In California, the sales tax is going up by 1 percent on April 1st. To change your sales tax in POS V6 and above, go to the Edit menu, choose preference and then company. In your company preferences, select the sales tax section and then click on the edit button on the relevant sales tax. Click through till you get to the rate and change it. Since you can't schedule the change, you will need to do this after you close the 31st.