# IRS Modernized e-File (MeF) API

**Canonical:** https://apis.io/apis/irs/mef/  
**Provider:** IRS — https://apis.io/providers/irs/  
**Base URL:** https://la.www4.irs.gov  
**Documentation:** https://www.irs.gov/e-file-providers/information-and-technical-guidance-for-software-developers-and-transmitters

IRS Modernized e-File (MeF) API is one of 5 APIs that [IRS](https://apis.io/providers/irs/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include E-File, Tax Returns, Electronic Filing, and Software Developers. The published artifact set on APIs.io includes API documentation and a getting-started guide.

Application-to-Application (A2A) system enabling authorized software developers and transmitters to electronically submit tax returns directly to the IRS. Supports individual and business tax forms including Form 2290, Form 720, Form 8849, and more. Requires TLS 1.2 or higher. Technical specifications available in IRS Publication 4164. Current WSDL version is R10.9 for tax year 2025/processing year 2026.

## Machine-readable artifacts (3)

- **Documentation** — https://www.irs.gov/e-file-providers/information-and-technical-guidance-for-software-developers-and-transmitters
- **GettingStarted** — https://www.irs.gov/tax-professionals/get-an-api-client-id
- **StatusPage** — https://www.irs.gov/e-file-providers/modernized-e-file-mef-status

## Other IRS APIs (4)

- [IRS TIN Matching API](https://apis.io/apis/irs/tin-matching/)
- [IRS Income Verification Express Service (IVES) API](https://apis.io/apis/irs/ives/)
- [IRS Information Return Intake System (IRIS) API](https://apis.io/apis/irs/iris/)
- [IRS Transcript Delivery System (TDS) API](https://apis.io/apis/irs/tds/)

## Tags

E-File, Tax Returns, Electronic Filing, Software Developers

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/irs/mef/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/irs/.