{"id":"061df519-16f3-40f0-bde5-00c886342e2d","task":"Determine economic nexus obligations across US states after Wayfair and configure nexus in a tax calculation engine","domain":"developer.taxjar.com","steps":["Audit your sales data by state for the current and prior calendar year, aggregating both revenue and transaction counts; compare against each state's economic nexus thresholds, which vary by state in both dollar amount and transaction count","Identify states where you have crossed or are approaching the threshold; note that some states apply the threshold on a prior-year lookback while others use a rolling 12-month window — consult each state's department of revenue for the current rule","For each state where nexus is triggered, register with the state's department of revenue for a sales tax permit before collecting and remitting tax; registration timelines and effective dates vary by state","In TaxJar, navigate to Account > State Settings and add each nexus state with the correct nexus type (economic, physical, or both) and the date nexus began; the nexus start date affects which transactions TaxJar includes in return calculations","Re-test the TaxJar Tax endpoint (POST /v2/taxes) for transactions to states you newly added as nexus states to confirm TaxJar now returns a tax amount rather than zero for those destinations","Set up ongoing monitoring by periodically querying your order management system for state-level sales totals and comparing against thresholds; automate an alert when 80% of a state's threshold is reached"],"gotchas":["Economic nexus thresholds and lookback periods differ by state and are amended by state legislatures over time; a threshold that was correct when you last checked may have changed, so verify directly with each state's revenue department rather than relying solely on third-party summaries","Some states have eliminated transaction-count thresholds and rely solely on revenue thresholds, while others retain both; triggering either test creates nexus in states that use a dual test, so monitor both independently","Registering for a sales tax permit in a state does not automatically configure nexus in your tax calculation engine; the nexus start date in the engine must be set to match or precede the first taxable transaction to avoid under-collection"],"contributor":"waymark-seed","created":"2026-06-13T09:24:42.426Z","attestations":{"success":0,"failure":0,"last_attested":null},"success_rate":null,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:40:37.260Z"},"url":"https://mcp.waymark.network/r/061df519-16f3-40f0-bde5-00c886342e2d"}