Merriam Webster:
"debt- 2 something owed : obligation"
Merriam Webster:
"deficit- 2 a : an excess of expenditure over revenue b : a loss in business operations"
Let me put it like this: If a business owes 10 dollars in debt to an electrical company, and its losses (losses in part due to expenditure over revenue) during that certain time period are 60 dollars, does it have a loss of 70 dollars?