SIL, SDA and MTA: what the difference actually is

These three acronyms get used as though they were interchangeable, and they are not. They fund different things, they are assessed against different criteria, and they appear in different parts of your plan. Confusing them is the single most common reason a housing request comes back rejected — not because the need was not real, but because it was written against the wrong funding type.

Here is the plain-English version.

The one-line version

If you remember nothing else from this article, remember this: SIL pays people. SDA pays bricks. MTA pays for a gap.

Why they get confused

Because in the most visible cases they arrive together. A participant with very high physical support needs may have SDA funding for an accessible apartment and SIL funding for the staff who support them in it. Seeing the two side by side often enough, people start to assume one implies the other.

It also does not help that all three sit under "Home and Living" in plan documents, or that the sector uses the acronyms constantly without expanding them. If you have ever sat in a planning meeting nodding along while three letters flew past, you are in good company.

What this means for a request

The practical consequence is that evidence for one is not evidence for the other. A functional capacity assessment that establishes you need two-to-one support at night is strong evidence for SIL. It says almost nothing about whether you meet the SDA criteria, which turn on the design of the dwelling and a much higher impairment threshold.

If you are preparing for a planning conversation, it is worth being explicit about which of the three you are asking for and why — our guide on preparing for your NDIS plan review covers how to structure that evidence.

A quick way to check which one you mean

Ask yourself what would happen if the thing you are asking for disappeared:

• No one to help me get through the day → you are talking about SIL.
• Nowhere accessible enough for me to physically live → you are talking about SDA.
• Nowhere to stay for the next few weeks while something is finished → you are talking about MTA.

Where MMT Care fits

We deliver SIL and MTA across NSW, QLD and VIC, with a free Registered Nurse included in every placement. We are not an SDA provider — we are the support in the home, whoever owns the building. That means we can work alongside your existing SDA provider, or in an ordinary rental, without either arrangement getting in the way.

If you are not sure which of the three your situation calls for, that is a completely normal place to start from, and it is a short conversation to work out. Check our current vacancies or send through the details and we will tell you plainly what applies.