Yes, the prn hourly rate and the travel contract rate are about equal if you negotiate appropriately. However, as a
traveler greater than 50 miles from your tax home, you get to consider 40% of what you make as non-taxable. So for easy numbers, lets use 100k/ year. But 40k is not taxed. If you assume a 33% tax on that 40k that would be $13,200 that you get to keep. But you will have expenses when you travel. And you have to prove that you pay at least a rent at your tax home and your travel location. But there is no sent amount that is considered rent.