Mixed-Status Household

SSN and ITIN: Filing Status Elections Under Section 6013

A US citizen or resident alien with an SSN can file Married Filing Jointly with a spouse who has an ITIN. Under Section 6013(a), the election to file jointly requires both spouses to include their worldwide income on the return. The non-resident spouse must agree to be taxed as a US resident for the tax year (Section 6013(g) election).

This election is almost always beneficial. MFJ provides wider tax brackets, a higher standard deduction ($30,000 vs $15,000 for MFS in 2026), and access to credits that are reduced or eliminated under Married Filing Separately (MFS). The trade-off is that both spouses report worldwide income, and both are jointly and severally liable for the tax on the joint return.

To file jointly, the ITIN spouse must have a valid ITIN. ITINs expire if not used on a federal return for three consecutive years. If the ITIN has expired, file Form W-7 (Application for IRS Individual Taxpayer Identification Number) with the tax return. Processing takes 7-11 weeks. You can file the return with the expired ITIN and the IRS will process the W-7 renewal and the return together.

MFS is sometimes chosen to protect the SSN spouse from joint liability on income that is difficult to verify (for example, self-employment income from the ITIN spouse that is paid in cash). But MFS eliminates the EITC entirely and reduces most credits. The joint liability concern is better addressed through injured spouse relief (Form 8379) or innocent spouse relief (Form 8857) if needed later.

An SSN holder and an ITIN holder can file a joint federal tax return. The ITIN spouse must report worldwide income and agree to be taxed as a US resident for the year. (IRC Section 6013(a); IRC Section 6013(g); Form W-7 instructions)

Child Tax Credit: SSN Required Per Child, ITIN Gets $500 ODC Only

The Child Tax Credit ($2,000 per qualifying child in 2026) requires each child to have a valid Social Security number issued before the return's due date (including extensions). This is not the filer's SSN -- it is the child's SSN specifically. Children with ITINs do not qualify for the CTC.

However, an ITIN child who meets all other dependency tests qualifies for the $500 Other Dependent Credit (ODC). The ODC is nonrefundable -- it can reduce your tax to zero but does not generate a refund. The CTC is partially refundable (up to $1,700 as the Additional Child Tax Credit in 2026).

In a mixed-status family with some SSN children and some ITIN children, you claim the CTC for the SSN children and the ODC for the ITIN children. For example, a family with 2 SSN children and 1 ITIN child claims $4,000 CTC + $500 ODC = $4,500 in credits.

US-born children of undocumented parents automatically have SSNs (they are US citizens) and qualify for the full CTC claimed on the parent's return, regardless of the parent's immigration status. The parent files using their ITIN. This is one of the most commonly misunderstood rules -- the child's SSN, not the parent's, determines CTC eligibility.

The $2,000 Child Tax Credit requires the child to have an SSN. ITIN children get the $500 Other Dependent Credit instead. US-born children of ITIN parents qualify for the full CTC. (IRC Section 24(e) (SSN requirement); IRC Section 24(h)(4)(A) (ODC); Tax Cuts and Jobs Act Section 11022)

Earned Income Tax Credit: SSN Required for Everyone

The EITC is the most restrictive major credit regarding taxpayer identification. To claim the EITC, the filer (and spouse, if filing jointly) AND each qualifying child used to calculate the EITC must have valid Social Security numbers that authorise work. ITINs do not qualify at the federal level. An SSN issued with the restriction 'Not Valid for Employment' does not qualify either.

This means that in a household where one spouse has an SSN and the other has an ITIN, the couple cannot claim the EITC if they file jointly. Filing MFS to allow the SSN spouse to claim the EITC does not work either -- the EITC is completely disallowed for MFS filers.

However, twelve states and the District of Columbia have enacted state-level ITIN EITC programs as of 2026. These programs provide a state earned income credit to ITIN filers, often matching a percentage of the federal EITC that would have applied. The states are: California (CalEITC), Colorado, Connecticut, Illinois, Maine, Maryland, Minnesota, New Jersey, New Mexico, Oregon, Washington, and the District of Columbia. Eligibility rules and credit amounts vary by state.

For California specifically, the CalEITC is available to ITIN filers with earned income below approximately $30,950 (2026), with a maximum credit of approximately $3,500 for three or more children. This is significant: a family that gets zero federal EITC because of ITIN status can receive thousands in state credits.

The federal EITC requires SSNs for the filer, spouse, and each qualifying child. Twelve states offer ITIN EITC programs that provide state-level credits. (IRC Section 32(c)(1)(E) (SSN requirement); IRC Section 32(d) (MFS prohibition); Cal. Rev. & Tax Code Section 17052.1 (CalEITC))

Self-Employment with an ITIN: Pay In, No Benefits Out

Self-employment tax (15.3% -- 12.4% Social Security + 2.9% Medicare) applies to anyone with net self-employment income of $400 or more, regardless of immigration status. If you have an ITIN and earn $25,000 from a cleaning business, you owe approximately $3,533 in self-employment tax.

The structural inequity: ITIN filers pay into the Social Security system but are generally ineligible to receive Social Security benefits (retirement, disability, or survivor benefits) without a valid SSN and sufficient work credits. There is no refund mechanism for the Social Security taxes paid under an ITIN.

The Medicare portion is similarly one-directional in practice, though ITIN filers may be eligible for emergency Medicaid regardless.

Despite this, filing and paying self-employment tax is critically important for mixed-status families. A consistent filing history demonstrates tax compliance, which can be relevant in future immigration proceedings (adjustment of status, waiver applications, cancellation of removal). The tax record itself is protected by Section 6103, but the fact of having filed -- which you can demonstrate without revealing the return's contents -- can be evidence of good moral character.

For income tax purposes, the standard deductions and tax brackets apply normally to ITIN filers. The deductible half of self-employment tax (Section 164(f)) reduces AGI. Estimated tax payments are due quarterly on Schedule SE income, just as for SSN filers.

ITIN filers owe self-employment tax on earnings but generally cannot collect Social Security benefits. Filing history matters for immigration proceedings. (IRC Section 1401 (SE tax); IRC Section 164(f); 42 USC Section 402 (benefit eligibility))

Section 6103: The IRS Cannot Share Your Information with Immigration

Section 6103 of the Internal Revenue Code is the statutory firewall between the IRS and all other government agencies, including Immigration and Customs Enforcement (ICE), Customs and Border Protection (CBP), and US Citizenship and Immigration Services (USCIS). Under Section 6103, tax return information is confidential and cannot be disclosed except as specifically authorised by statute.

There is no authorisation in the Code for the IRS to share return information with immigration enforcement agencies for purposes of immigration enforcement. The IRS has confirmed this position repeatedly in public statements and internal guidance.

What this means practically: filing a tax return with an ITIN does not put you at risk of immigration enforcement action based on the return. The IRS cannot tell ICE that you filed, what address you used, what income you reported, or anything else from your return. This protection applies regardless of your immigration status.

There are narrow exceptions to Section 6103 -- for example, the IRS can disclose return information in response to a federal grand jury subpoena, or for tax administration purposes within the IRS. But immigration enforcement is not among the authorised disclosures.

Form 8379 (Injured Spouse Allocation) is relevant when one spouse has an SSN and the other has an ITIN, and the SSN spouse has a refund that could be offset by the ITIN spouse's debts (or vice versa). Filing Form 8379 protects the injured spouse's share of the refund from offset.

The IRS is legally prohibited from sharing your tax return information with immigration authorities. Filing with an ITIN does not create immigration enforcement risk from the tax return itself. (IRC Section 6103(a); IRC Section 6103(b)(2); IRC Section 7431 (civil damages for unauthorized disclosure))

Child and Dependent Care Credit: ITIN Dependents Accepted

The Child and Dependent Care Credit (CDCC) under Section 21 has more flexible identification requirements than the CTC or EITC. The qualifying individual (child or dependent) can have either an SSN or an ITIN. The filer (and spouse) must have earned income, but the identification number requirement for the filer is met by either SSN or ITIN.

The CDCC provides a credit of 20-35% of qualifying childcare expenses up to $3,000 for one child or $6,000 for two or more children. The credit percentage decreases as AGI increases, reaching the 20% floor at $43,000 AGI.

For a mixed-status family paying for childcare so both parents can work, this credit is available regardless of which family members have SSNs versus ITINs. The childcare provider must have a valid TIN (SSN or EIN), which means the provider must be a legitimate, tax-reporting business or individual.

This is one of the most underutilised credits in mixed-status households because families assume that ITIN status disqualifies them from all credits. It does not. The CDCC is available, and for a family paying $6,000+ in childcare for two children, the credit is $1,200 at the 20% rate.

The Child and Dependent Care Credit accepts ITIN dependents and ITIN filers. Both SSN and ITIN families can claim up to 35% of qualifying childcare expenses. (IRC Section 21; IRC Section 21(e)(1) (earned income requirement); IRS Publication 503)