No federal law requires bereavement or funeral leave. The FMLA can apply if grief leads to a serious health condition that needs treatment, but it does not cover time off simply to grieve. Whether you get bereavement leave depends on your state and your employer.
Bereavement leave in the U.S.
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Even where the law does not require it, most employers offer some bereavement leave, commonly three to five days for an immediate family member. If your state has no mandate, you may be able to use paid sick leave, PTO, or, if the loss affects your health, the federal FMLA. Ask your employer what their written policy allows. This is general information, not legal advice.