Sales Tax Resource Library
In-depth guides written by sales tax attorneys, CPAs, and former state auditors. Free to access — no account required.
Compliance & Defense Guides
From understanding your exposure to fighting an audit in court — written by attorneys, CPAs, and former state auditors.
Before a Problem
Understand your exposure before a state finds you — nexus analysis and voluntary disclosure.
During an Audit
You received a notice. Here's what happens, what to do, and how to control the process.
Sales Tax Audit Overview
How businesses get selected for audit — and what to do when the notice arrives.
The Sales Tax Audit Process
From the initial notice to the final assessment — a complete walkthrough.
Managing Sales Tax Auditors
What to give them, what to withhold, and when to push back.
Sales Tax Audit Resolution
How to challenge an assessment, meet deadlines, and fight back on the facts and the law.
Statute of Limitations
How far can an audit go back? When to use the SOL as a defense.
Fighting Back
When the state won't back down — administrative court, tax court, and what it takes to win.
Industry Guides
Sales tax rules vary dramatically by industry. Find your sector for targeted guidance.
Construction
Contractors, builders, and real property improvement — gotcha rules and common audit triggers.
Online Sellers
Nexus, marketplace facilitators, Wayfair compliance for e-commerce businesses.
Restaurants & Food Service
Food, beverages, and related services — state-by-state taxability rules.
Computer Software & SaaS
How states tax software — physical, electronic, and subscription delivery.
Convenience Stores
Gas stations, c-stores, and small-format retail — fuel, tobacco, alcohol, and prepared food rules.
State-by-State Guides
General sales and use tax rules, rates, and audit guidance for every state.
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