When Your Tax Strategy Needs More Than One Calendar Year

She sees patients from seven in the morning until late afternoon. She runs her practice through a single-member LLC. Every year, she maxes the 401(k), pays quarterly estimates, files in April, and writes a check for somewhere north of $140,000. And every year, she wonders the same thing: is this just what taxes cost when somebody makes $450,000?

The answer is no. But you would not know it from the way most high earners approach their taxes. They manage one calendar year at a time. Brackets, deduction limits, and income thresholds all reset on January 1, and most planning stops at what can I do before December 31. The problem is that the tax code rewards the person who thinks across years, not inside one. The lever most high earners are pulling — maxing the 401(k) every year, filing in April, and moving on — is barely the first rung.

This is the difference between filing a return and running a strategy that actually shapes what happens. And it starts with a simple shift: stop measuring your tax year like a calendar, and start measuring it like a moving window.

The problem with single-year tax thinking

When you treat each tax year in isolation, you optimize within fixed walls. You max the retirement plan. You maybe make a few year-end moves. You file. But every decision is made against the same twelve-month clock, and the clock resets the moment the return is done.

The tax code does not work that way. The value of a deduction depends on your bracket in the year you take it. The cost of income depends on the year you receive it. The NIIT threshold, the QBI phaseout, the SALT cap — all of them reset annually. What that means in practice is that a dollar earned in December of one year can be taxed very differently than a dollar earned in January of the next, even when the dollar amount is identical.

A high earner who plans one year at a time cannot see those gaps. A high earner who plans across years can use them.

What multi-year planning changes

Go back to the physician making $450,000. Her single-year approach is straightforward: max the 401(k), pay estimates, file. She is doing everything a preparer would tell her to do. But a multi-year view opens moves that never fit inside a single return.

Deferring income into a future year. When her practice has an unusually profitable quarter, she has the option to shift some of that income into a lower-income year, a transition year when she scales back, a sabbatical, a period of slower collections. The same dollar taxed at 35% instead of 40.8% (top bracket plus the Medicare surtax) is a different dollar.

Bunching deductions across two years. The standard deduction, the SALT cap, and charitable limits all reset each year. By concentrating deductions in one year and taking the standard deduction in the next, a high earner can capture room that a single-year approach wastes. The potential changes to the charitable deduction make this timing sharper than usual.

Roth conversions in a low-income window. The multi-year planner watches bracket room the way a driver watches a fuel gauge. When one year drops below the top bracket — maybe a year between jobs, a year after an exit — that gap is the ideal moment to convert pre-tax retirement dollars to Roth at a lower rate. A single-year planner would never see the opening.

Timing capital gains around the NIIT threshold. The 3.8% net investment income tax kicks in at $250,000 for married filing jointly. A single-year planner who sells a large position in a profitable year pays the surtax on every dollar of gains over that line. A multi-year planner can time the sale, or use strategies like an installment sale, to stay under the threshold across years rather than blowing past it in one.

Each of these moves is small on its own. Stacked together, they change the picture.

The TCJA window makes this urgent

The Tax Cuts and Jobs Act's individual provisions expire after 2025. The top marginal rate is scheduled to revert from 37% to 39.6%. The SALT cap of $10,000, already a tight pinch for California filers, falls further relative to the pre-TCJA rules. The QBI deduction disappears entirely. And the standard deduction is cut roughly in half, which means more high earners will itemize and more will hit the Pease limitation on itemized deductions.

For a California high earner, those changes compound. The combined federal and state top rate effectively moves from roughly 50.3% to 52.9% or higher. Every dollar of income that can be deferred out of 2026 and into a year where the taxpayer has more bracket room, or every deduction that can be pulled forward into 2025 or 2026 when rates are lower, is a dollar that matters more than it did last year.

Three years is a short runway for this kind of work. It takes time to set up the entity structure, design the retirement plan, and coordinate the timing. Waiting until the fall of 2026 is too late.

How the pieces fit together

Multi-year planning is not a list of isolated tactics. It is a system built on three coordinated choices.

Entity structure. Whether you file as an S corp, a sole proprietor, or a multi-entity structure changes what you can defer, how much you can fund into retirement, and how the NIIT applies. An S corp gives you control over wage timing that a Schedule C filer does not have. A holding and operating company split lets you shift profit between entities across tax years. The entity you choose sets the range of what is possible.

Retirement plan design. Maxing a 401(k) is a start. A well-designed defined benefit or cash balance plan can shelter more than $150,000 in additional income every year, and the contribution amount can vary year to year, letting you fund heavily in high-income years and lightly in lean ones. That variability is the multi-year tool.

A calendar, not just a checklist. The multi-year planner looks at the next three to five years and maps each move to the year where it delivers the most. A Roth conversion in a low-income year. A heavy retirement contribution in a year with a large bonus. A cost segregation study on a new property in a year that needs the deduction. A year-round review cadence keeps the map current as income and goals shift.

Call (619) 280-2700 or email info@roadmaptax.com to talk about where multi-year planning fits your situation.

FAQ

What is proactive tax planning?

Proactive tax planning means making decisions before the tax year closes and before the return is filed, rather than reporting what happened after the fact. It shifts the focus from compliance to design, and it works best when you look across multiple years, not just the current one.

How can I reduce my tax burden if I have a high income?

For high earners, the most effective levers are entity choice (an S corp election to split self-employment income), retirement plan design (a defined benefit or cash balance plan beyond the 401(k) limit), timing of income and deductions across years, and coordinated use of strategies like cost segregation, the Augusta rule, and installment sales. The exact combination depends on your situation.

Is tax planning worth it?

For anyone earning $300,000 or more, the savings from a well-designed strategy typically outweigh the cost of planning many times over. The question is not whether planning pays for itself, but whether the gap between what your preparer files and what a strategist could design is costing you more than you realize.

When should you hire a tax strategist?

When your situation includes any of these: equity compensation, rental property, a profitable business without an S corp election, a retirement plan that stops at the 401(k) limit, or a major life change like a move out of California, a business sale, or an inheritance. These all create gaps between what a preparer can handle and what a strategist can design.