That which is permitted only at a loss is not permitted to be done.

Explanation

(English-origin maxim.) An act that can only be performed at a loss is not truly permitted — the law does not grant permission that would destroy the very right it purports to allow.

Where this applies

• A regulation technically allows a farmer to sell raw milk, but only if he meets requirements so expensive they would bankrupt him — the permission is illusory because it can only be exercised at a ruinous loss.
• A city permit allows a homeowner to rebuild after a fire, but the conditions attached are so costly that rebuilding would cost more than the property is worth.
• A license to operate a small business is available, but the fees and compliance costs exceed all possible revenue, making the permission meaningless.