To fill out IRS Form 56, Notice Concerning Fiduciary Relationship, you identify the taxpayer whose affairs you now handle, identify yourself as the fiduciary, check the box that describes how you got your authority (executor, administrator, guardian, trustee, or sole person in charge of an intestate estate), list the tax forms and years your authority covers, sign under penalties of perjury, attach the court document proving your appointment, and mail it to the IRS service center where the taxpayer files returns. The form has four parts, but a typical filer only completes Part I and Part IV. The authority granted comes from Internal Revenue Code Section 6903, which shifts the taxpayer’s tax rights and duties to you once the IRS processes the notice.
What to Gather Before You Open the Form
You’ll move faster if these are in front of you:
- The taxpayer’s full legal name, last known address, and identifying number. Use a Social Security Number or ITIN for an individual, or an Employer Identification Number for a trust, estate, or other entity. Write the name exactly as it appears on the taxpayer’s most recent return.
- Your own name, current mailing address, telephone number, and identifying number. Whatever address you list here is where the IRS will send every notice, bill, and refund check.
- Proof of authority. Executors and administrators need letters testamentary, letters of administration, or a court certificate. Trustees need the trust instrument. Guardians and conservators need the court order of appointment.
- The relevant date: date of death for an estate, or date of appointment (or date assets were transferred to the trust) for a guardianship, conservatorship, or trust.
If you’re acting for a decedent’s estate, the estate needs its own Employer Identification Number for estate tax filings; the decedent’s Social Security Number won’t work. You can apply free of charge on IRS.gov using Form SS-4.
Part I: Taxpayer and Fiduciary Information
The top of Part I asks for the taxpayer’s identifying details. Enter the name, identifying number, and last known address exactly as they appear on the most recent return. Below Section A, fill in your own name, address, and telephone number as the fiduciary. Confirm your address is current before you send the form. A wrong address here is the single most common way critical IRS mail ends up somewhere you can’t act on it.
Part I, Section A: Check the Right Authority Box
Section A is where you tell the IRS how you became the fiduciary. Check exactly one of lines 1a through 1e.
- Line 1a, testate estate. Use this if the decedent left a valid will and a court authorized you to serve as executor. Attach current letters testamentary or a court certificate. Enter the date of death on line 2a.
- Line 1b, intestate estate with court appointment. Use this if the decedent died without a valid will and a court appointed you as administrator. Attach letters of administration or a court certificate. Enter the date of death on line 2a.
- Line 1c, guardianship or conservatorship. Use this if a court appointed you as guardian, custodian, or conservator over another person’s interests. Enter your date of appointment on line 2b.
- Line 1d, intestate estate with no court appointment. Use this only if the decedent died without a will, no court-appointed administrator exists, and you are the sole person in charge of the decedent’s property. If anyone else is also handling the property, this line is not available to you, and you’ll need to go through a court appointment first. Enter the date of death on line 2a.
- Line 1e, trust. Use this if you were named trustee under a valid trust instrument. Enter your date of appointment or the date assets were transferred to the trust on line 2b.
Part I, Section B: Tax Types, Forms, and Periods
Section B tells the IRS which taxes your authority covers. Fill it in broadly rather than narrowly; a box you don’t check is a matter the IRS won’t recognize you on later.
Line 3 asks for the type of tax. Check every box that could apply: income, employment, excise, estate, gift, or other.
Line 4 asks for the specific federal tax form numbers. The choices printed on the form include:
- 706 series, estate tax returns
- 709, gift tax returns
- 940, 941, 943, and 944, employment tax returns
- 1040 or 1040-SR, individual income tax returns
- 1041, estate and trust income tax returns
- 1120, corporate income tax returns
- Other, for any form not listed (write it in)
For a typical decedent’s estate, you would check Form 1040 for the decedent’s final individual return, Form 1041 for the estate’s own income tax return, and Form 706 if the estate is large enough to owe federal estate tax.
Line 5 lets you limit your authority to specific tax periods. If your authority covers all years, leave line 5 blank. If it’s limited (say, to only 2025 and 2026), check the box and list those years.
Part IV: Signature
Sign and date the form under penalties of perjury. Enter a title describing your fiduciary role, such as executor, administrator, guardian, conservator, trustee, or personal representative. Your signature certifies that everything on the form is true and that you hold the legal authority you claim.
Parts II and III: When They Apply
Most first-time filers skip Parts II and III. Complete them only in these situations.
Part II is for terminating or revoking a fiduciary notice you filed earlier. It has three sections. Section A is for total revocation or termination when the fiduciary relationship is completely over. Section B is for partial revocation, where your authority is being reduced but not eliminated (for example, dropping employment tax authority while keeping income tax authority). Section C is for a substitute fiduciary taking your place; you provide the new fiduciary’s information, and that person still needs to file their own Form 56 to establish their own authority.
Part III applies only if a court appointed you as a receiver, trustee, or fiduciary in a proceeding that is not a bankruptcy case. This includes receiverships, foreclosure proceedings, and assignments for the benefit of creditors. Provide the details of the court proceeding, including dates, times, and locations of scheduled hearings, and attach a separate schedule if there are multiple dates. Assignees for the benefit of creditors also attach a brief description of the assets assigned and an explanation of what they plan to do with them, including any hearings, creditor meetings, or scheduled sales.
Bankruptcy trustees don’t use Form 56 to give notice of qualification. They follow the notice requirements in Title 11 of the United States Code instead.
Attachments and Where to Send It
Attach a copy of the court document that establishes your authority: letters testamentary, letters of administration, court certificate, or trust instrument. Without this proof, the IRS may reject or delay processing.
Mail the completed form to the IRS service center where the taxpayer is required to file their tax returns. If your authority covers multiple forms and one of them is Form 1040, use the center that handles the taxpayer’s 1040 based on their state of residence. The correct address appears in the instructions for whichever return the taxpayer files. Certified mail with return receipt gives you a dated record of when the IRS received the notice, which matters if timing is ever questioned.
Form 56 can also be filed electronically through the IRS Modernized e-File (MeF) platform, which authorized e-file providers use. A tax professional working in MeF-compatible software can transmit the form along with the related tax returns.
When to File
For executors, administrators, trustees, guardians, and conservators, there’s no fixed calendar deadline. File the form when the fiduciary relationship is created, meaning as soon as you can after your court appointment or after you take control of the assets. Every day of delay is a day IRS mail may go to the taxpayer’s old address, where you won’t see notices until penalties have built up.
One situation carries a hard 10-day deadline. If you’re appointed as a receiver in a receivership proceeding, an assignee for the benefit of creditors, or a similar court-appointed fiduciary in aid of foreclosure, you must file Form 56 within 10 days of your appointment. That filing goes to the Advisory Group Manager of the IRS area office with jurisdiction over the person you’re acting for, not to the usual service center.
What You’ve Taken On Once the IRS Accepts the Form
Once the IRS processes the form, you step into the taxpayer’s position for the taxes and periods you listed. You sign their returns, receive their refunds, respond to their audits, and owe the returns they owe. Filing Form 56 does not make you personally liable for the taxpayer’s tax debt out of your own pocket. Under Section 6903, taxes are collected from the taxpayer’s estate, not from your personal assets.
There is one exception worth knowing before you distribute anything. If the estate is insolvent and you pay other creditors or beneficiaries before federal tax debts, the IRS can hold you personally responsible up to the amount you distributed improperly. Federal tax obligations have priority over most other debts of an insolvent estate. Pay the IRS first when the estate can’t cover everything.
When your role ends, file a second Form 56 with Part II completed to close out the relationship. Until the IRS receives that termination notice, it can keep treating you as the responsible party, and notices, penalties, and demands will keep arriving at your address.