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Sorry for your loss.   My husband also died in 2023.  I filed 2024 as Single.   Do you have a child?

You can file a Joint return the year your spouse died.  For the next two years following a husband's or wife's death, the surviving spouse can file as a qualifying widow or widower if they have a qualifying child. That basically lets you continue to use the same tax brackets that apply to married-filing-jointly returns.  After the year of death if you don't have a child you file as Single.