
MainStreet is the #1 Tax Credit Platform that uses an AI-enhanced system to scan businesses for potential savings in minutes. They aim to help small businesses and startups claim R&D tax credits and other savings, such as for educational assistance programs and working condition fringe benefits. Their platform simplifies the complex tax code, making the process effortless for users. MainStreet emphasizes a strong team of experts, including CPAs and tax code specialists, who provide best-in-class support. The company has helped thousands of companies claim over $150M in savings, with an average credit claim of $100K. They offer robust support in case of an audit, covering accountant fees, penalties, or interest due to their errors, up to $1 million. MainStreet also highlights its values of supporting small businesses, moving fast, thinking big, and fostering a positive company culture with comprehensive benefits for its remote-first team.

MainStreet is the #1 Tax Credit Platform that uses an AI-enhanced system to scan businesses for potential savings in minutes. They aim to help small businesses and startups claim R&D tax credits and other savings, such as for educational assistance programs and working condition fringe benefits. Their platform simplifies the complex tax code, making the process effortless for users. MainStreet emphasizes a strong team of experts, including CPAs and tax code specialists, who provide best-in-class support. The company has helped thousands of companies claim over $150M in savings, with an average credit claim of $100K. They offer robust support in case of an audit, covering accountant fees, penalties, or interest due to their errors, up to $1 million. MainStreet also highlights its values of supporting small businesses, moving fast, thinking big, and fostering a positive company culture with comprehensive benefits for its remote-first team.
Product: AI-enhanced platform that scans payroll and accounting systems to find and manage tax credits (notably R&D) for startups and small businesses
Founded: 2019 (San Jose, California)
Funding (reported): Raised roughly $64.7M–$75M in venture capital across multiple rounds
Team: Remote-first with ~60 employees (reported)
Claims helped: Helped thousands of companies claim over $150M in savings (average claim ~$100K)
Small business and startup tax-credit discovery and claims automation (R&D and other employer-related credits/incentives).
2019
Fintech / TaxTech
Series B announced Jan 21, 2022 (amounts partially obfuscated in records)
“Raised venture capital from investors including SignalFire, Gradient Ventures, Sound Ventures, Tusk Venture Partners, SV Angel, Shrug Capital, Moxxie Ventures, and Weekend Fund”