For income tax purposes, you cannot deduct funeral and burial expenses. If the decedent’s estate was large enough to be subject to federal estate tax, then these costs are deductible on the estate tax return, Form 706. The threshold for filing a federal estate tax return is $11.4 million for a decedent dying in 2019 and $11.58 million for a decedent dying in 2020.
Generally, an unmarried person who maintains a household for dependents and is allowed to compute his or her tax based on head of household rates, which are more favorable than single person rates.