For the last 5 years I've been designating my business mileage on my vehicles based on an estimate of the percentage of miles which are business versus personal. I did a little tracking for a few weeks to make sure my estimate was based on actual experience, but after that I have just used my percentage. I think at the time I was told it would be an O.K. way to do it (although the IRS would prefer a log book).
Anyway, I've since switched accountants and my new guy believes if I were audited that I would lose the mileage deduction.
I KNOW most people aren't actually filling out a little log book each time they run a business related errand. Is there an accepted practice that doesn't involve the log book?
B.T.W. - with my main work van, I'm going to switch it to "actual expenses" versus mileage so I can avoid the log book on that particular vehicle because it's 100% business. But, I have three other vehicles that are used for a combination of business and personal.
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