Developer programme

File 1099s from your own product.

One REST API for e-filing, recipient statements, IRS acknowledgments and TIN matching. Build against a sandbox that costs nothing, then take your app live.

Join the programme Read the API reference

E-file to the IRS

1099 and 1098 series through IRIS, under our TCC. You never need your own.

Recipient statements

Fetch Copy B as a PDF per filing, per batch or per order — or have us print and mail it.

Acknowledgments

The IRS outcome per filing, with the real rejection codes, by webhook or by receipt.

TIN matching

Check name/TIN pairs against the IRS before you file, so a CP2100 never arrives.

API reference

Every endpoint, with request and response shapes, error types and the sandbox rules you can assert on.

GET /v1/prices

The rate card, and a quote for what your next filing costs.

POST /v1/filings

Intake one JSON form, validate it, and save it as ready to file.

POST /v1/filings/batch

Intake up to 1000 forms, validate them, and save good rows as ready to file.

GET /v1/filings/{id}/ack

The IRS acknowledgment, with rule ids and messages.

GET /v1/filings/{id}/copy-b

The recipient statement, byte-identical to the print centre's.

POST /v1/tin-match

Asynchronous TIN matching; results by webhook or receipt.

GET /v1/payers

The payers a credential can reach, and their recipients.

POST /v1/webhooks

Subscribe to outcomes instead of polling for them.

Programme news

Changes to the API, the filing seasons, and the IRS platforms behind them.

Coming season

Tax year 2026 in the sandbox

TY2026 forms are available to file against the IRS test system now. Production opens once ATS certification completes.

New

Services on every filing

Choose e-file, e-file + print & mail, or print & mail only per form. Checkout files the cart in one owner-signed payment.

New

Batch intake

POST /v1/filings/batch creates ready-to-file forms with our form id and your reference; addToCart can stage successful rows when you want that shortcut.

Start in the sandbox

Joining takes a minute and costs nothing. You get a sandbox company with play money, and nothing you file there reaches the IRS.

Join the developer programme