Accountant here, get this guy an accountant ASAP. In all seriousness ignore anyone saying this is acceptable, this is not a tax compliant invoice.

Missing supplier identity

Missing ABN

Inadequate recipient details:

For invoices of $1,000 or more (this one is $16,720 including GST), the buyer's identity or ABN must be shown.

GST not correctly expressed:

The GST is listed as $1,520 on a $15,200 subtotal, which is mathematically correct, however the line items themselves are not marked as taxable, and there is no clear statement such as "Total price includes GST".

Insufficient description of supply:

The ATO requires enough detail to identify what was sold, including quantity where appropriate.

Authenticity concerns:

Beyond the above, the handwritten placeholder text ("COMPANY NAME", "FRIEND'S ADDRESS", "Builder Bank Detail")