Audits, Penalties & Back Filing

Can a VDA protect me from penalties and interest on past-due sales tax?

A VDA typically waives penalties on past-due sales tax. Interest is usually still owed. The combined benefit (penalty waiver plus a limited 3–4 year lookback) is the main reason VDAs are the standard resolution path for significant back-tax exposure.

Can I just start collecting sales tax going forward without addressing past exposure?

You can start collecting going forward at any time, and you should. But starting to collect doesn't eliminate your prior liability. The past exposure stays on the table until you actively resolve it.

Do I need to backfile sales tax for periods I missed?

Yes, if you had nexus in a state and didn't file, you owe tax for the periods you missed and should backfile. Simply starting to collect going forward doesn't resolve past liability. The question is how to address it: through voluntary disclosure (VDA), direct back-filing, or a managed amnesty program.

Does Amazon's 1099-K data alert states that I may owe sales tax?

Amazon files 1099-K forms with the IRS, which shares data with state revenue agencies. States use this data to identify sellers with apparent in-state sales who aren't registered. Here's how the exposure works.

How are sales tax penalties calculated?

Sales tax penalties are typically calculated as a percentage of the unpaid tax, commonly 5-25% depending on the state and the type of violation. Late filing and late payment carry smaller penalties than failure to collect or fraud. Interest accrues separately, typically at annual rates of 3-12% compounded monthly or annually.

How do I prepare for a sales tax audit?

When facing a sales tax audit, the first steps are to understand the audit scope, gather relevant records, review your exemption certificate files, and decide whether to engage a tax professional. Don't respond to the auditor without first understanding what they're looking for and verifying your documentation is complete.

How do I prioritize which states to address first if I have exposure in many states?

Prioritize states by dollar exposure: largest sales volume in states where you've been non-filing longest. Secondary factors include audit aggressiveness, whether a state's economic nexus threshold has been crossed for years, and whether an MTC multi-state VDA can address multiple states simultaneously.

How do I use the MTC multi-state VDA program to file in multiple states at once?

The MTC (Multistate Tax Commission) National Nexus Program allows sellers to submit a single anonymous voluntary disclosure application covering multiple participating states simultaneously. This is more efficient than managing separate state-by-state VDA negotiations for sellers with exposure in many states. The MTC facilitates the process; each state still negotiates and executes its own agreement.

How far back can a state go in a sales tax audit?

For filed returns, states typically have 3–4 years to audit. For unfiled periods, the statute of limitations never starts, states can reach back indefinitely. Here's the critical distinction and how VDAs change the math.

How far back do I owe sales tax?

Your sales tax liability runs from the date your nexus began. A VDA limits the lookback to 3–4 years and waives penalties. Without a VDA, a state audit can generally reach back 3–6 years or more.

How long do I need to keep sales tax records?

Most states require sales tax records to be kept for 3-5 years from the return due date or filing date. Because audit lookback periods can extend 3-7 years and exemption certificates are tied to the last transaction with a customer, a practical retention policy of 7 years covers most scenarios.

I haven't been collecting sales tax — what do I do now?

You have three options when you realize you haven't been collecting sales tax: register and pay retroactively, pursue a Voluntary Disclosure Agreement, or do nothing. Only one of these resolves your exposure cleanly.

Is there a penalty waiver for first-time sales tax noncompliance?

Some states offer first-time penalty abatement or waiver for sellers with no prior compliance history. Most require the seller to have a clean record in that state and to have paid the tax in full before requesting abatement. A VDA is the more reliable path to penalty relief for sellers with significant back-tax exposure.

Should I hire a CPA or a tax attorney to handle a sales tax audit?

For most sales tax audits, a CPA or sales tax consultant with state tax experience is the right choice. A tax attorney is better suited when the audit involves potential fraud, criminal exposure, or litigation. The key is choosing a specialist in state and local tax (SALT), not a generalist.

What are the penalties for not collecting or remitting sales tax?

Penalties for not collecting sales tax typically run 10–25% of the tax owed per period, plus interest at 0.5–1.5% per month. A VDA waives penalties. Here's how the numbers actually work.

What does the back-filing process actually look like, step by step?

Back-filing sales tax means reconstructing taxable sales by state and period, registering, filing amended or late returns, and remitting the tax owed. Here's what that process actually involves.

What is a Voluntary Disclosure Agreement (VDA) and when should I use one?

A Voluntary Disclosure Agreement (VDA) is a formal arrangement between a taxpayer and a state allowing the seller to come forward, pay back taxes for a limited lookback period, and receive penalty (and sometimes interest) waiver in exchange. VDAs are typically anonymous until accepted, and limit liability to 3-4 years rather than the full statute of limitations.

What is the difference between negligence penalties and fraud penalties for sales tax?

Negligence penalties apply when a taxpayer fails to meet compliance obligations without intentional wrongdoing, typically 10-25% of unpaid tax. Fraud penalties are reserved for intentional evasion and are significantly higher, often 50-100%, and may include criminal referral. Most small-business noncompliance falls in the negligence category, not fraud.

What is the lookback period for a sales tax VDA?

The lookback period for a sales tax VDA is typically 3-4 years, compared to the 3-7 year statute of limitations for a state-initiated audit. Most states limit VDA lookback to 3 years of prior periods. Sellers who started their nexus exposure more recently may owe for a shorter period than the standard VDA lookback.

What records and documentation does a state auditor typically request?

State sales tax auditors typically request sales journals, general ledgers, sales tax returns, exemption certificates for all exempt sales, purchase records, and documentation supporting taxability determinations. They may also request access to your accounting system or POS data. Having these organized and retrievable significantly impacts audit outcomes.

What should I do if I receive a sales tax notice from a state?

When you receive a sales tax notice, read it carefully to understand what's being requested, note any response deadlines, and don't ignore it. Notices range from routine information requests to audit initiation letters to assessments. The appropriate response depends on the notice type, and deadlines are strictly enforced.

What triggers a sales tax audit for an online store?

Sales tax audits for online stores are most often triggered by 1099-K data from marketplaces, nexus questionnaires, cross-state information sharing, and discrepancies in filed returns. Here's what actually puts you on a state's radar.