Depending on the nature of your site, setting up structured data for it could be important. Even if you do, though, it won’t directly impact your rankings.
For more, check out the full post over on the Search Engine Roundtable blog.
Using structured data on your site can be a great thing to do, and it can help with various things related to Google. In terms of pure rankings, though, structured data doesn’t make a difference.
In a recent thread on Reddit, Google’s John Mueller said:
“Just to set expectations, structured data generally wouldn’t be seen as a ranking factor — it’s just the search result that might be shown differently. Sometimes that difference is enough to make it worthwhile though. Also, think about what it is that you want to achieve with it, don’t just do it because it’s possible.”
For now it seems that structured data is similar to meta descriptions; it can impact how your site appears in search results, but doesn’t change where you rank. Just like good meta descriptions, helping your search listing look great can help get you more clicks, so working on your structured data is likely a good use of your time.
There’s thought that it may eventually become a ranking factor, but certainly doesn’t seem to be one for now.