From Schedule K-1 instructions: Generally, you are not required to complete the source credit form or attach it to Form 3800 if you are a taxpayer that isn't a partnership or S corporation, and your only source for a credit listed in Form 3800, Part III, is from a partnership, S corporation, estate, trust, or cooperative. (Instead, you can report this credit directly on Form 3800, Part III, and enter the EIN of the partnership in column (b) of Part III.)
