A holiday home on the Baltic Sea or a weekend retreat in the countryside for own use are generally to be regarded as second residences. If, on the other hand, the holiday home is used exclusively for rental purposes, it is definitely not a second residence. In fact, an investment in holiday property can become a commercial property when certain income limits are reached. In both cases, the question of whether this constitutes a second residence is easy to answer. The situation is different if the property owners use their holiday home for themselves on weekends or during holidays and rent it out during the rest of the year.