IRS Form 706 Schedule K Guide: Estate Debts & Mortgages

1. Introduction – What is Form 706 (Schedule K)?

IRS Form 706 (Schedule K), officially titled Schedule K – Debts of the Decedent, and Mortgages and Liens, is a mandatory supporting schedule attached to IRS Form 706 (United States Estate Tax Return). Governed by the Internal Revenue Service (IRS), it allows estate executors to claim deductions for valid debts, liabilities, mortgages, and claims owed by a decedent at death.

A decedent’s financial estate consists of both assets and liabilities. To determine the net taxable wealth passed on to beneficiaries, federal tax law permits executors to subtract legally enforceable liabilities existing at the time of death.

Under Section 2053 of the Internal Revenue Code, Schedule K itemizes all personal debts—such as credit card balances, medical bills, unpaid income taxes, promissory notes, and property mortgages—reducing the total gross estate on Form 706.

2. Purpose of the Form

The primary purpose of Schedule K is to calculate the net value of an estate by subtracting legitimate financial liabilities from total gross assets.

Schedule K solves the challenge of distinguishing between gross wealth and net wealth. An estate may hold millions in gross real estate or business assets, but if those assets are heavily mortgaged or encumbered by medical and credit card debt, taxing the gross amount would be unfair. Schedule K ensures that federal estate tax is assessed only on net equity.

Additionally, Schedule K enforces strict bona fide debt standards under Treasury Regulation Section 20.2053-4. It verifies that claims against the estate are genuine, legally enforceable under local state law, and backed by full and adequate financial consideration.

3. Who Needs to File This Form

Schedule K must be completed and attached to Form 706 whenever an estate executor claims estate tax deductions for valid liabilities or mortgages owed by the decedent at the date of death.

An estate executor must list liabilities on Schedule K for any of the following deductible debt categories:

• Unpaid Personal Liabilities: Credit card balances, personal loans, outstanding utility bills, and unpaid medical or hospital bills incurred prior to death.
• Unpaid Income and Property Taxes: Pre-death income taxes owed to federal, state, or local tax authorities, and property taxes accrued prior to the date of death.
• Real Estate Mortgages: Outstanding mortgage principal and accrued interest on real property included at full gross value on Schedules A, E, or G.
• Promissory Notes Payable: Commercial loans, business lines of credit, or personal notes owed by the decedent to third parties.
• Court-Ordered Obligations: Enforceable alimony or property settlement obligations arising from divorce decrees.

4. Who Is Exempt / Not Required to File

Schedule K applies specifically to debts and liabilities existing on the decedent’s date of death. Certain expenses and non-deductible items are excluded.

You should NOT list liabilities on Schedule K in the following situations:

• Post-Death Expenses: Administration expenses incurred after death (such as executor commissions or attorney fees) are reported on Schedule J or Schedule L, not Schedule K.
• Mortgages on Non-Gross Estate Property: Mortgages on property that is not included in the decedent’s gross estate cannot be deducted on Schedule K.
• Medical Expenses Claimed on Income Tax: Pre-death medical bills that the executor elected to deduct on the decedent’s final individual income tax return (Form 1040) under Section 213(c).
• Unenforceable Promises: Informal family promises or voluntary pledges not supported by full monetary consideration.
• No Outstanding Debts: Estates where the decedent owed zero debts, credit cards, or mortgages leave Schedule K blank.

5. When to File

Schedule K is an integrated supporting schedule attached to Form 706 and shares its exact federal filing deadline.

Review the primary submission timing deadlines:

• Nine-Month Due Date: Schedule K must be submitted attached to Form 706 within 9 months of the decedent’s date of death.
• Six-Month Extension: If the executor files Form 4768 to request an automatic 6-month filing extension, Schedule K is submitted when Form 706 is filed (15 months from the date of death).

6. Where and How to File

Schedule K is attached directly behind Schedule J in alphabetical schedule order on Form 706. It is filed by paper mail as part of the complete estate tax return package.

Mail the complete Form 706 package—including Schedule K, mortgage payoff statements, final medical bills, and loan agreements—to the designated IRS submission center address listed in the official Form 706 instructions (typically the IRS Center in Kansas City, MO).

7. Step-by-Step Instructions to Fill the Form

Schedule K is divided into two distinct sections: Debts of the Decedent and Mortgages/Liens. Review the column breakdown below.

Schedule K Section	Field / Category	Required Information to Report
Top Section	Debts of the Decedent	Item number, creditor name, nature of claim (credit card, medical bill, tax owed), and exact dollar amount.
Bottom Section	Mortgages and Liens	Item number, description of mortgaged asset, lender name, mortgage date, interest rate, principal, and accrued interest.

Section 1 – Debts of the Decedent (Claims Against Estate)

List each personal liability separately. Identify the creditor name, describe the nature of the claim (e.g., “Memorial Hospital – Pre-death medical care”), and enter the unpaid balance plus accrued interest through the date of death. Unpaid federal income tax liabilities from prior years should be listed with the exact tax form and tax year specified.

Section 2 – Mortgages and Liens Guidelines

Provide complete details for every mortgage or lien encumbering estate property:

• Mortgage Description: State the exact property description and cross-reference the schedule where the property is reported (e.g., “Mortgage on real estate listed on Schedule A, Item 1”).
• Lender Details: Disclose the mortgage lender name, original note date, original amount, interest rate, and maturity date.
• Gross Value Reporting Rule: The mortgaged real estate or property MUST be reported at its **full gross Fair Market Value** on Schedule A, E, or G without subtracting the mortgage. The mortgage principal and accrued interest are then deducted in full on Schedule K.

Total Line

Sum all debts from Section 1 and all mortgages/liens from Section 2. Carry this combined sum over to **Form 706, Part 5 (Recapitulation), Line 15**.

8. Required Documents/Information Needed Before Filling

The IRS requires detailed verification for liabilities claimed on Schedule K. Executors must gather formal creditor records prior to completing the schedule.

Ensure you have the following verification materials ready:

• Mortgage Payoff Statements: Official date-of-death payoff statements from mortgage servicers showing exact principal balances and interest accrued through the date of death.
• Final Medical & Hospital Invoices: Itemized medical bills for doctor visits, hospital stays, and care facilities incurred prior to death.
• Credit Card Final Statements: Closing statements for all credit card accounts showing balances on the date of death.
• Tax Return Records: Copies of pre-death Form 1040 income tax returns showing unpaid income tax liabilities.
• Signed Loan Contracts: Certified copies of promissory notes, personal loan agreements, or divorce property settlement decrees.

9. Common Mistakes to Avoid

Deduction errors on Schedule K frequently trigger IRS estate tax audits and adjustments. Avoid these major pitfalls:

• Netting Mortgages Directly Against Property Values: Subtracting a mortgage directly from real estate values on Schedule A, and then deducting the same mortgage on Schedule K. This results in an unallowable double deduction.
• Claiming Double Medical Deductions: Deducting pre-death medical expenses on Schedule K after electing to deduct them on the decedent’s final Form 1040 income tax return. Section 213(c) prohibits double medical deductions.
• Deducting Informal Family Loans: Claiming deductions for alleged debts owed to children or family members without formal signed promissory notes or proof of arm’s-length financial consideration.
• Deducting Post-Death Taxes: Deducting real estate property taxes or income taxes that accrued *after* the date of death. Only pre-death taxes are deductible on Schedule K.
• Omitting Accrued Mortgage Interest: Reporting only the principal mortgage balance and forgetting to calculate interest accrued up to the date of death.

10. Penalties for Non-Filing or Errors

Fabricating claims or overstating debt deductions on Schedule K carries severe statutory penalties under federal tax law.

Key penalty risks include:

• Disallowance of Claimed Deductions: The IRS will disallow unverified or non-enforceable claims, increasing the taxable gross estate and generating an immediate estate tax deficiency bill.
• Accuracy-Related Penalty (IRC Section 6662): A 20% civil penalty applies to estate tax underpayments resulting from negligence or overstated liabilities.
• Civil Fraud Penalty (IRC Section 6663): A 75% penalty applies if the IRS proves that fabricated debts were claimed to fraudulently reduce federal estate tax.

11. Related Forms or Schedules

Schedule K operates in direct combination with several core Form 706 schedules and personal income tax returns:

• Form 706: United States Estate (and Generation-Skipping Transfer) Tax Return.
• Form 706 (Schedule A): Real Estate (for mortgaged properties).
• Form 706 (Schedule E): Jointly Owned Property.
• Form 706 (Schedule J): Funeral Expenses and Expenses Incurred in Administering Property Subject to Claims.
• Form 1040: U.S. Individual Income Tax Return (for final individual return medical election under Section 213(c)).
• Form 4768: Application for Extension of Time To File a Return and/or Pay U.S. Estate Taxes.

12. Frequently Asked Questions

1. What is IRS Form 706 Schedule K?

IRS Form 706 Schedule K is the supporting schedule used by estate executors to itemize and deduct valid debts, personal claims, credit card balances, and real estate mortgages owed by a decedent at death.

2. How are mortgages reported on Schedule K versus Schedule A?

Real estate is reported at full gross Fair Market Value on Schedule A without subtracting mortgage debt. The outstanding mortgage balance and accrued interest are then deducted separately on Schedule K.

3. Can credit card debt and pre-death medical bills be deducted on Schedule K?

Yes. Credit card balances, utility bills, and medical expenses incurred before death and paid by the estate are fully deductible on Schedule K as debts of the decedent.

4. Can debts owed to family members be deducted on Schedule K?

Debts owed to family members are deductible only if the executor provides written proof of a legally binding promissory note supported by full financial consideration (actual money loaned) and market interest rates.

5. What is the rule for deducting pre-death income taxes on Schedule K?

Federal, state, or local income taxes owed by the decedent for tax periods prior to death are fully deductible as debts on Schedule K. Income taxes on post-death earnings are not deductible on Schedule K.

6. Can I deduct medical bills on Schedule K if claimed on the final Form 1040?

No. Under Section 213(c), pre-death medical expenses can be claimed as an income tax deduction on the final Form 1040 OR as an estate tax deduction on Schedule K, but not on both returns.

13. Conclusion

IRS Form 706 (Schedule K) is a vital schedule for establishing an estate’s true net value. By properly itemizing credit card debts, medical bills, unpaid taxes, and mortgages, executors significantly reduce the estate tax burden legally.

To ensure a successful filing, obtain date-of-death payoff statements for all mortgages, verify that real estate is reported at gross value on Schedule A, retain receipts for medical and personal liabilities, avoid double deductions, and carry totals over to Form 706.