Custom printed Income Tax Envelope 9 x 12 or 10x13. Are you an accountant or CPA who prepares tax documents. Here's a great way to help your clients keep track of the important tax documents and remember you for the next tax season. Just send us your business name, address and phone numbers and we'll print 500 white catalog envelopes customized with your information in black ink. Order now and be sure you have them on hand for the upcoming tax season.