Finance Sales Tax

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.

Required inputs

• Seller details: legal entity, primary state, EIN
• Sales channel mix: direct (own website), marketplace (Amazon / Etsy / eBay / Walmart), wholesale, in-person
• 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)

⚠️ 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)

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:

• Register for sales tax permit (apply at state revenue / DOR website)
• Determine filing frequency (monthly / quarterly / annually - typically based on volume)
• Set up tax-collection in cart / POS (right rate by destination ZIP, including local / district / special)
• Calendar filing deadlines (typically 20th of following month, but varies)
• Track gross sales, taxable sales, exempt sales separately per state
• Track local / district / special-purpose tax allocations within state where required
• File timely (most states impose late penalties + interest even on $0 returns)
• Zero-return obligation - most states require filing a return even if no sales were made in the period
• Update for sourcing rules (destination vs origin) - most states use destination sourcing for remote sellers post-Wayfair
• 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

1. Collect 12-month sales by state, transaction count, marketplace vs direct.
2. Match each state to current threshold (re-verify with state DOR).
3. Flag states where nexus is established or approaching.
4. For nexus states: build registration + filing checklist.
5. For historical exposure: route to VDA evaluation.
6. 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.