Go to Tax -> Tax Code Maintenance

Here to Add the Tax Code
For Sales add as SR9 and make sure the rate is 9%

For Purchase add as TX9 and make sure the rate is 9%

On 01Jan2024
Change the Default Tax in Tax code

In Debtor Maintenance
Update 1 by 1 customer in this tax code

**Same Step in Creditor Side**
After done when user create the invoice then will auto show out the new tax code
