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Monthly CIS Returns

CIS300 prepared, filed and reconciled—on time, every month

NZTWorx prepares and files your monthly CIS300, aligning deductions made to subcontractors with HMRC rules. We reconcile labour vs materials, verify rates, and produce a clean liability figure so you know exactly what to pay and when.

Returns are submitted ahead of the deadline, with confirmation and a payment summary. We also handle nil returns, amendments, and any discrepancy resolution, keeping finance and site teams in sync and your scheme compliant.

For electronic payments, we’ll flag the payable amount and due dates: file by the 19th of the following month, and pay by the 22nd.

Key benefits

  • Accurate CIS300 preparation with verified rates and clean labour/material splits

  • Deadline control—filed by the 19th with payment guidance for the 22nd (electronic)

  • Nil returns and amendments handled, with audit-ready records

  • Discrepancy resolution when figures don’t match prior periods or verifications

  • Seamless link to weekly CIS payroll and deduction statements

What’s included

CIS300 Preparation & Filing

Monthly return compiled from approved payroll data; filed to HMRC with submission receipt retained.

Liability Reconciliation

Labour vs materials review; rate checks; month-on-month comparisons to catch anomalies before filing.

Nil Returns & Amendments

Submission of nil returns when no CIS paid; post-filing corrections handled promptly.

Payment Guidance

Clear “amount to pay” with deadlines (19th/22nd) and references to use when paying HMRC.

Statements & YTD

Contractor and subcontractor summaries updated; year-to-date totals for finance and project leads.

Reporting & Audit

Submission receipts, change logs and exports, ready for audit and month-end packs.

How it works

  1. Receive approved weekly CIS payroll data (including verified rates and materials splits).

  2. Reconcile totals, investigate anomalies, and prepare the draft CIS300 for sign-off.

  3. Submit the CIS300 to HMRC and retain submission confirmation.

  4. Issue a payment summary with amounts, references and the 19th/22nd deadlines.

  5. Handle any amendments and update statements and YTD reports.

Compliance & risk reduction

Late or inaccurate CIS300 filings can trigger penalties and rework. Our process locks in verified rates, accurate labour/material treatment and timely submissions, with full evidence retained for audit.

You’ll receive submission receipts, liability breakdowns and clear payment instructions—so month-end is predictable.

What we need to start

  • Your contractor details and CIS scheme status

  • Approved weekly CIS payroll data (labour/materials, verified rates)

  • Any changes or corrections to prior periods (if applicable)

  • Payment contact for HMRC remittances and approvals

Who it’s for

Contractors and agencies operating a CIS scheme who want dependable monthly filings, clean reconciliations and a clear view of liabilities and statements.

Get Started

FAQs

  • The CIS300 must be filed by the 19th of the following month. If paying electronically, the payment is due by the 22nd.

  • Yes. If no CIS payments were made in the period, we’ll file a nil return and keep your scheme up to date.

  • We’ll process an amendment and update your statements and audit log accordingly.

  • Absolutely. We build the CIS300 from your approved weekly CIS payroll so figures match and month-end is smooth.