You need to provide more details. Registered as what? Single member LLC? Multi-member LLC? S-Corp? C-Corp? Something else? Typically (i.e.; not always) an "unregistered" business is considered a sole proprietorship. But for all we know you may have had a partnership.
So what did you register the business as?
What type of business was it before it was "registered"?
In what tax year was the business (regardless of registration status) officially open for business? In that year, did the business have any income and/or expenses?
