What Firstbase.io does

Firstbase.io, Inc. is a US-incorporated SaaS platform that automates company formation and ongoing business operations for startup founders, with a particular focus on international founders incorporating in the United States. Founded in 2018 and headquartered in New York, the company offers a modular product suite built around Firstbase Start (one-time LLC or C-Corp incorporation, EIN setup, registered agent appointment, and post-formation document preparation for $399) and extends it with Firstbase Agent (multi-state registered agent and compliance management at $299/state/year), Firstbase Mailroom (virtual US business address with mail scanning, forwarding, and shredding), Firstbase Loop (one-click integration hub into banking, payments, payroll, and equity partners such as Mercury, Brex, Ramp, Stripe, Deel, and Carta), and Firstbase Accounting, Tax Filing, Sales Tax, Payroll, and Invoices as add-on modules. The Firstbase One bundle ($199/month billed annually) packages Mailroom Premium, Agent Autopilot, Accounting, and Tax Filing at a ~45% discount to standalone pricing. The go-to-market motion is primarily product-led and self-serve, supplemented by a 187-country referral partner network paying 10% commission and a white-label B2B platform (Firstbase for Partners) for law firms, accountants, and bookkeepers. AI is applied in two areas: transaction categorization inside the accounting product and a generative AI business name generator. The company has incorporated more than 30,000 companies across 188-191 countries and reports that its customers have collectively raised $3B in funding. On December 10, 2025, Firstbase.io was acquired by Harbor Compliance, a US compliance support provider seeking to extend its services to more than 200 countries and absorb Firstbase's automation technology stack.

Name

Firstbase.io

Legal name

Firstbase.io, Inc.

Website

https://firstbase.io

Company type

Private

Founded year

2018

Operating status

Acquired

Headcount range

51–100 employees

Short description

Firstbase.io is a SaaS platform that automates US company incorporation and ongoing back-office operations (compliance, registered agent, virtual address, bookkeeping, tax, payroll) primarily for international startup founders, operating across 188+ countries with 30,000+ companies incorporated and was acquired by Harbor Compliance in December 2025.

Ownership category

akta.pro rank

Product category

Business Incorporation and Compliance Software

NAICS

Software Publishers (5132)

SIC

Services-Prepackaged Software (7372)

akta.pro primary industry

Digital Account Opening & Onboarding (eKYC, eSignature, Origination) (FSAGAAAB)

akta.pro secondary industry

Technical & Product Support (Tier 0–2, Troubleshooting) (BPAAABAF)

Keywords

• Company incorporation services
• Compliance management software
• Virtual business address
• Small business bookkeeping
• Startup tax filing

Headquarters

HQ city

New York

HQ country

United States

HQ region

North America

Markets served

GTM type

B2B and B2C

Offering type

Software

Cost components

Personnel, Technology or R&D, Marketing or Sales, Operations, Infrastructure

Revenue model

1. Company Incorporation (Firstbase Start): One-time fee for company formation including LLC or C-Corp incorporation, EIN setup, registered agent services, bank account opening, and legal documents
2. Firstbase One Subscription: Bundled annual subscription combining Mailroom Premium, Agent Autopilot, Accounting, and Tax Filing at a discounted rate ($2,388/year) compared to individual products
3. Agent (Registered Agent & Compliance): Annual subscription per state for registered agent services, compliance reminders, annual reports, and franchise tax filings ($299/year per state)
4. Mailroom (Virtual Business Address): Monthly or annual subscription for physical business address and virtual mailbox services. Basic tier at $35/month or Premium at $50/month
5. Accounting (Bookkeeping): Tiered monthly subscription pricing based on monthly operational expenses ($189-$799/month for ongoing service)
6. Tax Filing: Annual tax filing services for C-Corps and multi-member LLCs at $1,799/year; single-member LLCs at $899/year; includes federal returns, state returns, and 1099s
7. Sales Tax Compliance: Custom pricing for sales tax management including nexus tracking and automated filings for startups and scale-ups
8. Referral Partner Commissions: Referral partners earn 10% commission on customers who use their referral link to incorporate with Firstbase
9. Firstbase for Partners (B2B): White-label platform for professional service firms managing client incorporations with bulk payment and multi-user features

Pricing tiers

Go-to-market motion3 records

Distribution channels5 records

Marketing channels10 records

Core offering

Firstbase.io is an all-in-one startup operating system that automates US company incorporation (LLC and C-Corp) and provides ongoing back-office services including registered agent compliance, a virtual US business address, AI-powered bookkeeping, tax filing, and sales tax compliance. The platform targets founders in 191+ countries and bundles modules such as Firstbase Start (incorporation), Firstbase Agent (compliance), Firstbase Mailroom (virtual address), Firstbase Accounting (bookkeeping), and Firstbase One (annual bundle) under one dashboard. Firstbase also offers a white-label partner platform and an Incorporation API for professional service firms.

Product overview

Firstbase.io is an all-in-one startup operating system built as a platform-plus-modules architecture. The core platform is Firstbase Start, which handles US company incorporation (LLC and C-Corp) with automated paperwork, EIN setup, and post-formation documents. This core is then extended through a suite of integrated modules: Firstbase Agent provides registered agent and multi-state compliance management; Firstbase Mailroom provides a premium physical US business address and virtual mailbox; Firstbase Accounting delivers AI-powered, human-managed bookkeeping with tax-ready financials; Firstbase Tax Filing handles federal and state tax returns; Firstbase Sales Tax automates sales tax compliance; Firstbase Payroll enables compliant payroll across all 50 states; and Firstbase Loop provides one-click access to banking and payments partners. Firstbase One bundles four of these modules (Agent, Mailroom, Accounting, Tax Filing) into a single discounted subscription. Additional tools include free resources (Business Name Generator, VC Database, calculators, guides) and partner platforms (Firstbase for Partners for white-label services, and a Referral Partners program). The platform serves founders in 191+ countries and has incorporated over 30,000 companies.

Differentiator

Problem solved

Functional benefit

Brands

• Firstbase Start: US company incorporation service for LLC and C-Corp formation in Delaware or Wyoming
• Firstbase Agent
• Firstbase Mailroom
• Firstbase Loop
• Firstbase Accounting
• Firstbase Sales Tax
• Firstbase One
• Firstbase for Partners
• Referral Partners
• Firstbase Reports
• Founder's Guide

Products and services

• Firstbase Start Core incorporation platform enabling founders anywhere in the world to form a US LLC or C-Corp in minutes, with automated paperwork, expedited EIN setup, registered agent appointment, bank account opening, and post-formation legal document preparation. Targets US and international startup founders.
• Firstbase Agent All-in-one compliance management platform providing registered agent services, annual report filing, franchise tax filings, foreign qualification, and visual compliance dashboards across all 50 US states. Sold as a $299/year per state subscription.
• Firstbase Mailroom Virtual mailbox and premium physical US business address service enabling founders to receive, scan, digitize, forward, and manage paper mail from anywhere. Basic tier at $35/month; Premium tier with NYC, San Francisco, or Florida addresses at $50/month.
• Firstbase Loop One-click integration platform connecting founders to banking partners (Mercury, Brex, Ramp), payments (Stripe), payroll (Deel, Gusto), and equity management (Carta) with automated application onboarding using existing Firstbase company data.
• Firstbase Accounting AI-powered, human-managed bookkeeping platform delivering tax and investor-ready financial statements with automatic transaction categorization, continuous reconciliation, and live bookkeeper chat. Pricing tiered from $189/month to $799/month based on monthly operational expenses.
• Firstbase Sales Tax End-to-end sales tax compliance platform for SaaS companies that automates nexus tracking, product tax code mapping, sales tax registrations, automated filings, and tax payments across US jurisdictions. Custom pricing for startups (up to $5M ARR) and scale-ups (>$5M ARR).
• Firstbase Tax Filing Full-service US tax preparation and filing for LLCs and C-Corps covering federal Form 1120, state returns, 1099s, and Form 5472 for foreign-owned companies. C-Corp and multi-member LLC filings at $1,799/year; non-US-owned single-member LLCs at $899/year.
• Firstbase One All-in-one bundled subscription combining Agent Autopilot, Mailroom Premium, Accounting, and Tax Filing at $199/month billed annually ($2,388/year), providing 45% discount versus individual products plus $10,000 in DLA Piper legal credits.
• Firstbase Payroll Payroll tax registration and compliant payroll processing service available in all 50 US states, enabling founders to hire remote employees and process payroll with automated tax filings.
• Firstbase Invoices Accounts receivable management tool enabling founders to create, send, and manage invoices directly within the Firstbase platform.
• Firstbase for Partners (F4P) White-label incorporation platform for law firms, bookkeepers, and accounting firms to manage client incorporation workflows with document management, client tracking, notarization, bulk payment, and multi-user account management.
• Referral Partners Program Affiliate and referral partner program enabling influencers, mentors, and partners worldwide to promote Firstbase products through unique referral links and earn 10% commission on referred incorporations with a 90-day cookie window and monthly payouts.
• Firstbase API Public and partner-facing Incorporation API enabling automated US company formation, EIN acquisition, state and federal form submission, and document preparation for integration into third-party platforms.

Quantifiable outcome

• 30,000+ companies incorporated
• +4 more outcomes

Named customers20 records

Segments4 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

Yes

API docs

API detail

Core technology

AI maturity

App detail

Integration8 records

AI capability6 records

Feature5 records

Partnerships

16 partnerships are on record, tiered flagship, core and minor.

• Harbor ComplianceflagshipStrategic or Co-development Partner · 10 December 2025Harbor Compliance acquired Firstbase.io in December 2025. The acquisition enables Harbor Compliance to expand its compliance support for entrepreneurs and international customers, extending services to more than 200 countries while enhancing technological capabilities to support client business growth.
• DLA PipercoreStrategic or Co-development PartnerFirstbase One customers receive $10,000 in legal credits through a partnership with DLA Piper, a leading startup law firm. This partnership provides exclusive access to world-class legal services for incorporated businesses.
• CartacoreGTM or Marketing PartnerIntegration with Carta for equity management. Firstbase customers can create a captable and assign equity using Carta after using Firstbase's post-formation toolkit. 83(B) filings available free through the partnership. Henry Ward, CEO of Carta, has publicly supported Firstbase's mission.
• MercurycoreGTM or Marketing PartnerBanking partner integrated through Firstbase Loop. Customers can apply for Mercury bank accounts through the one-click integration process. Mercury logo appears prominently in partner section.
• BrexcoreGTM or Marketing PartnerBanking partner integrated through Firstbase Loop. Provides automated application process for Brex business accounts with pre-filled information from Firstbase data.
• RampcoreGTM or Marketing PartnerBanking partner integrated through Firstbase Loop platform. Enables quick approval for US bank accounts through Firstbase's banking marketplace.
• DeelcoreGTM or Marketing PartnerPayroll partner integrated through Firstbase Loop. Enables compliant hiring and payroll processing with automated application and pre-filled information.
• Relay FinancialminorGTM or Marketing PartnerBanking partner featured in Mailroom testimonials. Eric Plaskacz, Growth Marketing Manager at Relay Financial, provides testimonial on how Firstbase Mailroom helps international founders get US business addresses for banking.
• AirwallexminorGTM or Marketing PartnerInternational business banking partner featured in Mailroom context. Eric Bai, Strategic Partnerships at Airwallex, provides testimonial on the partnership providing streamlined international business banking services.
• AWS (Amazon Web Services)coreGTM or Marketing PartnerRewards partner offering up to $100,000 in credits or 20-50% off monthly spend through AWS Activate program for startups spending $100+/month.
• StripecoreGTM or Marketing PartnerPayment processing partner with no Stripe processing fee for first $20,000 in transactions offered as a reward. Integrated into Loop platform for payment processing applications.
• GustominorGTM or Marketing PartnerPayroll services partner featured in the rewards ecosystem offering exclusive deals for Firstbase customers.
• HubSpotminorGTM or Marketing PartnerCRM partner offering 90% off Professional and Enterprise plans for 1 year as a reward for Firstbase customers.
• MailchimpminorGTM or Marketing PartnerEmail marketing partner offering 30% off all plans for 12 months as a reward for Firstbase customers.
• ZoomminorGTM or Marketing PartnerCommunication platform partner offering $20 off per user on annual Workplace Pro plans as a reward for Firstbase customers.
• Y CombinatorcoreGTM or Marketing PartnerJared Friedman, Partner at Y Combinator, has publicly endorsed Firstbase stating Y Combinator is thrilled to support Firstbase's mission and believes they will have a massive impact on new businesses being started around the world.

Scale indicators13 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• inDinero: inDinero provides incorporation, bookkeeping, tax, and CFO services to startups and SMBs. Competes with Firstbase One on the bundled back-office offering with a heavier human-services mix.
• Clerky: Clerky specializes in formation and equity management for tech startups and venture-backed C-Corps. Direct competitor to Firstbase Start on the high-quality startup segment, with strong attorney-driven reputation.
• Incfile (now Bizee): Incfile/Bizee offers low-cost LLC and C-Corp formation with registered agent services. Direct competitor to Firstbase Start primarily on price in the mass-market domestic founder segment.
• Northwest Registered Agent: Northwest offers registered agent services and formation across all 50 states with a privacy-focused positioning. Competes directly with Firstbase Agent on the recurring compliance/registered agent product.
• Stripe Atlas: Stripe's company formation product targets the same international founder segment, offering Delaware C-Corp formation, EIN, and integrated Stripe payments. Directly competes with Firstbase Start on price ($500) and banking integration.
• doola: doola offers an all-in-one platform for non-US founders to form US companies with banking, accounting, tax, and compliance services bundled. Closest direct competitor to Firstbase One, targeting the same international founder persona with similar bundled pricing.

Others

• Mercury: Mercury is a banking partner integrated through Firstbase Loop and also competes for the startup founder's onboarding attention with its own streamlined banking application. A key distribution and competitive node for Firstbase.
• Carta: Carta is a core integration partner for cap table and equity management. While not a direct competitor on incorporation, it competes for the post-formation wallet share and is a key partner via the Firstbase Loop ecosystem.

Broad incumbents

• LegalZoom: Public, scaled legal services platform offering incorporation, registered agent, and compliance alongside a much broader legal product portfolio. Competes with Firstbase Start and Agent on price and brand awareness but does not specialize in the international founder niche.
• Harbor Compliance: Harbor Compliance is Firstbase's parent company following the Dec 2025 acquisition. Operates a broader compliance portfolio (registered agent, licensing, BOI reporting) across nonprofits, businesses, and financial institutions, extending Firstbase's reach to 200+ countries.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/tryfirstbase
• YouTubeyoutube.com/c/Firstbase
• LinkedInlinkedin.com/company/firstbase-io
• Instagraminstagram.com/firstbase.io
• Facebookfacebook.com/firstbaseio

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Funding overview

Funding rounds6 records

Investors8 records

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

M&A

Investments

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

Frequently asked questions about Firstbase.io