How to submit tax returns when working abroad?

I have been submitting a tax return every year for a few years now. I plan to go overseas and work/travel. How would I complete future tax returns? I want to avoid penalties for non-submission, but am unsure how to complete the return if I am not earning income in South Africa.

How much time each year will you be gone from South Africa?

12 months. possibly longer.

All you need to then is file a nil return. You would just click you have been unemployed and file like that.