Use Pre-Addressed
IRS Label

Pre-addressed label provided in the tax package the IRS sent to the taxpayer, when available.
The use of this label (or its precisely duplicated label information) is extremely important for the efficient, accurate, and economical processing of a taxpayer's return. Labeled returns indicate that a taxpayer is an established filer and permits the IRS to automatically accelerate processing of those returns. This results in quicker refunds, less manual review by IRS functions, and greater accuracy in names, addresses, and postal deliveries

Using the pre-addressed label also ensures that your return reaches the proper processing site.