What type of tax category do I fall into?

I have one client in the US, I use all my own equipment and work from home. What type of taxes should I be filing? I am based in South Africa and bring funds through via PayPal, I am not taxed in the US as I am considered a independent contractor.

You're regarded by SARS as a provisional tax payer, kindly read our blog on What is Provisional Tax? How and when?
You're also required to still submit an annual individual tax return, kindly Register for TaxTim and we'll help you submit your tax return to SARS.
Also refer to our Wear and Tear calculator to see if you can claim depreciation on the assets you are using for work.