Penalty for service tax evasion: primary liability for tax and interest with reduced penalty for recorded transactions and prompt payment. Where service tax is evaded by reason of fraud, collusion, wilful misstatement, suppression of facts or contravention of provisions, the person served with notice under section 73(1) is liable, in addition to tax and interest, to pay a penalty equal to the determined service tax; that penalty is reduced to fifty percent where true and complete transaction details are available in specified records, and reduced penalty benefits require timely payment. Penalty and interest are adjusted to reflect appellate or judicial modifications to the tax determination.