How is your business organized? The only time it's really necessary to "pay yourself a regular paycheck" is if the business is organized as a corporation or elected to be treated as one.
Also it's not really clear what you're referring to as "my tax liability for payback." It sounds like you were taking money out of your business, not as a paycheck but as some sort of "advance" or "loan" and there's no "tax liability" associated with that. You say "I've been paid for it." Paid for what? And then you say "I can't back pay the full amount but can pay quite a bit of it." What do you have to "pay back"?
You need to add considerable detail and explanation here.
