Upon receiving your Australian Business Number (ABN), you are technically able to commence trading immediately. This instant ability to operate is a significant advantage, as it allows for a swift transition into business activities. However, it's important to note that while you can start trading right away, the Australian Business Register (ABR) may take up to 24 hours to update its system with your new ABN details.
During this period, businesses and individuals you interact with might wish to verify the active and legitimate status of your ABN through the ABN Lookup, an online register hosted by the ABR. It's only after the ABR's system reflects your ABN that external verification can confirm the legitimacy of your registration.
Therefore, while immediate trading is possible, ensuring that your ABN details are visible and verifiable may influence the practical start time for your business dealings. It's also crucial to keep your ABN details up-to-date to maintain the trust and confidence of those you do business with.