Registration alone does not make you liable for past uncollected sales tax assuming you did not have a business presence in the state or collect tax on the state's behalf. If you had a business presence in the state, you are liable for past taxes. If you have a past tax liability in your market states, you should make a voluntary disclosure. Contact the revenue agency in each of your market states for more details.
To read more! Will registration with my market states make me liable for any past sales tax? Source: InfoTaxSquare Business Documents Filing In All Fifty States!