After you register for VAT, you cannot sell goods without bills.
You must register for VAT if you are in business with a turnover above a certain amount. If you are already registered for Sales Tax, there is no need for a fresh registration. If not, then the basic steps for VAT registration are presented here.
In this world nothing can be said to be certain, except death and taxes.
–American President Benjamin Franklin (1706–90).
Death and taxes may be certain, but we don’t have to die every year
There is no legal definition of ‘business’. What matters under VAT is if you are ...