The Q4 Tax Strategy Window: Five Moves to Make Before December 31

Most business owners think of taxes as a spring event. By the time April arrives, however, the previous year is already closed — and nearly every lever that could have reduced your liability has expired with it.

The truth tax professionals repeat is this: tax strategy is a fourth-quarter discipline. The window between October and December is when your numbers are real enough to model, and there is still enough runway to act.

1. Model your projected liability now

Before any move, estimate where you will land. Pull a year-to-date profit and loss, project through December, and forecast the tax owed at your current entity structure. You cannot optimize what you have not measured.

2. Evaluate the S-Corp election

If you operate as a profitable LLC and have not elected S-Corp status, self-employment tax may be your single largest avoidable cost. The election must be made in a timely manner, and a reasonable salary must be established — but for owners netting $60,000 or more, the savings often run into five figures annually.

3. Time your major purchases

Equipment, vehicles, and qualified property placed in service before year-end may qualify for Section 179 expensing or bonus depreciation. The decision is not always to buy — it is to buy with intent, aligned to genuine business need and your projected income.

4. Maximize retirement contributions

A SEP-IRA or Solo 401(k) lets you shield a significant portion of net earnings from current-year tax while building long-term wealth. Contribution limits are generous for business owners, and the deadline often extends past December 31 — but the planning must begin now.

5. Review your entity and accounting method

Whether your cash-basis accounting still serves you, whether a multi-entity structure would isolate risk, and whether your ownership distributions are optimized are questions best answered while there is still time to implement the answer.

Strategy is not what you do in April. It is what you engineer in October.

If you have not yet modeled your fourth-quarter position, that is the first conversation to have. The moves above only matter if they are made before the calendar turns.