Track post-Wayfair economic nexus state by state, handle marketplace-facilitator law, build the multi-state registration and filing checklist, manage exemption certificates, and resolve tax-on-shipping rules, ending in a state-by-state exposure report.
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Templates and analytical tools only - not personalized financial, tax, accounting, or legal advice. State sales-tax thresholds, marketplace-facilitator rules, exemption certificate formats, and product taxability classifications change frequently and vary substantially by state. Review with a qualified sales-tax specialist, CPA, or attorney before relying on outputs. Failure to register and remit in a state where nexus exists creates retroactive liability + penalties + interest.
Finance - Sales Tax / Wayfair Economic Nexus
Build a state-by-state nexus exposure report and multi-state filing checklist. Handles physical nexus, post-Wayfair (2018) economic nexus, marketplace-facilitator laws, exemption certificate management, and tax-on-shipping rules.
What is the Finance - Sales Tax / Wayfair Economic Nexus skill?+
Track post-Wayfair economic nexus state by state, handle marketplace-facilitator law, build the multi-state registration and filing checklist, manage exemption certificates, and resolve tax-on-shipping rules, ending in a state-by-state exposure report.
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Per-state sales data for the trailing 12 months and current year:
Total gross sales $
Number of transactions
Whether sold via marketplace facilitator
Product / service categories (taxability varies - SaaS, digital goods, food, clothing, services treated differently by state)
Filing year (rules update annually)
Wayfair economic nexus - the 2018 inflection
Before South Dakota v. Wayfair (2018), states required physical presence before they could compel out-of-state sellers to collect sales tax. Wayfair upheld South Dakota's law imposing collection duty on remote sellers exceeding $100,000 in sales OR 200 transactions per year. All states with sales tax now have economic nexus rules (45 states + DC). Specific thresholds, transaction-count tests, look-back periods, and registration triggers vary by state.
Common state thresholds (verify against state tax authority - these change)
Tier
Examples
Threshold (re-verify)
Largest tier ($500K)
CA, NY, TX
$500,000 (no transaction count)
$250K
KY, MD
$100K-$250K (varies)
$100K + 200 transactions
Most states historically
$100K OR 200 transactions
$100K only (200-tx test removed)
Many states have dropped the transaction count
$100K
AK
Multiple municipalities; ARSSTC
Varies by city
⚠️ States have been removing the 200-transaction test over the past 3 years to reduce small-seller burden. Always verify current threshold for the state you're checking.
Look-back period - varies by state
Some states (most): prior calendar year OR current year-to-date. Some states: prior 12 rolling months. Once threshold is exceeded, registration is typically required within 30 days to the next month - verify per state.
Five states with NO statewide sales tax
NOMAD: New Hampshire, Oregon, Montana, Alaska, Delaware. (AK has many municipal sales taxes - see ARSSTC.)
Marketplace facilitator laws
Since 2018–2020, every state with sales tax has enacted Marketplace Facilitator laws requiring platforms (Amazon, Etsy, eBay, Walmart, Shopify-as-marketplace, etc.) to collect and remit sales tax on behalf of third-party sellers.
Implications for SMB sellers:
Marketplace-collected sales tax is NOT the seller's tax obligation - but counts toward economic-nexus thresholds in many (not all) states.
Direct sales (own website / Shopify standalone / Faire / WooCommerce) are NOT covered by marketplace facilitator → seller still must register and remit if nexus.
Some states allow seller to deduct marketplace sales when calculating nexus; others include marketplace sales in threshold calculation. Verify per state.
Seller must maintain records distinguishing marketplace vs direct sales for audit.
Tax-on-shipping rules (varies wildly by state)
State
Shipping taxable?
CA
Generally not taxable if separately stated and actual cost; taxable if charged as a flat handling fee
NY
Taxable if the underlying goods are taxable
TX
Taxable if the underlying goods are taxable
IL
Generally not taxable if separately stated and direct shipment to customer
FL
Taxable if delivery is part of the sale; varies by contract
Most states
Taxable if the goods are taxable; some exempt if separately stated
AK
No statewide; depends on municipality
Always re-verify per state and re-verify product taxability (SaaS, food, clothing, digital goods all vary).
Exemption certificate management
When a buyer claims a sales-tax exemption (resale, manufacturer, nonprofit, government, agricultural), the seller must collect and retain a valid exemption certificate before zero-rating tax. Otherwise the seller is liable for the tax on audit.
Best practices
Use Streamlined Sales Tax (SSUTA) Multi-State Exemption Certificate for participating states (24 SST states accept)
Otherwise use state-specific form (CA CDTFA-230, NY ST-120, TX 01-339, etc.)
Store certificate digitally with expiration date (some states require renewal annually; some are good "until revoked")
Include: buyer name, address, sales tax permit number, type of exemption claimed, signed declaration
Audit-readiness: link each exempt sale to the supporting certificate
Re-collect when buyer's permit expires or buyer changes legal entity
Multi-state filing checklist
For each state where nexus is established:
☐To do:
Register for sales tax permit (apply at state revenue / DOR website)
☐To do:
Determine filing frequency (monthly / quarterly / annually - typically based on volume)
☐To do:
Set up tax-collection in cart / POS (right rate by destination ZIP, including local / district / special)
☐To do:
Calendar filing deadlines (typically 20th of following month, but varies)
☐To do:
Track gross sales, taxable sales, exempt sales separately per state
☐To do:
Track local / district / special-purpose tax allocations within state where required
☐To do:
File timely (most states impose late penalties + interest even on $0 returns)
☐To do:
Zero-return obligation - most states require filing a return even if no sales were made in the period
☐To do:
Update for sourcing rules (destination vs origin) - most states use destination sourcing for remote sellers post-Wayfair
☐To do:
Renew permits where required
Voluntary Disclosure Agreement (VDA)
If you discover historical nexus exposure (sold into a state for years without registering), DO NOT simply register going forward - registration date often triggers state look-back to your earliest nexus date with full penalties + interest. Instead:
Engage a sales-tax specialist to negotiate a Voluntary Disclosure Agreement (VDA) with the state. VDAs typically:
Cap look-back to 3–4 years (vs unlimited for unregistered seller)
Waive or reduce penalties
May reduce interest
Anonymous initial approach via specialist allowed in most states
⚠️ Stop and engage a CPA / sales-tax specialist before registering retroactively in any state.
Output: Nexus exposure report
SALES-TAX NEXUS EXPOSURE REPORT Jurisdiction: US
──────────────────────────────────────────────────────────────────
Seller: [Legal entity]
Period: [12-month look-back end date]
As-of: YYYY-MM-DD
State Gross Sales Tx Count Marketplace Threshold Status Action
──────────────────────────────────────────────────────────────────
CA $612,000 4,200 $410,000 $500,000 ⚠ NEXUS Register + collect (direct sales $202K still > some local triggers; verify)
TX $310,000 1,850 $0 $500,000 ✅ Below Monitor monthly
NY $115,000 720 $30,000 $500,000 ✅ Below Monitor monthly
FL $98,000 540 $0 $100,000 ⚠ Watch Approaching - register if exceeded
WA $45,000 310 $40,000 $100,000 ✅ Below Monitor; marketplace sales count toward threshold
... (every state with sales presence) ...
──────────────────────────────────────────────────────────────────
TOTAL $X,XXX,XXX
PRIORITY ACTIONS
1. CA - Register; collect tax on direct-channel sales going forward.
2. FL - Monitor; approaching threshold within 60–90 days.
3. Run VDA evaluation for any state where threshold was crossed historically.
──────────────────────────────────────────────────────────────────
International note
For UK / EU / CA / AU sellers or sellers shipping into those jurisdictions, see finance-invoice per-jurisdiction VAT / GST blocks. EU OSS (One-Stop-Shop) for B2C, IOSS for low-value imports, UK VAT registration thresholds, CA GST/HST/QST, and AU GST all have separate nexus / registration logic.
Workflow
Collect 12-month sales by state, transaction count, marketplace vs direct.
Match each state to current threshold (re-verify with state DOR).
Flag states where nexus is established or approaching.
For nexus states: build registration + filing checklist.
For historical exposure: route to VDA evaluation.
Output nexus exposure report with disclaimer footer.
Templates and analytical tools only - not personalized sales-tax, financial, or legal advice. Generated [DATE]. Jurisdiction: US (and per-state). State sales-tax thresholds, marketplace-facilitator rules, exemption-certificate formats, and product taxability change frequently - re-verify against each state's Department of Revenue for your filing year. Voluntary Disclosure Agreements should be evaluated before registering retroactively in any state. Review with a qualified sales-tax specialist or CPA before relying on outputs. Wayland and the plugin authors disclaim all liability for use of these templates.