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Would I ever need credit card if my debit card is issued by MasterCard/Visa?
I haven't had a credit card in fifteen years. I use nothing but my debit card. (I find the whole idea of credit on a micro scale loathsome.) I have yet to encounter a single problem doing so, other than a lower than usual credit score for not keeping 23(!!!) revolving lines of credit open, or that's the number CreditKarma tells me I need in order to be an optimal consumer. In an nutshell, no, you don't NEED one. There are reasons to have them, but no.