While processing your tax return the IRS conducted a review of the wages, withholding, and credits claimed and were not able to verify the amounts you reported. Therefore, a proposal to disallow your wages, withholding, or credits and to adjust your account. This could possible result in a reduced refund amount or a balance due.
The IRS is required to send a statutory notice of deficiency to a taxpayer’s last known address by certified mail. The last known address is generally the address that appears on your most recently filed and properly processed tax return unless the IRS is given clear and concise notification of a different address.