Sphere helps automate registration, calculation, filing, and remittance obligations for companies.

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Sphere raised $21M Series A led by a16z for its AI-powered tax compliance platform that automates registration, calculation, filing, and remittance across 100+ global tax jurisdictions. The company pivoted from an ed-tech marketplace after founder Nicholas Rudder experienced tax compliance challenges firsthand. Sphere uses TRAM, an AI model that codifies tax rules and creates determinations with human review, then applies them through a non-AI tax engine to eliminate hallucinations. The platform integrates with billing systems like Stripe and targets Series B to IPO stage companies with global operations, including clients like Replit and ElevenLabs.

a16z leads $21M Series A into AI-native tax compliance software Sphere