Sales Tax Rate in Client Name/Address section

I don't know about other states, but WA State has the craziest tax rate where one city could have 2-3 different tax rates depending on location. It's SO easy to forget to change this at the time of invoicing or even remember which tax code is correct. So it would be extremely helpful if that tax rate for a particular client could be assigned in the client info section and invoicing and quotes would automatically pull that tax rate!