Good news: no. Centrelink doesn't count NDIS funding as income, so getting an NDIS plan won't reduce payments like the Disability Support Pension or JobSeeker. NDIS funding is also tax-free and doesn't affect Child Support assessments.
There's one exception to know about: Mobility Allowance stops once you have an NDIS plan, because transport support moves into your plan instead. If that applies to you, make sure transport funding is discussed at your planning meeting.
You can double-check the details on the Services Australia website, or if you're a Provider Choice customer, ask our Gurus. We're happy to help you make sense of how it all fits together. Book a session here.