Currently, the Denneroll is available in three sizesâfor tall or flexible adults (gray Denneroll), average or stiffer adults (white Denneroll), and small adults or pediatric patients (gold Denneroll)âthe Denneroll Cervical Orthotic Device is an important addition to your patient-care inventory.
Length of time to keep, and why:Seven years. 1  The IRS has three years from your filing date to audit your return if it suspects good-faith errors. 2  The three-year deadline also applies if you discover a mistake in your return and decide to file an amended return to claim a refund.
Keep IRS documents and state income tax returns for at least six years in case the IRS claims you underreported your income by 25 percent or more. Typically, the audit window is three years only, but if you underreported your gross income by 25 percent, the IRS has six years to audit you.