In South Africa you would need to change the VAT % to 15% on the 1st of April 2018.
Coincidence that it is April Fool's day?
Follow the steps as explained here. If, of course you are using the clever 4POS matrix pricing, that is all you would need to do & then run an update...
If however, you are not.... You would need to change all your pricing manually as you will now be paying 15% of turnover & not the 14% you used to calculate the selling prices....
Take care as it is R1,000 out of every R100,000 that you can lose!