UK Business Calendar

UK working days, bank holidays, invoice due dates, payroll days and HMRC / Companies House deadlines — for your AI agent.

For bookkeepers, accountants, payroll, small businesses and agent builders. Free: next bank holidays. Subscribers get working-day maths, due dates, monthly planners and tax/filing deadlines.

Tools

• next_bank_holidays (free) — FREE. Next 3 UK bank holidays for a nation, plus whether today is a working day.
• working_days (Pro) — PRO. Count UK working days between two dates (excludes weekends + bank holidays for the nation).
• due_date (Pro) — PRO. Invoice/contract due date: add N working days or N calendar days (rolled to next working day) to a date. Includes Late Payment Act 30-day default.
• tax_deadlines (Pro) — PRO. Upcoming HMRC and Companies House deadlines for the next N months; add company_year_end for Corporation Tax, CT600 and accounts dates.
• month_planner (Pro) — PRO. For a month: working days count, bank holidays, payday suggestions (last working day / 25th rolled back) and deadlines.

Live free example

next_bank_holidays {"region":"england"}

{
  "region": "england-and-wales",
  "today": "2026-10-14",
  "today_is_working_day": true,
  "next_3": [
    {
      "title": "Christmas Day",
      "date": "2026-12-25",
      "notes": "",
      "bunting": true
    },
    {
      "title": "Boxing Day",
      "date": "2026-12-28",
      "notes": "Substitute day",
      "bunting": true
    },
    {
      "title": "New Year’s Day",
      "date": "2027-01-01",
      "notes": "",
      "bunting": true
    }
  ],
  "pro": "Working-day maths for invoices & contracts, payment due dates, HMRC & Companies House deadlines: https://uk-business-calendar-mcp.donniertf.workers.dev/buy",
  "disclaimer": "Deadlines are standard rules; your own dates can differ (e.g. VAT stagger, first accounts, extensions). Check GOV.UK/HMRC. Not tax advice."
}

Connect (MCP)

Add https://uk-business-calendar-mcp.donniertf.workers.dev/mcp to Claude, Cursor or any MCP client (Streamable HTTP, no login for the free tier). Subscribers pass access_token or Authorization: Bearer.

Important

Deadlines are standard rules; your own dates can differ (e.g. VAT stagger, first accounts, extensions). Check GOV.UK/HMRC. Not tax advice.

Data sources & licences

• GOV.UK bank holidays API (England & Wales, Scotland, Northern Ireland) — OGL v3.0
• HMRC / Companies House published filing and payment deadlines (rules encoded)

For AI agents

llms.txt · server card · pricing.json · POST /checkout → checkout URL · GET /token?session_id= → access token.

More UK data MCPs

See the whole fleet (Companies House, Land Registry, planning, tenders and more), plus the £1.99 / £3.99 pack bundles: bundles · GitHub hub.

Contact & cancelling

Questions, refunds or cancelling: dmorrisonwebdesign@gmail.com. Run by Donnie Morrison, UK. Payments by Stripe; we never see card details.