You might have moved since you filed your last return. If so, you probably arranged for your former post office branch to forward mail to your new address. However, not all postal branches forward government checks.
Notify the IRS of your address change. This ensures you receive refunds or mail regarding your past and current returns. Complete IRS Form 8822: Address Change Request and mail Form 8822 to the address provided on the form.
You can also write a letter informing the IRS of an address change. Mail this letter to the IRS campus where you filed your last return. Include your:
Old and new addresses
Social Security number (SSN)
You might have filed as married filing jointly last year, but you and your spouse have since established separate homes. If so, you both should notify the IRS of your new addresses.