Does All Expenses Paid Mean?

If something is all expenses paid, it means that you do not have to pay for anything yourself: She's going on a trip to New York, all expenses paid.

What does it mean to be paid expenses?

Paid expenses are incurred expenses that you have paid for. For example, when you actually pay off the credit card used to buy supplies, the incurred expense becomes a paid expense. Oftentimes, expenses are paid almost immediately after incurring them.

Is it all expenses paid or all expense paid?

“All expense paid” uses expense as a mass noun; “all expenses paid” uses expense as a countable noun. You would choose the one that is closest to your intended meaning. As for hyphenation, you would typically use them when the phrase functions as an adjective, as in “all-expense[s]-paid vacation”.