0s and 1s CIS calculators MCP server

• cis_deductionFree

  Works out the CIS deduction on a payment to a subcontractor, from the gross bill to the net payment. Takes the gross including VAT, the VAT, the subcontractor's materials and the rate (0, 20 or 30). VAT is never taxed under CIS and materials come off before the rate applies; the deduction is rounded down to the penny. Returns each step of the working, money in pence and pounds. Does not cover retentions, or decide which rate applies (verify the subcontractor with HMRC for that).

• cis_gross_payment_turnover_testFree

  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. In a close company, shareholders count as well as directors. Returns the figure needed by each route, which one applies, and how far short. Covers the turnover test only, not the business test or the compliance test.

• cis_gross_upFree

  Finds the gross amount (excluding VAT) that leaves a given net payment after the CIS deduction, for a subcontractor quoted a take-home figure. Takes the net, the subcontractor's materials and the rate (0, 20 or 30). Where rounding lets two grosses give the same net, the larger is returned so CIS is never under-deducted. Returns the forward working on that gross, money in pence and pounds. VAT is not included; add it on top if the subcontractor charges it.

• cis_late_penaltiesFree

  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). Takes the tax year and month, the filing date or none, today's date, the deductions and whether a return had been filed before. Returns each penalty with its date and whether it is charged, avoided or still to come. Does not cover deliberate withholding, interest on late payment, or appeals.

• cis_needs_verificationFree

  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. Takes the payment date, the tax years the subcontractor was on a return and the last verification date, all supplied by the caller. Does not contact HMRC or verify anyone, and does not cover group companies or business transfers.

• cis_nil_return_checkFree

  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. Takes the tax year and month and yes or no answers. Returns whether a nil return is due, why, and the date it is due. Does not file anything.

• cis_tax_monthFree

  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). Bank holidays are known to bank_holidays_known_until; after that only weekends move the date.

• –Code scanremote-only server, no package to scann/a
• Live reliabilityremote reachable in 1621ms20/20
• Tool poisoning7 tool descriptions checked15/15
• Auth qualityopen endpoint, read-only tools10/15
• Maintenancelast push 10 days ago15/15
• Maintainer identityendpoint served from the registry-verified namespace domain8/10

Safety score

91/100

higher than 93% of 1,761 Finance servers

Tools

7

the typical Finance server has 8

Tools that change things

0%

typical: 0%. Fewer write tools means less an agent can break

Uptime

100%

of our recent checks; the typical remote Finance server answers 100%

Response time

1,042 ms

faster than 9% of 1,133 Finance servers

0s and 1s CIS calculators: common questions

Is 0s and 1s CIS calculators MCP server safe?

Yes, by our scan: it is graded A (91/100). Read the 0s and 1s CIS calculators safety report

How do I install 0s and 1s CIS calculators?

It runs remotely at 0sand1s.co.uk. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.

Does 0s and 1s CIS calculators need an API key?

Not as far as the registry entry and our scan can tell: no credentials are declared or required.

Is 0s and 1s CIS calculators maintained?

The last commit was 17 days ago (2026-10-18). The latest release is v1.0.1.

Is 0s and 1s CIS calculators up?

100% of our last 28 checks got an answer. We check remote servers about four times a day.

What can I use instead of 0s and 1s CIS calculators?

Servers from other publishers that do the same job: three.ws Agent Payments MCP server, Yolfi Payments MCP server and X402 List MCP server.

How does 0s and 1s CIS calculators compare with other Finance MCP servers?

safety score 91/100 (higher than 93% of 1,761 Finance servers); tools 7 (the typical Finance server has 8); tools that change things 0% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.