Paying the amount you spent on the card the previous month in addition to the minimum payment within 21 days of the statement date will allow you to make new
purchases on your balance transfer credit card while still avoiding interest.
Of course, being late with a
fee on a balance transfer credit card is not a good idea, because you can lose your zero interest, but being aware of all possible charged have never been bad.
In other words, why you shouldn't make purchases
on your balance transfer credit card:
If you miss even one payment
on a balance transfer credit card, your interest rate will reset to a much higher rate, effectively negating the main appeal of the card.