You can pay your property taxes online through the County of Marin.
FAQ Topic: Personal taxes
The city does not provide tax preparation services. Check the Tax-Aid for their locations in Marin that provide free high-quality tax return preparation for Bay Area families with incomes less than $54,000. AARP also offers free tax preparation aid to people who are 50 years and older.
You can find information about paying your federal income tax on the Internal Revenue Service website. Information about California State income tax can be found on the State Franchise Board website.