Self-assessment of customs duty permits risk-based verification, document production, re-assessment, and speaking orders on disputed re-assessment. Importers and exporters are required to self-assess duty on imported or export goods, subject to verification by the proper officer on a risk-based selection basis. The officer may require documents or information to ascertain duty, and may re-assess duty where self-assessment is found incorrect. If re-assessment is contrary to self-assessment and not accepted in writing, a speaking order must be passed within fifteen days. A transitional explanation preserves the earlier provision for goods entered before Presidential assent to the Finance Bill, 2011.