Section 6015(b): The Five Requirements for Classic Innocent Spouse Relief

Classic innocent spouse relief is the oldest and best-known form of spousal relief in the tax code. It is also the hardest to win, because it asks a question most spouses cannot answer cleanly: should you have known? If you can satisfy all five requirements of Internal Revenue Code section 6015(b), the law relieves you of the tax, interest and penalties tied to your spouse's errors. Miss one, and this door closes. That is why you should understand each requirement before you file.

The statute in plain English

Section 6015(b)(1) says that you are relieved of liability for tax, including interest and penalties, to the extent the liability is attributable to an understatement, if:

1. A joint return was made for the taxable year.
2. On that return there is an understatement of tax attributable to erroneous items of one individual filing the joint return.
3. The other individual establishes that in signing the return, he or she did not know, and had no reason to know, that there was such an understatement.
4. Taking into account all the facts and circumstances, it is inequitable to hold the other individual liable for the deficiency attributable to the understatement.
5. The other individual elects relief no later than two years after the date the IRS has begun collection activities with respect to that individual.

Treasury Regulation 1.6015-2(a) restates the same test. Let me take them one at a time.

Requirement one: a joint return

This sounds obvious, and usually it is. But not always. A return is joint only if it was validly made as a joint return. If you never signed it and never intended to file jointly, there may be no joint return at all, which is a different and sometimes better argument. If you signed under duress, Treasury Regulation 1.6013-4(d) says the return is not a joint return as to you. I cover both situations in the guide to returns signed under duress.

If you did file jointly, you are in. Move on.

Requirement two: an understatement from your spouse's erroneous items

Section 6015(b)(3) borrows the definition of understatement from section 6662(d)(2)(A). In practical terms, it is the amount by which the correct tax exceeds the tax shown on the return. The Form 8857 instructions give a simple example: a joint return shows $5,000 of tax, the IRS later finds $10,000 of income the former spouse earned and did not report, the total tax becomes $6,500, and the understatement is $1,500.

The understatement has to come from erroneous items of your spouse. Treasury Regulation 1.6015-1(h)(4) defines an erroneous item as any item resulting in an understatement because it was omitted from, or improperly reported on, the return. The regulation gives examples: unreported income from an investment asset, ordinary income improperly reported as capital gain, and a deduction for an expense that is personal in nature. Penalties and interest are not erroneous items. They follow the underlying items.

Here is the limit that surprises people. Section 6015(b) does not reach an underpayment. If your joint return correctly reported $20,000 of tax and your spouse promised to pay it and never did, there is no understatement. You need equitable relief for unpaid tax instead.

And the items must belong to your spouse. If the deficiency comes from your own unreported wages, 6015(b) does not help you with that part.

Requirement three: you did not know and had no reason to know

This is where most 6015(b) claims are won or lost. The standard is not just what you actually knew. Treasury Regulation 1.6015-2(c) says you have knowledge or reason to know if you actually knew of the understatement, or if a reasonable person in similar circumstances would have known of it.

The regulation lists the facts the IRS considers:

• The nature of the erroneous item and its amount relative to other items.
• The couple's financial situation.
• Your educational background and business experience.
• How much you participated in the activity that produced the erroneous item.
• Whether you failed to ask, at or before signing, about items on the return or omitted from it that a reasonable person would question.
• Whether the item was a departure from a recurring pattern in prior years' returns.

That fifth point is the one I see used against spouses most often. The IRS does not let you close your eyes and sign. If something on the return would have made a reasonable person ask a question, and you did not ask, that cuts against you. The full analysis is in the guide to the knew or reason to know standard.

Partial relief when you knew some of it

The law does not make this all or nothing. Section 6015(b)(2) provides apportioned relief: if you knew there was an understatement but did not know, and had no reason to know, its extent, you are relieved of the portion you did not know about.

Treasury Regulation 1.6015-2(e) gives a sharp example. A husband embezzled $2 million and kept it in his own account, but transferred $10,000 a month into the joint account, which the wife used to pay household bills and for which she received statements. She had reason to know of the $120,000 that passed through the joint account. She did not have reason to know of the other $1,880,000. Result: relief for the liability tied to $1,880,000, no relief for the $120,000.

That example shows how these cases are actually decided. Not on vague impressions. On money trails.

Requirement four: it would be inequitable to hold you liable

Even if you meet the first three requirements, the IRS still asks whether it is unfair to make you pay. Treasury Regulation 1.6015-2(d) says all the facts and circumstances are considered, and it highlights one factor: whether you significantly benefited, directly or indirectly, from the understatement. A significant benefit is any benefit in excess of normal support.

The regulation adds that other factors may be considered, including whether you were deserted by your spouse, whether you are divorced or separated, and whether you received a benefit on the return from the understatement. It also points to IRS published guidance for the criteria. Today that guidance is Revenue Procedure 2013-34, whose equitable factors overlap heavily with this inquiry. The guide to the significant benefit factor explains what counts as normal support and what does not.

Requirement five: elect within two years of collection activity

The statute requires the election no later than two years after the IRS begins collection activities against you. Treasury Regulation 1.6015-5(b)(2) defines collection activity narrowly: a section 6330 notice of intent to levy, an offset of your overpayment under section 6402, a collection suit against you, or a claim filed by the United States in a court proceeding involving you or your property. It expressly excludes a notice of deficiency, the filing of a notice of federal tax lien, and a demand for payment.

So a bill in the mail does not start the clock. A refund offset or a levy notice does. Read the guide to the two-year deadline before you assume you have time.

How 6015(b) relief actually helps you

If you qualify, section 6015(b)(1) relieves you of liability for tax, including interest, penalties and other amounts, for the year to the extent the liability is attributable to the understatement. Your spouse stays liable. The IRS can still collect from your spouse. It just cannot collect that portion from you.

Refunds can be available too. Section 6015(g)(1) allows a credit or refund to the extent attributable to the application of section 6015, subject to the refund limitation rules in section 6511 and the other exceptions in that subsection. The guide to innocent spouse refunds covers what you can recover and how to prove you paid with your own money.

Where 6015(b) fits in a real case

In my experience, pure 6015(b) cases are rarer than people think, because the reason to know standard is demanding. The more common pattern is this: a spouse who is divorced or separated qualifies for separation of liability under 6015(c), where the IRS must prove actual knowledge, and 6015(b) is claimed alongside it as a backstop. When the problem is an unpaid balance rather than a deficiency, 6015(b) is not in play at all.

That is why you should never file a request that asks for only one kind of relief. Form 8857 is built to collect facts for all three. Answer every question. Attach what proves your answers. And be honest about what you knew, because the IRS will ask your spouse too.