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.
How long does a tax auditor have to complete an audit? All tax audits must be completed within 3 years of the date the tax return was filed, unless the auditor has reached a settlement of agreement with the person being audited in order to extend the amount of time granted for the investigation of the tax return.