Internal checks determined the state Healthplanfinder website was miscalculating the amount of tax credits applicants were eligible for. So exchange officials decided to shut the site down for repairs. They hope to have it back up on Sunday. “It’s our plan to be up as soon as possible,” said Michael Marchand, communications director of the Washington Health Benefit Exchange, which operates Healthplanfinder. By early evening Saturday, the exchange issued a release saying it is expected to be back online by 8 a.m. Sunday. The tax-credit calculations are critical to the site’s utility. Based on an applicant’s income level, the credits...