Is seeking compensation for a loss resulting from the sale of a vehicle due to the employer's delay in paying dues considered usury, given that he verbally agreed to cover the price difference and is responsible for the loss?

It is not permissible to burden the debtor with loss due to his procrastination in repayment, because obliging him to bear the loss or pay an increase on the fixed debt is considered usury (riba).

Procrastination in repaying debt, when one is solvent, is forbidden. The Prophet, peace and blessings be upon him, said: "The procrastination of the rich is injustice," and "Give the laborer his wages before his sweat dries."

The debtor must fear Allah and render rights to their owners. And whoever takes people's money with the intention of repaying it, Allah will repay on his behalf. If the debtor voluntarily adds something, this is a sign of good repayment, and there is reward and chivalry in it. The Prophet, peace and blessings be upon him, said: "Indeed, the best of you are those who are best in repaying."