Browse
Log in / Register
Share
The mortgage interest deduction (MID) for second homes is a significant tax benefit, but it primarily aids higher-income households and is under scrutiny for reform. With the potential to generate over $43 billion in federal revenue if repealed, this provision highlights a central tension in U.S. housing policy: whether tax incentives should support vacation property ownership amid a shortage of affordable primary homes. This article explains how the deduction works, who benefits, and the potential market consequences of its elimination.
The mortgage interest deduction (MID) is a provision in the U.S. tax code that allows homeowners to deduct interest paid on mortgage debt from their taxable income. For a property to qualify as a second home for tax purposes, the owner must use it for at least 14 days per year or 10% of the days it is rented out, whichever is greater. The current law permits deducting interest on up to $750,000 of total mortgage debt spread across a primary residence and a second home. However, to claim this deduction, taxpayers must itemize their deductions on their tax return instead of taking the standard deduction, a choice made by fewer than 10% of filers since the standard deduction was increased in 2017.
Research indicates the deduction disproportionately benefits high-earning households. According to a Bipartisan Policy Center analysis, households earning over $150,000 per year account for 64% of the tax filings and 84% of the total dollar amount deducted through the MID. This is because higher-income families are more likely to itemize deductions and own secondary properties. The deduction is estimated to cost federal revenues nearly $26 billion in 2025 alone, leading critics to label it a regressive tax policy. In contrast, a proposal to eliminate capital gains tax on primary home sales is estimated to cost significantly less, around $6 billion.
Proponents of repeal argue it could free up housing supply and generate substantial revenue. With the housing market constrained by low inventory, eliminating the tax advantage for second homes could incentivize some owners to sell, potentially increasing supply for primary homeowners. Estimates from the Yale Budget Lab suggest repealing the benefit could generate $43 billion to $108 billion over a decade.
However, experts warn of unintended consequences. Eliminating the deduction could make second-home ownership more expensive for middle-income buyers, particularly in areas reliant on tourism. A 2020 study in the Journal of Urban Economics on a Swiss policy limiting second homes found it led to a 15% drop in primary home price growth and a 12% rise in unemployment in resort towns. Such outcomes could exacerbate housing inequality rather than reduce it. Additionally, households in transition—such as those relocating for work or carrying two mortgages during a move—could face unforeseen financial hardship.
The future of the second-home MID is uncertain as lawmakers seek solutions to housing affordability. States like Montana are already implementing higher property tax rates for second homes, effective in 2026, to encourage turnover. At the federal level, any repeal would need to be carefully structured to avoid destabilizing local economies and hurting middle-class buyers who rely on the deduction.
Based on our experience assessment, the central challenge for policymakers is balancing the goal of raising revenue and improving primary home affordability against the risk of harming housing markets dependent on secondary properties. The potential market reaction is complex and not easily predictable.
Key considerations for homeowners and prospective buyers include:
