Vehicle Registration Is One Tax Increase... While the new year is close, the celebration may end abruptly on Jan. l. Honolulu residents can expect to see huge tax increases go into effect in 2006, including higher property assessments, increased sewer fees and a big hike in vehicle registration fees. Traci Loa...about the new fees. Loa drives a 7-year-old Chevrolet van. Like every other car owner on Oahu, this year Loa will have to pay 50 percent more to register her vehicle. "It's irritating," said Loa. "I mean, I could do so much more with the money... The vehicle tax hike...