In this article, we will review what letters to clients are, provide tips for writing them, and templates to help you craft great client letters. What does your company do?What industry are you joining? Get to the point quickly and be concise. , but don't be impersonal or abrupt. Below is a list of forms that you may download for free from our website. Get your business tax receipt. The county and city will require a Business Tax Receipt license. This sample letter has choices to help you build your letter. When you write, pick the words that describe your situation.