A sales tax audit occurs when a state tax authority reviews a business’s financial records to verify whether sales tax has been collected, reported, and remitted correctly.
Audits are typically conducted when tax authorities suspect that a business may have unpaid tax liabilities or compliance issues.
Understanding the sales tax audit process helps businesses prepare properly and respond effectively if an audit occurs. If you are unfamiliar with audit triggers, begin with the guide: Common Sales Tax Audit Triggers.
Audit Notification
The audit process usually begins when the state tax authority sends a formal notice informing the business that it has been selected for an audit.
This notification may include:
- The audit period being reviewed
- Instructions for providing financial records
- Contact information for the assigned auditor
- Deadlines for submitting documentation
The audit period may cover several years depending on state rules and the nature of the investigation. Businesses should review the notice carefully and gather the requested information promptly.
Records Requested During an Audit
Auditors typically request financial records that help determine whether sales tax was reported correctly.
Common records include:
- Sales invoices
- Sales tax returns
- General ledger reports
- Bank statements
- Purchase records
- Shipping documentation
These records help auditors compare reported sales with actual business activity. Businesses that maintain organized financial records often experience smoother audit processes.
Evaluating Nexus Obligations
During an audit, tax authorities may also evaluate whether the business created nexus within the state.
Auditors may review:
- Revenue generated within the state
- Shipping records and delivery data
- Inventory stored in warehouses
- Employee work locations
If auditors determine that nexus existed but the business was not registered, they may require the business to register and pay unpaid tax liabilities.
To review nexus thresholds across states, visit Economic Nexus by State. Businesses can estimate nexus exposure using the economic nexus calculator.
Tax Calculation and Assessment
After reviewing financial records, auditors calculate the amount of sales tax that should have been collected and remitted.
This calculation may include:
- Unreported taxable sales
- Underreported tax amounts
- Incorrect tax rate calculations
If discrepancies are identified, the auditor prepares a tax assessment outlining the amount owed.
The assessment may include:
- Unpaid tax
- Interest on unpaid balances
- Penalties for non compliance
More details about penalties are explained in How States Calculate Sales Tax Penalties.
Audit Resolution
Once the audit assessment is issued, businesses may review the findings and respond to the tax authority.
Possible outcomes include:
- Paying the assessed tax liabilities
- Negotiating adjustments to the audit findings
- Entering payment plans for large balances
- Providing additional documentation to support tax reporting
Businesses should carefully review the audit results before accepting the assessment.
Preventing Future Audit Issues
Businesses can reduce audit risk by maintaining accurate records and monitoring nexus obligations regularly.
Important compliance steps include:
- Tracking revenue by state
- Monitoring inventory storage locations
- Reviewing sales tax filings regularly
- Registering for sales tax when nexus is triggered
Companies that discover exposure early may be able to address issues before an audit occurs. Businesses can estimate potential liabilities using the sales tax exposure calculator.
If you are evaluating sales tax obligations for your business, you can start with the Economic Nexus Guide and review state requirements in the Economic Nexus by State reference.
Businesses assessing potential liability often begin with a Sales Tax Exposure Analysis or estimate potential exposure using the Sales Tax Exposure Calculator.
If you operate across multiple states, the Economic Nexus Tracker can help monitor when thresholds may be triggered.
Businesses evaluating potential audit risk can review their exposure profile using the Sales Tax Risk Report or generate a detailed Nexus Exposure Report.
You can also understand When Sales Tax Exposure Becomes a Risk and what may happen if exposure is ignored in the What Happens If You Ignore Sales Tax Exposure guide.
FAQs
What happens during a sales tax audit?
The state reviews financial records to determine whether sales tax was collected and reported correctly.
What records do auditors review?
Auditors typically review sales invoices tax returns bank statements and accounting records.
Can audits determine nexus obligations?
Yes auditors may review sales activity inventory and employee locations to determine nexus.
What happens if auditors find unpaid tax?
The state may issue a tax assessment including unpaid tax interest and penalties.
How can businesses prepare for an audit?
Businesses should maintain accurate financial records and monitor nexus obligations regularly.
