Since you use part of your home for business and you are self-employed, your tax home is your the home where you live.
As long as you keep a record of your mileage on a daily basis, you can deduct all of your miles driven for business purposes. That includes running errands for your clients, visiting them at home or at other places and driving packages to the post office.
If a trip serves more than one business purpose, you will need to assign it to one of your activities, making sure not to take the same miles for two activities.
For example, if you drive from your home to the post office to mail some parts, that part of trip should be assigned to your mailing business. If you then leave the post office and drive to Client A's home, that part of your trip should be assigned to your caregiving business.
The most important part is to keep timely records. Click here to learn more about the requirements.
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