Calculating miles for tax purposes

Hi there,

I'm looking at starting this whole amazon flex thing and have a block booked in a few days.

I have been trying to get my head around all the taxes and tracking miles etc.

Say for example I have a depot 20/25 miles from home that I am doing a block from, do I include the 20ish miles to get there and the 20 miles to get back alongside the miles I do during the block. I would assume these still class as business miles and would play a huge part in minimising any tax paid.

I understand that seems a long distance but that is the closest depot to me, and even after fuel I am still making money in my spare time.

Thanks