Sales tax obligation tracking

Nexus triggers: physical presence (offices, employees, inventory/warehouses, trade shows, agents) and economic nexus (sales revenue and/or transaction-count thresholds post-Wayfair). States vary on thresholds and measurement periods; many use $100,000 or 200 transactions but several states use different thresholds (e.g., California and Texas have $500,000; New York $500,000 & 100 transactions). States also diverge on whether exempt sales and marketplace sales count toward thresholds.- Marketplace facilitator laws: Most states have enacted marketplace facilitator rules shifting the collection obligation to the marketplace (e.g., Amazon, eBay) for third-party sales; however, sellers still need to understand exposures for off-marketplace sales and potential registration requirements.- Registration and timing: Once nexus is triggered, businesses must register for a sales tax permit with the state revenue agency and begin collecting, filing, and remitting by the state’s required effective/registration date. States differ on when liability begins and how far back they may assess back taxes.- Filing frequency and returns: States set filing frequencies (monthly, quarterly, annual) often based on tax liability or volume; missing filings causes penalties, interest, and audit risk. Payment methods and electronic filing requirements differ by state.- Taxability and exemptions: State rules diverge on taxability of goods, services, digital products, SaaS, and bundled transactions; states have different resale/exemption certificate rules and acceptance processes (Streamlined Sales Tax provides a uniform certificate for participating states).- Recordkeeping and audits: States expect sellers to retain sales records, exemption certificates, and supporting documentation (often multi-year retention requirements). Failure to maintain records increases audit risk and exposure for back taxes, penalties, and interest.- Best practices for tracking obligations: - Build a nexus matrix to track physical presence, inventory, employees, affiliates, and economic thresholds per state. - Use rolling 12-month or calendar-year calculations per state rule; set alerts when approaching thresholds. - Centralize exemption certificate collection and verification (e.g., use certificate-management tools). - Automate tax calculation, filing, and returns with reputable providers (Avalara, TaxJar, TaxCloud, Vertex, Sovos) and reconcile tax collected vs. remitted. - Maintain a compliance calendar (registration dates, filing due dates, renewal deadlines) and a process for voluntary disclosures/registration if back-tax exposure exists. - Monitor legislative updates (state DO R sites, MTC, SSTGB) and marketplace changes.

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