Whether a Sullivan & Cromwell partner-turned-investment-banker earns $330,000 a year, twice that amount or 10 times as much has sharply divided the Manhattan appeals court reviewing the maintenance and child-support arrangements of his 2005 divorce.

A 3-2 majority of the Appellate Division, 1st Department last week ruled that Allan M. Chapin had a history of under-reporting his income and that obliging him to pay roughly $146,000 a year in maintenance and child support to his ex-wife, Janet M. Johnson, was not excessive.