What do the codes mean in Box 15 of the K-1 for partnerships?

Credits
A: Zero-emission nuclear power production credit*
B: Credit for production from advanced nuclear power facilities*
C: Low-income housing credit (section 42(j)(5)) from post-2007 buildings *
D: Low-income housing credit (other) from post-2007 buildings *
E: Qualified rehabilitation expenditures (rental real estate)
F: Other rental real estate credits *
G: Other rental credits *
H: Undistributed capital gains credit
I: Biofuel producer credit
J: Work opportunity credit
K: Disabled access credit
L: Empowerment zone employment credit
M: Increasing research activities credit
N: Credit for employer Social Security and Medicare taxes
O: Backup withholding
P: Unused investment credit from qualifying advanced coal or gasification credit allocated from cooperatives
Q: Unused investment credit from qualifying advanced energy project credit allocated from cooperatives
R: Unused investment credit from the advanced manufacturing investment credit allocated from cooperatives
S: Unused investment credit from the clean electricity investment credit allocated from cooperatives
T: Unused investment credit from the energy credit allocated from cooperatives
U: Unused investment credit from the rehabilitation credit allocated from cooperatives
V: Advanced manufacturing production credit*
W: Clean electricity production credit*
X: Clean fuel production credit*
Y: Clean hydrogen production credit*
Z: Orphan drug credit
AA: Enhanced oil recovery credit
AB: Renewable electricity production credit
AC: Biodiesel and renewable diesel credit**
AD: New markets credit
AE: Small employer pension plan startup costs and contributions credit
AF: Small employer auto-enrollment credit
AG: Small employer military spouse participation credit
AH: Employer-provided childcare credit
AI: Low sulfur diesel fuel production credit
AJ: Railroad track maintenance credit
AK: Oil and gas production from marginal wells
AL: Distilled spirits credit
AM: Energy efficient home credit
AO: Alternative fuel vehicle refueling property credit
AP: Clean renewable energy bond credit*
AQ: New clean renewable energy bond credit*
AR: Qualified energy conservation bond credit*
AS: Qualified zone academy bond credit*
AT: Qualified school construction bond credit*
AU: Build America bond credit*
AV: Employer differential wage payments
AW: Carbon oxide sequestration credit
AX: Carbon oxide sequestration credit recapture*
AY: New clean vehicle credit
AZ: Credit for qualified commercial clean vehicles
BA: Health insurance credit
BB: Employer credit for paid family and medical leave
BC: Eligible credits from transferor(s) under section 6418*
ZZ: Other

* Not supported

** Sustainable aviation credit not supported

See the Schedule K-1 (Form 1065) instructions  for more info about these codes.

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