If you do not pay off the No Interest If Paid In Full balance before the expiration date, you will be charged the interest that accumulated since the transaction posting date at 19.99% APR. The amount of interest that has been accruing is tracked on the first page of your Klarna monthly statement.

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https://www.klarna.com/us/customer-service/happens-dont-pay-off-no-interest-paid-full-promotion-expires/