Summer is just around the corner. If you’re fortunate enough to own a vacation home, you may wonder about the tax consequences of renting it out for part of the year. The tax treatment depends on how many days it’s rented and your level of personal use. Personal use includes vacation use by your relatives (even if you charge them market rate rent) and use by non-relatives if a market rate rent isn’t charged. If you rent the property out for less than 15 days during the year, it’s not treated as “rental property” at all. In the right circumstances, this can produce significant tax benefits. Any rent you receive isn’t included in your income for tax purposes (no matter how substantial). On the other hand, you...