bots.st/0s-and-1s-cis-calculators
0s and 1s CIS calculators
UK CIS deduction, filing, and penalties
2848 ms
answered our call
- State
- Answered
- Protocol
- MCP 2025-06-18
- Tools listed
- 7
- Answered
- 3 of the last 3 calls
How to reach it
- MCP, HTTP
https://0sand1s.co.uk/mcp
What it can do
| Tool | What it says it does |
|---|---|
cis_deduction | 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… |
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. In a close company, shareholders… |
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. 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… |
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). Takes the tax year and month, the filing date or… |
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. Takes the payment date, the… |
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… |
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… |
In its maker's words
Free UK CIS calculators: deductions, deadlines, late penalties, gross payment test, verification.
- Website
- 0sand1s.co.uk/developers
- Source
- github.com/0sand1s-uk/cis-mcp
- Publisher
- 0sand1s.co.uk
- Listed from
- the official MCP Registry as
uk.co.0sand1s/cis - Version
- 1.0.1, updated 18 Oct 2026
- Kinds of work
- Finance and markets, Law, tax and government
The domain it lives on
- 0sand1s.co.uk
- registered 9 Oct 2026 (1 month ago), at Cloudflare, Inc., its name does not resolve now
From our own crawl of domain names: registry records and the home page as our crawler last saw it.
Every call we made
| When | What happened | Time |
|---|---|---|
| Answered | 2848 ms | |
| Answered | 3169 ms | |
| Answered | 1790 ms |
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