Core Viewpoint - The National Taxation Administration has clarified that taxpayers who meet certain conditions can enjoy personal income tax deductions for housing loan interest when converting a second home loan to a first home loan [1][3]. Group 1: Tax Deduction Eligibility - Taxpayers can only enjoy the housing loan interest deduction once [3]. - Those who have not previously enjoyed the housing loan interest deduction and have completed the "second home to first home" procedure can start enjoying the deduction from the month they begin repayment at the first home loan interest rate [3][6]. - Taxpayers who switch from commercial loans to housing provident fund loans can continue to enjoy the housing loan interest deduction, as long as the property remains the same [7][8]. Group 2: Policy Context and Market Impact - The policy is a response to previous measures such as "recognizing houses, not loans" and aims to alleviate the tax burden on homebuyers [17]. - The impact on the real estate market is relatively small, but it signals positive coordination among various policies and departments [3][17]. - The policy primarily benefits those who were previously classified as second homes due to historical loan records, allowing them to apply for first home loan rates and tax deductions [18].