Sun Country Airlines Pilot Financial Planning: 15% NEC 401(k), Minnesota Taxes, and What the Allegiant Acquisition Changes

Sun Country Airlines occupies an unusual position in U.S. airline pilot compensation: a leisure-focused ultra-low-cost carrier that, as of January 1, 2024, pays a 15% non-elective 401(k) contribution — no pilot contribution required to trigger it. That rate matches the largest mainline carriers and stands well above what most ULCC pilots receive. The catch is a geography problem that compounds over a career: Minneapolis/St. Paul is Sun Country's hub, and Minnesota's income tax reaches 7.85% at captain income levels — a burden that erodes a meaningful fraction of the 401(k) advantage before it gets invested. And starting May 13, 2026, a new layer of uncertainty sits on top of both: Allegiant Travel Company completed its acquisition of Sun Country, combining two carriers with structurally different 401(k) models under one corporate owner.¹

This guide covers what the 15% NEC actually means for your §415(c) math, why you have full deferral room at every Sun Country income level, the Minnesota domicile question and how to approach it, what the Allegiant JCBA negotiation puts at financial risk, and how to build a retirement plan that accounts for the integration uncertainty.

The §415(c) picture: no squeeze at any Sun Country income level

The IRS §415(c) limit caps total annual additions to a defined-contribution plan — employer contributions plus employee deferrals — at $72,000 in 2026. The §401(a)(17) limit caps compensation recognized for plan calculations at $360,000 in 2026.⁴

At mainline carriers where the NEC is 18% and captains earn $300,000–$500,000+, the employer deposit alone pushes into the bucket ceiling: $300,000 × 18% = $54,000, leaving only $18,000 for personal deferrals. At Sun Country, the math looks different. Even at the top of Sun Country's captain pay scale (~$270,000), the 15% NEC deposits $40,500 — leaving $31,500 of bucket room. Since the employee elective deferral limit is $24,500 in 2026 (below that $31,500 available room), every Sun Country pilot can contribute the full personal deferral at every income level without hitting the §415(c) ceiling.

Pay figures approximate, based on ALPA-published rates and salary aggregators; verify against your current CBA pay schedule. *Catch-up contributions sit outside the §415(c) annual additions limit per SECURE 2.0 §108 — they are not subject to the $72,000 ceiling. Sources: IRS Rev. Proc. 2025-40 (2026 limits); ALPA Sun Country pilot group data.⁴

The implication: at every income level up to the top of Sun Country's scale, your personal deferral room is fully available. Unlike colleagues at Delta or United who must prioritize among limited bucket space, Sun Country pilots can contribute the full $24,500 employee deferral on top of the 15% NEC without any planning constraint from §415(c). The annual total — $59,750 for a senior captain, up to $76,250 with super catch-up — is competitive with what mainline captains accumulate at the IRS ceiling.

Minnesota state income tax: the domicile question for MSP-based pilots

Sun Country's Minneapolis/St. Paul hub means the airline's pilots are disproportionately exposed to Minnesota's income tax — one of the highest in the country. For 2026, Minnesota's top marginal rate is 9.85%, applying to taxable income above $304,970 for married filing jointly. A senior captain household crossing that threshold with combined income pays 9.85% at the margin — roughly equivalent to eliminating three full months of 401(k) NEC contribution in state taxes alone.⁵

The 7.85% bracket below that threshold applies to income over approximately $182,000 MFJ, which captures most Sun Country captain households. Even at the 7.85% rate, a captain earning $235,000 owes roughly $18,400 in Minnesota income taxes on federal taxable income.

The federal law at 49 U.S.C. § 40116 protects airline pilots from being taxed by states where they work as nonresidents — Minnesota can only tax income you earn as a Minnesota resident (or income from Minnesota sources). This creates the domicile strategy that many MSP-based pilots explore.

At a Sun Country senior captain income of $235,000, moving from Minnesota (7.85% effective on the relevant bracket) to Texas or Florida saves approximately $15,000–$18,000 per year in state income taxes. Compounded over a 10-year captain career and invested in the 401(k) or taxable account, that annual savings has a present value in the six figures. The domicile decision is worth a serious analysis with a pilot-familiar tax advisor, not a casual judgment call.

The JCBA risk: what the Allegiant acquisition puts at stake

The structural difference between Sun Country's and Allegiant's retirement plans is significant — and it runs in Sun Country pilots' favor. Sun Country: 15% NEC, deposited unconditionally. Allegiant: match-based structure, roughly 10% company contribution only when pilots contribute 5% themselves. A pilot who contributes nothing at Allegiant receives nothing from the company. A pilot who contributes nothing at Sun Country still receives the full 15% NEC.⁶

When Allegiant completed the acquisition on May 13, 2026, the two pilot groups remained under separate CBAs. The path to a Joint Collective Bargaining Agreement follows a predictable sequence: National Mediation Board single carrier determination → Transition and Process Agreement between the two MECs → Seniority Merger Integration Committee → Integrated Seniority List → JCBA ratification. That timeline typically runs 2–5 years from acquisition close.¹

The financial risk for Sun Country pilots is that a negotiated JCBA — covering 1,100+ Sun Country pilots and 1,000+ Allegiant pilots — could move toward a unified retirement structure that is worse for Sun Country pilots than their current CBA. Several scenarios are possible:

• Maintain Sun Country NEC structure for the combined group. The best outcome for Sun Country pilots; would represent a meaningful cost increase for Allegiant. This is what the Sun Country ALPA MEC pushed for at close, emphasizing "crew commitments" in their May 2026 statement.
• Transition to a unified NEC below 15%. A compromise rate — say 12%–14% — could be the outcome that makes the numbers work for Allegiant management while improving over their current match-based structure.
• Transition to a unified match-based structure. The worst outcome for Sun Country pilots: the NEC guarantee disappears and pilots must contribute to receive company deposits. This would require Sun Country pilots who were receiving unconditional NEC contributions to change their contribution behavior entirely.

Nothing is determined yet. But Sun Country pilots whose retirement projections assume a 15% NEC at ages 55–65 should stress-test those projections against a downside scenario — for example, a 12% NEC match-based structure — and understand how much personal savings rate needs to increase to compensate. The Pilot Retirement-at-65 Gap Calculator can help you model that gap.

Roth strategy at Sun Country income levels

Because the 15% NEC does not crowd out your personal deferral room, Sun Country pilots can make deliberate Roth vs. Traditional decisions at each career stage without the constraint that forces mainline captains into pre-tax 401(k) contributions to stay under the §415(c) ceiling.

The 2026 Roth IRA phase-out for married filing jointly begins at $236,000 MAGI and phases out completely at $246,000.⁴ Your MAGI for this purpose is generally your W-2 wages minus pre-tax 401(k) deferrals and HSA contributions.

• First officer years ($70K–$140K): Direct Roth IRA contributions are fully available. Contribute $7,000 per year ($8,000 at 50+) directly to a Roth IRA on top of the 401(k). At a 22% federal bracket, you are locking in tax-free status on decades of compounding at a fraction of what a senior captain's Roth conversions cost. This is the highest-return move available at FO income.
• Junior captain ($165K–$200K): Confirm MAGI annually. With a $24,500 pre-tax 401(k) deferral and HSA contributions reducing MAGI, most junior captain households remain below the Roth phase-out — especially single filers or lower-income spouses. Direct Roth IRA contributions usually still available.
• Senior captain ($220K–$270K): MAGI after pre-tax deferrals is typically $195K–$245K. You may be approaching the phase-out depending on filing status and other income. Run the numbers each year. Once you are in the phase-out range, switch to the backdoor Roth: non-deductible traditional IRA contribution converted immediately. The pro-rata rule applies if you carry pre-tax IRA balances — if your pre-tax money is entirely inside the Sun Country 401(k) (not in rollover IRAs), the pro-rata trap does not apply.
• Roth 401(k) deferral option: If the Sun Country 401(k) plan offers a Roth 401(k) deferral option, FOs and junior captains in the 22%–24% federal bracket should generally elect Roth deferrals for their personal contribution. The 2026 mandatory Roth catch-up rule (SECURE 2.0 §603) requires pilots earning more than $150,000 in the prior year to make catch-up contributions in the Roth 401(k), not pre-tax — verify whether your plan has implemented this rule.

Loss-of-license disability: no DB pension backstop

With no defined-benefit pension, Sun Country pilots have no income floor if they lose their first-class medical. A DB pension annuity at least continues paying regardless of whether a pilot can fly. At Sun Country, the 401(k) balance is the entire retirement picture — and if a pilot loses their medical at age 50 with 15 remaining years to contribute, the retirement savings shortfall is severe.

Loss-of-license disability insurance is not optional for Sun Country pilots. The key issues:

• New hire 60-day enrollment window. Most carriers' group disability plans allow new hires to enroll in loss-of-license disability without medical underwriting during the first 60 days of employment. This window closes and does not reopen. It is the single most time-sensitive financial move in a pilot's career. See the Loss of Medical disability guide for what real loss-of-license coverage requires.
• Policy language matters more than the premium. Generic long-term disability (LTD) pays if you cannot perform "any occupation" — a standard that does not trigger when you can still work a desk job. True loss-of-license coverage pays when you lose the first-class medical certificate required to fly as a commercial pilot, regardless of other employment ability. Verify that your policy uses an "own-occupation pilot" or aviation-specific definition, not any-occupation language.
• Coverage gap math: A 45-year-old Sun Country captain at $235,000 has 20 years of career income remaining — approximately $4.7 million in pre-disability earnings. At $40,500 NEC per year over that period, the 401(k) accumulation impact is $810,000 in employer contributions alone (before investment growth). Coverage that falls short of this exposure is not adequate.

Use the Loss-of-License Coverage Calculator to estimate your specific monthly gap and total exposure.

Career planning in the post-acquisition environment

The Allegiant acquisition creates a genuine career decision for Sun Country pilots. The combined entity — currently marketing itself as the leading U.S. leisure carrier — operates out of Las Vegas (Allegiant) and Minneapolis (Sun Country). Several factors are worth weighing:

• Seniority position. Where Sun Country pilots land on the integrated seniority list determines their captain upgrade timeline and schedule access. Dovetail integration (the ALPA default principle) typically preserves relative date-of-hire standing, but the specific outcome depends on TPA negotiations. A favorable ISL result preserves years of accumulated seniority; an unfavorable result could delay captain upgrade and compress the remaining high-earnings window before mandatory retirement at 65.
• Equipment and base access. Allegiant operates an Airbus fleet from Las Vegas. Sun Country operates a 737/A320 mix from Minneapolis. Post-integration, access to equipment types and base cities will be governed by the combined seniority list. Pilots who want to fly from a low-tax state (Nevada — Las Vegas) over a high-tax state (Minnesota — Minneapolis) may find the geographic domicile benefit flows through equipment access.
• Mainline opportunities. Sun Country and Allegiant are ULCC/leisure carriers — not pathways to network mainline operations. Pilots who want to move to Delta, United, American, or a major cargo carrier should evaluate the timeline now, before JCBA negotiations lock the seniority list. Waiting until the ISL is signed may be too late to make the timing work before age 65.

Planning checklist for Sun Country pilots (2026)

1. Verify your 401(k) contribution election is set to at least $24,500 (full employee deferral limit) — the 15% NEC deposits unconditionally, but adding your personal deferral meaningfully increases annual accumulation.
2. Confirm loss-of-license disability coverage is in place and uses aviation-specific own-occupation language; check your coverage against the Calculator's output.
3. Analyze your Minnesota domicile situation honestly — if your schedule permits genuine relocation to a no-tax state, the 10-year present value of that tax savings often exceeds $150,000.
4. Stress-test your retirement projection against a JCBA downside scenario (12% match-based structure) and know what additional personal savings would be required to close that gap.
5. Decide on Roth vs. Traditional 401(k) deferral for your personal contribution — FOs and junior captains at 22%–24% bracket should generally elect Roth deferrals.
6. Run the Roth IRA eligibility check annually — MAGI after 401(k) deferral and HSA often keeps senior captains under the phase-out threshold, enabling direct contributions without backdoor mechanics.
7. Review beneficiary designations on the 401(k) — under ERISA §1055, a married participant's default beneficiary is their spouse. If your situation is more complex (prior marriage, children from a prior relationship, trust arrangements), review now rather than later.
8. Track JCBA negotiation developments through the Sun Country ALPA MEC. Contract terms set during this integration will govern your retirement benefits for 5–10 years.

Sources

1. ALPA: Sun Country Pilots Emphasize Importance of Crew Commitments as Airline Completes Financial Close with Allegiant Travel Company (May 2026) — confirms acquisition close date, JCBA pending NMB single carrier determination.
2. ALPA: Sun Country Airlines Pilot Group — confirms 15% NEC structure and excess-paid-directly provision. Verified against AirlinePilotCentral Sun Country data.
3. ALPA: Sun Country Pilots File to Open Contract Negotiations (August 2025) — confirms December 2025 amendable date and Section 6 filing.
4. IRS: Retirement Topics — 401(k) and Profit-Sharing Plan Contribution Limits — §415(c) $72,000 limit, employee deferral $24,500, catch-up $8,000/$11,250, Roth IRA MFJ phase-out $236,000–$246,000 for 2026. Per IRS Rev. Proc. 2025-40.
5. Minnesota Department of Revenue: 2026 Income Tax Brackets, Standard Deduction and Dependent Exemption Amounts — 9.85% rate threshold $304,970 MFJ; 7.85% bracket above ~$182,000 MFJ; values verified December 2025.
6. Pilot Advisor Match: Allegiant Air Pilot Financial Planning Guide — Allegiant match-based structure (10% company match requires 5% pilot contribution) for comparison.

Tax values and contribution limits verified against IRS and Minnesota DOR sources for tax year 2026. CBA contribution rates reflect ALPA-published data as of mid-2026; verify current rates with the Sun Country ALPA MEC or plan administrator before making contribution decisions.