Choosing the right retirement savings vehicle is one of the most consequential decisions a small business owner can make. Your choice affects the bottom line today, your employees' financial security tomorrow, and your ability to attract talent in a competitive market. The distinction between qualified and nonqualified retirement plans sits at the center of this decision, and understanding how each type works (along with the advantages, compliance requirements, and contribution limits that apply in 2025 and 2026) can save you thousands of dollars and hours of administrative headaches.

What Makes a Retirement Plan "Qualified"?

A qualified retirement plan meets the requirements of Internal Revenue Code (IRC) Section 401(a) and the standards set by the Employee Retirement Income Security Act of 1974 (ERISA). In exchange for following strict rules around eligibility, vesting, funding, and nondiscrimination, these arrangements receive favorable treatment from the IRS.

The core trade is straightforward: the government grants benefits, and in return the plan must cover rank-and-file employees fairly, not just owners and executives. Common examples include:

  • 401(k) plans, which allow employees to make pre-tax or Roth elective deferrals from their paychecks
  • Defined benefit (pension) plans, which promise a specific monthly benefit at retirement based on salary and years of service
  • Profit-sharing plans, which let employers contribute a discretionary percentage of profits each year
  • 403(b) plans (also called tax-sheltered annuities), available to staff at public schools and certain nonprofit organizations
  • Qualified annuity contracts, where the employer purchases an annuity funded with pre-tax dollars through an insurance provider, providing guaranteed retirement payments

Qualified Annuities vs. Nonqualified Annuities

Annuities deserve specific attention because they can exist on both sides of the qualified/nonqualified divide. A qualified annuity is funded with pre-tax dollars inside an approved plan (such as a 403(b) or a pension that purchases annuity contracts). Because the money goes in pre-tax, the entire distribution is taxed as ordinary earnings when withdrawn. An annuity purchased outside any workplace plan is considered nonqualified. With that type, only the growth portion of each withdrawal is subject to taxation, since the original cost basis has already been taxed. Both types benefit from tax-deferred growth while the money remains invested, but the treatment at distribution differs significantly.

Key Advantages of Qualified Arrangements

Qualified plans deliver three primary benefits that make them attractive to both employers and their workforce:

  • Employer deduction: contributions the employer puts in are deductible in the year they are made, subject to IRC Section 404 limits
  • Deferral for participants: traditional (pre-tax) contributions reduce current taxable amounts, and earnings enjoy tax-deferred growth until withdrawal
  • Roth option: many plans now offer Roth deferrals, where employees put in after-tax dollars but qualified withdrawals (including earnings) are completely free from further taxation

These advantages come with requirements. The law mandates fiduciary responsibility (managers must act in participants' best interests), disclosure and reporting obligations (including annual Form 5500 filings), minimum vesting schedules, and nondiscrimination testing to ensure the plan does not disproportionately benefit highly compensated employees.

2025 and 2026 Limits

The IRS adjusts dollar limits annually for inflation. Here are the key figures for the most common qualified and tax-advantaged retirement vehicles, per IRS Notice 2025-67:

  • 401(k), 403(b), and 457(b) elective deferrals: $23,500 (2025) / $24,500 (2026)
  • Catch-up (age 50 and older): $7,500 (2025) / $8,000 (2026)
  • Super catch-up (ages 60 to 63): $11,250 for both years, introduced by the SECURE 2.0 Act
  • Total annual additions to defined contribution vehicles (Section 415(c)): $70,000 (2025) / $72,000 (2026)
  • Compensation cap for calculating amounts: $350,000 (2025) / $360,000 (2026)
  • Traditional and Roth IRA amounts: $7,000 (2025) / $7,500 (2026), with a catch-up of $1,000 (2025) / $1,100 (2026) for those 50 and older

One important change for 2026: under the SECURE 2.0 Act's Roth catch-up mandate, workers whose prior-year FICA wages exceeded $150,000 must make catch-up deferrals on a Roth (after-tax) basis. This affects 401(k), 403(b), and governmental 457(b) arrangements.

What Is a Nonqualified Retirement Arrangement?

A plan that does not meet the requirements of IRC Section 401(a) is classified as nonqualified. Because it falls outside the qualified standards, it is not subject to the same nondiscrimination requirements, dollar caps, or reporting obligations. This gives the employer flexibility to offer supplemental retirement benefits to a select group of executives or key personnel.

Common types include:

  • Deferred compensation (NQDC) plans governed by IRC Section 409A, where participants defer a portion of their pay to a future date
  • Supplemental executive retirement plans (SERPs), which provide additional income in retirement beyond what qualified vehicles offer
  • Executive bonus arrangements (Section 162), where the employer pays life insurance premiums as a bonus to the individual

How Are These Plans Taxed?

The treatment of arrangements that fall outside Section 401(a) differs significantly, and this distinction is often misunderstood. Here is how it actually works:

  • Deduction timing: the employer cannot deduct amounts when set aside. Instead, the deduction is delayed until the participant recognizes income, typically at distribution (under IRC Sections 83(h) and 404(a)(5)). The deduction is deferred, not lost entirely.
  • Participant taxation: in a properly structured NQDC plan complying with Section 409A, the individual defers income recognition until benefits are actually paid out.
  • No dollar caps: unlike qualified vehicles, there are no caps on how much can be deferred.
  • Weaker creditor protection: assets are typically held in the employer's general pool (or a rabbi trust) and remain subject to claims by creditors in bankruptcy.

Section 409A imposes strict requirements on the timing of distributions, deferral elections, and documentation. Violations trigger immediate inclusion, a 20% penalty, and premium interest charges on the individual. Employers face reporting and withholding penalties for noncompliance. Note that annuities purchased individually (outside of a workplace plan) follow different rules under IRC Section 72 rather than Section 409A, but still provide tax-deferred growth on your money until withdrawals begin.

Key Differences at a Glance

The following comparison highlights the core distinctions that matter most when choosing a structure:

  • Approval: qualified plans must meet IRC 401(a) requirements; the other category does not
  • Coverage: qualified plans must be offered broadly and pass nondiscrimination tests; the alternative can be restricted to select executives
  • Employer deduction: immediate for qualified contributions; delayed until the participant is taxed for the alternative
  • Dollar limits: qualified plans are subject to annual caps; the alternative has no statutory limit
  • Creditor protection: strong under ERISA for qualified plans; generally weak otherwise
  • Regulatory burden: qualified plans require Form 5500 filings, nondiscrimination testing, and fiduciary compliance; the alternative has lighter (but still serious) Section 409A requirements

Retirement Options for Small Businesses

For small business owners, the choice is not always between a full 401(k) and an executive arrangement. Several simplified options exist that balance savings with reduced administrative burden:

SIMPLE IRA

Available to employers with 100 or fewer employees who earned at least $5,000 in the prior year (and who do not maintain another qualified plan). Deferrals for 2026 are capped at $17,000, with a $4,000 catch-up for those 50 and older and a $5,250 super catch-up for ages 60 to 63. Employers with 25 or fewer workers may allow higher deferrals of $18,100 under SECURE 2.0. The employer must either match deferrals dollar-for-dollar up to 3% of compensation or make a 2% contribution to all eligible participants. SIMPLE IRAs are technically covered by the federal retirement law, but most qualify for a Department of Labor safe harbor that exempts them from many reporting and fiduciary requirements, making them far simpler to administer than a 401(k).

SEP IRA

A Simplified Employee Pension (SEP) IRA lets the employer contribute up to 25% of each eligible employee's compensation, with a maximum of $72,000 per person for 2026. Only the employer contributes (employees cannot make elective deferrals). The percentage must be uniform for all eligible staff. SEP IRAs are popular with sole proprietors and freelancers because of their high ceiling and minimal paperwork.

Solo 401(k)

Designed for self-employed individuals with no employees other than a spouse, a solo 401(k) combines deferrals (up to $24,500 for 2026, plus catch-up amounts) with profit-sharing contributions (up to 25% of net self-employment earnings). The total cannot exceed $72,000 for 2026 (before catch-up). This structure allows significantly higher total savings than a SEP IRA at lower earnings levels. Learn more about catch-up retirement strategies and how they interact with these vehicles.

SECURE 2.0 Act Changes That Affect Your Choice

The SECURE 2.0 Act, enacted in late 2022, introduced several provisions that continue to roll out through 2026 and beyond:

  • Automatic enrollment: new 401(k) and 403(b) plans established after December 29, 2022 must automatically enroll eligible employees at a rate between 3% and 10%, with annual 1% escalation up to at least 10% (but no more than 15%)
  • Super catch-up: participants ages 60 to 63 can defer more than the standard catch-up amount ($11,250 for 401(k), $5,250 for SIMPLE in 2026)
  • Student loan matching: employers may treat qualified student loan payments as elective deferrals for purposes of matching contributions
  • Part-time eligibility: long-term part-time employees (500+ hours for two consecutive years, reduced from three years) must be allowed to participate in 401(k) plans
  • 529-to-Roth IRA rollovers: beneficiaries of 529 accounts can roll over up to $35,000 (lifetime) into a Roth IRA, subject to annual contribution caps. Read more about this new option for 529 account owners.

Arizona Considerations

Arizona imposes a flat 2.5% rate on all taxable earnings, including retirement distributions. Because Arizona conforms to federal adjusted gross amounts as its starting point, pre-tax deferrals to qualified plans that reduce federal AGI will also reduce Arizona taxable amounts. Withdrawals from both qualified and nonqualified plans are included at the same 2.5% rate.

Arizona does not apply its state levy to Social Security, which may influence how retirees coordinate withdrawals alongside their Social Security payments. For business owners considering entity structure alongside retirement strategy, our estate planning and entity formation services can help align your business and personal goals.

How K&R Taxes Can Help

Selecting the right retirement vehicle requires balancing financial efficiency, compliance obligations, employee needs, and your business's growth trajectory. At K&R Taxes, we help Arizona business owners evaluate their options, set up compliant plans, and optimize contributions to maximize savings. Whether you are a sole proprietor exploring a SEP IRA or a growing business ready to implement a 401(k), our strategic advisory team can guide you through every step. Contact us today to schedule a consultation.