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.
View all. I am often asked how long one should keep tax records. Naturally, the answer is not cut and dried. For example, the IRS states that you must retain your tax returns and all supporting documents including bank statements for a minimum of three years, which is generally how long they have to audit a tax return. If you live in a state that levies an income tax, the rule is generally expanded to four years.