Basis

AI agents that do real accounting work for firms

Basis is a New York-based AI agent platform built for accounting firms, not for enterprise AP departments — it automates structured accounting workflows across tax, audit, and client accounting services (CAS). Founded in 2023 and backed by Accel, Google Ventures, and others with $137M+ raised (including a Series B in early 2026 valuing it at $1.15B), Basis’s agents ingest structured and unstructured data from client documents, accounting systems, and ERP platforms, then analyze records, extract fields, perform calculations, and apply validation rules — all within firm-specific compliance frameworks. Human accountants remain in a reviewer role rather than a data-entry role. The company states approximately 30% of the Top 25 accounting firms use the platform across CAS, tax, and audit practices.

Compliance

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Key Features

Multi-practice coverage: Agents operate across client accounting services, tax return preparation, audit testing, and advisory workflows within the same platform, rather than requiring separate tools per practice.
Explainable agent outputs: Each agent action surfaces its data sources, assumptions, and confidence level alongside the output — designed for the review-and-sign-off workflow that accounting requires, unlike “black box” automation.
Automated reconciliations and journal entries: Agents prepare bank reconciliations, journal entries, and workpapers as finished drafts ready for accountant review, reducing time spent on data gathering and initial preparation.
Tax return preparation: Automated preparation of tax returns, including document classification, data extraction, and schedule generation, with human review before filing.
Firm-specific adaptation: Agents conform to each firm’s chart of accounts, documentation standards, and client-specific rules rather than applying generic logic.
Integration with existing accounting systems: Connects to existing GL, ERP, and document management systems so agents work within the firm’s current infrastructure.

Use Cases

For accounting firm CAS practices: An accounting firm uses Basis agents to prepare client monthly closes, reconciliations, and financial statements at scale, with accountants reviewing outputs rather than doing the preparation.
For tax season capacity: A firm running out of staff capacity during tax season deploys Basis to prepare routine tax returns, freeing senior staff for review and complex cases.
For audit testing: An audit team uses Basis to automate documentation, workpaper generation, and variance analysis steps, compressing audit preparation time.