Zillow and Thumbtack found property taxes, maintenance and insurance now add $1,380 a month beyond mortgage payments ... The hidden costs of homeownership are rising and have increased by nearly one-third in the last five years as expenses like insurance, maintenance and property taxes take a bite out of homeowners' budgets. A new report by Zillow and Thumbtack found those costs amount to about $16,566 per year, which amounts to roughly $1,380 a month in addition to a mortgage payment. Within the $16,566 total cost, the typical U.S. homeowner faces about $11,171 in annual maintenance, $2,266 for homeowners insurance and...