Have you ever heard or asked one of the following questions?

• Why do I pay more tax than my friend when we received the same salary?
• Why is my tax different this month when I earn the same salary as last month?
• Why does YourTax, SARS tax tables or some other tax calculator show a different tax than what is on my payslip?

This is a bit of a complicated question with various possible answers. We will discuss the most common ones in the next few articles.

The most important fact to remember is that tax is based on a yearly income. All tax paid during the year of assessment, called PAYE (Pay As You Earn), is just contributions to your annual tax liability. In other words, even if your monthly tax is off by a few rand, it is the yearly total that is important.

When employers do their reconciliation at the end of the year, they do their final correction of your tax in the last pay period of the tax year. Some of the methods used are designed to minimise this difference during the last pay period.

Different types of calculation the employer may use.

• Prorated by month vs number of days
• The difference between the average and predictive methods.