What are the entry, re-entry, and reporting requirements for a Non-OA visa holder in Thailand?

Although you don't have to "report" if you leave the country within the 90-day period, you must remember to file a TM30 within 24 hours of your return. If your landlord doesn't do this online, it will require a trip to your local immigration office to do it yourself, which is a "defacto" reporting anyway

once the visa is past its validity date and you are already in the second year, you do not have a multi re-entry any more . . so if you plan to exit and enter again you will need to buy a re-entry permit each time

Another point about 90 days. If you leave before 90 days then when you re-enter the 90 day clock resets and you start again at day 1.

okay, you can never renew a visa so, the answer is after you wring the two years of stay out of this visa you would go back and either get another one from the consulate in Australia,

OR

You would apply for a yearly extension of stay at the immigration office inside the country by meeting the financial requirements in place at the time you apply for it.

The visa is unlimited entry/exit for it's validity (a year from the date it's issued) <-meaning you do NOT need a re-entry permit right now..

One thing, many people get stamped in wrong on an O-A visa. Make sure you get stamped in for a whole year.

A non OA visa gives you multiple entry and a stamp on each entry for 1 year. If you are in Thailand for 90 days then you need to do a report to immigration. You do not have to leave every 90 days. If you leave and come back just before the visa runs out then you will get a 2nd year out of it but you’ll need a reentry permit to keep it active.