Backed by Y Combinator

Tax Infrastructure to Help You Grow

Everything you need to build, file, and scale tax applications through a single API.

API for Taxes

Submit structured tax data and receive a completed return as JSON, PDF, or IRS MeF XML.

Your Product. Our Tax Engine. Service your clients by building accounting workflows, or AI agents, without building the tax engine yourself.

Infrastructure

Built on the Rails the IRS Already Runs On

No reverse-engineered schemas. No guessing what the IRS will accept.

Every identical input produces the identical return. Deterministic math guarantees which one you get.

Trust & Compliance

Built for How Tax Data Should Be Handled

No Model Training on Your Documents

We contractually guarantee that client documents and return data are never used to train underlying models, protecting client confidentiality and firm liability.

Encrypted End to End

Every document and return is encrypted in transit and at rest. Client data never sits unprotected at any stage of the workflow.

Compliance Commitments

Aligned to IRS security standards, with additional documentation available on request. Currently in the process of acquiring SOC 2 Type II certification.

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