Description
Basis is an agentic AI platform purpose-built for CPA firms and accounting teams, deploying autonomous AI agents that handle month-end close, transaction processing, reconciliation, tax preparation, and audit work under accountant supervision. Founded in 2023 and built on OpenAI’s o3, o3-Pro, GPT-4.1, and GPT-5 models, Basis agents operate autonomously rather than just assisting a human accountant, letting firms scale client capacity without proportional headcount growth. The company raised a $100M Series B in February 2026 at a $1.15B valuation, and Chicago-based firm Sikich has integrated Basis to automate client accounting services across month-end closing and reconciliation.
Key Features
- Autonomous agents with human oversight: Agents onboard and execute tasks under direct instruction, with accountants reviewing output.
- Month-end close automation: Handles reconciliations, journal entries, and financial summaries end to end.
- Tax preparation agents: Ingest financial documents, classify transactions, apply tax code rules, and generate filing-ready returns.
- Audit workflow support: Pulls structured and unstructured data from client documents, ledgers, and ERP systems for analysis.
- System integration: Works with existing ledgers and file systems accountants and clients already use, without credential storage.
- Rules-based controls: Combines large language models with accounting logic so each agent follows fixed constraints rather than reasoning freely.
How It Works
An accounting firm directs a team of Basis agents to take on specific workflows, such as reconciliations, journal entries, or tax return preparation, and the agents pull structured and unstructured data directly from client documents, ledgers, and connected ERP systems. Each agent operates within a fixed set of rules-based constraints rather than reasoning freely, combining large language models with accounting logic to keep output predictable and auditable. Agents perform their assigned tasks securely without storing client credentials, generating output that’s ready for accountant review rather than final without oversight. As OpenAI’s underlying models improve, Basis’s agents compound those gains, expanding what they can reliably handle and speeding up the review cycle for the accountants directing them.
Technical Architecture & Overview
- Core Engine: Built on OpenAI’s o3, o3-Pro, GPT-4.1, and GPT-5 models, combined with rules-based accounting logic and controls.
- Deployment: Cloud-based agent platform that integrates with a firm’s existing ledgers, file systems, and ERP connections.
- API Surface: No public self-serve API documented; deployment is handled directly with the Basis team for accounting firms.
- Known Limits: Basis’s more autonomous architecture depends more heavily on AI accuracy and is less flexible for unusual or unprecedented tax situations than assistive-only tools; it serves accounting firms, not businesses directly.
Pros & Cons
| Pros | Cons |
|---|---|
| Autonomous agent architecture lets firms scale client capacity without proportional headcount growth. | No public pricing; every engagement is custom-quoted based on agents, ERP integrations, and volume. |
| Built on frontier OpenAI models (o3, o3-Pro, GPT-4.1, GPT-5), compounding as those models improve. | More autonomous operation depends more heavily on AI accuracy than assistive-only competitor tools. |
| Rules-based controls keep agent behavior constrained and auditable rather than reasoning freely. | Less flexible for unusual or unprecedented tax situations that fall outside standard rules. |
| $1.15B valuation and $100M Series B funding signal strong institutional confidence and staying power. | Built exclusively for accounting firms, not usable by an individual business directly. |
Pricing
| Plan | Price |
|---|---|
| Custom (by number of agents, ERP integrations, and volume) | Sales-led, no public flat rate |
Platform Availability
Web
Best For
Mid-market and large CPA firms wanting autonomous AI agents for close, tax, and audit work | Firms looking to scale client services without proportional headcount growth
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Frequently Asked Questions
Is Basis for businesses or accounting firms?
Basis serves accounting firms rather than businesses directly, equipping CPA firms and accounting teams with AI agents for their client work.
How much does Basis cost?
Basis does not publish flat pricing; cost is custom-quoted based on the number of agents, ERP integrations, and volume, according to independent review coverage of Basis’s official offering.
What AI models power Basis?
Basis is built on OpenAI’s o3, o3-Pro, GPT-4.1, and GPT-5 models, combined with rules-based accounting logic, per OpenAI’s own case study on Basis.
How much funding has Basis raised?
Basis raised a $100M Series B round in February 2026 at a $1.15B valuation, making it the highest-valued pure-play AI accounting startup at that time.
Does Basis require human review of its work?
Yes, Basis agents operate under accountant direction and produce output ready for human review rather than final output without oversight, per Basis’s official positioning.
