Failing to file a zero GET return in Hawaii when no GET was collected results in penalties and interest on the owed tax amount. The Hawaii Department of Taxation may impose fines, accrue interest, and increase the likelihood of audits. Continuous failure to file zero returns can lead to additional sanctions, including possible suspension of the GET license, legal actions, and reputational damage. Regularly submitting zero returns maintains compliance and avoids financial and legal repercussions.