Passive activity loss rules are what stop most rental investors from using their paper losses against W2 income. The IRS classifies rental real estate as a passive activity by default, regardless of how actively you manage it. Passive losses can only offset passive income. If your rental generates a $12,000 paper loss from depreciation and your only other income is W2 wages, the loss does not reduce your tax bill. Instead, it suspends and carries forward indefinitely until you either generate passive income to absorb it or sell the property in a fully taxable transaction, at which point any suspended losses release in full. There are two main exceptions. First, the $25,000 active participation allowance lets taxpayers with adjusted gross income under $100,000 deduct up to $25,000 of rental losses against other income if they actively participate in management. The allowance phases out between $100,000 and $150,000 AGI. Second, Real Estate Professional Status (REPS) completely exempts qualifying taxpayers from passive loss rules, allowing unlimited rental losses to offset W2 and business income. This is why high income professional investors and their spouses often pursue REPS aggressively.
Example
Single filer with $85,000 W2 income and a rental generating an $8,000 paper loss from depreciation. Because AGI is under $100,000 and the taxpayer actively participates, the $8,000 loss offsets W2 income, saving roughly $1,920 in federal tax at a 24% bracket.