Free CIS guides

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• CIS calculator

  Type an invoice. See what to hold back and what to pay.

• CIS300 deadlines

  When each return is due and when HMRC must be paid.

• CIS deduction rates

  The three CIS rates in plain English: who gets 20%, 30% or nothing taken off, and what the rate is taken from. Checked against gov.uk.

• Verify a subcontractor

  When you must verify a subbie for CIS, the details you need, and what HMRC's answer means. Plain English, checked against gov.uk.

• How to pay subcontractors

  Seven plain steps for paying subbies under CIS: register, verify, work out the deduction, pay, give a statement, file the CIS300, pay HMRC.

• Right to work for subcontractors

  Do you need to check a self-employed subbie's right to work? What is changing in 2026, what a check involves, and where to read the official rules.