If a customer asks a company to do a project, but both customer and company don't know the exact amount of money needed, so the company just tells the customer:

Give me $X first, we will rebate you if we don't use that much, and if the cost exceeds $X you will need to pay the extra."

How to say this naturally and succinctly?

  • "...You may get a refund or be required to pay extra." Commented Jul 19, 2021 at 16:15
  • "Give me $X up front, and we'll refund you what we don't use, or bill you the difference if it costs more."
    – gotube
    Commented Jul 20, 2021 at 4:23

1 Answer 1


I think the sentence would look like this. It is not sure. Please give us guarantee for $X. When budget of the project aren't suitable to money, we will give refund or get some extra money.

  • 1
    This is not idiomatic English. Commented Jul 19, 2021 at 16:14
  • That's not even correct English
    – gotube
    Commented Jul 20, 2021 at 4:21

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