A unique selling proposition, or USP, is the one reason a customer picks you over the alternatives, stated in a way a competitor cannot copy today. It combines something you do differently with something a specific group actually wants. A low price is rarely a USP, because a competitor with lower costs can match it.
A workable test is to write it as one sentence: for this group in this situation, we are the only provider that does this, and here is the proof. If you can delete the group and the sentence still makes sense, it is too broad. If a competitor could put their logo on it unchanged, it is not yet unique.
Numbers help you check whether the difference is worth paying for. Two bookkeeping services both charge 200 euros a month. One returns finished books within 24 hours, the other within two weeks. For a client who spends four hours a month collecting missing documents, and who values an hour at 60 euros, the faster service is worth 240 euros a month in saved time. That is more than the price, so the speed can carry a premium. If the saving were 20 euros, it could not.
In a generated business plan the USP shows up twice: once in the competition section, where it separates you from named rivals, and once in the marketing section, where it becomes the message. The same sentence should work in both places.
Three misunderstandings are common. First, founders list features (app included, personal service) instead of the outcome the customer buys. Second, they treat the USP as permanent. Most advantages get copied within a year or two; durable ones come from something hard to rebuild, such as an exclusive supply contract, a licence, accumulated data, or a network of users. Third, they confuse the USP with a slogan. The USP is an internal decision about what you are; the slogan is one way to say it.
