Filing 1120X for last year and 1120 for this year

we have a fiscal year starting 2/1. We inadvertantly included the prior years pension contribution with the current years contribution. This caused the deductions to be more than they should have been. The corp had a loss last year and now just not as big of a loss. So I need to fill out an 1120X for last year noting the before/after total decuction difference as well as the before/after taxable income (negative). No tax was owed and none still owed.

as well as M-1 and M-2 do I need to include balance sheet/M1/M2 forms along with my 1120X filed with IRS? I thought the Fed/IRS doesn't care about the balance sheet, only (NY) would care which I have to file a NY amended return CT-3, etc.

Cross-posted and answered here:

on last years 1120 form (Deductions for Pension plan). Note: we have a fiscal year starting 2/1. We inadvertantly included the prior years pension contribution with the current years contribution. This caused the deductions to be more than they should have been. The corp had a loss last year and now just not as big of a loss. So I need to fill out an 1120X for last year noting the before/after total decuction difference as well as the before/after taxable income (negative). No tax was owed and none still owed. > >Question: as this affects the Schedule L balance sheet (liabilities and equity) as well as M-1 and M-2 do I need to include balance sheet/M1/M2 forms along with my 1120X filed with IRS? I thought the Fed/IRS doesn't care about the balance sheet, only (NY) would care which I have to file a NY amended return CT-3, etc. > >This years

No, I am not an S corporation. I am a C corporation. Therefore I must file an

we have a fiscal year starting 2/1. We inadvertantly included the prior years pension contribution with the current years contribution. This caused the deductions to be more than they should have been. The corp had a loss last year and now just not as big of a loss. So I need to fill out an 1120X for last year noting the before/after total decuction difference as well as the before/after taxable income (negative). No tax was owed and none still owed.

equity) as well as M-1 and M-2 do I need to include balance sheet/M1/M2 forms along with my 1120X filed with IRS? I thought the Fed/IRS doesn't care about the balance sheet, only (NY) would care which I have to file a NY amended return CT-3, etc.

I believe it is appropriate to attach a revised page 5 of the 1120 as it is different then the original submission. In addition, if you filed any of the 5500 schedules that would change, you would also have to attach a revised copy of that.