https://www.irs.gov/zh-hans/businesses/corporations/research-credit-claims-section-41-on-amended-returns-frequently-asked-questions
Five items of information need to be included when filing an amended tax returns that includes a new or increased research credit claim. The amended return...
credit claimsamended returnsfrequently askedresearchsection
https://www.irs.gov/es/e-file-providers/guidance-for-amended-partnership-returns
On January 8, 2007, the MeF system for Forms 1065 and 1065-B was launched. As part of this new Platform, amended returns will now be accepted for the 2006 tax...
internal revenue servicepartnership returnsguidanceamended
https://www.mass.gov/regulations/830-CMR-62c262-amended-returns
830 CMR: DEPARTMENT OF REVENUE 830 CMR 62C.00: STATE TAX ADMINISTRATION 830 CMR 62C.26.2: Amended Returns
amended returnscmrmassgov