Keep the contract, invoice, and payment amount on the same basis. Before customs declaration, reconcile every vehicle's price components and submit only after confirming that the invoice amount matches the declared value. For staggered payments or multicurrency orders, pay particular attention to corresponding amounts, and retain records linking payment evidence to invoices and contracts for any customs explanation. If the amount basis must be adjusted, first confirm local declaration rules with the customs broker, then decide whether to revise the invoice or provide supplementary explanations; do not alter documents yourself. This guidance does not replace destination-country procedural determinations; eligibility, taxes, registration, and local procedures remain subject to the latest requirements of relevant authorities, licensed institutions, and applicable contract provisions. For matching declared values and invoice amounts, see What Import Documents Should Buyers Prepare in Their Destination Country?.