MFS vs MFJ When Your Spouse Is German: The 6013(g) Decision

As of tax year 2025: an American married to a German national has three plausible US filing statuses (Married Filing Separately (MFS), Married Filing Jointly (MFJ) via the Internal Revenue Code (IRC) § 6013(g) election, and Head of Household (HOH) under IRC § 7703(b)), and the choice matters more than generic expat-tax guides admit. Samira and I have been filing as a binational couple since we married, and the active-duty-to-retiree transition in January 2025 changed our income mix in a way that made me revisit the math from scratch [primary-source: Ryan + Samira binational filing since marriage; military retirement transition January 2025].

This is for US citizens married to German nationals working out their IRS filing status: retired military, contractors, and long-term civilians in Germany, plus active-duty service members at Ramstein and across the KMC who have married or will marry a German national and need to see the pre- and post-retirement implications. The phrase MFS vs MFJ German spouse taxes is the search the rest of the internet does not answer well, especially for first-year filers and anyone whose income mix shifted (PCS, retirement, civilian transition).

MFS vs MFJ German spouse taxes: your default is Married Filing Separately, here is what that means

IRS Publication 519 (the residency-rules pub) sets the rule plainly: a nonresident alien generally cannot file jointly, but an NRA married to a US citizen or resident may choose to be treated as a resident and file a joint return. That choice is the IRC § 6013(g) election, covered in the next section.^[1]

What MFS costs you: a $15,000 standard deduction for 2025 vs $30,000 MFJ,^[2] harsher IRA, student-loan, and Roth phase-outs, brackets above 12 percent that mirror single-filer brackets (not half of MFJ), and MFS-half-of-MFJ thresholds for the Net Investment Income Tax.

What MFS keeps clean: Samira’s German salary, interest, and rental income stay outside the US tax system entirely. They do not appear on my 1040, do not affect my AGI, and do not trigger FBAR (FinCEN Form 114) or FATCA (Form 8938) reporting on my return for accounts held in her name only. MFS takes the German spouse out of the US tax system. That is often what people actually want.

The Internal Revenue Code § 6013(g) election: what you get and what you give up

What you give up:

• Samira’s worldwide income comes onto our US return. Once the election is made, both spouses are treated as US residents for income-tax purposes for the year of the election and all future years until the election is terminated or suspended.^[4]
• Treaty benefits go away for the spouse-as-resident. IRS Publication 54 (the abroad-citizens pub) is explicit: neither spouse can claim under any tax treaty not to be a US resident for a tax year for which the choice is in effect.^[4]
• FBAR (FinCEN Form 114) and FATCA (Form 8938) reach into Samira’s accounts. Aggregate $10,000 across foreign accounts triggers FBAR.^[5]
• The election is sticky. Per 26 CFR § 1.6013-6(a)(1) it stays in effect for all subsequent years until terminated or suspended. Once revoked, the same couple cannot make the election again under IRC § 6013(g)(5). This is distinct from IRC § 6013(h), the separate dual-status-year election available only when the NRA spouse becomes a US resident on their own facts.

How the § 6013(g) election interacts with the Foreign Earned Income Exclusion and the Foreign Tax Credit

IRS Publication 54 sets the constraint: once you have made a § 911 exclusion election on a category of income, you cannot take a Foreign Tax Credit or deduction for foreign taxes on that same excluded income in the same year.^[4] The election is also sticky: switch from FEIE to FTC on the same income in a later year, and the FEIE is treated as revoked for that year.

The trap is the stacking rule. If Samira earns the equivalent of $145,000 and I earn $90,000 from US sources, claiming FEIE on her German salary does NOT mean my $90,000 is taxed in the lowest brackets. The Form 2555 worksheet stacks the excluded amount underneath, so my $90,000 starts where her excluded income ends. Her income still drives my marginal rate.

The stacking-rule trap: Excluded foreign income stacks underneath your US income on the Form 2555 worksheet. Your US-source income starts where her excluded income ends. Her income still drives your marginal rate.

The cleaner path for a German-resident binational couple electing § 6013(g) is usually FTC-only on Samira’s German salary: report her German Brutto (gross salary before tax and deductions), claim the Foreign Tax Credit (IRC § 901, Form 1116) for the German income tax she paid, let the FTC offset US tax. Germany’s high effective rates almost always produce enough credit to wipe out US tax on her foreign income, leaving carryovers for future use.

If you have been on FEIE for years and switch to FTC after electing MFJ, you have revoked your FEIE and need IRS approval to re-elect within 5 years.^[4]

For a full walkthrough of the Form 2555 worksheets and the bona fide residence test, see our US admin guides.

Three situations where Married Filing Jointly with the § 6013(g) election is clearly better

These are the three income configurations where the MFS vs MFJ German spouse taxes math resolves clearly in favor of the IRC § 6013(g) election.

Scenario 1: One earner, one not-or-low earner. If I have meaningful US-source income (military retirement, US contractor salary, US investment income) and Samira’s German income is low (student, parental leave, part-time), the election gives us the MFJ deduction and brackets without much downside. Her low German income is sheltered by the Foreign Earned Income Exclusion (IRC § 911) or wiped by the Foreign Tax Credit (IRC § 901, Form 1116).

Scenario 2: We have a US-citizen child and want the refundable Additional Child Tax Credit. Publication 54 is explicit that an active § 911 exclusion election blocks the additional child tax credit in the same year.^[4] Switching to MFJ + FTC-only preserves the ACTC and the broader bracket when the child has a US SSN.

Scenario 3: Roth IRA contribution capacity. The MFS Roth phase-out runs from $0 to $10,000 MAGI: effectively no Roth contributions if you live with your spouse. MFJ raises that to $236,000 to $246,000 for 2025.^[7]

The MFS vs MFJ German spouse taxes decision depends on three variables: her income level, her asset profile, and whether there is a qualifying child.

Three situations where Married Filing Separately is clearly better

These are the three configurations where the MFS vs MFJ German spouse taxes math resolves in favor of staying at MFS.

Scenario 1: Samira earns substantially more than the FEIE cap. If her German Brutto is well over $130,000 and mine is moderate, MFJ pulls her entire German income onto our US return; the remainder above the FEIE cap stacks for bracket purposes. NIIT (above $250,000 AGI MFJ) starts biting. The breakeven sits anywhere from €130,000 to €180,000 of German income depending on the US-source mix.

Scenario 2: Samira holds German investment, real estate, or business assets. Riester-Rente (a German state-subsidized pension plan), Bausparvertrag (a building-society savings contract), Fondspolicen (fund-linked insurance wrappers), and any GmbH stake become PFIC issues (Form 8621), foreign-trust reporting (Form 3520 / 3520-A), or controlled-foreign-corporation problems (Form 5471) under IRC § 6013(g). Compliance cost often exceeds tax savings.

Scenario 3: Active duty in Germany on FEIE. Active-duty US military pay is US-government wages, sourced to the US, so the Foreign Earned Income Exclusion on the US salary is not available. But Samira’s German salary IS FEIE-eligible. Electing MFJ adds her income, lets her FEIE it, and lands inside the stacking-rule trap. This was our pattern during the active-duty years [primary-source: Ryan + Samira filing pattern during active-duty years 2018-2024, US-source military pay only on Ryan’s MFS return].

Head of Household: the third option Americans overlook

IRS Publication 54 puts the rule in plain terms: if you do not choose to treat your nonresident-alien spouse as a US resident, you may use Head of Household, provided you pay more than half the cost of maintaining a household for a qualifying dependent or relative other than your nonresident alien spouse.^[4] IRS Publication 519 corroborates: a US citizen married to an NRA can be considered unmarried for HOH purposes if there is a qualifying person other than the spouse.^[1]

In practice: with a qualifying child (US-citizen child with SSN, lived with me more than half the year, I paid more than half the cost of keeping up a home), I can file as HOH instead of MFS. The 2025 HOH standard deduction is $22,500 (vs $15,000 MFS, $30,000 MFJ) and HOH brackets are wider than MFS.^[2] Run it as a third scenario when Samira’s German income is high enough that IRC § 6013(g) hurts and there is a qualifying child with a US SSN.

Making the § 6013(g) election: the signed statement, ITIN, and first-year mechanics

The statement contains a declaration that the election is being made, name and address and SSN/ITIN of each spouse, and both signatures. Mechanically:

1. Get an Individual Taxpayer Identification Number (ITIN) for Samira if she has no SSN. File Form W-7 with the joint return; allow 7 to 11 weeks.
2. Draft the § 6013(g) statement. A short signed page declaring the election, naming both spouses with SSN/ITIN, and stating that Samira was an NRA and I was a US citizen on December 31 of the election year and we elect to be treated as US residents for the entire year.
3. File Form 1040 jointly with Form 2555 (FEIE) or Form 1116 (FTC). Attach FBAR (FinCEN Form 114) electronically if any foreign account aggregate exceeds $10,000; attach FATCA (Form 8938) if applicable.
4. Send the joint return with the Form W-7 packet to the Austin TX ITIN unit, not your usual service center.

Most-failed step: send the joint return with the Form W-7 packet to the Austin TX ITIN unit, not your usual service center. Mailing to a regional center causes delays of months while the package is rerouted.

Why this decision is harder in a US-Germany household specifically

Factor 1: Ehegattensplitting on the German side already optimizes the joint position. Germany’s Ehegattensplitting (the joint income-splitting mechanism) via Zusammenveranlagung (joint tax assessment) under § 26 EStG (Einkommensteuergesetz, the German Income Tax Act) is the default for married couples and produces a strong joint-filing benefit when one spouse earns substantially more than the other.^[8] We already get the German joint-filing benefit. Electing IRC § 6013(g) does not stack a US joint-filing benefit on top of it for free; it adds compliance and exposes her income to US tax.

Factor 2: The treaty saving clause neutralizes most “use the treaty to push back” arguments. The IRC § 6013(g) election makes Samira a US resident for tax purposes, putting her inside the saving clause. Treasury’s regulatory example walks through the consequence: an electing NRA spouse may remain a treaty-resident of her home country under a tiebreaker, but the saving clause means the US still taxes her worldwide income.^[3]

If you are reasoning from the US-Germany treaty itself, note that the 2006 Protocol moved Social Security taxation from Art. 19(2) to Art. 18(5); cite the current article. Because the IRS posts the treaty text only as image-only scanned PDFs,^[9] the saving-clause principle from IRS Publication 54 is the operative rule for citation purposes.

U.S. treaties contain saving clauses that provide that the treaties do not affect the U.S. taxation of its own citizens and residents. As a result, U.S. citizens and residents cannot generally use the treaty to reduce their U.S. tax liability.

IRS Publication 54^[4]

That is the saving clause, stated in IRS Publication 54.^[4]

Factor 3: German effective tax rates almost always make the FTC-only path win on Samira’s income. German income tax plus Solidaritätszuschlag (the solidarity surcharge) on a Steuerklasse (tax class) III/V or IV/IV middle-income salary comfortably exceeds the US MFJ rate, so the Foreign Tax Credit (IRC § 901, Form 1116) produces excess credit (carryover) rather than residual US tax. Electing IRC § 6013(g) and going FTC-only on Samira’s income usually does not cost extra US tax. It just costs the compliance burden.

The US-Germany decision is rarely “the election saves us thousands.” It is more often “the election simplifies our filing for a small US tax saving in exchange for a real compliance cost.” Whether that trade is worth it depends on Samira’s account profile, our investment plans, and whether we have a US-citizen child whose ACTC or education credit eligibility depends on it. For the family-benefit side of that question, see Kindergeld for an American-German Family, and for the German residency paperwork that runs alongside the tax questions, see Anmeldung in Germany: the 14-Day Rule.

Common Misconceptions vs. What the Regulations Actually Say

The conversations I have had with other Americans married to German nationals repeat the same mistaken framings. Each one below is something I have personally heard or read in expat-tax forums, paired with what the regulations actually say.

• “MFJ is always cheaper, just elect 6013(g).”
  Not when the German spouse’s income is high. Internal Revenue Code § 6013(g) makes the NRA spouse a US tax resident on her worldwide income; her German salary, interest, dividends, and rental income come onto the US return. Above the FEIE cap (IRC § 911, $130,000 for 2025) the bracket math reverses and the higher MFJ standard deduction does not offset the broader tax base. Real breakeven sits between €130,000 and €180,000 depending on US-source mix.
• “My German spouse needs an SSN to file MFJ.”
  An Individual Taxpayer Identification Number (ITIN) works. File Form W-7 with the joint return. The W-7 packet (with the § 6013(g) statement and the joint 1040) goes to the Austin TX ITIN unit, not your usual service center.
• “Filing MFJ via 6013(g) is a one-year decision.”
  It is binding for all future years until terminated or suspended. 26 CFR § 1.6013-6(a)(1) makes the election apply to all subsequent years; IRC § 6013(g)(4) lists the four termination triggers (revocation, death, separation, IRS termination for inadequate records).
• “Once I revoke 6013(g), I can re-elect later if our situation changes.”
  No. Internal Revenue Code § 6013(g)(5) prohibits a second election by the same couple. Revocation is one-shot. If you revoke and Samira becomes a higher earner later, you cannot re-enter MFJ via IRC § 6013(g) again. The only path back is IRC § 6013(h), the separate dual-status-year election available only when the NRA spouse becomes a US resident on her own facts.
• “The Foreign Earned Income Exclusion will exclude my spouse’s full German salary.”
  The Foreign Earned Income Exclusion (FEIE, IRC § 911) caps at $130,000 per qualifying spouse in 2025 and applies only to foreign earned income (wages, salary, self-employment). It does not cover dividends, interest, rental income, capital gains, or pension income. Anything above the cap or outside the earned-income definition lands on the US return at the stacked marginal rate.
• “Head of Household works because my spouse lives in Germany separate from me.”
  Geographic separation alone does not qualify. Internal Revenue Code § 7703(b) (the “considered unmarried” special rule) requires a qualifying child or other qualifying person, that you paid more than half the cost of maintaining their home, and that the home was your principal residence for more than half the year. Without a qualifying person other than the NRA spouse, you cannot file HOH; you remain MFS by default.
• “I can file as Single because my German spouse has no US obligation.”
  No. You are married. The only options for a US citizen married to a German national are MFS, MFJ via IRC § 6013(g) (or IRC § 6013(h)), or HOH if IRC § 7703(b) is satisfied. “Single” is not an option for a married US filer regardless of where the spouse lives or whether the spouse has US filing obligations.
• “My German spouse is not subject to US filing under 6013(g) because she’s German.”
  Once IRC § 6013(g) is elected, both spouses are treated as US tax residents on worldwide income for the year of election and all subsequent years until termination (26 CFR § 1.6013-6(a)(1)). Her German citizenship and German residency do not exempt her from the US filing reach the election creates.
• “My spouse only has FBAR responsibility if she signs the MFJ return.”
  FBAR (FinCEN Form 114) under 31 USC § 5314 runs on financial-account ownership and signature authority by a US person, not on filing status. Once IRC § 6013(g) makes Samira a US person for income-tax purposes, Treasury has historically treated her as in scope for FBAR on her own German accounts as well. Filing MFS keeps her out of US-person status entirely.
• “The Foreign Tax Credit fully cancels my US tax on her German salary.”
  The Foreign Tax Credit (FTC, IRC § 901, Form 1116) is limited per income basket and capped at the US tax that would otherwise apply to that foreign-source income. On a Steuerklasse III/V or IV/IV middle-income German salary the German effective rate usually exceeds the US rate and the FTC produces excess credit (carryover). At the high end, with US-source investment income on top, residual US tax can remain even after FTC.
• “Active-duty military pay qualifies for the Foreign Earned Income Exclusion if I’m stationed in Germany.”
  It does not. Active-duty US military pay is US-government wages, sourced to the United States under IRC § 911(b)(1)(B)(ii), and is not foreign earned income regardless of where the service member is physically located. Civilian-contractor wages earned abroad after retirement are FEIE-eligible; the active-duty paycheck is not.
• “German Riester-Rente and Bausparvertrag are tax-free in the US because they’re tax-favored in Germany.”
  Once IRC § 6013(g) brings Samira’s accounts into US scope, German tax-favored vehicles get reclassified under US rules. Riester-Rente, Fondspolicen, and similar wrappers often become PFICs (Form 8621) or foreign trusts (Form 3520 / 3520-A). Compliance cost on these forms commonly exceeds the tax benefit of joint filing.

Sources

1. IRS Publication 519 (US Tax Guide for Aliens), https://www.irs.gov/publications/p519 (retrieved 2026-05-14).
2. IRS Publication 17 (Your Federal Income Tax), https://www.irs.gov/forms-pubs/about-publication-17 (retrieved 2026-05-14).
3. 26 CFR § 1.6013-6 (Election to treat nonresident alien individual as US resident), https://www.law.cornell.edu/cfr/text/26/1.6013-6 (retrieved 2026-05-14).
4. IRS Publication 54 (Tax Guide for US Citizens and Resident Aliens Abroad), https://www.irs.gov/publications/p54 (retrieved 2026-05-14).
5. IRS FBAR Reference Guide (Report of Foreign Bank and Financial Accounts), https://www.irs.gov/businesses/small-businesses-self-employed/report-of-foreign-bank-and-financial-accounts-fbar (retrieved 2026-05-14).
6. IRS Instructions for Form 2555 (Foreign Earned Income Exclusion), https://www.irs.gov/instructions/i2555 (retrieved 2026-05-14).
7. IRS Newsroom, “401(k) limit increases to $23,500 for 2025, IRA limit remains $7,000,” https://www.irs.gov/newsroom/401k-limit-increases-to-23500-for-2025-ira-limit-remains-7000 (retrieved 2026-05-14).
8. Wikipedia DE, “Ehegattensplitting” (overview of § 26 EStG joint-assessment mechanics), https://de.wikipedia.org/wiki/Ehegattensplitting (retrieved 2026-05-14).
9. IRS Tax Treaties A to Z, https://www.irs.gov/businesses/international-businesses/united-states-income-tax-treaties-a-to-z (retrieved 2026-05-14).

For most American-German households, MFS vs MFJ German spouse taxes comes down to whether the IRC § 6013(g) election unlocks more than it costs. This post is the filing-status-only walkthrough.