"A resignation letter should be short and to the point. Simply explain why you're leaving and the date of your departure.It typically includes the date of resignation, a brief explanation for leaving, and an expression of gratitude towards the employer for the opportunity given. Begin your letter with a statement of intent that is brief and focused. State that you are resigning and the effective date. The following are the things to keep in mind when writing an immediate resignation letter: Write the date first. Explain only necessities. It is not necessary to officially provide a reason for leaving or resigning. Learn how to write a letter of resignation to quit your job on good terms. Note your last working day. 5.