Am I a bad person if I know I owe a business, but haven't paid because no invoice?

Depends on the business.

Mom and pop? You're an a-hole.

Large business? ...how can you pay a bill you don't have.

Made up story.

I guess I'm a bad person. If a company doesn't send an invoice within 4 months of work complete, I will absolute stiff you per our Ts and Cs at current company.

Then dare you to sue me.

I do it regularly.

Have you called requesting an invoice? Might have been sent to the wrong address or lost in the mail. If there's no record of it, you have nothing to pay... kind of a bad move not to call them up and check on it, though.

As previously posted maybe it got lost in the mail.
What happens if you move on and a year later they send it and you aren’t prepared to pay? Mom and Pop shop or not. Good business practice is to pay in a timely order and not ignore debt just because you didn’t get a piece of paper.

I have to do monthly cost projections on my jobs, so I’m always asking vendors to send their shite because I know it’s coming sooner or later. The quicker I know about it, the better my projections are. I’ve got a select few companies that send stuff months later, so they’re usually on my email list after about a month or 2

I do not enjoy telling people to pay their bills. I shouldn’t have to.

Karma is a bitch. Do the right thing and pay

Be honest and ask them for an invoice. If they don’t produce one, at least you tried to pay them.

We self audit every year and pay subcontractors whether they invoiced or not. If you knowingly owe money and don’t pay it’s the same as stealing.