Facing a Florida Sales Tax Audit? How the Process Works and the Deadline That Can End Your Right to Fight

What the Department can review, what happens when you disagree with the auditor, and how to protect your right to challenge an assessment

A letter from the Florida Department of Revenue announcing a sales and use tax audit gets every business owner's attention. Most owners focus on the auditor and the records, and that matters. But for many businesses, the biggest risk comes later, in a single notice that starts a deadline that is easy to miss.

This article walks through the Florida sales and use tax audit step by step: what the Department can review, what happens when you disagree with the auditor, and how to protect your right to challenge an assessment.

What a Florida Sales Tax Audit Is

A sales and use tax audit is the Department's review of your books and records to check whether your business collected, reported, and paid the right amount of tax. Sales tax is the tax a business collects from customers on taxable sales. Use tax generally applies to taxable purchases on which the seller did not collect the tax.

An audit can go either way. If the Department finds you overpaid, it must credit or refund the overpayment, and it offsets overpayments against any underpayments for the same audit period. If it finds you underpaid, it can assess the additional tax plus penalties and interest.

One rule surprises many owners: under Florida law, a business that fails to collect tax on a taxable sale is generally liable for that tax itself. If you didn't charge the customer, the bill can come to you.

Step 1: The Audit Notice

Florida law generally requires 60 days' written notice before an audit begins, with exceptions for situations where the tax is at risk. Read the notice right away and confirm the business name, account number, tax type, locations, and audit period.

If you did not waive the notice period and believe the audit started early, you must object in writing before an assessment is issued. Otherwise, the objection is lost.

Step 2: Gather and Protect Your Records

Florida requires businesses to keep suitable books and records, including invoices, bills of lading, and other relevant documents, until the Department's time to assess tax runs out. For most taxes, that period is generally three years after the latest of the date the tax was due, the date the return was due, or the date the return was filed.

Records matter because the Department fills in the gaps itself. If a business does not provide records, the Department must estimate the tax using the best information available. That means a business can end up with an estimated assessment even if it handled its transactions correctly.

Practical steps that help:

• Stop routine deletion. Suspend destruction or overwriting of paper and electronic records for the audit period.
• Pick one point of contact. One person should speak with the auditor so answers stay accurate and consistent.
• Reconcile before you produce. Compare your returns to your general ledger, sales and purchase records, and payment history before handing anything over.
• Check exemption and resale certificates. Match each certificate to the right customer, transaction, and period. A fraudulent certificate carries severe civil and criminal consequences.
• Keep a log. Record what you produced, when, and in response to which request, and keep notes of meetings with the auditor.

If the auditor proposes reviewing only a sample of transactions and projecting the results across the whole period, ask for the method in writing: the group of transactions sampled, how items were selected, how credits and reversals were treated, and how the results were projected. Don't treat an early conversation about sampling as an agreement.

Step 3: The Notice of Intent to Make Audit Changes

When the auditor finishes, the Department may issue a Notice of Intent to Make Audit Changes, which lists the changes the auditor proposes. This is your chance to fix factual, paperwork, and math errors before a formal assessment.

You generally have 30 consecutive calendar days from the date the notice is issued to request a conference in writing, postmarked or faxed. Before that period ends, you may request a 30-day extension in writing, and you may request another 30-day extension during the first one. Miss the window without an extension and you lose the conference.

Your request should identify each disputed item, explain your tax treatment, attach supporting documents, point out any math errors, and state the correction you want and any basis for penalty relief.

Skipping this conference does not take away your later right to protest a proposed assessment. But it is a missed opportunity.

Step 4: The Notice of Proposed Assessment: The Notice That Matters Most

If the conference does not resolve things, or no conference is requested, the Department may issue a Notice of Proposed Assessment, often called a NOPA. The NOPA states the amount, the date the assessment becomes final if you do not protest, the protest procedure, and the last date to seek relief. A Florida appeals court has upheld a NOPA that stated these dates.

The NOPA creates two separate deadlines:

• The protest deadline. You must use the protest procedure stated in the NOPA before the proposed assessment becomes final.
• The 60-day review deadline. Once the assessment is final, you generally have no more than 60 days to start a formal challenge.

Count your deadlines from the dates in the notice, not from when someone at your office opened the envelope.

Step 5: Choosing Where to Challenge

After the assessment becomes final, Florida gives you two routes: an administrative proceeding under Chapter 120 of the Florida Statutes, Florida's administrative procedure law, or a lawsuit in circuit court. You must choose one. Starting one route generally bars the other for the same dispute.

Circuit court has a price of entry. You must pay the part of the assessment you do not dispute. For the disputed part, you ordinarily must deposit the amount, including penalties and interest, with the court or post a bond or other court-approved security, unless the Department's executive director waives that requirement in writing.

If You Missed the Deadline

Missing the final 60-day deadline ordinarily ends your ability to challenge whether the tax was correct. A later collection notice does not bring that right back. The authorities reviewed do not recognize a general “good excuse” exception for staff errors or lost mail.

Relief usually depends on showing the deadline never started or had not actually expired. For example, the notice may have been legally insufficient, the filing may in fact have been on time, or the Department may have changed the date in writing.

Not receiving the notice is not automatically enough. Due process requires notice that is reasonably likely to reach you, not proof that you actually received it in every case, especially when the Department used the contact information you reported.

How to Avoid Missing a Department Notice

• Keep your Department account information current, including mailing address, business address, email, and responsible parties.
• Route all tax mail to one designated person on the day it arrives, including mail sent to your registered agent or branch locations.
• Maintain active access to your Department online account, with at least two authorized administrators where permitted.
• Send tax emails and scanned notices to a monitored shared mailbox, not one employee's inbox.
• Calendar every deadline with two responsible people and multiple reminders.
• Escalate any audit notice, Notice of Intent, or NOPA the same day it is found.
• Keep proof of every filing and every extension. Review these controls at least quarterly and after any move or staff change.

Frequently Asked Questions

What is a Florida sales and use tax audit?

A sales and use tax audit is the Florida Department of Revenue's review of a business's books and records to check whether the business collected, reported, and paid the right amount of tax. An audit can go either way: if the Department finds an overpayment it must credit or refund it, offsetting it against underpayments for the same audit period, and if it finds an underpayment it can assess the additional tax plus penalties and interest.

How long do I have to request a conference after a Notice of Intent to Make Audit Changes?

Generally 30 consecutive calendar days from the notice's issuance, with written extensions available if you request them in time: a 30-day extension may be requested before the period ends, and another 30-day extension may be requested during the first one.

If I skip the audit conference, can I still protest the proposed assessment?

Yes. Missing the conference does not by itself eliminate the NOPA protest procedure, though the conference is a missed opportunity to fix factual, paperwork, and math errors before a formal assessment issues.

Does talking with the auditor extend my NOPA deadline?

No. Ongoing discussions, oral promises, or an unanswered extension request do not stop the clock. Treat every written deadline as fixed unless the Department changes it in a legally effective writing.

Can I challenge a Florida tax assessment in both circuit court and an administrative proceeding?

No. Florida gives two routes after an assessment becomes final, an administrative proceeding under Chapter 120 or a lawsuit in circuit court, and starting one route generally bars the other for the same dispute. Circuit court also requires paying the undisputed portion and ordinarily depositing the disputed amount or posting a bond, unless the requirement is waived in writing.

What happens if I miss the 60-day deadline after a Florida tax assessment becomes final?

Missing the final 60-day deadline ordinarily ends your ability to challenge whether the tax was correct, and a later collection notice does not bring that right back. Relief usually depends on showing the deadline never started or had not actually expired, for example because the notice was legally insufficient, the filing was in fact timely, or the Department changed the date in writing.

Key Takeaways

• A Florida sales tax audit can produce a refund as well as a bill.
• Good records are your best defense. Without them, the Department may estimate what you owe.
• Request a conference within 30 days of a Notice of Intent to Make Audit Changes.
• The NOPA starts the clock. Protest before the assessment becomes final, and file any challenge within 60 days after it does.
• Mail and calendar controls protect your right to fight an assessment.

This article provides general information about Florida sales and use tax procedure and is not legal advice for any particular business; reading it does not create an attorney-client relationship. Statutes, rules, and Department procedures change, deadlines are applied strictly, and whether any rule described here applies depends on a business's own records, transactions, filing history, and notices. Laws and authorities are cited as of October 2026.