be into (someone) for (something)

1. To be in debt to someone for some amount. Thank you so much for loaning me that money. I must be into you for thousands by now. It's worse than I thought—a loan shark is into him for tens of thousands. I'm into my brother for hundreds, thanks to that unexpected medical bill.

2. To be expecting a payment from someone for some amount. The contractor is already into us for thousands, so we better not have another leak! The city is into us for $10,000. What are we going to do? People don't realize until it's too late that these predatory loan companies are into them for thousands of dollars.

be ˈinto somebody for something

(American English, informal) owe somebody money or be owed money by somebody: By the time he’d fixed the leak, I was into him for $500. ♢ The bank was into her for $100 000.