1. Click on the Store tab.
2. Click on the Settings button, then click Shipping & Taxes from the dropdown list.
3. Click the Regions / Taxes tab.
4. Click the subregion link under the Subregions heading to edit the subregion's tax rate.
5. Give your subregion a tax rate and a tax name.
6. Repeat step 6 until you have added the taxes to all the subregions you need.
7. Click the Save button.