Total Income: R124612.00
Total Expenses: R42345.00
Salaries: R65,000
Balance 21/07/10: R17267
Balance 31/08/10: R2267
At the end of this month, the profit remaining will be R17,267. But R15000 of that will be gone next month to salaries. So if i submit next month and i have only R2267 profit left over, does that mean my tax burden is gone?
Remember this for Small Informal business
I'm generalising here, but your taxable income is small enough that I won't worry too much about it. You obviously have to declare the income/expenses in your personal tax return - for the period from 1 Mar to 28 Feb. Lacking more information, to be safe, I'd provide for 25% of your cumulative profit for the year-to-date for tax (assuming you earn a salary also - if you provide that details it's easier to guess the %).
The situation can obviously change if your income/expenses drastically change during the next few months.
For the 2010 tax return it will obviously only included details from 1 Mar 09 to 28 Feb 10. I can't see from your figures what that profit is.
Alternatively,
Small Business Tax may apply, whereby you pay tax on your turnover. The first R100,000 is exempt and from there progressively more. I don't have much experience with it, so maybe someone else can chime in with more details.
I don't think you qualify for a
Small Business Corporation in terms of the discounted corporate income tax rates that exists (for 2010 in any case).
You probably have to register as an employer too for PAYE purposes. I'm not sure if there are exemptions in the Act.
Sorry, I probably causing more questions than answers.

There are other people here that are able to fill in the blanks.
My advice is always to have a consultation with a tax accountant/consultant - with all the details they'll be able to sort your queries out in no time.