S-Corp Tax Planning: What the Owner Memo Should Cover

Most S-corp tax planning goes wrong at the handoff, well after the math is done. The owner gets a salary number and a list of moves, and a year later nobody at the firm can show where the number came from or who approved it.

That gap shows up the first time a client asks "why this salary?" in year three. Or when a new preparer inherits the file. Or when an examiner does. Usually the planning itself was sound, and what's missing is a record of it.

This piece walks through the owner planning memo your firm sends each S-corp client, section by section. It's the deliverable that carries your s corp tax planning strategies from the planning meeting into the owner's year. Six sections: Salary, Distributions, Retirement plan, Accountable plan, Estimated tax, and State. Every recommendation line in it carries its source figure, the assumption behind it, and the name of the Reviewer who signed off. Copy the format, adjust the wording, and use it across your whole S-corp book.

The four fields every recommendation line needs

A planning memo is a list of decisions. The format below makes each decision checkable a year later without calling the person who wrote it.

Recommendation: what the owner should do, in one sentence. Source figure: the number it rests on, where it came from, and its as-of date. Assumption: what has to stay true for the recommendation to hold. Signed off by: the Reviewer's name and the sign-off date.

Most firm memos already have the first field. Some have the second, usually without a date. Few have the third, and the fourth tends to live in someone's email.

Why the sign-off field matters

Your Reviewer controls the conclusion. The memo should show that on its face, line by line, not as one signature at the bottom of a PDF. When the recommendation changes midyear, the new line gets a new sign-off. When it doesn't change, the Reviewer can sign "no change" with a date. Either way the Firm keeps a record of who decided what, and the workpaper stays in the Firm's file.

Section 1: Salary

Start here, because every other section depends on it. Salary drives the payroll tax the corporation and owner pay. It's the base for retirement contributions. And whatever profit isn't paid as salary is what's left to distribute.

The IRS says on its S corporation compensation page that an S-corp owner who works in the business should receive reasonable compensation before taking distributions. What counts as reasonable is a facts question: duties, time, and what comparable businesses pay for comparable work. The IRS rules on S-corp officer salary cover the standard itself, and how to determine reasonable compensation covers the methods firms use.

A ratio isn't evidence. The salary line should point to a documented study, not a rule of thumb.

What the salary line records

• The recommended salary for the year.
• The Reasonable Compensation Study it came from, with the wage source, occupation, geography, and period behind the figure.
• The payroll tax figures it touches. For 2026, Social Security tax applies to wages up to $184,500, a maximum of $11,439 each for employee and employer (SSA, announced 2025-10-24). Medicare tax is 1.45% each on all wages with no cap, plus the 0.9% Additional Medicare Tax, which the employer withholds on an employee's wages above $200,000 for the year; the owner's own threshold depends on filing status (IRC §3101(b)(2), as of 2026-09-23).
• The Reviewer who signed the Study.

This is the one section TracePrep supports today. A Reasonable Compensation Study traces every figure to its source at field level, and the Reviewer signs off before it's final. The Firm keeps the workpapers.

Section 2: Distributions

In the memo, as in the owner's year, distributions come after salary.

Once the salary line is set, the distribution line records the planned cadence (monthly, quarterly, or at year end) and the assumption it depends on. The usual assumptions are cash on hand after payroll and estimated payments, and enough stock basis to take the money out without a surprise. If the owner's basis is unclear, the line should say so and name who's confirming it.

Watch for one pattern: distributions scheduled first, salary backed into whatever's left. That order is hard to defend. Salary vs. distribution for S-corp owners goes deeper on the split.

Section 3: Retirement plan

Salary sets the ceiling here too. For an S-corp owner, employer contributions to most plans are figured on W-2 wages, so a low salary caps what the plan can take in. That's why this section should be written after the salary line, not before.

The 2026 limits the retirement line can cite (IRS Notice 2025-67, as of 2026-09-23):

The line records the plan type, the deferral the owner intends, the owner's age band for catch-up, and the assumption about salary. If the salary line changes midyear, this line gets reopened.

Section 4: Accountable plan

An accountable plan lets the corporation reimburse the owner's business expenses without adding them to wages. It only works if it meets the test in Treas. Reg. §1.62-2(c) through (f) (as of 2026-09-23). The expense needs a business connection. The owner has to substantiate it. And any excess advance has to be returned within a reasonable period.

The memo line records whether a written plan is in place, which categories it covers (home office, phone, mileage, and so on), and how the owner will substantiate. For mileage, cite the rate by period. The 2026 business standard mileage rate is 72.5 cents per mile for January 1 through June 30 and 76 cents per mile for July 1 through December 31 (IRS newsroom and mid-year increase announcement, as of 2026-09-23). A reimbursement log that mixes the two periods under one rate is a common miss.

Section 5: Estimated tax

Pick the safe harbor and say why. Under IRC §6654(d)(1) (as of 2026-09-23), the owner avoids the underpayment penalty by paying, through withholding and timely quarterly installments, at least the lesser of 90% of current-year tax or 100% of prior-year tax (110% if prior-year AGI was over $150,000, or $75,000 married filing separately).

The 2026 individual due dates are April 15, June 15, and September 15, 2026, and January 15, 2027 (IRS Form 1040-ES, as of 2026-09-23).

The line records which safe harbor applies, the prior-year AGI that decides between 100% and 110%, and the payment amounts by date. The assumption is usually that the current year's income will come in near projection. If a large distribution or a sale changes that, the line gets revisited and re-signed.

Section 6: State

This is where planning memos go thin. A single line that says "state: same as last year" isn't a recommendation.

Record the owner's state of residence and every state where the business operates. Note whether each state recognizes the S election the same way the federal return does, and who confirmed it. If a state requires its own election or filing, the line names it and the date it was checked. When nothing changed, the Reviewer signs "no change" with a date. That still counts.

What the memo should not contain

• Savings stated as certain. Use "may" and show the figure it rests on.
• Any figure without a source and an as-of date.
• Recommendations nobody signed.
• Last year's thresholds rolled forward without a check.

Illustrative example: one memo line, filled in

Illustrative example. The client, salary, and dates below are made up.

Recommendation: Pay the owner a 2026 salary of $120,000. Source figure: Reasonable Compensation Study dated 2026-01-20. Medicare tax at 1.45% each side on $120,000 is $1,740 for the corporation and $1,740 for the owner (IRC §3101(b)). Salary sits below the $184,500 Social Security wage base (SSA, announced 2025-10-24), so all of it is subject to Social Security tax. Assumption: Duties and hours match the Study interview. Signed off by: [Reviewer name], 2026-01-24.

Recommendation: Owner defers $24,500 to the 401(k) in 2026. Source figure: 2026 elective deferral limit, IRS Notice 2025-67. Owner is 47, so no catch-up applies. Assumption: Salary stays at $120,000 per the salary line. Signed off by: [Reviewer name], 2026-01-24.

Actual results vary based on income, industry, and state.

Sources and as-of dates

Every figure above, with the source a Reviewer can check and the date it was confirmed.

Conclusion

A planning memo is only as defensible as its weakest line. Give every line its source figure, its assumption, and a signed-off Reviewer, and the memo can answer questions years after it was written.

TracePrep ships the Reasonable Compensation Study today, which covers the salary section. A tax-planning workflow is in development. To start with salary, the section everything else depends on, see how a Study is built.

Not tax advice.

TracePrep is a software product from TracePrep Inc., not a CPA firm. This content is operator experience for educational purposes; it is not tax advice and has not been reviewed by a licensed CPA. Consult a qualified tax professional for guidance on your specific situation. Source citations in TracePrep workpapers support audit defense but do not guarantee IRS outcomes.

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