Will I be charged after my free trial period ends?
Yes, unless you cancel the service within the free month period online at hpinstantink.com, the monthly service fee based on your chosen plan, plus applicable taxes and overage fees, will be charged to your card. You are responsible for any overage fees and applicable taxes even during the free month period.
From the official HP Officejet Pro 6830 E All-in-One Printer manual, page 2
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