Learn how to write a resignational letter if you're quitting for personal reasons. Begin your letter with a statement of intent that is brief and focused.State that you are resigning and the effective date. Considering the following points can help you avoid legal trouble and pick the right time to submit your resignation in Washington state. To help you draft your resignation letter like the example above, here's a checklist of what to include: What to include in a resignation letter. "A resignation letter should be short and to the point. Simply explain why you're leaving and the date of your departure. The following are the things to keep in mind when writing an immediate resignation letter: Write the date first. Explain only necessities. Like any formal letter, you need to start with the date and your contact details – the most suitable being your phone number and personal email address.