If you have a Flexible Spending Account associated with your health insurance, you'll want to make any FSA-eligible purchases before midnight on the 31st.

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FSA funds can be used for copayments, deductibles, some drugs, and some other health care costs, plus reduce your taxes, according to healthcare.gov.

Here's a list of items that are usually FSA-eligible, though your specific health care plan may include things not on this list.