---
title: "Arc & Ledger Tax Data API"
account: arcandledger
slug: arc-ledger-tax-data-api
---

# Arc & Ledger Tax Data API

U.S. tax reference: federal tax parameters, filing deadlines, IRC 6621 interest rates, and IRS notice and form profiles

- Operations: 11
- Versions: 1 (latest `d435ea185ef3`)
- Source: https://api.arcandledger.com/v1/openapi.json
- OpenAPI document: https://skmtc.dev/arcandledger/apis/arc-ledger-tax-data-api/revisions/d435ea185ef3?raw

## Operations

11 in total, by tag:

- Other (11)

Every operation, with a link to its markdown: https://skmtc.dev/arcandledger/apis/arc-ledger-tax-data-api/llms.txt