Anyone who sells interior decorating or design services must register for New York State sales tax purposes if they deliver services in New York State. Cover letters must be custom-written for each opportunity you apply for as they are specific to each position and organization.Learn how to write an interior designer cover letter. Get expert tips and downloadable cover letter examples for all levels of experience. Submit the affidavit to your county with two (2) of the following documents as proof of residency. With over nine years of experience in interior design, I've developed the skills and knowledge necessary to successfully complete projects both large and small. In this guide, we'll delve into the best cover letter examples for Interior Designers, helping you to paint a vivid picture of your professional journey. Here at NCC, you will find an experienced and knowledgeable faculty and staff who will guide you on your path to achieving your academic and personal goals. In NYC you may sue for up to.