Better Service for Taxpayers Act This bill requires the Internal Revenue Service (IRS) to ensure that (1) each IRS office and division is staffed with employees to answer phone calls during standard business hours; and (2) within 15 business days of receipt of a mailed tax return, the agency acknowledges receipt of such tax return by mailing the taxpayer a hard copy response letter. The letter shall include a phone number for the taxpayer to call with questions and a notification of tax return processing.