If you own rental property, classifying it as a trade or business can have an impact on the tax breaks for rental real estate.
Tax Breaks for Rental Real Estate

If you own rental property, classifying it as a trade or business can have an impact on the tax breaks for rental real estate.
If your ventures are passive activities, the passive activity loss rules prevent you from deducting expenses that are generated by them in excess of their income.
If you own rental real estate, its classification as a trade or business rather than an investment can have a big impact on your tax bill.