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Only 10% of the total cost was paid in 2023 and the rest was paid in Feb 2024
You would claim the credit based on when the installation was completed. If the installation was complete in 2023, then claim the total cost on your 2023 tax return even though the total amount had not yet been paid.
According to the IRS Instructions for Form 5695, 'costs are treated as being paid when the original installation of the item is completed'.
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