Filing a Final Income Tax Return as Executor in Mississippi

If someone close to you has passed away and you've been named executor, you're likely dealing with a long list of responsibilities during an already difficult time. One of those duties is filing their final income tax return with both the IRS and the state of Mississippi. Getting this wrong can delay probate, trigger penalties, or leave you personally exposed to liability. Understanding how to file a final income tax return as an executor in Mississippi isn't just paperwork it protects the estate and the people who depend on it.

What does it mean to file a final income tax return as an executor?

When a person dies, their tax obligations don't disappear. As executor, you step into the deceased person's shoes for tax purposes. You're responsible for filing their individual income tax return IRS Form 1040 covering the period from January 1 through the date of death. This is separate from any estate tax return or fiduciary return the estate itself may need to file.

In Mississippi, you also need to file a final state individual income tax return with the Mississippi Department of Revenue. The state return covers the same period as the federal return.

Think of it this way: the person earned income during the year they died. Someone has to report that income and pay any taxes owed. That someone is you, the executor.

When is the final income tax return due in Mississippi?

The federal final income tax return is due on April 15 of the year following the death same deadline as any regular tax return. If you need more time, you can request an extension using Form 4868, but this only extends the time to file, not the time to pay.

Mississippi follows the same April 15 deadline for the state return. If the federal return gets an automatic extension, Mississippi generally honors that extension as well.

Keep in mind that if the estate earns income after the date of death such as rental income, interest, or dividends you may also need to file a separate fiduciary return on IRS Form 1041 for the estate itself. That's a different filing with its own deadline.

What forms do you need to gather and file?

Filing the final return starts with collecting the right documents. Here's what you'll typically need:

IRS Form 1040 – the individual income tax return for the year of death
Mississippi Form 80-105 – the state individual income tax return
IRS Form 1310 – Statement of Person Claiming Refund Due a Deceased Taxpayer (required if you're claiming a refund)
IRS Form 56 – Notice Concerning Fiduciary Relationship (lets the IRS know you're acting as executor)
All W-2s, 1099s, and other income documents for the deceased
Records of deductible expenses like medical bills, mortgage interest, and charitable donations
A copy of the death certificate
Certified letters of testamentary or other court documentation showing your authority as executor

You can find a more detailed breakdown of the forms an executor must complete in Mississippi on our related resource page.

How do you file the final return step by step?

Step 1: Get appointed as executor

Before you can do anything with the IRS or Mississippi DOR, you need legal authority. File with the probate court in the county where the deceased lived and obtain your letters testamentary. You can learn more about the filing deadlines tied to Mississippi probate court proceedings.

Step 2: Notify the IRS

File Form 56 to inform the IRS that you are the fiduciary responsible for the deceased person's tax matters. This ensures all correspondence goes to you.

Step 3: Gather financial records

Collect all income documents, bank statements, investment records, and receipts for deductible expenses. Contact employers, banks, and financial institutions if you're missing paperwork. Many will reissue documents once you provide proof of your appointment.

Step 4: Complete the federal return (Form 1040)

Report all income earned from January 1 through the date of death. Claim all applicable deductions and credits. Write "DECEASED," the person's name, and the date of death across the top of the return.

Step 5: Complete the Mississippi state return

File the Mississippi Form 80-105 using the same income and deduction information. Mississippi does not have a separate estate income tax at the state level, so the individual return covers the decedent's state tax obligation for their final year.

Step 6: File Form 1310 if claiming a refund

If the return shows a refund, attach Form 1310 to the federal return. Mississippi has its own process for refund claims on behalf of a deceased taxpayer, which you can handle through the state DOR.

Step 7: Pay any taxes owed

If the estate has liquid assets, pay any balance due from estate funds. Do not pay from your personal funds. If the estate doesn't have enough cash, you may need to sell assets to cover the tax liability.

What are common mistakes executors make on the final return?

Even well-meaning executors run into problems. Here are the most frequent errors:

Filing the wrong return type. The final Form 1040 is for income earned before death. Income earned after death goes on Form 1041 for the estate. Mixing these up is one of the costliest mistakes.
Missing Form 1310. Without this form, the IRS won't release a refund to the executor. It's a small form, but forgetting it can hold up thousands of dollars.
Forgetting to report all income. Interest, dividends, retirement distributions, and even canceled debts count as income. Check every source carefully.
Not electing to treat the decedent's medical bills as final-year deductions. Medical bills paid within one year of death can be deducted on the final return, even if they were incurred in a prior year. This is a generous provision many executors miss.
Ignoring Mississippi estate or inheritance tax filing requirements. While Mississippi doesn't currently impose a state estate tax for deaths occurring after 2005, the estate tax filing requirements for executors can still apply in certain situations, especially for larger estates or those with out-of-state property.
Filing late. Penalties and interest apply to late filings, even for deceased taxpayers. The clock doesn't stop because someone died.

Can you file the final return yourself, or should you hire a professional?

You're legally allowed to prepare and file the final return yourself. But here's the honest take: estate tax matters involve specific rules that differ from regular tax filing. The full process of filing as executor in Mississippi includes federal, state, and sometimes fiduciary returns, each with its own rules.

If the estate is straightforward a single W-2, a bank account, no complicated investments you might handle it with tax software or free IRS resources. But if the deceased owned a business, had multiple income streams, or the estate is large, a CPA or tax attorney experienced in estate taxation can save you money, time, and stress.

A professional can also help you take advantage of deductions and elections specific to final returns, like the medical expense deduction or the choice of fiscal year for the estate's fiduciary return.

What happens after you file the final return?

Once the IRS and Mississippi process the final return, a few things can happen:

Refund. If a refund is due, it goes to the estate. You'll need to distribute it according to the will or Mississippi intestate succession laws.
Balance due. If the decedent owed money, you pay it from estate assets. Tax debts take priority over most other debts under both federal and Mississippi law.
Audit or notice. The IRS or state may send a notice if something looks off. Respond promptly dealing with tax notices is part of your fiduciary duty.

After the final return is settled, you still may need to handle the estate's fiduciary return if the estate continued to earn income during probate. Wrap up all tax filings before closing the estate to avoid reopening it later.

Quick checklist before you file

Confirm your legal authority as executor (letters testamentary from probate court)
File IRS Form 56 to notify the IRS of your fiduciary role
Collect all income documents (W-2s, 1099s, Social Security statements)
Gather records for deductions (medical bills, charitable gifts, mortgage interest)
Complete IRS Form 1040 with "DECEASED" noted at the top
Complete Mississippi Form 80-105 for the state return
Attach Form 1310 if claiming a federal refund
Determine whether a Form 1041 fiduciary return is needed for post-death income
Pay any taxes owed from estate funds never from your personal account
Keep copies of everything for at least three years after filing

Tip: Start collecting financial records as soon as you're appointed executor. The sooner you organize the paperwork, the less stressful the filing process becomes. If you're unsure about any part of the return, consult a tax professional who handles estate returns in Mississippi before the April deadline approaches.