Does gta online progress carry over to story mode?

Quick Answer
No, progress made in Grand Theft Auto Online does not transfer to the single‑player story mode of Grand Theft Auto V.
Explanation
Grand Theft Auto Online and Grand Theft Auto V are separate components of the same franchise. Online is a persistent multiplayer world where players can earn money, own properties, and complete missions, while the story mode is a linear single‑player campaign with its own narrative and progression. Official documentation and community experience indicate that achievements, money, and vehicle ownership acquired in Online are not carried over to the story mode. Each mode maintains its own independent progression system and rewards. Therefore, any progress you make in Online will not affect your story mode experience.