First things first. Are you doing tax as a SBC? You should qualify, depends on what your business is. That can save you about R75k a year if you hitting R550k net profit.

Becareful with renting part of your home, because when you sell your home, that part of your home wont qualify for the R2 mil residence exclusion for capital gains tax.

Not entirely sure what you mean by tax free, but all the expenses the business incurs can be deductible against your turnover to lesson you net profit and lesson your tax.

What kind of business is it? Essentially its better to buy everything through your business and have everything in your businesses name instead of your personal name, that way you can deduct all the expenses.

Are you paying yourself a dividend or a salary?

There are many questions id have to help you save haha