In addition to the great answers in Comments, this may be a help:
If you maintain an approved office at home as your principle work location, all your miles are
typically deductible from your "office" to any place business
related.
If you work or operate your
business from somewhere other than your home, even with a home office, you can't deduct the miles you
drive from home to that location. They are commuting miles and therefore, not
deductible. Of course, as mentioned, you can deduct driving costs from your business location
to the bank, a client's office, etc.
