US Sales & Use Tax Rates API - State, County, City, and District Rate Lookup

API Overview

This API returns current sales and use tax rate information for any US jurisdiction. Submit a full street address for the most accurate rate assignment, or pass a ZIP code, city, or state for broader lookups. The API intelligently classifies your input, resolves it to the correct taxing jurisdiction, and returns a complete rate breakdown — state rate, county rate, city rate, and voter-approved special district add-ons — alongside the combined effective rate. Tax engines, ecommerce platforms, billing systems, accounting software, and travel-and-expense tools use this data to calculate destination-based tax on invoices, orders, and reimbursements.

Full Rate Decomposition

Every response breaks the combined rate into its component layers — state, county, city, and special district — so callers can apply the right portion to the right tax account and reconcile to filing-form line items.

Flexible Lookup Input

Accepts full street addresses, ZIP codes, cities, or state names. The response includes a LookupType field so callers can see how their input was classified and verify that the correct jurisdiction was resolved.

Honest About ZIP Ambiguity

A single ZIP code can span multiple tax jurisdictions and tax boundaries do not follow ZIP boundaries. The API returns the predominant jurisdiction for ZIP lookups and flags this explicitly, so you know when to prompt for a full address.

Premium API

This is a premium API that uses advanced AI analysis across state departments of revenue, local tax authority publications, and official taxing body disclosures to provide comprehensive sales and use tax rate breakdowns for any US jurisdiction.

25 credits per API call

Sample Results

Field	Example Value	Description
`Jurisdiction`	Los Angeles, Los Angeles County, CA	The specific taxing locality the combined rate applies to
`JurisdictionLevel`	City	Granularity of the resolved jurisdiction (Address / ZIP / City / County / State)
`LookupType`	Address	How the API classified the caller's input (Address / ZIP / City / State / Ambiguous)
`State`	California	Full state name
`County`	Los Angeles County	County name, or "Not applicable" for state-level lookups
`City`	Los Angeles	City name, or "Not applicable" for state/county-level lookups
`StateRate`	6.00%	State sales tax rate, or "No state sales tax" for OR/MT/NH/DE/AK
`CountyRate`	0.25%	County-level sales tax component
`CityRate`	0.75%	City-level sales tax component
`DistrictSpecialRate`	2.50%	Combined voter-approved transit, stadium, school, or other local add-ons
`CombinedRate`	9.50%	Sum of all applicable components — the effective rate to apply
`RateEffectiveDate`	Q4 2024	Best-known effective date of the quoted rates
`TaxAuthorityReferenceURL`	https://www.cdtfa.ca.gov/taxes-and-fees/sales-use-tax-rates.htm	URL of the authoritative state department of revenue page for verification

API Details

Endpoint

https://api.interzoid.com/getsalesusetaxrates

Request Format

https://api.interzoid.com/getsalesusetaxrates?license=[licensekey]&lookup=[address, ZIP code, city, or state]

Sample Request

https://api.interzoid.com/getsalesusetaxrates?license=fh5hs7*****&lookup=1234 Rodeo Drive, Beverly Hills, CA 90210

Sample Response

{ "Jurisdiction": "Beverly Hills, Los Angeles County, CA", "JurisdictionLevel": "Address", "LookupType": "Address", "State": "California", "County": "Los Angeles County", "City": "Beverly Hills", "StateRate": "6.00%", "CountyRate": "0.25%", "CityRate": "0.75%", "DistrictSpecialRate": "2.25%", "CombinedRate": "9.25%", "RateEffectiveDate": "Q4 2024", "TaxAuthorityReferenceURL": "https://www.cdtfa.ca.gov/taxes-and-fees/sales-use-tax-rates.htm", "Code": "Success", "Credits": "20220031" }

cURL Example (with API key in header)

curl --header "x-api-key: fh5hs7*****" "https://api.interzoid.com/getsalesusetaxrates?lookup=Beverly+Hills,+CA"

Additional Examples

Here are additional real-world examples showing how the API handles different input granularity, no-sales-tax states, Alaska's local-only regime, and state-level lookups:

ZIP Code Lookup (Predominant Jurisdiction) ZIP

{ "Jurisdiction": "Predominant jurisdiction in ZIP 10001: New York, NY (Manhattan)", "JurisdictionLevel": "ZIP", "LookupType": "ZIP", "State": "New York", "County": "New York County", "City": "New York", "StateRate": "4.00%", "CountyRate": "Not applicable", "CityRate": "4.50%", "DistrictSpecialRate": "0.375% (MCTD)", "CombinedRate": "8.875%", "RateEffectiveDate": "Q4 2024", "TaxAuthorityReferenceURL": "https://www.tax.ny.gov/pubs_and_bulls/publications/sales_publications/pub718-R.htm", "Code": "Success", "Credits": "20220006" }

No-Sales-Tax State State

{ "Jurisdiction": "State of Oregon", "JurisdictionLevel": "State", "LookupType": "State", "State": "Oregon", "County": "Not applicable", "City": "Not applicable", "StateRate": "No state sales tax", "CountyRate": "Not applicable", "CityRate": "Not applicable", "DistrictSpecialRate": "None on record", "CombinedRate": "0.00%", "RateEffectiveDate": "Ongoing — Oregon does not impose a general sales tax", "TaxAuthorityReferenceURL": "https://www.oregon.gov/dor/programs/businesses/Pages/sales-tax.aspx", "Code": "Success", "Credits": "20219981" }

Alaska (No State Rate, Local Rates Apply) Special Case

{ "Jurisdiction": "Anchorage, Anchorage Municipality, AK", "JurisdictionLevel": "City", "LookupType": "City", "State": "Alaska", "County": "Anchorage Municipality", "City": "Anchorage", "StateRate": "No state sales tax", "CountyRate": "Not applicable", "CityRate": "0.00% (Anchorage does not levy general sales tax)", "DistrictSpecialRate": "None on record", "CombinedRate": "0.00%", "RateEffectiveDate": "Ongoing — Alaska has no state sales tax; some Alaska boroughs and cities levy local sales tax but Anchorage does not", "TaxAuthorityReferenceURL": "https://www.muni.org/Departments/finance/treasury/Pages/default.aspx", "Code": "Success", "Credits": "20219956" }

State-Level Lookup (Texas) State

{ "Jurisdiction": "State of Texas (state rate only — local rates vary by locality)", "JurisdictionLevel": "State", "LookupType": "State", "State": "Texas", "County": "Not applicable", "City": "Not applicable", "StateRate": "6.25%", "CountyRate": "Not applicable", "CityRate": "Not applicable", "DistrictSpecialRate": "Not applicable at state level (local jurisdictions may add up to 2.00%)", "CombinedRate": "6.25% (state rate only; combined rates of 7.25%-8.25% are typical with local add-ons)", "RateEffectiveDate": "Q4 2024", "TaxAuthorityReferenceURL": "https://comptroller.texas.gov/taxes/sales/", "Code": "Success", "Credits": "20219931" }

These examples demonstrate the API's honest handling of real-world tax-rate ambiguity. ZIP-only lookups explicitly note the predominant-jurisdiction caveat; no-tax states return "No state sales tax" rather than fabricating a rate; Alaska's unusual local-only regime is correctly represented; and state-level lookups surface the state rate while noting that local add-ons will apply at lower granularity. Tax engines and billing systems depend on this consistency to build reliable rate decisioning.

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