NDIS Invoicing Guide for Sole Trader Support Workers

Understanding NDIS line item numbers

Every NDIS-funded support has a unique line item number from the NDIS Support Catalogue (formerly the Price Guide). These numbers identify exactly what service you provided and at what rate. Using the wrong line item is the most common reason invoices get rejected. Line items follow a structured format — for example, core supports for assistance with daily life fall under category 01, and each specific service type has its own sub-item number. Always cross-reference the current NDIS Support Catalogue before invoicing, as item numbers and maximum rates are updated at least annually (typically on 1 July).

• •Download the latest NDIS Support Catalogue from the NDIS website — don't rely on outdated copies
• •Match the line item to the exact service you delivered, not the closest approximation
• •Check that your rate does not exceed the published maximum for that line item
• •Include the full line item number on every invoice line — partial numbers are often rejected
• •If you provide multiple support types in a single visit, itemise each one separately with its own line item

Invoicing plan managers vs the NDIA directly

How you submit your invoice depends on how the participant's plan is managed. Plan-managed participants have a plan manager who handles payments on their behalf — you invoice the plan manager directly. Self-managed participants pay you directly and claim reimbursement from the NDIA. NDIA-managed participants require you to be a registered NDIS provider, and you submit claims through the NDIS myplace portal. Each path has different requirements.

• •Plan managers: Send your invoice via email (or their preferred portal). Include the participant's name, NDIS number, date of service, line item number, hours or units, rate, and total. Most plan managers pay within 5–14 business days.
• •Self-managed: Invoice the participant directly. They pay you and claim reimbursement from the NDIA. You do NOT need to be a registered provider for self-managed participants.
• •NDIA-managed: You must be a registered NDIS provider. Submit claims through the myplace provider portal. Payment is typically within 2–5 business days once approved.

Service agreements — why they matter

A service agreement is a written agreement between you and the participant (or their nominee) that outlines the supports you will provide, the price, cancellation terms, and how you'll handle changes. While not always legally required, having a signed service agreement protects both parties and prevents disputes about what was agreed. Plan managers often request a copy before processing your first invoice. Key elements to include are the supports being provided, the line item numbers and rates, the schedule of services, your cancellation policy (aligned with the NDIS cancellation rules), and how invoicing and payment will work.

Common invoice rejection reasons and how to avoid them

Rejected invoices delay your cash flow and create administrative headaches. Here are the most common reasons invoices are knocked back.

• •Wrong or outdated line item number — always use the current NDIS Support Catalogue
• •Rate exceeds the NDIS price limit for that line item
• •Missing participant NDIS number or incorrect spelling of their name
• •Invoice date doesn't match the service delivery date
• •Claiming for a support that isn't funded in the participant's plan
• •No service agreement on file with the plan manager
• •Travel claimed incorrectly — e.g. claiming travel to the first participant of the day, which is not claimable
• •GST charged when you're not registered for GST (sole traders under the $75,000 threshold are usually not registered)
• •Invoice format missing required details — always include your ABN, business name, and a unique invoice number

Payment timelines and cash flow tips

Cash flow is a common challenge for NDIS sole traders. NDIA-managed claims are the fastest (2–5 business days once submitted). Plan managers vary — some pay within a week, others take up to 30 days. Self-managed participants pay you directly, so timing depends on the individual. To manage cash flow effectively, invoice immediately after each service rather than batching at month-end. Follow up on unpaid invoices after 14 days. Keep a spreadsheet or use invoicing software to track what's been submitted, what's been paid, and what's outstanding. And maintain a cash reserve of at least 4–6 weeks of expenses to buffer against slow payments.