Penalty limitation for minor tax breaches emphasizes proportionality, hearing rights, and mitigation for voluntary disclosure. Penalty imposition is limited by proportionality and procedural safeguards: minor breaches and easily rectifiable documentation errors without fraudulent intent or gross negligence should not attract penalty; penalties must be commensurate with facts and circumstances. No penalty may be imposed without opportunity to be heard, orders must specify the breach and applicable provision, voluntary pre-discovery disclosure is a mitigating factor, and the section excludes situations where the Act prescribes a fixed sum or fixed percentage penalty.