Tax Benefits of Leasing a Car - IRS Depreciation Limits

I've been thinking about leasing a car (see my previous post about leasing certified pre-owned cars). My accountant told me to lease. But I like buying. I know there's a tax benefit to leasing, but I don't really understand it.If I was smart I would have asked my accountant to explain it to me. But I figured it should be simple to find out why by looking on the internet. It was more of a struggle