Q: You've maxed the Solo 401(k) at $76.5K and your $400K+ consulting income means you're leaving six-figures of tax-deferred shelter on the table each year. A cash-balance defined-benefit plan can shelter $150K–$265K/yr on top of the Solo 401(k) cap — but the setup is operationally complex. Where do you start?
A: For a $400K+ solo consultant at age 50+, the cash-balance DB plan is the only retirement shelter vehicle that provides actuarially certified contribution capacity above the $76.5K Solo 401(k) flat cap. The §415(b)(2)(B) age-indexed annual-benefit cap at age 50 is ~$170K; at age 55 it's ~$210K; at age 62 it's $265K (Rev. Proc. 2025-61). At a 37% marginal rate, every $100K of additional deferred shelter saves ~$37K in federal income tax per year. The actuarial cost of $2K–$8K/yr is amortised over the shelter differential in the first year. The setup requires an enrolled actuary, a written plan document, and IRS Form 5500-EZ monitoring — this checklist walks through each step.
Section 1 — Actuarial Cost Trade-Offs vs Solo 401(k)
The fundamental economics of the cash-balance DB plan decision hinge on the actuarial cost amortising over the shelter differential:
| Cost Item | Solo 401(k) | Cash-Balance DB Plan |
|---|---|---|
| Annual retirement shelter | $76.5K (§415(c) cap at age 50+) | $150K–$265K/yr (§415(b)(2)(B) age-indexed) |
| Annual admin / actuarial cost | $50–$300/yr (provider fee only) | $2K–$8K/yr (enrolled actuary) |
| Form 5500 filing | Form 5500-EZ if assets >$250K | Form 5500-EZ (one-participant) or Form 5500-SP |
| Annual valuation required? | No | Yes — AV-1/AV-2/AV-3 (ERISA §104(b)(4)) |
| Roth available? | Yes (§402A, SECURE 2.0 §109) | No — fully employer-funded under §404(a)(1) |
| Deduction deadline | Extended due date (Oct 15) | Extended due date (Oct 15) — same |
Worked example — $400K sole-prop at age 55: Net SE income $400K. Solo 401(k): $76.5K shelter ($69K + $7.5K catch-up). Cash-balance DB plan at age 55: §415(b)(2)(B) cap ~$210K actuarial annual benefit. Less actuarial cost of $6K/yr. Net additional shelter vs Solo 401(k) alone: $210K − $76.5K − $6K = ~$127K/yr additional. At 37% marginal rate: ~$47K/yr of additional deferred federal income tax. Payback on actuarial cost: $6K / $47K = 1.5 months. For a consultant with a 5-year horizon, this represents ~$235K of deferred tax over 5 years. Source: IRC §§ 415(b)(2)(B), 415(c), 404(a)(1); Rev. Proc. 2025-61.
The $2K–$8K actuarial cost breakdown: basic single-participant cash-balance plan with standard §412(i) fully-insured accrual targeting $150K/yr = $2K–$3K/yr. Intermediate with age-62+ accrual targeting $200K–$265K/yr = $4K–$6K/yr. Complex with §415(b)(2)(B) coordination + §415(f) DB/DC stacking + §401(a)(4) nondiscrimination testing = $6K–$15K/yr. For a solo one-participant consultant with no employees, $2K–$5K/yr is the normal actuarial cost range.
Section 2 — Age-Based Breakeven Analysis
The §415(b)(2)(B) age-indexed cap rises with age and is the primary driver of the DB plan's advantage at older ages. The breakeven matrix below compares the net annual shelter differential (DB plan contribution − Solo 401(k) cap − actuarial cost) across age and income bands:
| Age | §415(b)(2)(B) DB Cap | Net $200K Income | Net $300K Income | Net $400K Income | Net $500K Income |
|---|---|---|---|---|---|
| <50 | ~$125K | DB plan edge: ~$45K (weak) | DB plan edge: ~$45K | DB plan edge: ~$45K | DB plan edge: ~$45K |
| 50+ | ~$170K | DB plan edge: ~$90K | DB plan edge: ~$90K | DB plan edge: ~$90K | DB plan edge: ~$90K |
| 55+ | ~$210K | DB plan edge: ~$130K | DB plan edge: ~$130K (STRONG) | DB plan edge: ~$130K (STRONG) | DB plan edge: ~$130K (STRONG) |
| 62+ | $265K | DB plan edge: ~$185K | DB plan edge: ~$185K (DOMINATES) | DB plan edge: ~$185K (DOMINATES) | DB plan edge: ~$185K (DOMINATES) |
Notes: Edge = §415(b)(2)(B) DB cap − $76.5K Solo 401(k) cap − $5K median actuarial cost. All figures are approximate and depend on the enrolled actuary's actuarial equivalence factors and the specific plan design. The §415(b)(2)(B) cap is indexed annually; Rev. Proc. 2025-61 sets the 2026 figures. Income must be sufficient to fund the full actuarial contribution — at $200K net income, the full age-55 $210K DB contribution is not achievable (IRC §404(a)(1) deduction is limited to net SE income). Source: IRC §§ 415(b)(2)(B), 404(a)(1); Rev. Proc. 2025-61.
Important income constraint: The IRC §404(a)(1) deduction is capped at the actuarial cost of funding the annual benefit, but this is further limited by the employer's net earnings from self-employment. A $400K net sole-prop income can generally fund the full age-55 DB contribution of ~$210K. A $200K net income cannot fully fund the age-62 $265K cap — the enrolled actuary will size the contribution to stay within §404(a)(1) limits. The Checklist includes an income-band × age matrix for practical sizing. Source: IRC §§ 404(a)(1), 415(b)(2)(B).
Section 3 — IRS Form 5500-EZ vs Form 5500-SP Filing Requirements
Understanding when you must file and which form determines whether you face penalties and whether your actuary needs to attach the AV-1/AV-2/AV-3 valuation report:
| Situation | Filing Requirement | Due Date | Penalty Regime |
|---|---|---|---|
| One-participant plan; assets ≤ $250K at 12/31 | No filing required | N/A | N/A |
| One-participant plan; assets > $250K at 12/31 | Form 5500-EZ (annually) | July 31 of following year | $250/day (no max stated; DFVCP caps at $1,500/late return) |
| Two or more participants (any asset level) | Form 5500-SP (annually) | July 31 of following year | $250/day (ERISA §502(c)(2)) |
| §412(i) fully-insured plan (any size) | Form 5500-EZ or 5500-SP + AV attachment | July 31 of following year | Same as above |
The $250K threshold is static — it has not been indexed since enactment. For a solo consultant contributing $150K–$265K in year 1, plan assets may cross $250K in year 1 or year 2 depending on investment returns. The enrolled actuary should flag when this threshold is approaching. The DFVCP (Delinquent Filer Voluntary Correction Program) allows late filers to cap their penalty at $1,500 per late return — use DFVCP rather than paying full daily penalties on a late-discovered filing obligation.
One-participant plans also have a special Form 5500-EZ extension mechanism: Form 5558 extends the due date by 2.5 months (to October 15 when filed on time). For a calendar plan year 2026, the normal Form 5500-EZ due date is July 31, 2027; with Form 5558 the extended due date is October 15, 2027. Source: ERISA §104(b)(4); 29 U.S.C. §1024(b); ERISA Reg. §2520.104-46; Form 5500-EZ instructions.
Section 4 — 6-Step Setup Checklist
The enrolled actuary must hold the EA-2 credential from the Joint Board for the Enrollment of Actuaries (JBEA). Find via ASPPA (asppa.org) or SOA (soa.org) directories. Vetting criteria: (a) AV-1/AV-2/AV-3 valuation series experience; (b) cash-balance plan specialisation (not only traditional DB); (c) fee quote in the $2K–$8K range for a one-participant solo plan; (d) confirm they will prepare or review the Form 5500-EZ package annually. Timing: engage the actuary before plan year start (ideally Q3 of the year BEFORE the first plan year). The actuary will design the benefit formula, size the first-year contribution within §404(a)(1) limits, and produce the AV-1 preliminary valuation. Source: IRC §412(i); ERISA §103(a)(4); JBEA EA-2 requirements.
Cash-balance plan: hypothetical account balance; employer contributes an annual "pay credit" plus an "interest credit" (based on a benchmark rate — typically 30-year Treasury rate or fixed rate). More flexible for variable income years. Better suited for consultants whose income fluctuates. §412(i) fully-insured plan: funded exclusively through insurance and annuity contracts with an insurance carrier; benefit is guaranteed by the carrier. Fixed annual premium = less flexibility but more predictability. The actuary will recommend based on your income stability and plan horizon. The $199 Checklist includes a comparison worksheet. Source: IRC §412(i); Treas. Reg. §1.412(i)-1.
The plan document must be adopted by 12/31 of the first plan year (IRC §401(b) remedial amendment period). Two paths: (a) IRS pre-approved prototype — many major pension TPA firms and some insurance carriers offer pre-approved cash-balance prototypes (IRS opinion letter issued under Rev. Proc. 2017-41). Faster, lower legal cost ($500–$2K). (b) Individually designed plan — allows maximum flexibility; requires IRS determination letter submission. Plan document must specify: benefit formula (pay credit rate + interest credit rate), vesting schedule (100% immediate for one-participant plans), funding method (§412 minimum funding standard), and Form 5500-EZ filing acknowledgment. Source: IRC §§ 401(a), 401(b); Rev. Proc. 2017-41.
The first-year actuarial contribution is deductible under IRC §404(a)(1) by the extended due date of your tax return — typically October 15 of the following year for a Form 1040 with extension. The actuary certifies the minimum required contribution under §412 and the maximum deductible contribution under §404(a)(1). Fund by check or wire to the plan's trust account (a separate brokerage account at Fidelity, Schwab, or Vanguard under the plan's EIN). Do NOT commingle plan assets with personal or business accounts — this triggers a prohibited transaction under ERISA §406. Source: IRC §§ 404(a)(1), 412; ERISA §406.
Track plan assets at each December 31. The first year assets exceed $250K, Form 5500-EZ becomes mandatory. The actuary typically prepares or assists with Form 5500-EZ preparation. Key data: plan name, EIN, plan year, total assets at year-end, total contributions. The AV-1 actuarial valuation is attached for §412(i) plans. Form 5500-EZ is due July 31 following the plan year. File Form 5558 (extension) by July 31 for a 2.5-month extension if needed. Never miss the filing — DFVCP penalties ($1,500/late return) are significantly less than daily penalties ($250/day) but require proactive correction filing. Source: ERISA §104(b)(4); Form 5500-EZ instructions; IRS DFVCP program.
Each year, the enrolled actuary produces the AV-2 (funded status valuation) and certifies the §412(i) AFTAP (Adjusted Funding Target Attainment Percentage). The AFTAP determines whether benefit restrictions apply under IRC §436 (restrictions trigger if AFTAP < 80%). For a well-funded one-participant plan with regular contributions, the AFTAP should remain above 100%. The actuary also sizes the following year's required contribution and maximum deductible contribution. Annual valuation cycle: December 31 balance → actuary produces AV-2 by February → contribution sizing by March → fund by October 15 extended due date → Form 5500-EZ by July 31. Source: IRC §§ 412, 436; ERISA §303(h); AV-1/AV-2/AV-3 actuarial valuation series.
Section 5 — Finding a Qualified Enrolled Actuary
The enrolled actuary is the single most critical vendor relationship for the cash-balance DB plan. The wrong actuary — overpriced, inexperienced with cash-balance plans, or unfamiliar with one-participant plan nuances — creates compliance risk and unnecessary cost. Here is a systematic vetting process:
Credential Verification
- Confirm the EA-2 credential from the Joint Board for the Enrollment of Actuaries (JBEA). The JBEA publishes a public directory of enrolled actuaries at irs.gov/tax-professionals/enrolled-actuaries. The credential renews every 3 years with 24 hours of CPE.
- Ask for their ASPPA (American Society of Pension Professionals and Actuaries) membership number. ASPPA members with the MSPA (Member, Society of Pension Actuaries) designation have passed additional credentialing requirements specific to pension plans.
- For §412(i) fully-insured plans specifically, ask if they have experience with the insurance carrier coordination (Allmerica, Penn Mutual, John Hancock — carriers that issue §412(i)-compliant annuity contracts).
Vetting Questions to Ask
- "Can you provide a sample AV-1 preliminary valuation for a one-participant cash-balance plan at a $200K annual benefit target?" A qualified actuary should be able to provide a sanitized example.
- "What is your annual fee for a solo one-participant cash-balance plan with an annual benefit target of $150K–$200K?" Answer should be $2K–$5K/yr. Quotes below $1.5K suggest inexperience; above $8K for a solo plan may indicate over-engineering.
- "Do you also prepare or review the Form 5500-EZ?" Many actuaries include this; some charge separately ($500–$1K additional). Confirm the scope.
- "Have you set up cash-balance plans for solo consultants with $300K–$500K income?" The consultant income profile has specific §415(b)(2)(B) sizing requirements — confirm direct experience.
Red Flags
- Quote dramatically below $2K/yr for a one-participant plan — likely a templated "DB plan" that is not a true cash-balance plan or lacks the required AV-1/AV-2/AV-3 valuation depth.
- Cannot explain the §415(b)(2)(B) age-indexed cap mechanic — foundational to sizing the annual benefit target.
- Unfamiliar with the AFTAP (§436) certification requirement — this is a compliance requirement, not optional.
- Pushes a §419A "welfare benefit fund" alongside the DB plan — these are separate vehicles and cannot be commingled with DB plan funding (IRC §§ 419, 419A commingling prohibition).
Where to find actuaries: ASPPA member directory at asppa.org (filter by state + pension specialty + enrolled actuary credential). SOA member directory at soa.org (filter for Pension/Retirement track). NIPA (National Institute of Pension Administrators) at nipa.org for smaller-plan specialists. LinkedIn search for "enrolled actuary cash balance plan" in your metro area. Many CPAs who specialize in high-income self-employed clients maintain a preferred actuary referral network — ask your CPA first.
Section 6 — What the $199 Checklist Delivers vs the Free Comparison Guide
The free DB Pension vs Solo 401(k) comparison guide gives the strategic math: §415(b)(2)(B) age-indexed cap tables, actuarial cost amortisation across income bands, the 6-row decision-tree by age and income, and §415(f) DB/DC stacking analysis. It answers WHAT to decide.
The $199 Cash-Balance DB Plan Setup Checklist is the operational runbook — the implementation manual that pairs with the comparison guide. It delivers:
- 6-step setup sequence with timing — exact dates, deadlines, and sequencing for the first plan year
- Enrolled-actuary vetting templates — the 8-question vetting script, red-flag list, fee range benchmarks, and ASPPA/SOA/NIPA directory navigation
- Plan document adoption checklist — pre-approved prototype vs individually designed comparison, adoption resolution template
- Form 5500-EZ filing walkthrough — line-by-line instructions, the $250K threshold monitoring schedule, Form 5558 extension procedure, DFVCP correction path
- Annual valuation renewal calendar — 12-month cycle with the AV-1/AV-2/AV-3 delivery dates, AFTAP certification timing, and contribution sizing deadlines
- IRC citations for every step — §§ 412(i), 415(b)(2)(B), 404(a)(1), 415(f), 436; ERISA §§ 104(b)(4), 303(h); Rev. Proc. 2025-61
- Income-band × age breakeven matrix — expanded 6×4 matrix with net-of-actuarial-cost figures at $200K/$300K/$400K/$500K × age 45/50/55/62
- 30-day money-back guarantee
Frequently Asked Questions
The free DB vs Solo 401(k) guide at /guides/defined-benefit-pension-vs-solo-401k-consultants-2026 gives the strategic math: §415(b)(2)(B) age-indexed cap, actuarial cost amortisation across income bands, decision-tree by income and age, and §415(f) stacking analysis. The $199 Cash-Balance DB Plan Setup Checklist is the operational runbook: the 6-step setup sequence with timing, the enrolled-actuary vetting criteria (EA-2 credential, AV-1/AV-2/AV-3 valuation series, fee range $2K–$8K, red flags), IRS Form 5500-EZ vs Form 5500-SP filing walkthrough with the $250K asset threshold and penalty regime, plan document adoption checklist (pre-approved prototype vs individually designed), and the annual valuation renewal cycle. The free guide tells you WHAT to decide; the $199 Checklist tells you HOW to execute.
A Solo 401(k) has zero actuarial cost — provider account fee only ($50–$300/yr). A cash-balance DB plan requires an annual actuarial valuation certificate under IRC §412(i) for fully-insured accrual qualification. The actuarial cost ranges $2K–$8K/yr: basic single-participant cash-balance plan $2K–$3K/yr; age-62+ accrual targeting $200K–$265K/yr $4K–$6K/yr. At age 50+ on $400K net income, the DB plan shelters $150K–$265K/yr vs the Solo 401(k) cap of $76.5K — a $75K–$190K/yr net shelter differential. After subtracting $5K/yr median actuarial cost, the NET benefit is $70K–$185K/yr. At a 37% marginal rate, that represents $26K–$68K/yr of additional deferred taxes. The actuarial cost amortises in under 2 months of shelter differential for any consultant over age 50 on $400K+ net income. Source: IRC §§ 412(i), 404(a)(1), 415(b)(2)(B); Rev. Proc. 2025-61.
Rule of thumb: age 50+ / $300K+ net income / 5+ year horizon where the DB plan DOMINATES. The §415(b)(2)(B) cap at age 50 is ~$170K; at age 55 ~$210K; at age 62 $265K (Rev. Proc. 2025-61). At age 50+ on $300K+ income, the DB plan provides $90K–$130K+ more annual shelter than the Solo 401(k) net of actuarial cost. Below age 45 OR below $200K net income, the Solo 401(k) wins because the actuarial cost is not amortised over a short enough horizon. The expanded 6×4 breakeven matrix with net-of-actuarial-cost figures is in the $199 Checklist. Source: IRC §§ 415(b)(2)(B), 415(c); Rev. Proc. 2025-61.
ONE-PARTICIPANT plans: Form 5500-EZ is required annually when plan assets at December 31 exceed $250,000 (static threshold, not indexed). Below $250K assets: no filing required. Form 5500-EZ is due July 31 of the following plan year (July 31, 2027 for calendar plan year 2026). The DFVCP (Delinquent Filer Voluntary Correction Program) caps late penalties at $1,500 per late return — use DFVCP rather than paying the $250/day general penalty for a missed filing. TWO OR MORE PARTICIPANTS: Form 5500-SP is required regardless of asset level. The actuarial valuation AV-1/AV-2/AV-3 is attached to Form 5500-EZ for fully-insured §412(i) plans. Source: ERISA §104(b)(4); 29 U.S.C. §1024(b); ERISA Reg. §2520.104-46; Form 5500-EZ instructions.
Step 1: Engage enrolled actuary (EA-2 credential, ASPPA/SOA directory). Step 2: Choose cash-balance vs §412(i) fully-insured plan type. Step 3: Adopt written plan document (pre-approved prototype or individually designed; by 12/31 of first plan year). Step 4: Fund initial actuarial contribution under IRC §404(a)(1) by extended due date (Oct 15). Step 5: Set up Form 5500-EZ monitoring — track December 31 assets; file when assets exceed $250K by July 31. Step 6: Annual actuarial valuation renewal — AV-2 funded status, AFTAP certification, following-year contribution sizing. Source: IRC §§ 412(i), 415(b)(2)(B), 404(a)(1); ERISA §104(b)(4).
Find enrolled actuaries with the EA-2 credential via: ASPPA member directory at asppa.org (filter for 'enrolled actuary' + 'cash-balance plan' specialisation); SOA member directory at soa.org (filter for pension actuaries); NIPA at nipa.org for smaller-plan specialists; your CPA's preferred actuary referral. Vetting: confirm EA-2 credential is current (JBEA renews every 3 years); ask for a sample AV-1 valuation; confirm cash-balance plan specialisation; get a fee quote ($2K–$8K/yr for one-participant solo plans). Red flags: quote below $1.5K/yr, cannot explain §415(b)(2)(B) age-indexed cap, unfamiliar with AFTAP certification. Source: JBEA EA-2 requirements; ERISA §103(a)(4); IRC §412(i); ASPPA.org; SOA.org.
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The operational runbook for $400K+ solo consultants who have maxed the Solo 401(k) cap and are ready to set up a cash-balance defined-benefit plan. 6-step setup sequence, enrolled-actuary vetting templates, Form 5500-EZ walkthrough, and annual valuation renewal calendar. 30-day money-back guarantee.
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