hospital records, disaster declarations, correspondence with a tax preparer — showing you exercised ordinary care but still couldn’t meet the deadline.13Internal Revenue Service. Penalty Relief for Reasonable Cause Simpler cases can go through a phone request. More complex situations usually go in writing on Form 843.
What Happens If You Ignore It
The consequences scale with the severity of the violation and how long it sits.
Ignore a CP2000 and the IRS assesses the proposed tax plus penalties and interest. Ignore a notice of deficiency and you lose the right to petition Tax Court. Ignore collection notices and you can face wage garnishment, bank levies, and federal tax liens on your property.
On the workplace safety side, OSHA penalties after inflation adjustments currently reach up to $16,550 per serious violation and $165,514 per willful or repeat violation. The underlying statute sets base amounts that are adjusted annually for inflation.14Office of the Law Revision Counsel. 29 USC 666 – Civil and Criminal Penalties Willful violations resulting in a worker’s death can trigger criminal prosecution with potential imprisonment.
For the FDA, failure to address a noncompliance notice within 30 calendar days can result in civil money penalties, injunctions, or criminal prosecution.10U.S. Food and Drug Administration. ClinicalTrials.gov – Notices of Noncompliance and Civil Money Penalty Actions Businesses that contract with the federal government face another risk: compliance failures can lead to debarment or suspension from government contracting, cutting off a major revenue stream.15Acquisition.GOV. Subpart 9.4 – Debarment, Suspension, and Ineligibility
Keep the Records After You Respond
Don’t throw anything away once the matter is resolved. Hold on to the original notice, your response, all supporting documents, and any confirmation or closing letter from the agency. Federal regulations require recipients of federal awards to retain compliance records for at least three years from the date of the final report, longer if litigation, claims, or audits remain open.16eCFR. 2 CFR 200.334 – Record Retention Requirements
Even outside the federal-award context, keeping records for three to seven years is sound practice. Agencies can reopen cases, and if the same issue surfaces again, your prior response becomes evidence that you acted in good faith. Store copies both digitally and in hard copy so you can produce them quickly.
When to Bring in a Professional
Not every compliance notice calls for a lawyer or CPA. A straightforward math error you can see on the page is usually fine to handle yourself. Some situations are different:
- A notice of deficiency, because the 90-day Tax Court deadline is unforgiving and the stakes are high.
- A large proposed assessment, where the cost of representation often pays for itself through reduced liability or penalty abatement.
- An OSHA willful citation, where penalties can exceed $100,000 and criminal exposure is possible.
- Multiple or recurring notices, which usually point to a systemic problem a professional can diagnose.
- Any notice you don’t fully understand. A wrong response can be worse than a late one.
For IRS disputes, enrolled agents, CPAs, and tax attorneys can all represent you before the agency and in Appeals conferences. For OSHA and other regulatory matters, look for attorneys who work in administrative law or the specific regulatory area involved.