Code D means you were putting some money into your retirement plan. There is a retirement savers credit. To see if you qualify, follow this link: Retirement Savings Contributions Credit (Saver’s Credit)
If you qualify for the credit, you will want to do an amended return. Once your return is accepted and the finances are settled, you can file an amended return. See how to file an amended return.
Also, how to track an amended return.
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