In the U.S., the IRS collects all federal taxes and deposits them in the Treasury. The President submits a proposed annual budget and Congress spends entirely too much time appropriating the money from the Treasury to fund those parts of the budget it approves. There is no way to know what your tax dollars went to specifically because they go into a comingled fund that pays for all federal appropriations.

What national government anywhere in the world specifies the federal programs paid for by taxes on an employee pay stub?