CT Scanners. Usually this instrument is used in the medical field, but it is also used in paleontology. In paleontology these are used to identify the reptiles and animals that are found in rocks without actually cracking the rocks.
4. You do not file a return: Keep records indefinitely. 5. You file a claim for credit or refund after you file your return: Keep records for three years from the date you filed your original return or two years from the date you paid the tax, whichever is later. 6. You file a claim for a loss from worthless securities or bad debt deduction: Keep records for seven years. 7.
Records Retention Guideline #3: Keep tax records for 6 years. The IRS may go back 6 years to audit your tax returns for errors or incorrectly claimed deductions â so itâs important that you keep all tax-related documents for that length of time, including: 1  Bank records. 2  Personnel and payroll records.