If your accountant has mentioned the QBI deduction and you nodded along without really knowing what they meant, you are in extremely normal company. It has an ugly name, it comes with a second ugly name attached, and nobody explains either one.
So here it is without the acronym soup. QBI stands for qualified business income, which is just the profit your practice makes after expenses. The QBI deduction for therapists lets a lot of self-employed people knock a slice of that profit off the income they get taxed on. You do not spend anything to get it. It is not a write-off you have to buy something for. It is a deduction you either qualify for, or you do not.
Therapists sit in an awkward spot with it, and the reason is worth understanding, because it changes what you should actually be paying attention to.
Why Therapists Count as an SSTB
The tax code has a category called a Specified Service Trade or Business. Nobody says that out loud, so people call it an SSTB.
It covers businesses where the thing being sold is essentially the professional’s own skill and judgment. Health, law, accounting, consulting, performing arts. Therapy is squarely inside it, and there is no clever structure that gets you out. If you are providing therapy under your own license, you are an SSTB.
Being an SSTB does not mean you lose the deduction. Plenty of therapists take it every year. What it means is that your eligibility depends entirely on your income, and above a certain point it goes away completely rather than just shrinking.
That threshold is the whole ballgame, so let’s look at what it actually is.
The Income Threshold That Decides Your QBI Deduction
For 2026 the threshold is $201,750 if you file single, or $403,500 if you file jointly.
Two things about that number tend to surprise people.
The first is that it is your total taxable income, not your practice profit. If you file jointly and your spouse earns well, their income counts toward it. Plenty of therapists with a modest practice are over the line because of a partner’s salary, and they never think to check.
The second is that it is not a cliff you fall off in one step. Above the threshold there is a phase-in range where the deduction shrinks gradually, and above the top of that range it is gone. Under the threshold, you take the full deduction like any other small business, SSTB or not.
If you are comfortably under, this is genuinely simple: you qualify, your accountant takes it, you carry on. The complications start when you are near the line, and the way people get near it is rarely what they expect.
How the QBI Threshold Catches Therapists Out
A therapist we work with was filing jointly, running a solo practice that cleared a healthy but not extraordinary profit. On her own she was nowhere near the threshold. Her husband got a promotion mid-year.
Nobody connected the two things until we were preparing the return, at which point their combined taxable income had crossed into the phase-in range and a deduction she had taken comfortably for years shrank noticeably.
Nothing had gone wrong in her practice. She had simply never been told that the number that governs her deduction is a household number, not a practice number. Once she knew, she had options. Before she knew, she had a surprise.
That is the actual risk here, and it is not really a tax risk. It is a not-knowing risk, which is the kind you can do something about.
Worth saying before we get to the levers: none of this requires you to restructure your practice or do anything clever. It requires you to know one number about your household and check it before the year ends.
How to Protect Your QBI Deduction Near the Threshold
The lever most therapists have is retirement contributions, because they come off your taxable income.
Putting money into a Solo 401(k) or a SEP reduces the income figure the threshold is measured against. If you are hovering just above the line, a contribution you were probably going to make anyway can pull you back under it, and you keep both the retirement money and the deduction.
This is worth actually modelling rather than guessing at, because the amount that helps depends on where you are sitting. Our guide to tax deductions for therapists covers what else counts, and the therapist guide to estimated taxes walks through how these pieces fit into what you pay quarterly.
Timing matters too, which brings us to the part people leave too late.
Does Your Practice Structure Change the QBI Deduction?
A bit, and not in the way most people assume.
If you are a sole proprietor or a single-member PLLC, your whole practice profit is potentially qualified business income. Straightforward.
If you have elected S-corp status, you split your income into a salary you pay yourself and profit that passes through. The deduction applies to the pass-through profit, not to the salary. So the S-corp election changes the size of the number the deduction is calculated on, which is one of several reasons that decision is not purely about self-employment tax.
It also means the two decisions interact. Paying yourself a bigger salary lowers the pass-through profit the deduction applies to, while paying yourself a smaller one raises it but has to stay defensible as reasonable compensation. That is a genuine tradeoff and not one to guess at.
If you are weighing that up, our S-corp vs PLLC calculator runs it on your own figures rather than a generic example.
When should you look at your QBI deduction?
December, not April.
By the time you are filing, your income for the year is fixed and so is your answer. Everything useful happens while you can still change something: making a retirement contribution, timing a big equipment purchase, deciding whether to take income this year or next.
If you are anywhere near that threshold, a conversation in the last quarter of the year is worth more than any amount of cleverness in the spring.
You do not need to become an expert in any of this. You need to know roughly where your household income lands and whether it puts you near a line that matters. That is a question your accountant can answer in about ten minutes, and it is worth asking before the year closes.
If you would like us to look at where you actually sit, let’s chat.
TL;DR:
Therapists count as an SSTB, so the QBI deduction depends entirely on your total household taxable income. Under the threshold, you take it in full; above it, it phases out and then disappears. Retirement contributions are the main lever, and December is when they still work.
