Server data from the Official MCP Registry
Free UK CIS calculators: deductions, deadlines, late penalties, gross payment test, verification.
About
Free UK CIS calculators: deductions, deadlines, late penalties, gross payment test, verification.
Remote endpoints: streamable-http: https://0sand1s.co.uk/mcp
Security Report
Valid MCP server (1 strong, 1 medium validity signals). No known CVEs in dependencies. Imported from the Official MCP Registry.
7 tools verified · Open access · No issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Found in Source Code
Found by scanning the linked source code. This listing connects to a hosted endpoint, so none of this runs on your machine: it describes what the server software does where it is hosted.
How to Connect
Remote Plugin
No local installation needed. Your AI client connects to the remote endpoint directly.
Add this to your MCP configuration to connect:
{
"mcpServers": {
"uk-co-0sand1s-cis": {
"url": "https://0sand1s.co.uk/mcp"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
0s and 1s CIS MCP server
Free calculators for the UK Construction Industry Scheme (CIS), as a remote MCP server and a JSON API. For contractors who pay subcontractors, and the bookkeepers who do it for them.
- MCP server:
https://0sand1s.co.uk/mcp(Streamable HTTP, no sign-in) - REST API:
https://0sand1s.co.uk/api/v1(OpenAPI) - Docs: https://0sand1s.co.uk/developers
No key and no account. Nothing you send is stored. Up to 60 requests a minute from one address, the API and the MCP server together.
Tools
| Tool | What it works out |
|---|---|
cis_deduction | The CIS deduction on a payment: gross, VAT and materials in, deduction and net out, with the working |
cis_gross_up | The gross to pay so the subcontractor receives a given net |
cis_tax_month | The tax month a date falls in, the return due date (19th) and the electronic payment date (22nd, moved for weekends and bank holidays) |
cis_late_penalties | What a late CIS300 or nil return costs, stage by stage |
cis_gross_payment_turnover_test | Whether a business meets the turnover test for gross payment status |
cis_needs_verification | Whether a subcontractor must be verified with HMRC before a payment |
cis_nil_return_check | Whether a nil return is due for a tax month |
Money goes in as pounds ("1,200.00") and comes back as pence and pounds. Dates are YYYY-MM-DD. Every answer lists the GOV.UK and legislation.gov.uk pages it follows. Answers follow the published rules; they are not tax advice and do not come from HMRC.
Connect
Claude (claude.ai and the desktop app): Customize, Connectors, Add custom connector, then name it 0s and 1s with the URL https://0sand1s.co.uk/mcp.
Claude Code:
claude mcp add --transport http 0sand1s https://0sand1s.co.uk/mcp
Cursor (~/.cursor/mcp.json):
{ "mcpServers": { "0sand1s": { "url": "https://0sand1s.co.uk/mcp" } } }
VS Code (.vscode/mcp.json):
{ "servers": { "0sand1s": { "type": "http", "url": "https://0sand1s.co.uk/mcp" } } }
Try the API
curl "https://0sand1s.co.uk/api/v1/deduction?gross=1200&vat=200&materials=300&rate=20"
About this repository
This repository holds the listing for the official MCP registry (server.json, name uk.co.0sand1s/cis) and this README. The server is hosted by 0s and 1s, CIS filing software for contractors. Questions: support@0sand1s.co.uk.
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