Filing taxes after a loss, from final returns to surviving spouse rules

The tax obligations nobody explains

Death does not extinguish tax obligations, it creates new ones. Your person’s income for the year of death must be reported. The estate itself may generate taxable income. And the surviving spouse faces an entirely new set of filing options that can mean thousands of dollars in savings or unnecessary overpayment.

Unfortunately, most families learn about these obligations through bills, letters from the IRS, or conversations with accountants after the fact. Understanding the tax landscape early can prevent costly mistakes and ensure you’re taking advantage of every available benefit.

Your person’s final income tax return

The final Form 1040 covers income from January 1 through the date of death. This return is due on the normal filing deadline (April 15 of the following year) and is filed by the surviving spouse (if married) or the executor of the estate.

• A surviving spouse can file jointly for the year of death, which typically results in a lower tax rate and higher standard deduction than filing separately
• All income your person earned or received through the date of death is included: wages, interest, dividends, retirement distributions, Social Security, and business income
• Medical expenses paid within one year of death can be deducted on the final return, even if the estate paid them. This includes the final illness, hospitalization, and related costs
• Funeral expenses are not deductible on the individual return but may be deductible on the estate tax return if one is required
• If your person was self-employed, the self-employment tax is calculated on income earned through the date of death only

Estate income tax (Form 1041)

After death, the estate becomes a separate taxable entity. Any income the estate earns, interest on bank accounts, rent from property, dividends from investments, must be reported on Form 1041, the U.S. Income Tax Return for Estates and Trusts.

• The estate’s tax year can begin on the date of death and the executor can choose a calendar year or fiscal year end. A fiscal year election can defer the first filing and provide tax planning flexibility
• Income distributed to beneficiaries is generally taxed at the beneficiary’s rate, not the estate’s rate. Since estate and trust income tax brackets compress quickly (the top 37% rate applies at just over $15,000 of retained income), distributing income is almost always advantageous
• Administrative expenses, executor fees, attorney fees, accounting fees, and appraisal costs, can be deducted on either the estate income tax return or the estate tax return, but not both
• The estate can carry forward unused capital losses and net operating losses to the beneficiaries when the estate closes, providing a potential future tax benefit

Federal estate tax (Form 706)

The federal estate tax applies only to estates exceeding the exemption amount, which is $13.99 million per individual in 2025 and rises to $15 million in 2026 under the 2025 tax law, indexed for inflation thereafter. The vast majority of estates, over 99.9%, owe no federal estate tax.

However, even estates that fall well below this threshold should consider whether to file Form 706 to elect portability.

• Portability allows a surviving spouse to use the unused estate tax exemption of the spouse who died, in addition to their own. If that spouse used only $3 million of their $13.99 million exemption, the surviving spouse can add the remaining $10.99 million to their own exemption
• To elect portability, a complete and timely Form 706 must be filed, even if no estate tax is owed. The IRS has granted relief for late portability elections in many cases, but filing timely is strongly recommended
• State estate taxes operate independently from federal rules. A number of states and the District of Columbia impose their own estate taxes, often with much lower exemption thresholds (roughly $1–$7 million). A handful of states also impose inheritance taxes on the recipients
• The stepped-up basis rule is one of the most significant tax benefits in estate law. Inherited assets receive a new cost basis equal to their fair market value on the date of death, potentially eliminating decades of unrealized capital gains

Surviving spouse filing status

The tax code provides special filing status options for surviving spouses that can result in significant savings over the standard single filing rate.

• Year of death: The surviving spouse can file a joint return with their spouse for the year the death occurred. This preserves the married filing jointly tax brackets and standard deduction
• Years 1 and 2 after death: If the surviving spouse has a dependent child, they can use the “Qualifying Surviving Spouse” (formerly Qualifying Widow/Widower) filing status, which allows use of the married filing jointly tax rates
• Year 3 and beyond: Without a dependent child, the surviving spouse reverts to single filing status. With a dependent child, Head of Household status may apply
• The transition from joint filing to single filing status is one of the most commonly overlooked financial impacts of losing a spouse. The tax increase can be substantial and should be factored into long-term financial planning

Getting it right matters

Tax errors during estate administration are common and can be expensive. The rules are complex, the deadlines are strict, and the consequences of mistakes range from penalties and interest to personal liability for the executor.

LumenUs’s care plan tracks every tax-related deadline applicable to your situation, explains the options available to you at each stage, and helps you organize the documents your accountant will need. You don’t need to become a tax expert, you just need a system that makes sure nothing gets missed.