Sales-tax, VAT and indirect-tax engines that platforms embed to calculate, file and remit tax for their customers — Avalara, Vertex, Anrok, TaxJar, Stripe Tax, Sovos, Fonoa and the newer AI-native entrants. A vendor is counted only when a buyer discloses it. Tax vendors are not counted as buyers of their own competitors, and a company's own in-house tax product is excluded as self-operated.
Indirect tax rules change by country, state and product, and a business selling online can owe tax in many places at once. Tax engines keep that rulebook current and return the tax due for each line item at checkout or invoicing.
Platforms embed a tax engine so their merchants, sellers or customers stay compliant automatically. The more complete offerings also register the business, file returns and remit what is owed.
Long-established indirect-tax platforms covering calculation, exemption certificates and filing across many jurisdictions. Most-named in the Index: Avalara, Vertex and Sovos.
Tax calculation and filing built for online businesses, SaaS and marketplaces, often bundled with payments. Most-named in the Index: Stripe Tax, TaxJar, Anrok, Kintsugi and Fonoa.
Providers that let a fintech offer personal income tax filing inside its app. Most-named in the Index: Column Tax.
Embedded tax is sales tax, VAT or GST compliance built into another company's software, so its customers get the right tax calculated on each transaction and returns filed without a separate tool. A tax engine supplies the rates, rules and filings through an API.
By number of companies linked to them through public disclosures and provider customer lists, the most-named embedded tax providers are Avalara (17), Vertex (8), Stripe Tax (4), Anrok (4) and TaxJar (3) (Embedded Finance Index, November 2026).
Tax calculation works out the tax due on each transaction. Tax compliance also covers registering in each jurisdiction, filing returns and remitting the tax collected. Some providers do only the first; others handle the whole process.
The Embedded Finance Index analyzes the public infrastructure stacks of 6,605 fintech and embedded-finance companies. A provider is counted when a company names it in its own disclosures — terms, partner pages, press releases — or when the provider publicly lists that company as a customer. Counts are relationships, not revenue or volume.