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Box 12 on your W-2 tracks retirement contributions, HSA deposits, and benefits. Here's what those letter codes mean for your taxes. Boxes 12a and 12b on your W-2 are the first two slots where your employer reports compensation and benefits that get different tax treatment than ordinary wages.
When you're entering your box 12 info, don't enter the lowercase letters next to 12 (12a, 12b, 12c, 12d, sometimes 12a-d)—they're just line labels. Only enter the capital letter codes.
Box 12a on a W-2 contains specific codes and amounts that report various types of compensation or benefits, such as retirement plan contributions, tax-deferred benefits, or other employer-provided benefits.
Box 12 is divided into four parts: 12a, 12b, 12c, and 12d. Each line (12a, 12b, 12c, 12d) is used to report different codes and their corresponding amounts on Form W-2.
On your W-2 form, Line 12A indicates any employee contributions to a Section 401 (k) plan. This pre-tax contribution reduces your taxable income, thus, allowing you to save for retirement while minimizing your current tax liability.
What is Line 12A on a W2 Form? - W2 Tax Forms
Box 12 is divided into four subsections: 12a, 12b, 12c, and 12d. Each subsection shows a letter code on the left and the corresponding dollar amount on the right, separated by a vertical line.
Your W-2 has four sections in Box 12 labeled 12a, 12b, 12c, and 12d. These lowercase letters don’t mean anything. They just give your employer space to provide more information you need to prepare your tax return. But each amount entered in Box 12 also has an uppercase code that stands for something.