INDIVIDUAL MCP TOOL

cis_nil_return_check

Says whether a contractor must file a CIS nil return for a tax month (SI 2005/2045 reg 4(9A) and (9B), inserted by SI 2026/289 from 6 April 2026): due when a mainstream contractor that has paid subcontractors before pays none that month, unless it told HMRC no later than 14 days before the month started.

0sand1s.co.uknone authenticationAvailability not checked

LIVE ENDPOINT

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

No auth detected

Connect to this endpoint to inspect the live schema for cis_nil_return_check and invoke it with your own arguments.

Indexed input schema

{}

Risk classification

Inferred read-only · medium confidence · heuristic, not a guarantee.

No write-capable action terms were found; this is not proof that invocation has no side effects.

Parent server

0sand1s.co.uk

CONNECT WITH APPROVAL

Client installation

Review this server and its permissions before adding it. Secret placeholders must be set locally.

Codex

~/.codex/config.toml

[mcp_servers.0s-and-1s]
url = "https://0sand1s.co.uk/mcp"
enabled = true

Claude Code

.mcp.json

{
  "mcpServers": {
    "0s-and-1s": {
      "type": "http",
      "url": "https://0sand1s.co.uk/mcp"
    }
  }
}

Claude Desktop

Settings → Connectors → Add custom connector

Name: 0s-and-1s
Remote MCP URL: https://0sand1s.co.uk/mcp

Add this remote URL as a custom connector in Claude Desktop. Availability depends on the user plan and workspace policy.

Cursor

.cursor/mcp.json

{
  "mcpServers": {
    "0s-and-1s": {
      "url": "https://0sand1s.co.uk/mcp"
    }
  }
}

Visual Studio Code

.vscode/mcp.json

Add to Visual Studio Code

{
  "servers": {
    "0s-and-1s": {
      "type": "http",
      "url": "https://0sand1s.co.uk/mcp"
    }
  }
}

Generic MCP

Client-specific MCP configuration

{
  "name": "0s-and-1s",
  "transport": "streamable-http",
  "url": "https://0sand1s.co.uk/mcp"
}

MCP Inspector

Run the official MCP Inspector locally and enter the indexed Streamable HTTP endpoint.

Related tools

cis_deduction — Works out the CIS deduction on a payment to a subcontractor, from the gross bill to the net payment.
cis_gross_up — Finds the gross amount (excluding VAT) that leaves a given net payment after the CIS deduction, for a subcontractor quoted a take-home figure.
cis_tax_month — For a date, gives the CIS tax month it falls in (the 6th to the 5th), the tax year, the date the monthly return (CIS300) is due (the 19th, also the date for paying HMRC by any means other than electronically), and the date for paying HMRC electronically (the 22nd, moved back to the banking day before when the 22nd is a weekend or an England and Wales bank holiday).
cis_late_penalties — Works out the late filing penalties on one monthly CIS return under Finance Act 2009 Schedule 55: £100 the day after the 19th, £200 at 2 months, then the greater of £300 and 5% of the deductions at 6 and at 12 months (5% alone for a first return).
cis_gross_payment_turnover_test — Checks the turnover test for CIS gross payment status (Finance Act 2004 Schedule 11, SI 2005/2045 reg 28): £30,000 net construction turnover for a sole trader; for a partnership or company, the lower of £30,000 for each partner or relevant person and £100,000.
cis_needs_verification — Says whether a contractor must verify a subcontractor with HMRC before paying them (SI 2005/2045 reg 6): not needed if the subcontractor was on one of this contractor's CIS returns, or was verified by this contractor, in the tax year of the payment or the two before.