Enter your lump-sum Social Security payment information. TurboTax will automatically figure what, if any, taxes you owe due to the lump-sum payment. See:
A lump-sum payment is a one-time Social Security payment that you received for prior-year benefits. For example, when someone is granted disability benefits they'll receive a lump sum to cover the entire time since they first applied for disability. This period could cover months or years.
After you enter your SSA-1099 information, we'll ask if you received a lump-sum Social Security payment. If you didn't receive one, answer No and move on.
While your lump sum may include benefit payments for more than one year, you do not have to file an amended tax return for any prior year. You might need to pay taxes on a small portion of your lump-sum payment. However, you might be able to avoid these taxes by apportioning prior year benefits to those previous years’ income (still without filing any amended returns).