 So here's the bottom line. If you try to deposit an old check, you'll be taking a risk that the bank might say no and that you'll be hit with a deposit item return fee that can ding you for 10 or 15 bucks. If you're unsure what to do, it might be better to go back to the check writer and ask for a new check. You might say, I found a check you gave me a while ago. It must have gotten lost in the shuffle. Is it too late to cash it? I'm really sorry for the inconvenience. For more on this, visit bankrate.com.