Providing the Tax File Numbers (TFNs) for associate individuals and/or organisations of the company currently applying for an ABN is a way to expedite the process, however the ABR does not require the TFN’s to validate a person’s identity. In some circumstances, their address will suffice if it is the same address currently listed on their TFN documents. In our experience however, if an associate individual or organisation does not provide their TFN, or their details don’t match TFN documents, we have found that an ABN will either be refused at the time of submitting the application or the company can face delays in obtaining their ABN - sometimes up to 28 days. It is for this reason, while it is not mandatory, we do strongly suggest providing the TFNs.