I already have STP but not sure what I should upgrade to for my accounting software. I am a small ca

Hi Jan,
When you say you have STP already, do you mean you're using our micro-business STP app?

If you're looking for something basic to get started I'd recommend checking out Reckon One which is our low cost cloud accounting service. If you only need payroll & STP then you can have that for just $7 per month (info here - https://www.reckon.com/au/payroll-software/).
Alternatively, if you need more functionality like invoices, bank feeds etc then you can further add to the functionality you need via Reckon One's modules.
Check out more Reckon One info here - https://www.reckon.com/au/accounting-software/

If you have any questions, let us know.