MFT 31 Separate Assessment: Notices, Payment, and Collection

An MFT 31 separate assessment is an internal IRS bookkeeping move that mirrors a joint tax liability onto an individual module tied to one spouse. It doesn’t change what either of you owes. Under federal law, both spouses on a joint return remain liable for the full balance. What the split does is let the IRS handle payments, legal protections, and collection timelines for each spouse on separate tracks, which becomes necessary when one spouse files bankruptcy, requests innocent spouse relief, enters an installment agreement, submits an Offer in Compromise, or asks for a Collection Due Process hearing.¹

You Still Owe the Full Balance

The most important thing to understand up front: the split is administrative. Under the Internal Revenue Code, liability on a joint return is joint and several, meaning the IRS can collect the entire amount from either spouse regardless of who earned the income or caused the balance due.² Seeing an MFT 31 notice with your name and your share of the balance can create the impression that the debt has been divided. It hasn’t. If your spouse doesn’t pay their mirrored module, the IRS can still come after you for the full amount unless you separately qualify for relief.

A joint income tax account normally sits under the MFT 30 designation. When the IRS mirrors it, the dollar amount carries over to an MFT 31 module for each spouse (adjusted for payments and credits already applied), and from that point forward, activity on one module doesn’t automatically post to the other.¹

Why the IRS Split Your Account

The agency creates an MFT 31 module when treating both spouses identically on a single account becomes impractical. Common triggers:

One spouse files bankruptcy. The automatic stay bars collection against that spouse, so the IRS mirrors the account to keep pursuing the non-filing spouse without violating the stay.³
One spouse submits an Offer in Compromise. A separate module lets the IRS evaluate and track that settlement proposal independently.
The IRS grants innocent spouse relief on Form 8857. The relieved spouse’s share is separated out; the balance stays with the other spouse.³
One spouse sets up an installment agreement. The payment terms attach to that individual’s module and don’t bind the other spouse.¹
One spouse requests a Collection Due Process hearing. The split confines the hearing and any resulting stay to that person.
An audit or Tax Court decision changes what one spouse owes, and separate modules are needed to reflect the correct amount for each.

Reading the Notice and Pulling the Right Transcript

MFT 31 notices use the same formats as standard joint account notices and will show a “1040” tax type even though the underlying module is MFT 31.¹ The balance shown may differ from the original joint figure because payments, credits, or offsets have already been applied to one side or the other.

To see what’s actually happening on your individual module, request a Tax Account Transcript specifically for MFT 31. A standard transcript for the joint return (MFT 30) won’t show it. On the MFT 31 transcript, three transaction codes matter most:

TC 300 is an additional tax assessment posted to your module.
TC 520 is a litigation or CDP freeze, meaning collection is paused on that account. A two-digit closing code next to it identifies the type of proceeding.⁴
TC 706 is an overpayment credit transferred to your module from the joint account.

Compare the MFT 31 balance against your original Form 1040 for that tax year. Penalties and interest should track the dates and amounts on your individual module, not the joint one. Discrepancies are common and easier to fix if you catch them early.

Paying Without Misrouting the Money

Getting a payment to the right module matters more here than with a normal tax bill. Money that lands on the wrong account can take months to move.

Online Account

The IRS directs each spouse to pay through their own Online Account at irs.gov. Log in under your own name and Social Security number and pay from there.³ The IRS specifically warns against using Direct Pay under the primary filer’s name to pay the secondary spouse’s MFT 31 balance, because the system won’t route it correctly.⁵

Check or Money Order

Write on the check: “MFT 31 separate assessment,” the Social Security number of the spouse who owes the separate balance (not the primary filer’s if different), the tax year, and the form number (typically “1040”). Include the notice voucher if one was provided.⁵ Mail it to the address on your specific notice, not a general service center address. Certified mail with a return receipt gives you a paper trail.

EFTPS

EFTPS can process individual tax payments when the account is registered under the correct Social Security number, but the IRS’s primary guidance for MFT 31 payments points to the Online Account and check options. If you use EFTPS, confirm with the IRS that the payment will post to your MFT 31 module rather than the joint MFT 30 account.

Your Collection Deadline May Now Differ From Your Spouse’s

The IRS generally has 10 years from the date of assessment to collect a tax debt.⁶ That clock is the Collection Statute Expiration Date, or CSED. Once MFT 31 modules exist, each spouse’s CSED can run on its own timeline because certain actions pause the clock only for the spouse who took them.

Bankruptcy pauses the CSED for the filing spouse during the proceedings; the other spouse’s clock keeps ticking. An Offer in Compromise and a CDP hearing likewise suspend only the requesting spouse’s CSED.⁷ The IRS flags which spouse is affected with indicators on its system: “P” for primary, “S” for secondary, “B” for both. Practically, if your spouse’s bankruptcy pauses their CSED for three years, the IRS could still be collecting from them long after your own window has closed. Knowing your individual CSED is critical to deciding whether to pay, negotiate, or wait it out.

Your Options to Resolve the Balance

Because the module is yours, you can pursue resolution without your spouse’s participation:

Pay in full. This resolves your module and, because liability is joint and several, also reduces what the IRS can collect from your spouse on the same debt.
Installment agreement. Set up a monthly plan on your MFT 31 balance. Your spouse isn’t bound by the same terms.
Offer in Compromise. Submit Form 656 proposing a settlement based on your individual financial picture, not your spouse’s.
Currently Not Collectible status. If you can’t afford any payment, the IRS may pause active collection. The debt doesn’t disappear and penalties and interest keep accruing, but the IRS won’t levy wages or bank accounts while the status is in place.
Innocent spouse relief. If you qualify, Form 8857 can remove your liability for tax attributable to your spouse’s errors on the return.⁸

An installment agreement and an Offer in Compromise both extend the CSED by suspending it while the application is pending, which gives the IRS more time to collect if the arrangement later falls through. Paying in full and qualifying for innocent spouse relief are the only paths that actually eliminate the balance rather than managing it over time.

If the IRS files a lien or sends notice of intent to levy on your MFT 31 balance, you have 30 days from the date of that notice to request a Collection Due Process hearing on Form 12153.⁹ A timely CDP request pauses levy action, preserves your right to Tax Court review, and gives you a forum to propose an installment agreement or Offer in Compromise.

Innocent Spouse Relief vs. Injured Spouse Allocation

These two forms come up constantly in MFT 31 situations, and confusing them sends people down the wrong path.

Innocent spouse relief (Form 8857) is for situations where your spouse understated the tax on a joint return and you didn’t know. To qualify, you must have filed jointly, the tax must have been understated because of your spouse’s errors, and you must show you had no knowledge of the problem when you signed.¹⁰ A related option, separation of liability relief, is available if you’re divorced, legally separated, or haven’t lived with your spouse for at least 12 months before requesting relief; it allocates the understated tax based on who caused it.⁸ Both must be requested within two years of receiving an IRS notice of audit or taxes due because of the error.¹¹ A grant of relief is one of the events that triggers an MFT 31 split.

Injured spouse allocation (Form 8379) solves a different problem entirely. It applies when your share of a joint refund gets seized to pay your spouse’s separate past-due debts like child support, student loans, or back taxes from a prior year. Form 8379 asks the IRS to return your portion of the refund.¹² It does not create an MFT 31 module. If your real problem is that your spouse’s errors on the return created the tax debt, Form 8379 won’t help; Form 8857 is the right tool.

1
Internal Revenue Service. IRM 21.6.8 Split Spousal Assessments
2
Office of the Law Revision Counsel. 26 USC 6013 – Joint Returns of Income Tax by Husband and Wife
3
Internal Revenue Service. Spouses Filing Together May Owe Separate Amounts
4
Internal Revenue Service. IRM 25.3.8 TC 520 – W Freeze Servicewide Guide
5
Internal Revenue Service. Direct Pay Help
6
Office of the Law Revision Counsel. 26 USC 6502 – Collection After Assessment
7
Internal Revenue Service. IRM 5.1.19 Collection Statute Expiration
8
Internal Revenue Service. Separation of Liability Relief
9
Internal Revenue Service. Collection Due Process (CDP) FAQs
10
Internal Revenue Service. Tax Relief for Spouses
11
Internal Revenue Service. Innocent Spouse Relief
12
Internal Revenue Service. Instructions for Form 8379 – Injured Spouse Allocation