The amount doesn't affect the law. But you don't *have* to file an amended return because there is no duty to correct an unintentional mistake. However, the IRS could match and send you a bill. I agree this is unlikely for $17 of missing and would not worry about it. Even if you added the $17 it might not result in any more tax owed. If the amount were larger you could file an amended return to avoid interest and/or penalties.
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