If you plan on being in the relationship long term then there shouldn't be any issues, however, as you are officially listed as de facto partner you should familiarize yourself with this information should things ever breakdown https://www.amp.com.au/insights-hub/blog/managing-money/de-facto-splits

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If you submit a tax return now you will likely also need to disclose your partner's income and they yours. It's good because if you are on low income then you get joint thresholds, however, it also means you need to tell the partner how much you earn.

There are also implications around private health rebates when you have a defacto partner but check this with your accountant to confirm