Adobe is applying the South African Value Added Tax (VAT) on electronic services (e-services) starting in January 2020. This South African tax applies to transactions by companies that supply e-services, including Adobe.
For monthly and annual paid monthly plans, you are billed the VAT starting in January 2020. If you have an existing prepaid annual plan, the VAT goes into effect when your plan renews.
This change does not affect the base price of your Adobe plan.