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Top long-0% purchase cards for new cardholders. Barclaycard. Longest 0% period, but some could get fewer interest-free months. You'll get the full 21 months at 0% if you're showing as pre-approved in our eligibility calculator. If you're not, you could get just 10 months at 0%, so it might be better in that case to look at the cards below. best credit cards excellent credit