Business Mileage Two Workplaces with one significantly closer to home

Hi -

 

My employer pays an auto allowance and we record mileage based on IRS rules to make the reimbursement tax free. I need documentation to support my reimbursement request. 

 

My “regular” place of work (A) is 50 miles from my home (B). The main office (C) is 5 miles from my home. I typically spend 2 days per week at my regular place of work and the rest of the week at a variety of locations. 

 

As I interpret the IRS rules, travel between workplaces is reimburseable so even though C is located on my way home if I go from A to C during the work day that mileage is reimburseable.

 

I often go to the main office for meetings and then go home from there. I do not claim mileage from C to B, only the miles from A to C. 

 

Similarly, I will sometimes pick up materials at C first thing in the morning and then go to A (my regular place of work). As I understand it, that mileage is then also reimburseable since I started that workday at a different work place and it is once again mileage between work places.