If the mortgage originated in the calendar year, shows the mortgage principal as of the date of origination. Who Needs to File Form 1098?Obtain forms from either the County Assessor or the Clerk of the Board in the county where the property is located). The Treasurer and Tax Collector mails the Annual Secured Property Tax Bills each year in October to every owner listed on the Secured Tax Roll. Single Married filling jointly. 2022. A Loan Estimate tells you important details about a mortgage loan you have requested. Copies of Form 1098: Mortgage Interest Statement. Received an RMS Tax Discovery Letter? Payment due date: Most mortgage payments are due on the first of the month. This is what they're referring to, and higher tax rates are often found in large cities like New York or Los Angeles.