Does amortization start accumulating on trade date or settlement date?

Amortization typically starts accumulating on the trade date, as this is when the transaction is executed and the financial obligation is established. However, for accounting purposes, the actual cash flows and interest calculations may be based on the settlement date, which is when the transaction is finalized and ownership is transferred. It's important to refer to specific accounting standards and practices applicable to the financial instruments in question for precise guidance.