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US State Sales Tax

ActiveTaxFREE

What it does

ZIP-level US sales tax calculation with nexus rules and marketplace facilitator laws. Covers all 50 states, 10,000+ local jurisdictions, and special tax districts. Automatically applies product-specific exemptions for groceries, clothing, prescription medicine, and more.

Required Fields for 100% Accuracy

0 required / 6 total

Field	Type	Required	Description	Example
`state`	string	opt	US state code (2-letter)Either state OR zipcode is required. Both gives best accuracy.	`CA`
`zipcode`	string	opt	US ZIP code (5-digit or ZIP+4)ZIP code gives most precise rate including city and special district taxes.	`90210`
`productValue`	number	opt	Product value for tax amount calculation	`100`
`productCategory`	string	opt	Category for exemption checkOptions: groceries, clothing, prescription_medicine, medical_equipment	`clothing`
`sellerState`	string	opt	Seller state for nexus determination	`NY`
`marketplace`	string	opt	Marketplace name for facilitator rules	`Amazon`

Tips for Best Accuracy

✓zipcode gives the most accurate rate — state-level rate can differ by 2-4% from actual
✓productCategory enables automatic exemption checking (e.g., clothing exempt in PA)
✓sellerState determines if economic nexus applies

Common Mistakes

✗Using only state without zipcode — misses county, city, and special district rates
✗Wrong ZIP format — use XXXXX or XXXXX-XXXX only
✗Not providing productCategory — some states exempt groceries, clothing, or medicine

How to use it

Provide location

Include state code and/or ZIP code in your request. ZIP gives the most accurate rate.

Add product details

Set productCategory for automatic exemption checking (e.g., "groceries", "clothing").

Check nexus

Include sellerState to determine if you have nexus (collection obligation) in the buyer's state.

Marketplace rules

Add marketplace field for marketplace facilitator law compliance.

API Reference

POST/api/v1/tax/us-sales-tax

Request

{
  "state": "CA",
  "zipcode": "90210",
  "productValue": 100,
  "productCategory": "clothing"
}

Response

{
  "state": "CA",
  "stateName": "California",
  "zipcode": "90210",
  "combinedRatePercent": 9.5,
  "taxBreakdown": {
    "stateRate": 7.25,
    "countyRate": 1,
    "cityRate": 1.25,
    "specialRate": 0
  },
  "estimatedTax": 9.5,
  "nexus": {
    "hasNexus": true,
    "reason": "economic_nexus"
  }
}

cURL

curl -X POST https://potal.app/api/v1/tax/us-sales-tax \
  -H "X-API-Key: pk_live_your_key" \
  -H "Content-Type: application/json" \
  -d '{"state":"CA","zipcode":"90210","productValue":100}'

Related Features

💰Sub-national Tax

Calculate state, province, and regional tax rates accurately

⚙️Tax Calculation (VAT/GST)

Calculate VAT, GST, and sales tax for 240 countries and territories

💰Tax Exemptions

Manage and apply tax exemption certificates per jurisdiction

⚙️Total Landed Cost

Get the full import cost including duties, taxes, fees, and shipping

⚙️De Minimis Check

Automatically check if shipment value falls below duty-free threshold

Having issues?

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