The basic difference between these two filing bases is whether you have used the mark on all the goods/services. If you have already used your mark in commerce, you may file under the “use in commerce” basis. If you have not yet used your mark in commerce, but intend to use it in the future, you must file under the “intent to use” basis. An “intent to use” basis will require filing an additional form and fee that are unnecessary if you file under “use in commerce.”
For more information, see here: https://www.uspto.gov/trademarks
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