Declaration requirement for excise marketing and discount disclosures mandates annual filing and immediate updates to protect assessable value. A statutory requirement compels registered assessees to file an annual quadruplicate declaration of marketing pattern, discount structure and related details to the Range Superintendent in a prescribed proforma, with immediate refiling on any change. The Range Superintendent must acknowledge receipt, verify and forward copies with a report to the Divisional Assistant Commissioner, who endorses and distributes copies to the Range Superintendent and Valuation Cell while retaining the original. Where declarations appear incorrect or declared assessable values seem nonconforming, inquiries, provisional assessment with supervisory concurrence, selection for detailed scrutiny, or reassessment proceedings may be initiated to protect revenue.