401(k) or Cash Balance Plan: What's Right for Your Law Firm?

Most law firm partners hit the same wall around their mid-40s or 50s: they're earning more than ever, but a standard 401(k) alone can't shelter enough of that income to make a real dent in retirement. Meanwhile, a firm's most senior partners often want a plan that rewards decades of building the practice, not just a flat percentage applied evenly across the roster. That combination is exactly why cash balance plans have become common alongside 401(k)s at small and mid-sized firms.

Start with what a 401(k) actually gives you

A 401(k) is still the right foundation for every firm. For 2026, employees can defer up to $24,500 of their own salary, and the combined employee-plus-employer limit rises to $72,000. Anyone 50 or older can add a catch-up contribution, now $8,000, and those aged 60–63 get an even bigger "super catch-up" of $11,250.

Even maxed out, though, a 401(k) tops out well short of what a high-earning (and heavy tax burden) partner in their last working decade might want to save. That's the gap a cash balance plan is designed to close.

What a cash balance plan adds

A cash balance plan is a defined benefit plan dressed up to look and feel like a defined contribution account: each partner sees a hypothetical individual balance that grows with contributions and a guaranteed interest credit. Unlike a 401(k), it's layered on top of your existing retirement plan, not a replacement for it.

The appeal for law firms is structural: partner compensation tends to be high and uneven across ages, and a cash balance plan can be designed to reward exactly that. Contribution potential generally increases with age because older participants have fewer years to accumulate the targeted retirement benefit, so a 35-year-old associate might see a modest annual credit, while a 60-year-old equity partner racing toward retirement can often shelter from income taxes well over $150,000–$250,000 of earnings a year, depending on plan design and years to retirement.

The tradeoff is that this isn't a plan you casually adjust year to year. Contributions are actuarially determined and represent a real funding commitment, which means firms need stable, predictable profits to support it comfortably.

What to weigh before adding one

A few practical differences matter:

• Flexibility. 401(k) and profit-sharing contributions can flex with a good or bad year. Cash balance plans require annual actuarial certification and generally involve a required contribution range determined by the actuary. While there may be some flexibility within IRS funding limits, this is not a plan contribution that can simply be turned on and off like a discretionary profit-sharing contribution.
• Staff impact. Nondiscrimination testing may require meaningful contributions for certain non-partner employees, although plan design strategies can often manage the cost.
• Best fit. Firms with consistent profitability and a handful of partners serious about accelerating savings in their final working years get the most value here. A young, growing firm with volatile income may not be ready yet.

What this looks like in practice to set up

1. Census and modeling. An actuary starts with a census of partners and staff (ages, compensation, ownership percentages) and runs projections showing what different plan designs would cost and deliver. This is where you'd see, concretely, that a 62-year-old equity partner might get a $200,000 annual credit while a 30-year-old associate gets a few thousand dollars, and what the total staff cost looks like at various funding levels.
2. Plan design decisions. The firm decides how contributions are allocated, often weighted heavily by age and tenure, sometimes by ownership class, and sets the target benefit and funding assumptions with the actuary.
3. Legal drafting and IRS filing. The plan document gets drafted and typically submitted for an IRS determination letter, which confirms the plan meets qualification requirements.
4. Coordination with the 401(k). The cash balance plan runs alongside the existing 401(k)/profit-sharing plan, so the TPA needs to combine both when testing for nondiscrimination and confirming the total contribution stays within IRS limits.
5. Annual funding and certification. Each year, the actuary certifies the required contribution based on plan assets and assumptions, and the firm funds it. This is the fixed commitment mentioned earlier, so cash flow planning matters from day one.

Cash balance plans can be powerful tools for law firms with consistently high profitability, especially when senior partners want to accelerate retirement savings and reduce current taxable income. However, the right design depends on the firm's partner demographics, employee population, cash flow, and long-term goals.

Our team handles both 401(k) and cash balance plan implementations, partnering with experienced local and national actuarial firms to evaluate plan design options and help coordinate the process. If a cash balance plan could be a fit for your partnership, we can walk you through what the opportunity would look like using your firm's specific numbers.