Trip Primarily for Business
You can deduct all of your travel expenses if your trip was entirely business related. If your trip was primarily for business and, while at your business destination, you extended your stay for a vacation, made a personal side trip, or had other personal activities, you can deduct only your business-related travel expenses. These expenses include the travel costs of getting to and from your business destination and any business-related expenses at your business destination.
Example.
You work in Atlanta and take a business trip to New Orleans in May. Your business travel totals 900 miles round trip. On your way home, you stop in Mobile to visit your parents. You spend $2,165 for the 9 days you are away from home for travel, non-entertainment-related meals, lodging, and other travel expenses. If you hadn’t stopped in Mobile, you would have been gone only 6 days, and your total cost would have been $1,633.50. You can deduct $1,633.50 for your trip, including the cost of round-trip transportation to and from New Orleans. The deduction for your non-entertainment related meals is subject to the 50% limit on meals mentioned earlier.
Trip Primarily for Personal Reasons
If your trip was primarily for personal reasons, such as a vacation, the entire cost of the trip is a nondeductible personal expense. However, you can deduct any expenses you have while at your destination that are directly related to your business.
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www.irs.gov]
Edit: This doesn't directly answer the OP's question, I realize, but it helps put things in context. Personally, if it were a trip I would plan anyways expecting to make a profit (based on my actual vehicle cost of around 25 cents a mile and not the IRS rate,) I would deduct all the mileage except for personal side trips. If I did not remotely expect to make enough to cover my travel costs, I would only claim the expenses of business side trips (and maybe some of the hotel stays and meals.)
Edited 1 time(s). Last edit at 12/24/2019 07:09PM by mystery2me.