Best indirect tax software
Seven sales tax, VAT and GST vendors with an Accountio profile, side by side.
Listed alphabetically. Accountio does not rank vendors, and a featured listing does not change the order.
Indirect tax software tracks where a business owes sales tax, VAT or GST, registers it, calculates the tax and files the returns. The seven vendors here range from Avalara, with 41,000+ customers, to newer platforms for software and cross-border sellers such as Anrok, Fonoa, Kintsugi, Numeral, Sphere and Zamp. The main differences are which countries they cover and how much of the work they do for you.
Indirect tax software at a glance
| Vendor | Best for | Founded and HQ | Customers | Pricing |
|---|---|---|---|---|
 Anrok | Software, AI and ecommerce companies, from founders and early teams to enterprise scale | Not published | Thousands of companies, including Notion, Webflow and Synthesia; US$100bn+ in transactions processed | Starter US$100 per market a month; Custom priced on transaction volume |
 Avalara | Small, midsize and enterprise businesses, including software companies, retailers and manufacturers | 2004; Durham, North Carolina, US | 41,000+ customers; 6.6 million+ returns filed in 2025 | From US$69 per state a month for businesses under US$50m revenue; larger businesses quoted on volume |
 Fonoa | Global businesses with digital and cross-border business models, including marketplaces | Dublin, Ireland (registered office); founding year not published | Canva, Uber, Netflix and Booking.com; e-invoicing for 1M+ marketplace sellers | Not published |
 Kintsugi | Ecommerce, SaaS and finance teams | San Francisco, US; founding year not published | 7,000+ businesses | Free exposure monitoring; Starter from US$75 per filing or registration; Premium custom with volume discounts; month to month, no transaction fees |
 Numeral | Ecommerce brands, venture-backed startups, software companies, and distribution and manufacturing businesses | 2022; San Francisco, US | 3,500+ customers; Brex, Fishwife and Character.ai quoted on the site | Free nexus monitoring; Professional US$75 per filing and US$150 per state registration, month to month; Enterprise custom |
 Sphere | Companies selling across borders, typically US$10m+ ARR with multiple entities | Not published | ElevenLabs, Replit, Lovable, Deel, Ramp and others | Starter US$100 per region a month (under 10 regions); Growth (10+ regions) custom |
 Zamp | Growing small to mid-size digital businesses, plus accounting firms on a referral or white-label basis | Founding year not published; Miami, Florida, US | 1,200+ finance and accounting teams and over 120 accounting firms | Free plan for nexus and exposure assessment; paid plans scoped per customer, no per-transaction fees |
The seven vendors
In alphabetical order. “Not published” means the vendor does not state it.
Anrok
Best for: Software, AI and ecommerce companies, from founders and early teams to enterprise scale
Sales tax and VAT/GST compliance from exposure monitoring to registration, calculation, filing, remittance and reconciliation, plus e-invoicing and exemption certificates, with AI tax intelligence (Anrok Atlas).
- Founded and HQ
- Not published
- Ownership
- US$100m+ raised; CEO Brad Silicani
- Customers
- Thousands of companies, including Notion, Webflow and Synthesia; US$100bn+ in transactions processed
- Pricing
- Starter US$100 per market a month; Custom priced on transaction volume
- How it runs
- US sales tax in 11,000+ jurisdictions; VAT and GST in 150+ countries
Avalara
Best for: Small, midsize and enterprise businesses, including software companies, retailers and manufacturers
Tax compliance: sales and use tax calculation, returns filing and remittance, VAT, e-invoicing, exemption certificates, cross-border duties, business licences and property tax, with AI agents.
- Founded and HQ
- 2004; Durham, North Carolina, US
- Ownership
- Not published
- Customers
- 41,000+ customers; 6.6 million+ returns filed in 2025
- Pricing
- From US$69 per state a month for businesses under US$50m revenue; larger businesses quoted on volume
- How it runs
- Customers in 75+ countries; VAT, GST, e-invoicing and duties across 190+ markets; offices in the US, Europe, India and Brazil
Fonoa
Best for: Global businesses with digital and cross-border business models, including marketplaces
Indirect tax platform: tax ID validation, VAT, GST and sales tax calculation, e-invoicing and returns, plus tax law monitoring and tax data audit tools; AI agents coming soon.
- Founded and HQ
- Dublin, Ireland (registered office); founding year not published
- Ownership
- Venture-backed; US$110m Series C (May 2026) led by Headline
- Customers
- Canva, Uber, Netflix and Booking.com; e-invoicing for 1M+ marketplace sellers
- Pricing
- Not published
- How it runs
- Tax determination in 190+ jurisdictions; tax ID validation in 100+ countries; e-invoicing across 150+ countries
Kintsugi
Best for: Ecommerce, SaaS and finance teams
Sales tax, VAT and GST compliance: exposure (nexus) monitoring, registrations, filing and remittance, exemption certificates and back filing, with an AI assistant (Kin).
- Founded and HQ
- San Francisco, US; founding year not published
- Ownership
- Not published
- Customers
- 7,000+ businesses
- Pricing
- Free exposure monitoring; Starter from US$75 per filing or registration; Premium custom with volume discounts; month to month, no transaction fees
- How it runs
- US sales tax on every plan; Canada, the EU, the UK and 100+ countries on Premium
Numeral
Best for: Ecommerce brands, venture-backed startups, software companies, and distribution and manufacturing businesses
Sales tax, VAT and GST compliance done for the customer: nexus monitoring, registrations, tax calculation, filings and remittance, exemption certificates and tax notice handling, with human support.
- Founded and HQ
- 2022; San Francisco, US
- Ownership
- Venture-backed; US$100m Series C (Sep 2026) led by Insight Partners with Salesforce Ventures; US$157m raised in total
- Customers
- 3,500+ customers; Brex, Fishwife and Character.ai quoted on the site
- Pricing
- Free nexus monitoring; Professional US$75 per filing and US$150 per state registration, month to month; Enterprise custom
- How it runs
- All US states and jurisdictions; sales tax, VAT and GST in 90+ countries on Enterprise
- Good to know
- Numeral pays penalties and interest if a filing is late
Sphere
Best for: Companies selling across borders, typically US$10m+ ARR with multiple entities
AI-native cross-border indirect tax compliance: sales tax, VAT and GST monitoring, registration, calculation, filing and remittance across 130+ jurisdictions.
- Founded and HQ
- Not published
- Ownership
- Private; Series A US$21m led by Andreessen Horowitz with Y Combinator and Felicis (Nov 2025); 20VC also listed as a backer
- Customers
- ElevenLabs, Replit, Lovable, Deel, Ramp and others
- Pricing
- Starter US$100 per region a month (under 10 regions); Growth (10+ regions) custom
- How it runs
- Cloud platform; 130+ jurisdictions worldwide (US states, Canada, EU, UK, Australia, India and more), with direct connections to tax authorities
- Good to know
- Files through direct connections to tax authorities; tax experts approve each AI determination
Zamp
Best for: Growing small to mid-size digital businesses, plus accounting firms on a referral or white-label basis
Managed sales tax compliance: software plus tax specialists handling nexus tracking, registrations, rooftop-level calculation, filing, remittance and notices.
- Founded and HQ
- Founding year not published; Miami, Florida, US
- Ownership
- Private; US$30m raised in total, latest round led by Acrew Capital with Thomson Reuters Ventures (announced Apr 2026)
- Customers
- 1,200+ finance and accounting teams and over 120 accounting firms
- Pricing
- Free plan for nexus and exposure assessment; paid plans scoped per customer, no per-transaction fees
- How it runs
- Software plus managed service; US (13,000+ jurisdictions) and Canada
- Good to know
- Zamp pays penalties or interest caused by a Zamp-managed calculation or filing
Related tools in the same directory category
Embedded tax for financial apps and AI accounting operations, in the same directory category.
How to choose indirect tax software
- Which taxes do you need covered: US sales tax, VAT and GST, e-invoicing mandates, or corporate and direct tax?Kintsugi, Numeral and Zamp start from US sales tax; Zamp also covers Canada, and Kintsugi and Numeral add VAT and GST on their top plans. Anrok, Avalara, Fonoa and Sphere cover sales tax, VAT and GST across many countries, and Anrok, Avalara and Fonoa add e-invoicing.
- Do you want software that calculates and files, or a managed service that also handles registrations and notices?Numeral and Zamp do the compliance for you, including registrations and tax notices. Sphere files through direct connections to tax authorities, with tax experts approving each determination. Anrok, Avalara, Fonoa and Kintsugi are sold as software platforms.
- How is it priced: by transactions, by filings, by jurisdictions, or a flat fee?Kintsugi and Numeral charge US$75 per filing. Avalara starts at US$69 per state a month for smaller businesses, Anrok at US$100 per market a month and Sphere at US$100 per region a month. Zamp has a free plan and scopes paid plans per customer. Fonoa does not publish prices.
Compare further
Common questions
What is indirect tax software?+
Software that works out where a business owes sales tax, VAT or GST, registers it, calculates the tax on each transaction, and files and pays the returns. Some products also handle e-invoicing and exemption certificates.
Can AI handle indirect tax compliance?+
Partly. Anrok has Anrok Atlas for tax intelligence, Kintsugi an AI assistant called Kin, and Avalara AI agents. Sphere's TRAM model researches tax rules, with tax experts approving each determination. Numeral and Zamp pair software with human specialists.
Which indirect tax software covers VAT outside the US?+
Avalara covers VAT, GST, e-invoicing and duties across 190+ markets, Fonoa tax determination in 190+ jurisdictions, Anrok VAT and GST in 150+ countries and Sphere 130+ jurisdictions. Numeral covers 90+ countries and Kintsugi 100+ countries on their top plans. Zamp covers the US and Canada.
Part of Accountio’s accounting technology coverage.
