The housing loan information in the special additional deduction of individual tax can be found by the tax bureau. You can choose to fill in the special additional tax to deduct the mortgage, or you can choose to submit it by the employer. You can fill in the electronic version through the personal income tax APP and the website of the natural person electronic tax bureau, or you can fill in the paper version of the deduction information form on the spot through the office hall of the tax bureau. The tax bureau will check whether the completed special additional deduction declaration form is accurate and whether the declared amount and specific circumstances meet the additional deduction conditions, so that the tax bureau can find the housing loan information in the special additional deduction.