Hi,
Yes by default Magento offers only one tax class which is Taxable Class. But you can always create a new class as you require.
Following the given steps below to create a new class
1.login as admin
2.store->taxes->tax rules
3.click on add new tax rule button
4.a page to create a new rule is opened. Here you will find a setting namely “Additional setting”.Expand this setting.
5.You can see a label “Product Tax Class” and a button namely “add new tax class” associated with it.Click on this button to create a new tax class.
6.Click on “save rule”. You will notice that the new class you had made is shown on the “Product Tax Class” list.
This was how you can make a new class. Now you can proceed with creating a new tax rule and tax rate.
Now to solve your problem which was to assign different tax rates to different product categories just create a new tax rate and associate this with a new tax rule. Then associate this new tax rule with the newly created tax class.
The next time when you will assign this new tax class to any product you see that different tax rate is changed.
Hope this was helpful
