Like almost every president who preceded him, Lincoln's actions at the time were somewhat controversial. Some of his most controversial decisions might actually be considered now to be abuses of the Presidential power.
When you find that you need to amend a tax return, you need to make sure the statute of limitations on filing one hasn't run out. The statute of limitations, or time allowed for the action, on getting a refund from an amended tax return is three years.
How long will it take the IRS to process my amended federal tax return? It typically take the IRS between 8 and 12 weeks to process amended returns from the date your Form 1040X is received by the IRS via postal mail.