Two contingency-fee contracts both say "40% of savings." On the same successful appeal — assessor's notice came in at $580,000, the homeowner pushed it back to $530,000 — one contract bills $480 and the other bills $1,440. Same outcome, identical headline percentage, three-times-larger fee. The difference isn't deception in the strict sense. Both contracts disclose what they do. But the calculation method inside each agreement varies enough between firms that the headline contingency rate, treated alone, doesn't tell a homeowner what they will actually pay.
Four methods are common across the property-tax-appeal service industry. Three of them produce a fee that exceeds the homeowner's actual cash benefit when the assessor's noticed value was inflated relative to last year's bill — which, in jurisdictions with annual reassessment, is most of the time.
Most homeowners read "40% of first-year tax savings" and assume the math is: the tax bill before the appeal, minus the tax bill after the appeal, times 40%. That is one definition. The contracts in the field use four.
The four methods produce different fees on the same outcome because each one defines "before" differently. The question worth answering before signing is which "before" the contract uses.
Take last year's actual tax bill. Take this year's tax bill at the post-appeal value, using this year's tax rate. The difference is "savings." Apply contingency.
This is the homeowner-favorable baseline. What the homeowner experiences as cash savings is what the contract bills against. If last year's bill was $7,200 and this year's post-appeal bill is $7,000, "savings" is $200 and a 40% contingency is $80.
Where it shows up: New Jersey County Tax Board engagements where the agent is on retainer or flat fee; some Texas firms using subscription pricing rather than contingency. Less common in pure-contingency contracts.
Verifying it in the contract: language references "year-over-year reduction," "previous year's billed taxes," or "the prior year's final assessed value" as the baseline.
This is the most common method in practice — and the one that produces fees larger than the homeowner's actual cash benefit when the assessor's notice was inflated.
The example from the opening: assessor's notice arrives at $580,000. Last year's assessed value (and tax bill) was based on $530,000. The homeowner appeals, and the value comes back to $530,000 — exactly where it was last year.
Under Method 2, "savings" is calculated as: the tax that would have been billed at $580,000, minus the tax billed at $530,000. If the millage rate is 2.4%, that is $1,200 of "savings," and a 40% contingency produces a $480 fee.
From the homeowner's actual cash position, however, nothing has changed compared to last year — they are paying the same tax bill they paid last year. They paid $480 to a service whose successful outcome was preventing a tax increase, not creating a tax decrease. That is a defensible commercial outcome (preventing the increase took work), but it is not what most homeowners think they are buying when they see "40% of savings" on a flyer.
Where it shows up: most national contingency firms (Ownwell, O'Connor, regional Long Island grievance services) use the noticed-value baseline. Some are explicit about it; others use phrases like "reduction in assessed value" without specifying which baseline.
Verifying it in the contract: language references "noticed value," "initial assessed value," "proposed assessment," "the value before adjustment," or — sometimes — simply "the assessed value." Any phrasing that points at the assessor's number rather than at last year's billed amount is Method 2.
Watch for: contracts that compute savings against an "estimated" or "projected" market value when the noticed value isn't yet finalized. This compounds the Method 2 effect with a forecasting layer. The fee gets locked in against a number that may move.
Same single-year reduction, but the contract bills as if the savings recurred over multiple years.
The textbook example is publicly observable in O'Connor & Associates' Illinois service agreement (linked at the bottom of this post): the standard contingency is computed against the three-year projected savings from a successful PTAB appeal. A $400/year reduction becomes $1,200 of "savings" inside the contract. At a 50% contingency, the fee is $600 on what is functionally a single-year $400 reduction — assuming the assessor doesn't raise the value back up in years 2 or 3, which is not guaranteed.
Why it is more aggressive than the rate suggests: future-year savings depend on the assessor not rebounding the value. The fee, however, is collected up-front. The forecasting risk sits with the homeowner.
Where it shows up: Illinois (PTAB rollover states, where §16-185 carries a successful PTAB reduction forward into the next quadrennial cycle absent intervening factors); California (Prop 8 decline-in-value reviews, which can persist year over year if the market doesn't recover); some commercial Tax Court engagements.
Verifying it in the contract: any reference to "projected savings," "estimated future savings," "three-year savings," "multi-year savings," "lifetime of the reduction," or savings calculated for "each year the reduced value remains in effect."
Some contracts compute the fee from the assessor's eventual reduction percentage applied to a projected tax bill, before the homeowner has received the post-appeal tax bill itself.
The risk to the homeowner is straightforward: the projected bill assumes a stable tax rate. Tax rates move. In jurisdictions with truth-in-taxation requirements (Texas), levy lids (Washington, Massachusetts), or growth-rate caps (California Prop 13's 2% cap, New York's tax cap), the actual cash savings can diverge from the projection by 5-15% in either direction. The fee, however, is typically billed within 30-60 days of the final adjudicated value.
Where it shows up: firms that bill on a tight collection cycle, often after the appraisal review board's certified value but before the taxing units have set their rates.
Verifying it in the contract: language about "estimated tax savings," "based on the prior year's tax rate," or "calculated using the most recent applicable tax rate." If the contract references a tax rate before the rate has been set for the current year, the math is projected.
The methods aren't mutually exclusive. The largest fees in the industry come from contracts that combine Methods 2 and 3 — savings calculated against the assessor's noticed value, multiplied by three years (or five, or "lifetime").
On the inflated-notice example, combining the two methods produces:
| Method | "Savings" calculated | Fee at 40% | Homeowner's actual year-1 cash benefit vs. last year |
|---|---|---|---|
| 1. Year-over-year | $0 | $0 | $0 (paying last year's bill) |
| 2. Vs. noticed value, 1 year | $1,200 | $480 | $0 (paying last year's bill) |
| 3. Vs. last year's bill, 3 years | $0 | $0 | $0 (paying last year's bill) |
| 2 + 3. Vs. noticed value, 3 years | $3,600 | $1,440 | $0 (paying last year's bill) |
The same successful appeal — pushing the assessor's notice back to last year's level — produces a fee anywhere from $0 to $1,440 depending on which method the contract uses. The homeowner's cash position vs. last year is identical in every row.
This is not a hypothetical. Public service agreements from large national firms in PTAB-state markets show the combined Method 2 + Method 3 structure. Their commercial logic is sound — a successful PTAB appeal can deliver multi-year savings, and pricing the agency relationship against that future stream is rational from the firm's perspective. The point is that the homeowner who reads "40% of savings" and signs without reading the savings definition is not buying what they think they're buying.
Negotiating the headline percentage is the wrong place to spend leverage. The savings basis matters more. Before signing any contingency-fee agreement, find these five answers in the contract text:
The structural fix: ask the firm for a written amendment that defines "savings" as "the difference between the prior year's actual tax bill and the current year's actual tax bill, after the post-appeal value is applied." If they decline the amendment, you've learned which method the standard contract uses.
The four methods are national, but the contracting rules and disclosure norms vary by jurisdiction.
Texas Property Tax Code §1.111 governs agreements between property owners and authorized agents. The Texas Comptroller's Form 50-162 is the appointment-of-agent form that authorizes a service company to file protests on a homeowner's behalf with the appraisal district. The fee agreement is a separate document from Form 50-162 — the form authorizes representation; the contract sets the price. Read both.
Texas has the largest concentration of contingency-fee firms in the country (Houston-metro O'Connor, Austin-metro Texas Tax Protest, statewide Five Stone, plus dozens of smaller firms). Volume-based business models in Texas tend to use Method 2 against the noticed value. Some firms have moved to flat-fee or subscription pricing partly to reduce the disclosure friction of explaining Method 2 math.
Long Island tax grievance is a distinct sub-market with higher headline contingency rates than the rest of the country. All Island Tax Grievance's published fee schedule is 50% of first-year tax savings; Heller & Consultants advertises the same 50% rate. Both apply contingency to a single year, which mitigates the Method 3 risk, but the headline rate is double the national average.
The structural reason for Long Island's higher rates is the SCAR (Small Claims Assessment Review) framework: every parcel-level grievance is procedurally distinct, the firms carry standing relationships with assessors and BARs, and the volume of successful grievances per parcel is lower than in Texas-style ARB systems. Whether that justifies a 50% rate is a judgment call. The math methods question still applies: which "before" does the firm use?
Illinois is the cleanest example of a Method 3 jurisdiction. A successful PTAB ruling generates §16-185 carry-forward — the reduced assessed value rolls into subsequent years of the quadrennial cycle absent intervening factors. Service companies operating in Illinois have a real commercial basis for billing against multi-year savings, and the public service agreements reflect that.
The trade-off the homeowner is being asked to accept: pay 50% of three years of projected savings now, in exchange for the firm bearing the litigation cost and procedural complexity. That can be a fair trade or a bad one depending on the size of the case, but it is not what most homeowners think they are being quoted when they see "50% contingency."
California is unusual: most Prop 8 (decline-in-value) reviews are handled at no cost by the county assessor's office. Service-company involvement is concentrated at the Assessment Appeals Board (AAB) tier, where formal hearings begin to resemble small claims litigation. Contingency rates of 25-40% are typical for AAB-tier residential cases. The math-methods question is the same; the value-of-engagement question is different — for many California parcels, the no-cost Prop 8 review is the right first move and a service company is appropriate only if Prop 8 is denied.
The County Tax Board tier is contingency-friendly; the Tax Court tier (for cases above the County Tax Board jurisdictional threshold or appealed beyond it) is generally hourly + flat-fee with attorney engagement. Asking the firm which tier they expect your case to land at, and what billing applies at each tier, surfaces the contract structure earlier than reading the contingency clause alone.
Separate from the savings-math question is the contract-tenure question. Many contingency contracts auto-renew for subsequent years unless the homeowner explicitly cancels by a date and channel specified in the contract.
Two failure modes to plan for:
Rejecting auto-renewal at the contracting stage — asking for an amendment that limits the engagement to the current tax year only — is harder than handling each year individually, but it eliminates the failure mode entirely. Some firms accommodate it on request; others won't.
The four methods describe how contingency math gets stretched. The structure isn't always anti-consumer:
The structural fix isn't to avoid contingency-fee services categorically — it's to read the contract for the savings basis, the year count, the tax-rate assumption, the minimum fee, and the auto-renewal default before signing. Five terms. Ten minutes of reading. The leverage on those terms is much larger than the leverage on the headline percentage.