Exemption for small scale units limits excise liability on initial clearances through tiered concessional duty rates and conditions. Tiered excise concession for registered small scale industry factories permits exemption or concessional duty on specified goods cleared for home consumption within prescribed aggregate value bands, with residual duty determined by alternate percentage or ad valorem bases subject to minimum ad valorem floors; applicability is conditional on registration, prior-year aggregate clearance limits, and exclusions defined in the annexure, and input credit for concessional inputs is furnished under the relevant rule at the rate otherwise applicable but for this notification.