Retirement Planning for NJ Small Business Owners

SEP-IRA, Solo 401(k), SIMPLE IRA, and defined benefit plans, with the NJ tax nuances that most CPAs miss.

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Quick Answer

NJ does not allow IRA deductions on the NJ-1040 - SEP-IRA and traditional IRA contributions reduce federal AGI but not NJ taxable income, making Solo 401(k) employer contributions the better NJ choice.
2026 Solo 401(k) contribution limits: $24,500 employee deferral + employer match up to 25% of W-2 compensation, total cap of $72,000 - plus $7,500 catch-up if age 50+ or $11,250 enhanced catch-up if age 60–63.
Solo 401(k) plans must be established by December 31 of the tax year - SEP-IRAs can be established and funded up to the tax filing deadline including extensions (October 15 for calendar-year filers).
Cash balance (defined benefit) plans allow contributions of $100,000–$300,000+ per year for high earners - ideal for physicians, attorneys, and business owners age 45+ who want to rapidly reduce taxable income.
The Roth Solo 401(k) option allows after-tax contributions with tax-free growth and withdrawals - NJ taxes Roth contributions as income in the year contributed, but qualified distributions are NJ-tax-free in retirement.

Retirement plan services for NJ self-employed individuals and small business owners include plan selection analysis (SEP-IRA vs. Solo 401(k) vs. SIMPLE IRA vs. defined benefit), NJ-specific tax treatment review, contribution optimization, and plan setup coordination. This service covers retirement plan analysis for S-corp owners, LLC members, sole proprietors, and partnerships in New Jersey.

Choosing the wrong retirement plan costs NJ small business owners thousands of dollars a year, not just in taxes, but in missed contribution opportunities. The right plan depends on your income level, whether you have employees, your entity structure, and critically, how NJ treats each plan type on your state return.

This service covers S-corp owners, self-employed individuals, LLC members, and small business owners selecting, modeling, and setting up the right retirement plan. A thorough tax analysis supports an informed decision, rather than defaulting to whatever a broker recommends.

**The NJ difference most CPAs miss:** New Jersey does not allow IRA deductions on the NJ-1040 (Line 27a). This means SEP-IRA and traditional IRA contributions reduce your federal AGI but not your NJ taxable income. Solo 401(k) employer contributions, however, are generally deductible for NJ purposes. For NJ taxpayers in the higher brackets, this difference can mean $3,000–$7,000 in additional NJ state tax savings, simply by choosing Solo 401(k) over SEP-IRA.

**2026 contribution limits:** Solo 401(k): $72,000 total ($24,500 employee deferral + employer match up to 25% of W-2 compensation). SEP-IRA: 25% of net SE income, up to $72,000. SIMPLE IRA: $16,500 employee + 3% employer match. The OBBBA made these enhanced limits permanent and indexed for inflation going forward.

What's Included

Plan selection analysis (SEP-IRA vs. Solo 401(k) vs. SIMPLE IRA vs. defined benefit)

NJ-specific tax treatment analysis for each plan type

Contribution limit calculation for your income level

Federal and NJ tax savings modeling (side-by-side comparison)

S-corp reasonable compensation interaction analysis

Plan setup coordination with custodian

Catch-up contribution planning (age 50+ and 60–63 enhanced catch-up)

Backdoor Roth IRA analysis for high earners

Cash balance / defined benefit plan analysis for high-income practitioners

Ongoing annual contribution optimization

How It Works

Income & Entity Review

I review your net self-employment income, W-2 compensation, entity structure, and employee situation to determine which plans are available to you.

Tax Modeling

I model the federal and NJ state tax savings for each plan option at your income level, showing you the actual after-tax dollar difference between plans.

Plan Selection & Setup

I recommend the optimal plan and help you set it up with a custodian before the applicable deadline (Solo 401(k) must be established by December 31).

Annual Optimization

Maximum allowable contribution calculated each year, coordinated with payroll and bookkeeping, ensuring the deduction is properly claimed on both federal and NJ returns.

Frequently Asked Questions

What is the best retirement plan for a self-employed NJ taxpayer?

For most NJ self-employed individuals and S-corp owners with no employees, the Solo 401(k) offers the best combination of high contribution limits, a Roth option, and loan provisions. Critically, Solo 401(k) employer contributions are generally deductible on the NJ-1040, while SEP-IRA and traditional IRA contributions are not. The NJ tax difference alone often makes the Solo 401(k) the better choice for NJ taxpayers, even when the federal contribution limit is the same.

Can I contribute to a Solo 401(k) if I have an S-corp?

Yes. If you are the sole employee of your S-corp, you can establish a Solo 401(k). Your employee deferral is up to $24,500 (2026 limit, plus $7,500 catch-up if age 50+). Your employer (S-corp) can also make a matching or profit-sharing contribution of up to 25% of your W-2 compensation. Total contributions cannot exceed $72,000 in 2026. The plan must be established before December 31 of the tax year.

Why doesn't NJ allow IRA deductions?

New Jersey's income tax code does not conform to the federal IRA deduction rules under IRC §219. NJ taxpayers cannot deduct traditional IRA or SEP-IRA contributions on their NJ-1040. This creates the unusual situation where a contribution reduces federal AGI but not NJ taxable income. The benefit: your NJ basis in the IRA is higher, so when you withdraw in retirement, a portion may be excluded from NJ income tax.

What is a SIMPLE IRA and when does it make sense?

A SIMPLE IRA is a retirement plan designed for small businesses with employees (up to 100). Employees can defer up to $16,500 in 2026 (plus $3,500 catch-up if age 50+). The employer must either match employee deferrals up to 3% of compensation or make a flat 2% non-elective contribution for all eligible employees. SECURE 2.0 now allows a Roth option. SIMPLE IRAs make sense when you have employees and want to offer them a retirement benefit without the administrative complexity of a 401(k) plan.

What is a cash balance plan and who benefits from it?

A cash balance plan is a type of defined benefit plan that allows much higher contributions than defined contribution plans, often $100,000–$300,000+ per year for high earners. They work best for physicians, attorneys, CPAs, and other high-income practitioners age 45+ who want to rapidly build retirement savings and reduce taxable income. Cash balance plans require annual actuarial certification and are more administratively complex than SEP-IRA or Solo 401(k) plans.

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These testimonials reflect individual client experiences and do not guarantee similar outcomes. Results vary based on each client's specific facts and circumstances. No client was compensated for providing a review. Tax savings and outcomes depend on individual tax situations and are not typical of all client experiences.

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