The $500K Business Owner Tax Playbook
What to do, in what order, across the first full year of real planning.
Crossing $500,000 in profit changes which tax strategies are worth their complexity. This playbook sets out the sequence we work with new clients at this level: structure first, because it constrains everything else; then retirement plan design, because it is the largest deduction; then depreciation and state elections, because they depend on the first two being settled.
Phase One: Establish the Baseline (Weeks 1-3)
No decision gets made before the current position is measured. That means the last three years of business and personal returns read together, the current effective rate calculated rather than estimated, the entity structure and its elections confirmed, and existing retirement plans and their unused capacity documented.
The three-year lookback is not a formality. It is where prior-year errors surface: missed depreciation, unclaimed credits, an S election that was never properly filed, a PTET election available and never made. Recoverable amounts frequently exceed the first year of forward planning, and they are recoverable through amended returns or a Form 3115 catch-up.
Phase Two: Settle the Structure (Weeks 3-6)
Structure comes before everything because it determines the inputs to everything. The questions to close:
- Is the operating entity taxed correctly for its profit level and owner involvement?
- If an S-corp, is there a documented reasonable compensation file, or a number nobody can derive?
- Should real estate or equipment sit in a separate entity?
- Is there a role for a C-corp management company for retained earnings and fringe benefits?
- Does the operating agreement conflict with the tax election in place?
Entity changes generally take effect the following tax year, so decisions made here are being made for next year, not this one. That is precisely why they come first.
Phase Three: Design the Retirement Plan (Weeks 6-10)
This is the largest deduction most owners at this level will ever access, and it has a hard installation deadline, so it gets its own phase.
The work is an actuarial study modeling the owner's age, compensation, and employee census against several plan designs; the required employee contributions under each; a comparison of solo 401(k) alone against a paired cash balance plan; and confirmation of installation deadlines, which differ by plan type and can fall before year-end.
Missing the installation deadline forfeits the entire year's deduction. It is the single most expensive deadline on this list.
Phase Four: Deploy Depreciation (Weeks 10-16)
With the structure settled and the plan installed, depreciation gets placed where it can actually be used:
- A cost segregation study on any owned commercial or rental property, including property acquired in earlier years, which can be caught up through Form 3115 without amending.
- Equipment and vehicle purchases timed against 100 percent bonus depreciation, permanent under the OBBBA for property acquired after January 19, 2025.
- A usability analysis before anything is commissioned: if passive activity rules will suspend the loss, the deduction has been bought and cannot be spent.
What Each Phase Should Produce in Writing
A useful check on whether the sequence is actually being followed is whether each phase leaves a document behind. Planning that produces only conversations tends to evaporate when the year gets busy.
- Phase one: a written baseline with the current effective rate, and a schedule of recoverable prior-year amounts with the route to recover each.
- Phase two: an entity comparison modeled over several years, and a reasonable compensation analysis with its market data and derivation.
- Phase three: an actuarial study comparing plan designs, with the employee cost of each quantified.
- Phase four: a depreciation analysis that states explicitly whether the loss will be usable, before any study is commissioned.
- Phase five: a dated calendar of elections, deadlines, and revised estimated payments.
If a phase produced no document, it is worth asking whether it was actually performed or merely discussed.
Phase Five: State Elections and Year-End (Weeks 16-52)
The remainder of the year is election deadlines and execution. The PTET election where the state offers one, with attention to its specific deadline and estimated payment requirements. Multi-state apportionment if the business operates across lines. An accountable plan adopted and actually used. Quarterly estimates recalculated against the new position rather than last year's safe harbor.
Then a year-end review in November, early enough that anything requiring action still has runway. A December review is a report, not a plan.
Key Takeaways
- Measure the baseline before deciding anything; the three-year lookback often funds the engagement.
- Structure decisions come first because they set the inputs for every later move.
- Retirement plan installation deadlines are unforgiving and can fall before year-end.
- Confirm a depreciation loss will be usable before commissioning the study that creates it.
- Run the year-end review in November; a December review is a report, not a plan.
Start With the Pillar Guide
Frequently Asked Questions
How long before tax planning shows results?
State elections and retirement contributions can affect the current year if handled before their deadlines. Entity changes usually take effect the following year. Prior-year recovery through amended returns or a Form 3115 catch-up can produce refunds within months of filing.
What if I am mid-year when I start?
Most of the sequence still applies. Retirement plan installation and state elections often remain available depending on the deadline, and the three-year lookback is unaffected by where you are in the year. Entity changes shift to the following year, which they usually would have anyway.
Do I need to change CPAs to do this?
Not necessarily. Planning and compliance are different functions and can sit with different firms. Many owners keep an existing preparer for filing and add an advisory relationship for the planning work. What does not work is assuming a compliance engagement includes planning it was never scoped to deliver.
What does this engagement cost?
Our advisory engagement is $7,800, quoted flat before work begins, with cost segregation studies priced separately at $1 per square foot subject to a $2,000 minimum. Amended returns are $2,500 each. Fees are quoted in writing rather than billed hourly.
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