Proactive Tax Planning: How Firms Deliver It Year-Round

Most firms still do their planning in November. By then the salary has run through eleven months of payroll, three of the four estimated payments are gone, and the retirement deferral window is closing. What's left is a handful of year-end moves and a client who wonders why nobody called in April.

Proactive tax planning moves that work onto a schedule. Your firm reaches out first, at fixed points in the year, and each touchpoint ends with a recommendation on file. For firms with a recurring S-corp book, the service has three parts you can actually point to: a calendar, a deliverable, and a workpaper trail.

Proactive vs reactive tax planning

Reactive planning answers real questions. It answers them late. A year-round tax planning service exists because the levers that matter most for an S-corp owner are time-bound.

Why reactive planning fails the S-corp book

Officer salary runs through payroll every pay period, so a December change can only fix the last few checks. Retirement deferrals have annual limits: $24,500 for 401(k) elective deferrals in 2026, plus an $8,000 catch-up at age 50 or older, or $11,250 instead for ages 60 through 63 (IRS Notice 2025-67, as of 2026-09-23). And a new S election has a filing window. Form 2553 has to be filed no more than 2 months and 15 days after the start of the tax year it takes effect (Form 2553 instructions, as of 2026-09-23). Miss that in March and the election generally takes effect the following year instead, unless the client qualifies for late-election relief.

The year-round planning calendar

This is the calendar a firm can copy. Every deadline below comes from IRS sources checked on 2026-09-23.

Q1: kickoff and prior-year close

Confirm the entity and whether any client wants an S election for this year. If so, Form 2553 goes in inside the 2-month-and-15-day window. Set the salary assumption the rest of the plan depends on, and collect the documents you'll cite.

Q2: first estimates and mid-year review

The April 15 and June 15, 2026 payments come due in this window. Pick the safe harbor now. Under IRC §6654(d)(1), a client can pay 100% of prior-year tax, 110% if prior-year AGI was over $150,000 ($75,000 married filing separately), or 90% of current-year tax. Mid-year is also when some inputs change on their own. The business standard mileage rate is 72.5 cents a mile for January 1 through June 30, 2026, and 76 cents for July 1 through December 31 (IRS newsroom, as of 2026-09-23). A plan that assumed one rate all year needs a note.

Q3: projection refresh

Re-run the projection with year-to-date actuals before the September 15, 2026 payment. Check retirement room against the limits: the $24,500 deferral, the catch-up that applies to the owner's age, and the $72,000 annual additions limit under §415(c) (IRS Notice 2025-67, as of 2026-09-23). The planning memo covers the retirement plan choice in depth.

Q4: year-end decisions

True up payroll. For 2026, Social Security tax applies to wages up to $184,500, a maximum of $11,439 each for employee and employer (SSA announcement of October 24, 2025, as of 2026-09-23). Medicare applies at 1.45% each on all wages with no cap, plus a 0.9% additional employee Medicare tax, which employers withhold on wages above $200,000; the owner's actual liability threshold depends on filing status (IRC §3101(b), as of 2026-09-23). Settle reimbursements under the accountable plan, which needs a business connection, substantiation, and return of any excess within a reasonable period (Treas. Reg. §1.62-2(c)-(f), as of 2026-09-23). The last estimate is due January 15, 2027 (IRS Form 1040-ES).

One deliverable per client: the planning memo

Every cycle ends in a written memo for each client. It's what the client pays for, and it's what your Reviewer signs. Each recommendation in it should trace to a source figure and carry that sign-off. The section-by-section structure of that memo has its own guide: the S-corp tax planning memo. Update the same memo at each touchpoint.

The workpaper trail a firm keeps for each plan

A plan without a file behind it is an opinion. It's what lets a Reviewer sign and the next preparer pick up the engagement. Keep these six items together, in this order:

1. Source documents received, each with the date it arrived and who sent it.
2. The projection and its assumptions, versioned at each touchpoint so you can see what changed.
3. A figure-to-source map for every number in the memo, with the source and the as-of date.
4. The Reviewer's sign-off, dated, on the memo version the client received.
5. The client's acceptance of each recommendation, or a note that they declined it.
6. A change log for any mid-year update that revised a figure, such as the July mileage rate change.

It's the same discipline a Reasonable Compensation Study already follows. The reasonable compensation documentation workpapers guide walks through that file item by item, and the planning file borrows its shape.

Why the trail matters when a notice arrives

A notice can arrive two years after the advice. When it does, the file shows what your firm knew, when it knew it, where each number came from, and who signed. That's the habit covered in citing the source before the IRS notice arrives. A source citation supports your defense. It doesn't guarantee the outcome.

What year-round planning costs per client in capacity

Count the hours before you sell planning. Replace these numbers with your own time records.

Illustrative example. One S-corp client, four touchpoints. Preparer time: kickoff 2.0 hours, mid-year review 1.5, projection refresh 1.5, year-end pass 3.0, for 8.0 hours. Reviewer time: 0.5 hours per touchpoint plus 1.0 hour to sign off the final memo, for 3.0 hours. Total: 11.0 hours per client per year. Across a 40-client book that's 440 hours: 320 preparer and 120 Reviewer. Actual results vary based on income, industry, and state.

Where the hours go

These hours continue the illustrative example above. Data gathering and the projection take most of the preparer time. Reviewer time is close to fixed per memo, which is why it's worth modeling separately. The bigger effect is timing. If all 440 hours land in the 13 weeks of Q4, your team carries about 34 planning hours a week on top of everything else. On the calendar above, only the year-end pass sits in Q4: 3.0 preparer hours plus 1.5 Reviewer hours per client, or 180 hours for 40 clients. That's about 14 hours a week. The other 260 hours move into the first three quarters, when return season isn't competing for them.

Where TracePrep fits today

The salary line is where most S-corp plans start, and it's the part TracePrep handles today. A Reasonable Compensation Study documents the salary figure with traceable evidence, a Reviewer sign-off, and workpapers your firm owns. See how a Study is built.

TracePrep is building a tax-planning workflow. It's in development, and it isn't available yet.

Start with the calendar

Put the four touchpoints on your firm's calendar before you sell a single plan. Then decide what goes in the memo and what goes in the file. The service follows from those three things. When you're ready to put the salary line on solid evidence, Get started.

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.