From IRS Instruction for Form 5695:
Joint occupancy.
If you occupied your home jointly with someone, each occupant must complete their own Form 5695. To figure the credit, the maximum qualifying costs that can be taken into account by all occupants for qualified fuel cell property costs is $1,667 for each one-half kilowatt of capacity of the property. The amount allocable to you for qualified fuel cell property costs is the lesser of:
The amount you paid, or
The maximum qualifying cost of the property multiplied by a fraction. The numerator is the amount you paid and the denominator is the total amount paid by you and all other occupants.
These rules don't apply to married individuals filing a joint return.
Example.
Ava owns a house with Bruce where they both reside. In 2024, they installed qualified fuel cell property at a cost of $20,000 with a kilowatt capacity of 5. Ava paid $12,000 towards the cost of the property and Bruce paid the remaining $8,000. The amount to be allocated is $16,670 ($1,667 x 10 (kilowatt capacity x 2)). The amount of cost allocable to Ava is $10,002 ($16,670 x $12,000/$20,000). The amount of cost allocable to Bruce is $6,668 ($16,670 x $8,000/$20,000).
If you have Form 5695 and claiming joint occupancy, the IRS will not be accepting these returns until 3/16/25. You can see this on this IRS site. The language you see below is from Row 39 of the Tax Year 2024 spreadsheet.
Taxpayers claiming Joint Occupancy on Form 5695 will have to file via paper if filing their return before the Form 5695 schema is updated in mid-March. This temporary limitation should only impact a subsection of Form 5695 filers. For a preview of the TY24 draft form and instructions for Form 5695, please see the Draft tax forms on IRS.gov at https://www.irs.gov/draft-tax-forms. Submission of Forms 5695 that do not claim Joint Occupancy may be e-filed at the start of Processing Year 2025
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