How do I install 0s And 1s CIS Calculators?

Copy the http config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.

Does 0s And 1s CIS Calculators need an API key?

No required environment variable is listed on this record.

What transport does 0s And 1s CIS Calculators use?

0s And 1s CIS Calculators is reached over HTTP.

When was 0s And 1s CIS Calculators last checked?

Last checked 2026-11-10. Free UK CIS calculators: deductions, deadlines, late penalties, gross payment test, verification.

0s And 1s CIS Calculators MCP server

Power your agent

Add this server

The publisher's own URL. Not a PlugMCP endpoint.

Add to Cursor Add in Claude Add to VS Code Run on PlugMCP

Host a copy with our keys and logs.

Server URL

https://0sand1s.co.uk/mcp

The Claude button above opens Claude with the name and URL filled in. You still confirm it there.

shClaude Code

1claude mcp add --transport http uk.co.0sand1s-cis https://0sand1s.co.uk/mcp

Run in a terminal.

jsonClaude Desktop

1{2  "mcpServers": {3    "uk.co.0sand1s-cis": {4      "command": "npx",5      "args": [6        "-y",7        "mcp-remote",8        "https://0sand1s.co.uk/mcp"9      ]10    }11  }12}

claude_desktop_config.json

Remote · HTTPPublisher installStep-by-step: add this in Claude

Remote URL or a command on your machine? How the two installs differ

Run on PlugMCP

Host a copy with our keys and logs.

A new server you create. It is not this listing's official endpoint. Use the publisher install when you want their URL and their credentials.

Launch

Server facts

Remote

Transport: http
Version: 1.0.1
Last checked

Tools

No tool list yet. Remote servers get one after the first health check.

FAQ

Questions

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: [email protected].

Add this server

Host a copy with our keys and logs.

Server facts

Tools

Questions

How do I install 0s And 1s CIS Calculators?

Does 0s And 1s CIS Calculators need an API key?

What transport does 0s And 1s CIS Calculators use?

When was 0s And 1s CIS Calculators last checked?

Documentation

0s and 1s CIS MCP server

Tools

Connect

Try the API

About this repository