Bundled vs Unbundled 401(k), Which Is Right for My Dental Practice?

Most 401(k) providers can sound alike when you are shopping. They all talk about recordkeeping, payroll integration, investment options, safe harbor, and profit sharing, so on paper the plans look about the same. In our experience they can produce very different results for a profitable dental practice owner.

The more useful question is what your practice actually needs, and which plan structure gives you the best chance to coordinate tax savings, retirement contributions, staff costs, and fees. That depends on the moving parts behind the plan, the recordkeeper, TPA, advisor, payroll provider, CPA, plan document, and employee census. That is where bundled and unbundled plans start to separate.

What is the difference between a bundled and unbundled 401(k)?

A bundled 401(k) typically places recordkeeping, plan administration, investment support, and compliance coordination with one provider. An unbundled 401(k) separates those roles across specialists.

In an unbundled setup, you may have:

• A recordkeeper that tracks participant accounts, contributions, investments, and transactions. More on this in how recordkeeper and payroll integration works.

• A third-party administrator (TPA) that handles plan design, compliance testing, and annual administration.

• An advisor who helps with the investment lineup, plan onboarding, ongoing service, and coordination between the owner, TPA, recordkeeper, payroll provider, and CPA.

• A payroll provider that sends contribution data and payroll files, ideally with 360 degree integration.

• A CPA that evaluates tax impact and business cash flow.

That is more moving parts. In the right practice, those extra moving parts can produce a better result because each role is more specialized.

The question is whether the simpler structure is costing the owner a meaningful planning opportunity.

When is an unbundled 401(k) usually better for a dental practice?

An unbundled plan tends to make the most sense when four things are working in the owner’s favor.

• The practice is profitable.

• The owner has extra cash flow that is not already committed to lifestyle, debt service, or reinvestment.

• The employee demographics are favorable for profit sharing.

• The owner wants to save more for retirement and reduce taxable income.

The IRS allows total annual additions to a defined contribution plan up to the lesser of 100% of compensation or $72,000 for 2026, before catch-up contributions, and those limits are indexed annually and may change in future years (IRS).

For a profitable practice owner, the gap between a basic deferral-only 401(k) and a well-designed 401(k) with profit sharing can be meaningful.

This is where plan design matters.

A basic plan helps the owner defer salary. A more customized plan evaluates how much the owner can receive through employer contributions, how much must go to staff, whether the testing works, and whether the after-tax result is worth it.

The TPA is not a background vendor in that situation. The TPA models the allocation, runs testing, and helps determine whether the plan design actually supports the owner’s goal.

A good advisor then coordinates that plan design with cash flow, retirement savings targets, CPA conversations, and the broader financial plan. That coordination is the point.

When might a bundled 401(k) still make sense?

There are real situations where a bundled plan is the right answer.

A bundled plan may be the right fit when:

• The practice is still early-stage and profitability is thin.

• The owner does not have excess cash flow beyond personal deferrals.

• The staff demographics make profit sharing inefficient relative to the benefit.

• The plan is mainly meant to be a basic employee benefit.

• The added design work is unlikely to create enough tax value to justify it.

• The owner wants fewer provider relationships to manage.

For example, imagine an associate-heavy practice with a younger owner, three part-time hygienists in their late 20s and early 30s earning wages comparable to the owner’s draw, and a practice that is reinvesting most of its profit back into build-out and equipment.

In that scenario, a profit sharing design may not produce a meaningful owner-weighted allocation because the staff group looks a lot like the owner, and the cash is not there to fund a large employer contribution in the first place.

A bundled plan that handles deferrals cleanly and keeps costs low can be the right answer for that owner, for now. The situation can be revisited in a few years once cash flow, demographics, or owner goals change.

The mistake is treating bundled as the default for every practice. For a profitable dental practice owner with real tax pressure, the plan should be evaluated differently.

You are deciding whether the practice’s profit can be converted into a larger retirement contribution and a larger tax deduction.

Why do demographics matter so much?

The profit-sharing conversation starts with the census.

For a dental practice owner, the most important inputs are usually the owner’s age, the owner’s W-2 compensation, how many eligible employees are in the plan, what those employees earn, and how old they are.

Those details determine how efficiently the plan can allocate employer contributions toward the owner while still providing the required contributions to eligible employees.

That is also why the TPA matters. A good TPA is not just running annual testing. The TPA may model different contribution scenarios and, in some cases, suggest the owner discuss W-2 compensation with the CPA so the profit-sharing design works more efficiently.

Two dentists can have similar practice income and very different 401(k) outcomes. The difference is often the census.

What could the tax difference look like?

Let’s use a realistic scenario from a dental practice plan design review. Numbers below are illustrative.

Dr. Matt is a 34-year-old general dentist who owns a practice with his spouse. The practice has five eligible staff members, $250,000 in current plan assets, and the owners’ marginal federal tax rate is 37%.

The plan design combines maximum employee deferrals, an employer Safe Harbor match, and a profit sharing allocation. The key question is not just what the plan costs. It is what contribution capacity the structure creates, what the staff cost looks like, and whether the tax savings help offset the cost. We lay out the numbers in what a dental practice 401(k) actually costs.

Hypothetical illustration, not a real client or actual results, and not a guarantee of future performance. Assumes a 37% marginal tax rate, the specific salaries, staff census, and 2026 IRS limits shown, and assumed plan sponsor admin fees (recordkeeper and TPA) of $4,530, which vary by provider and plan. Your results will differ.

Component	This scenario
Owner(s) retirement contributions
Max deferral + employer Safe Harbor match + profit sharing	$99,308
Practice out-of-pocket cost
Employer contributions to employees	$20,572
Plan sponsor admin fees (recordkeeper + TPA)	$4,530
Total practice cost	$25,102
Tax savings at 37% marginal rate
Estimated plan tax savings	$46,032
Net estimated tax savings after all plan costs	$20,930

The bottom line is straightforward. The owner group is putting $99,308 into retirement accounts, while the practice spends $25,102 on staff contributions and administration to make that possible.

The estimated tax savings on the plan are $46,032 at a 37% marginal rate. After the staff contributions and plan sponsor admin fees, the scenario still shows $20,930 in net estimated tax savings after plan costs.

This type of result is usually made possible by the flexibility of an unbundled structure, where the TPA, advisor, recordkeeper, payroll provider, and CPA can coordinate the plan design around the owner's specific situation, though the size of the benefit depends on each practice’s facts.

A bundled plan may still offer profit sharing, but it often does not provide the same level of custom modeling or coordination.

That is the reason unbundled deserves a serious look for profitable practices.

How should a practice owner compare bundled and unbundled?

Start with the economics, not the vendor, platform, or brochure.

Do you have extra cash flow?

If every dollar is already going to lifestyle, debt service, payroll, technology, build-out, or reserves, a more advanced design may not be the priority yet.

Are you trying to reduce taxes?

If tax reduction is a major goal, the plan should be evaluated as part of your broader tax strategy, not as a standalone benefit.

Do your demographics support profit sharing?

The employee group matters. Age, compensation, eligibility, and ownership structure can all shift the result.

Will the added complexity create a better after-tax outcome?

Unbundled is better when the added specialization creates enough tax and retirement value to justify the structure.

Who is helping you understand and coordinate the work?

A practice owner should not have to manage every detail between the TPA, recordkeeper, payroll provider, CPA, and advisor.

This is where the advisor becomes especially valuable in an unbundled relationship. The advisor should act as the client-facing head coach, helping the owner understand what is happening, why it matters, and which party is responsible for each part of the plan.

The TPA may be modeling contributions and handling testing. The recordkeeper may be tracking accounts and transactions. Payroll may be sending contribution data. The CPA may be evaluating the tax impact. The advisor helps connect those pieces back to the owner’s goals.

That coordination also supports a prudent fiduciary process. Hiring a retirement plan service provider is itself a fiduciary act, and employers retain responsibility for prudently selecting and monitoring providers even when outside professionals are hired (U.S. Department of Labor). Fiduciaries are expected to act solely in participants’ interests, follow plan documents, act prudently, diversify plan investments, and pay only reasonable plan expenses (U.S. Department of Labor).

That does not mean the owner needs to do everything personally. It means the owner needs a clear process and a team that knows who is doing what.

What are the warning signs your current setup may be too basic?

A bundled plan may be fine if it is accomplishing what you need. It may be too basic if you are seeing these signs.

• You are profitable but only making employee deferrals.

• Nobody has modeled a profit-sharing contribution for you.

• You do not know whether your demographics are favorable.

• Your CPA is asking about tax reduction, but the 401(k) is not part of the conversation.

• You cannot tell who handles plan design versus recordkeeping versus investment oversight.

• Your payroll process is disconnected from your retirement plan.

• Your plan review is mostly an investment menu review, not an owner tax-planning discussion.

That last point matters. A 401(k) review should not only be about the fund lineup.

For a profitable dental practice owner, the review should ask whether the plan is helping the owner do what the owner wants to do: save more, reduce taxes, reward the team, keep the plan compliant, and coordinate with the rest of the financial plan.

What this means for your practice

Bundled vs unbundled 401(k) is the surface-level question. The deeper question is whether your practice has the profitability, cash flow, demographics, and owner goals to make advanced plan design worthwhile.

If the answer is yes, an unbundled structure is usually the preferred path because it gives the advisor, TPA, recordkeeper, payroll provider, and CPA clearer roles to coordinate around a tax-focused design.

If the answer is no, bundled may be the more practical fit at this stage. Demographics and planning needs change, and the plan can be revisited as those facts change.

The goal is to make the 401(k) more useful, not more complicated.

For the right dental practice owner, that usefulness is measured in retirement savings, tax reduction, team benefits, and a plan that actually fits the business.