If it has a business justification the interest on the debt is deductible.

We bought ours originally for personal pleasure use. We never intended for it to be used for business purposes. But after one year of traveling and seeing all the products we could produce in our factory, including electric power outlets, picnic tables, fire rings, charcoal grilles, etc. we started using the coach to bring us and the displays to trade shows. (www.jamestownadvanced.com) Simultaneous with that I started doing seminars on behalf of a major customer and we used the coach (or my plane) to carry the audio visual stuff and all of the literature and product cutaways for the seminars. Between the two business purposes we were actually using the coach almost 30,000 miles a year for business. The IRS has never taken issue with any of our deductions taken for the coach, which not only included depreciation, but every drop of fuel and every dollar spent on maintenance. Having a business purpose for a coach is like getting a 35% discount on everything associated with owning and operating a coach.