Is a BC obliged to send levy accounts to owners every month?

Technically, nothing in the STSM Act states that the Body Corporate (mostly through the Managing Agent) must send monthly levy accounts / statements to owners.

The only reference to this in the STSM Act is the following:

Section 3

(5) The body corporate must, annually or whenever there is a change in levy, certify in writing—

• the amount determined as the contribution of each owner;
• the manner in which such contribution is payable; and
• the extent to which such contribution has been paid by each owner.

And then also this – what we call the Levy circular within 14 days after the AGM

PMR 25.(1)The body corporate must, as soon as possible but not later than 14 days after the approval of the budgets referred to in rule 17(6)(j)(iv) by a general meeting, give each member written notice of the contributions and charges due and payable by that member to the body corporate, which notice must‑

• state that the member has an obligation to pay the specified contributions and charges; and
• specify the due date for each payment; and
• if applicable, state that interest at a rate specified in the notice will be payable on any overdue contributions and charges; and
• include details of the dispute resolution process that applies in respect of disputed contributions and charges.

So even though there is no legal obligation on the Body Corporate to send monthly levy accounts / statements, this is a practical arrangement that the Managing Agents assist with.  It also serves as a reminder to owners that they need to pay the Body Corporate, and where there are utility recoveries done on the account, they can see what those amounts are month to month.