Self Assessment (MTD)
This API is monolithic and is in the process of being broken down to more granular APIs.
Only taxpayers subscribed to Making Tax Digital for Business for tax years 2017/18 onwards can use the API.
As part of the subscription process, the user supplies HMRC with the following information:
- the name of their business
- their accounting period
- whether they use cash or accruals accounting
The sandbox endpoint is
Self Assessment (MTD) documentation