eTEAS Plus does not allow the filing of an application using a free-form description of goods and/or services whereas eTEAS does allow you to write your own description. Using eTEAS Plus, you must choose from the pre-approved goods/services descriptions to describe what you are offering in interstate commerce under your mark. You are rewarded for using the pre-approved descriptions via lower filing fees. The PTO reduces the standard per class filing fee of $325 by $50, or $275 per class, if you use eTEAS Plus. You should only use the pre-approved descriptions if they will effectively describe the goods and/or services in use under the mark.
If you do not file correctly using eTEAS Plus, the additional $50 per class will be assessed your filing in an office action.