So when I start to file if I am a qualified widow in 2019 what form do I change to? Filing Single? or jointly?

Is a qualifying widow the filing single for m or it is a joint form.  This would be the year after my husbands death.  He died in 2018?

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If you have not remarried and do not have any qualifying children as dependents then your filing status is Single on your 2019 tax return.