Add tax if shipping OR billing address is in a particular state

Sorry if this has been addressed before, but I could not find anything in a search.

In the store I’m setting up for my client, they’ve asked for a tax (the same tax rate) to be added if an order has a billing OR shipping address in a particular state.

I can’t figure out how to set this up without calculating tax twice for orders billed and shipped within the state.

Any help would be appreciated.


Convinced client that in their situation, they only need to tax based on shipping address.

Just FYI, though, either/or condition configuration is not possible with cs-cart.