No, if your grandparents are married, they can gift you up to $26,000 per year tax-free. You do not pay tax on this gift; however, the burden of proof is on you to show the IRS (if you are ever audited) that this was in fact a gift. So your grandparents should write you a letter that they are gifting you this money. I would prefer it to be a check, rather than cash, because a check can be copied for records and easily traced to them, whereas cash can come from anywhere.
Answered on Oct 14th, 2013 at 6:38 PM