According to Revenu Quebec, Schedule G will be available on January 31, 2025. This may be the reason why you don't see the T5008/RL 18 info in your Schedule G. You can consult this information on this link.
We suggest you to make sure all your Releves for your Quebec return are properly entered and, as soon as Revenu Quebec send us the finalized Schedule, TurboTax will be updated.
If after January 31st the issue persist and your software is updated, we suggest you to contact Product support team and report it. They will be able to screenshare with you and investigate, if needed.
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