use of tax status in tax determination process

Hi

the actual tax rate is determined by the rule determine tax rate ,so what is the purpose of the rule type determine tax status ?

Suppose the tax determination process finds the tax status as 'XYZ' for a transaction ,but the rule type determines tax rate evaluates rate based on a condition set  which does not have tax status as a determining factor ,so in such case how is tax status impacting the overall tax calculation?