0S
0s and 1s CIS API
Construction Industry Scheme: calculate deductions, gross-up, tax months, penalties and nil returns
14 operations3 schemas1 revision
Changes
Full historySource
View schema- Spec
- OpenAPI 3.1.0
- Document
- 0sand1s.co.uk · JSON, 31 KB
- Retrieved
- Oct 19, 2026, 18:10 UTC
- Digest
- caf4279c7477
For agents
Every page here has a markdown twin. The overview is one fetch; the llms.txt lists every operation with a link to its own markdown.
curl https://skmtc.dev/0sand1s/apis/0s-and-1s-cis-api.mdcurl https://skmtc.dev/0sand1s/apis/0s-and-1s-cis-api/llms.txt