A remittance letter is written when partial or full payment is made to inform vendors or sellers of payment details. It should include payment amount, application, date, and mode. The letter identifies the reader as the vendor or creditor, establishes the objective of prompt payment, and determines the scope by clearly stating payment details. It closes thankfully or by stating an expected action from the reader. The document provides instruction on writing an effective remittance letter by identifying the reader, establishing the objective, determining the scope, and providing a closing.