Fonoa

Tax Compliance Softwarefonoa.com

Fonoa provides an AI-powered, API-first indirect tax operating system — covering tax ID validation, determination, e-invoicing, returns, and DAC7 reporting across 190+ jurisdictions — to global digital-first enterprises, marketplaces, and enterprise tax teams.

Company typePrivate
Founded2019
HeadquartersZagreb, Croatia
Headcount51–100
GTM typeB2B
OfferingSoftware

What Fonoa does

Fonoa is an indirect tax technology company that operates an AI-powered, API-first tax operating system spanning the full indirect tax lifecycle: real-time tax ID validation (Validate), cross-border tax determination (Tax Engine), compliant e-invoicing (E-Invoicing), automated multi-country return filing (Returns), and digital platform data sharing for DAC7/OECD reporting (Data Sharing). The Dublin-headquartered, Croatian-engineered company was founded in 2019 by ex-Uber employees led by founder and CEO Davor Tremac, and serves global digital-first enterprises, marketplaces, SaaS platforms, and enterprise finance/tax teams that must comply with fragmented VAT, GST, sales tax, and e-invoicing mandates across many jurisdictions simultaneously. Its platform combines deterministic tax rule engines with AI intelligence layers (Knowledge for regulatory monitoring, Audit for natural-language data queries, and Agents for autonomous compliance workflows) and is integrated with official government tax databases across 120+ countries; post the 2026 acquisition of PwC's Indirect Tax Edge and the 2024 acquisition of PwC UK's GITC product, Fonoa's combined platform supports tax determination in 190+ jurisdictions and processes over 1 billion transactions annually.

The company generates revenue primarily through recurring subscription fees for its paid services, billed annually with auto-renewal, supplemented by usage-based pricing for high-volume capabilities such as e-invoicing and tax determinations, and a marketplace-sponsored channel in which platforms (e.g., Booking.com, Glovo) pay Fonoa on behalf of their sellers. Fonoa sells predominantly via direct enterprise sales with a Head of Strategic Partnerships and dedicated account management, complemented by a self-serve/PLG motion through public developer documentation at docs.fonoa.com. Backed by Coatue, Dawn Capital, Index Ventures, Headline, Eurazeo, Forestay Capital, and OMERS across approximately $195M of total funding (most recently a $110M Series C in May 2026), Fonoa serves anchor enterprise customers including Uber, Zoom, Booking.com, Netflix, Remote, Intuit, Squarespace, Glovo, and Dell, with offices in Dublin, Zagreb, London, Bucharest, and Amsterdam and reported 100% customer retention in 2025.

Fonoa firmographics

Firmographics

Name: Fonoa
Legal name: Fonoa Technologies Limited
Website: https://fonoa.com
Company type: Private
Founded year: 2019
Operating status: Operating
Headcount range: 51–100 employees
Short description: Fonoa provides an AI-powered, API-first indirect tax operating system — covering tax ID validation, determination, e-invoicing, returns, and DAC7 reporting across 190+ jurisdictions — to global digital-first enterprises, marketplaces, and enterprise tax teams.
Ownership category
akta.pro rank

Fonoa industry classification

Industry

Product category: Tax Compliance Software
NAICS: Accounting, Tax Preparation, Bookkeeping, and Payroll Services (54121), Other Accounting Services (541219)
akta.pro industry: PRIMARYBPAHABAJ
Indirect Tax (VAT/GST/Sales & Use) Services
Business & Public Services/Professional Services (Legal, Accounting, Consulting)/Accounting, Audit & Tax Services
SECONDARYBPAIADAO
Revenue Systems, E-Filing & Digital Tax Administration
Business & Public Services/Public Sector & Government Administration/Tax, Revenue & Customs Administration
SECONDARYBPAIADAC
Tax Return Filing, Processing & Assessment
Business & Public Services/Public Sector & Government Administration/Tax, Revenue & Customs Administration
SECONDARYBPAIADAH
Excise, VAT/Sales Tax & Indirect Tax Administration
Business & Public Services/Public Sector & Government Administration/Tax, Revenue & Customs Administration
SECONDARYBPAAAGAI
Tax Operations Support (Indirect Tax, Withholding, Compliance Admin)
Business & Public Services/Administrative & Support Services (BPO, Call Centers, Back Office)/Finance & Accounting Outsourcing (AP/AR, GL, Billing)
SECONDARYFSAGAJAJ
Tax Compliance, Filing & VAT/GST Automation (SME)
Financial & Insurance/Financial Technology (Fintech)/B2B Fintech (SME Finance, Invoicing, Expense & Spend Management)

Keywords

Indirect tax automation
Tax compliance software
E-invoicing API
VAT GST calculation
Digital platform reporting

Where Fonoa is headquartered

Location

Headquarters

HQ city: Zagreb
HQ country: Croatia
HQ region: Europe

Offices5 records

Markets served

Fonoa business model

Business model

GTM type: B2B
Offering type: Software
Cost components: Technology or R&D, Personnel, Marketing or Sales, Operations, Infrastructure

Revenue model

Subscription / Platform Fees (Paid Services): Fonoa charges customers recurring Subscription Fees for its Additional Services / Paid Services, billed per Subscription Period (typically annual). Auto-billing against customer credit cards is the standard collection mechanism, with the right to increase fees on 30 days' prior notice.
Usage / Transaction-Based Billing: Some Services are priced based on usage / number of transactions processed (e.g., e-invoicing volumes, tax determinations, validations) rather than fixed seat-based pricing, consistent with API-first pricing common in tax tech.
Platform-Paid / Marketplace-Sponsored Access: For some Sellers, the Platform (e.g., a marketplace) accepts responsibility to pay Fonoa on their behalf, making the Services free to the end Seller. Fonoa reserves the right to charge the Seller directly if Platform payment fails or if the Seller stops transacting through the Platform.

Pricing tiers

Model	Billing	Price
Subscription	Annual	Paid Services / Additional Services — subscription-priced, no public tier list
Usage-based	Pay-as-you-go	Usage / transaction-based elements (e.g., tax determinations, e-invoicing volumes)

Go-to-market motion1 record

Distribution channels4 records

Marketing channels9 records

Fonoa product offering

Product offering

Core offering

Fonoa operates an AI-powered, API-first indirect tax operating system for global enterprises. It automates tax ID validation, real-time VAT/GST/sales tax determination, certified e-invoicing, multi-country tax return filing, and digital platform seller reporting (DAC7/OECD) across 190+ jurisdictions. The platform serves digital-first businesses such as marketplaces, SaaS, mobility, streaming, and travel platforms that must comply with fragmented cross-border indirect tax mandates.

Product overview

Fonoa offers a unified AI-powered tax operating system for global indirect tax, structured as a single platform with modular products covering the full indirect tax lifecycle: Validate (tax ID validation), Tax Engine (determination), E-Invoicing, Returns (filing), Data Sharing (DAC7/digital platform reporting), Knowledge and Audit (intelligence layer), and the upcoming Agents module for AI-driven compliance automation. The platform integrates upstream capabilities (tax determination, e-invoicing) with downstream compliance and filing via the 2026 acquisition of PwC's Indirect Tax Edge and the 2024 acquisition of PwC UK's GITC product, creating a single data model across every jurisdiction (tax determination in 190+ countries, tax ID validation in 100+ countries, over a billion transactions processed annually).

Differentiator

Problem solved

Functional benefit

Products and services

Validate
Tax Engine
E-Invoicing
Returns
Knowledge
Audit
Data Sharing
Global Indirect Tax Compliance (GITC)
Indirect Tax Edge

Companies that use Fonoa

Customer profile

Named customers21 records

Segments5 records

Ideal customer profiles4 records

Fonoa technology and API

Technology

Technology focussed Yes

API detail

Has API: Yes
API docs
API detail

Core technology

AI maturity

App detail

AI capability8 records

Feature9 records

Fonoa partnerships and signals

Strategic signal

Partnerships

Two partnerships are on record, tiered flagship and minor.

PwC (PricewaterhouseCoopers)flagshipStrategic or Co-development PartnerPwC UK divested its Global Indirect Tax Compliance (GITC) product to Fonoa in October 2024, serving 40+ clients in financial services. In May 2026, PwC also divested its Indirect Tax Edge (Edge) indirect tax compliance platform to Fonoa; Fonoa is integrating Edge with its modular tax infrastructure to create a unified platform covering the full indirect tax lifecycle for global businesses.
Mitto (SYNAPSE Sponsor)minorGTM or Marketing PartnerMitto is referenced as a sponsor of Fonoa's SYNAPSE San Francisco workshop event on May 12, 2026, alongside other named and unnamed Diamond and Platinum Partners.

Scale indicators11 records

Recent moves6 records

Expansion highlights7 records

Fonoa competitors and assessment

Company assessment

Direct peers

Avalara: Avalara is the largest publicly traded indirect tax compliance platform, offering tax determination, e-invoicing, returns, and validation across 190+ countries — the most direct head-to-head competitor to Fonoa's full-lifecycle stack. Like Fonoa, Avalara is API-first and serves global digital enterprises, though it is significantly larger and broader in SMB reach.
Sovos: Sovos is a global tax compliance platform with leading e-invoicing and VAT compliance capabilities, deeply embedded in enterprise and government-mandate workflows. Fonoa and Sovos overlap directly on unified e-invoicing (Fonoa's 150+ country coverage mirrors Sovos's global mandate coverage) and indirect tax determination for multinationals.
Vertex, Inc. Vertex provides indirect tax determination and compliance software (Vertex O Series) used by large enterprises, historically strong in ERP-integrated sales/use tax. Fonoa competes most directly with Vertex on tax engine capabilities and configurable rule logic for global VAT/GST/sales tax determination.
Taxamo: Taxamo specializes in VAT/GST compliance and merchant-of-record services for the digital economy, including marketplaces, SaaS, and streaming — the same core ICP as Fonoa. Both companies were founded to serve digital-first cross-border businesses with automated indirect tax compliance.
Marosa: Marosa is an EU-headquartered VAT compliance and e-invoicing platform focused on cross-border B2B transactions, with deep coverage of EU mandates. It is directly comparable to Fonoa's e-invoicing and tax ID validation modules for European enterprise customers.

Emerging players

TaxJar (Stripe): TaxJar, acquired by Stripe in 2021, focuses on US sales tax automation for SMB and mid-market e-commerce. While more US-centric and SMB-focused than Fonoa, it competes in tax determination, filing, and validation and increasingly intersects via Stripe Tax for global merchants.
Quaderno: Quaderno provides automated sales tax, VAT, and GST calculation and filing for SaaS and digital businesses, often serving SMB and mid-market segments. It overlaps with Fonoa's core tax determination and validation capabilities for digital-first customers, though with a narrower geographic footprint and lower enterprise orientation.

Broad incumbents

Stripe Tax: Stripe Tax embeds indirect tax calculation directly into the Stripe payments platform, serving hundreds of thousands of merchants globally. While not API-symmetric to Fonoa's enterprise stack, it competes at the developer/platform layer for the same cross-border digital merchant use case.
Thomson Reuters ONESOURCE Indirect Tax: Thomson Reuters ONESOURCE is an enterprise indirect tax determination and compliance suite used by large multinationals, often integrated with ERP systems. Fonoa competes with ONESOURCE on enterprise VAT/GST/sales tax determination and global compliance reporting for multinational customers.
Wolters Kluwer (Indirect Tax / CCH): Wolters Kluwer offers enterprise tax compliance and e-invoicing solutions (including Teammate, CCH Integrator, and indirect tax offerings) serving large corporates and accounting firms. It competes with Fonoa on enterprise indirect tax compliance and country-specific mandate coverage.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights8 records

Customer concentration

Fonoa compliance and trust

Trust signal

Compliance2 records

Fonoa financial estimates

Financial estimate

Revenue estimate

Valuation estimate

Fonoa leadership team

Management profile

Number of profiles

Profiles17 records

Fonoa funding detail

Funding detail

Funding overview

Funding rounds4 records

Investors13 records

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

Fonoa M&A and investment

M&A and investment

M&A2 records

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Fonoa

What does Fonoa do?

Is Fonoa a public or private company?

Fonoa is a private company. It is classified as venture growth investor backed and is currently operating.

When was Fonoa founded?

Fonoa was founded in 2019. It employs 51 to 100 people.

Where is Fonoa based?

Fonoa is headquartered in Zagreb, Croatia, in the Europe region.

How does Fonoa make money?

Three revenue lines are on record. Subscription / Platform Fees (Paid Services) is the primary driver. The others are usage / Transaction-Based Billing and platform-Paid / Marketplace-Sponsored Access.

Who are Fonoa's main competitors?

Direct peers on record are Avalara, Sovos, Vertex, Inc., Taxamo and Marosa. Emerging players are TaxJar (Stripe) and Quaderno. Broad incumbents are Stripe Tax, Thomson Reuters ONESOURCE Indirect Tax and Wolters Kluwer (Indirect Tax / CCH).

Does Fonoa have an API?

Yes. Fonoa offers an API-first platform for indirect tax compliance. The platform exposes APIs across its modules including Validate (tax ID validation in 120+ countries), Tax Engine (VAT, GST, Sales Tax determination across 100+ jurisdictions, sub-200ms response), E-Invoicing (unified e-invoicing API with accredited government connections), Returns, Data Sharing (DAC7 reporting), and Agent endpoints (coming soon). The API is documented publicly at docs.fonoa.com and is designed to be configurable without engineering escalation. Authentication, rate limits, and sandbox availability are not explicitly detailed in the source. Developer documentation is at docs.fonoa.com/reference/welcome-to-fonoa.

What industry is Fonoa in?

Fonoa's product category is Tax Compliance Software. Its primary akta.pro industry code is BPAHABAJ, Indirect Tax (VAT/GST/Sales & Use) Services, with a secondary code of BPAIADAO, Revenue Systems, E-Filing & Digital Tax Administration. Its NAICS code is 54121.