Let's say you created tag v1.0
too early. You can delete it from your local repository by running the following command.
$ git tag -d v1.0
If you've already pushed the tag, you can remove it from your remote repository with this command.
$ git push origin :refs/tags/v1.0
Then, if you want to create it and push it again later, you can go right ahead and do so.
$ git tag -a v1.0 -m "My new tag"
$ git push origin --tags