For Cuyahoga County property owners who feel like their property tax valuations for the tax year 2024 have missed the mark, the window to file a formal complaint opens up with the new year. Starting January 1, 2025, and running through March 31, 2025, the Board of Revision will be ready to receive these complaints, according to information released on the Cuyahoga County’s website. But remember, to officially be on time, complaints must be filed before 11:59 p.m. on March 31 or have a March 31 United States postmark. Procrastinators, beware. Other postmarks will not fly.