And if you make under $32,500 per year as a single tax filer or $65,000 per year as a married joint filer, you can also take advantage of the saver's credit. This provides a tax credit worth between 10% and 50% of the first $2,000 in retirement contributions each person makes, which means married joint filers can get up to $2,000 in free money for retirement.

5. Claim your full employer match

If your employer offers a workplace 401(k), many times they'll also match part of the contributions you make toward it. For example, your employer may match 50% of your contributions up to 6% of your salary. If your employer matches contributions, they are giving you free money. You should claim every dollar of it that's available to you by making sure you invest enough in your 401(k) to get the full match.

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