Spouses live apart in different states, one of which is Arizona (a community property state). Wife cannot get income information from the husband, so wife cannot complete Form 8958.
How does the wife file the return?
The IRS will disregard community property laws under certain circumstances. IRS Pub 555 Community Property discusses this - see the section titled "Community Property Laws Disregarded". There is a 5 part test to determine if a spouse can be relieved from liability arising from community property law. To request relief under this rule, it says to see Pub 971 Innocent Spouse Relief.
Pub 971 has a section titled "Community Property Laws". It lists the same 5 part test listed in Pub 555, but provides a little more explanation. The 4th prong of the test requires you to establish that you did not know of, and had no reason to know of, the community property you are trying keep out of your income tax return. It then goes on to explain what constitutes knowledge of the community property. It says not knowing the specific amount of income is not a basis for relief if you are aware of the source of income or income the income-producing activity.
The wife knows the husband had two jobs, but doesn't have any wage or withholding information from those jobs and cannot get the information from her husband.
HOW DOES THE FILE THE RETURN?