Three Ways Out of a Joint Tax Bill: Innocent Spouse, Separation of Liability and Equitable Relief

You signed a joint return. Now the IRS wants money, and the problem came from your spouse or former spouse. The good news is that Congress built an exit. The bad news is that it built three exits, each with its own door, its own key and its own rules. Pick the wrong one, or describe your facts the wrong way, and you can lose relief you were entitled to.

Why you owe in the first place

When married people file a joint return, Internal Revenue Code section 6013(d)(3) makes the liability joint and several. That is legal shorthand for a simple and brutal idea: the IRS can collect the entire tax, plus penalties and interest, from either spouse. It does not matter who earned the income. It does not matter who claimed the bad deduction. It does not matter what your divorce decree says.

Section 6015 is the release valve. It lets a spouse who filed a joint return ask to be relieved of some or all of that liability. The statute sets out three separate forms of relief, and the Treasury Regulations at 26 C.F.R. 1.6015-1 through 1.6015-9 fill in the details. You request all of them on the same form, Form 8857, Request for Innocent Spouse Relief.

Door one: innocent spouse relief under section 6015(b)

This is the classic version, and the one most people have heard of. Under section 6015(b)(1), you can be relieved of liability for an understatement of tax if all of these are true:

• A joint return was filed for the year.
• The return has an understatement of tax attributable to erroneous items of the other spouse.
• When you signed the return, you did not know, and had no reason to know, that there was an understatement.
• Taking into account all the facts and circumstances, it is inequitable to hold you liable.
• You elect relief no later than two years after the IRS began collection activities against you.

Two words carry most of the weight here: understatement and erroneous. An understatement means the IRS later found more tax than the return showed, usually from unreported income or a deduction that should not have been claimed. Treasury Regulation 1.6015-1(h)(4) defines an erroneous item as any item that results in an understatement because it was omitted from or improperly reported on the return.

Relief under 6015(b) can also be partial. If you knew about part of an item but not its full extent, section 6015(b)(2) relieves you of the part you did not know about. I cover the details in the guide to section 6015(b) requirements.

Door two: separation of liability under section 6015(c)

Separation of liability works differently. It does not ask whether it would be fair to hold you liable. It asks how the deficiency would be divided if each spouse had filed separately, and then it limits your liability to your share.

You are eligible to elect it under section 6015(c)(3)(A) only if, when you file the election, you are no longer married to the other spouse, you are legally separated, or you were not a member of the same household at any time during the 12 months ending on the date you file. Treasury Regulation 1.6015-3(a) also treats a widowed spouse as eligible.

The test that kills most separation of liability claims is actual knowledge. Under section 6015(c)(3)(C), if the IRS shows that you actually knew about an item when you signed the return, the election does not apply to that item. Notice the shift: the IRS carries the burden of proving actual knowledge, and Treasury Regulation 1.6015-3(c)(2) says it must prove it by a preponderance of the evidence. Reason to know is not enough. That makes 6015(c) more forgiving than 6015(b) for spouses who should have asked more questions but did not actually know.

The catch: section 6015(g)(3) says no refund is allowed as a result of a 6015(c) election. It only stops future collection. The full mechanics are in the guide to the separation of liability election.

Door three: equitable relief under section 6015(f)

Equitable relief is the catch-all. Under section 6015(f)(1), the IRS may relieve you of liability for any unpaid tax or any deficiency if, considering all the facts and circumstances, it is inequitable to hold you liable, and relief is not available under 6015(b) or (c).

That second condition matters. Equitable relief is only considered after the other two fail. But equitable relief reaches something the other two cannot touch: an underpayment. If your joint return correctly reported the tax but your spouse never paid it, there is no understatement, so 6015(b) and (c) do not apply. Equitable relief is the only path. The Form 8857 instructions say so directly.

The IRS decides equitable relief cases using Revenue Procedure 2013-34. It sets threshold conditions in section 4.01, a streamlined approval path in section 4.02, and a list of factors in section 4.03: marital status, economic hardship, knowledge or reason to know, legal obligation, significant benefit, compliance with the tax laws, and mental or physical health. The guide to section 6015(f) factors walks through each one.

Side by side

Here is the short version of how the three compare.

• What it covers. 6015(b) and 6015(c) cover understatements, meaning deficiencies. 6015(f) covers both understatements and unpaid tax that was properly reported.
• Marital status. 6015(b) and 6015(f) are available whether or not you are still married. 6015(c) requires divorce, legal separation, widowhood, or 12 months of living in separate households.
• Knowledge. 6015(b) fails if you knew or had reason to know. 6015(c) fails only for items the IRS proves you actually knew about. Under 6015(f), knowledge is one factor among several and does not decide the case by itself.
• Deadline. 6015(b) and 6015(c) must be elected within two years after the IRS begins collection activities against you. A 6015(f) request can be made any time before the collection statute expires for unpaid amounts, or within the refund period for amounts already paid, under section 6015(f)(2).
• Refunds. Available under 6015(b) and 6015(f), subject to limits. Not available under 6015(c).

You do not have to choose just one

Here is the part most people miss. Treasury Regulation 1.6015-1(a)(2) lets you submit a single claim electing relief under 6015(b) and 6015(c) and requesting relief under 6015(f). If you elect either (b) or (c), the IRS considers whether relief is appropriate under the other elective provision and then under (f).

But there is a trap in the reverse direction. The same regulation says that if you ask only for equitable relief, the IRS may not grant relief under (b) or (c) without an affirmative election. Form 8857 is structured to capture the facts for all three. Answer it completely, and do not narrow your own request.

How to think about which door fits

I start every spousal case with the same questions.

First, is the problem an understatement or an underpayment? If the tax was correctly reported and simply not paid, you are in 6015(f) territory, full stop.

Second, are you divorced, legally separated, widowed, or living apart for at least 12 months? If so, 6015(c) is on the table, and it is often the strongest option for a spouse who did not actually know about the item.

Third, what did you know when you signed? Under 6015(b), the IRS asks what a reasonable person in your position would have known. Under 6015(c), the IRS has to prove what you actually knew. Under 6015(f), knowledge is weighed alongside everything else, and abuse or financial control can flip the knowledge factor in your favor.

Fourth, have you paid any of this already? If you want money back, 6015(c) cannot get it for you.

Fifth, what is the clock doing? If the IRS has already sent a collection due process notice or offset one of your refunds, the two-year window for (b) and (c) may already be running. The guide to the two-year deadline explains what starts it.

The bottom line

Three doors. One form. The law lets you knock on all three at once, and you should. What wins these cases is not the form itself. It is a clear, documented story about who earned what, who controlled the money, what you were told, and why it would be unfair to make you pay. Get that story right the first time, because if the case goes to Tax Court, section 6015(e)(7) generally limits the court to the administrative record plus newly discovered or previously unavailable evidence.