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Guide · Updated August 12, 2026

Flat fee vs. contingency: what commercial property tax help actually costs

There are two ways to pay for help with a Texas commercial property-tax protest: a flat fee that stays the same whatever happens, or a contingency fee that is a percentage of the reduction a consultant obtains. Neither is 'better' in the abstract — they price risk differently. This guide lays out the trade-off in plain numbers so you can see which fits your property.

Two ways to pay

A contingency fee ties the cost to the result: a consultant handles the protest and is paid a percentage — commonly in the 25%–50% range — of the tax reduction obtained, typically with no fee if there is no reduction. A flat fee is a fixed price paid up front for a defined deliverable, and it does not move with the outcome. The contingency model bundles the work and the risk; the flat-fee model prices only the work.

The distinction matters because a percentage of a large reduction can be a substantial, recurring amount, while a flat fee is the same modest cost regardless of how the protest turns out. Which is cheaper depends on the size of the reduction — and no one can promise that number in advance.

The trade-off, side by side

Contingency vs. flat fee

Contingency consultantFlat-fee self-file
How you payA percentage of the reduction obtained (commonly ~25%–50%), often each year handled.A fixed price for the analysis and evidence materials, paid once.
Cost if no reduction resultsTypically nothing.The flat fee (a small, known amount).
Cost if a large reduction resultsA large amount — the fee scales with the result.The same flat fee — it does not scale.
Who does the filingThe consultant, as your designated agent.You do, using the packet — Texas law lets every owner self-file.
What you're paying forThe work and the risk, bundled.The analysis and materials only.

Illustrative comparison of pricing models, not a quote or a prediction of any result. Corriden charges a flat fee only and is never a percentage of any reduction.

A worked illustration

Suppose a protest were to lower a commercial parcel’s assessment enough to reduce the annual tax bill by a hypothetical $8,000. Under a 40% contingency, the consultant’s fee for that year would be $3,200 — and a similar share again in any future year they handle it. Under a flat self-file packet — a single fixed fee set by the parcel’s assessed value, not by the result — the cost is that one fee, once, whatever the reduction turns out to be. If instead the protest produced no reduction, the contingency fee would typically be nothing and the flat fee would be unchanged. The numbers are illustrative — the point is the shape: a percentage grows with the result, a flat fee does not.

Which fits your property

A flat-fee, self-file approach fits owners who are comfortable filing their own protest — which Texas law expressly allows — and who would rather pay a small fixed amount than share a percentage of any reduction. Representation on contingency fits owners who prefer to hand the entire process to a firm and are willing to give up a share of the result to do so. Many owners with larger or multi-parcel portfolios find the flat-fee math especially favorable, because a percentage of a large reduction, repeated across many parcels and years, adds up. Corriden serves the first group: a free parcel check first, then a flat-fee evidence packet you file yourself, or a Season Pass for a portfolio. For the mechanics, see how the self-file protest process works.

Questions owners ask

How does contingency pricing for a property tax protest work?

A contingency consultant is paid a percentage of the tax reduction they obtain — commonly around 25% to 50% of the first year's savings, depending on the firm and the property. If no reduction results, there is typically no fee. The trade-off is that when a reduction does result, a share of it goes to the consultant every year they handle the account.

What is a flat-fee model?

A flat fee is a fixed price that does not change with the result. You pay the same amount whether the protest produces a large reduction, a small one, or none at all. Corriden's evidence packet is priced this way — a fixed fee for the analysis and materials — and it is never a percentage of any reduction.

Which model is cheaper?

It depends entirely on the size of the reduction, which no one can promise in advance. A flat fee is a known, small, fixed cost. A contingency fee is unknown up front and scales with the result — inexpensive if the reduction is small, but a large recurring cost on a big reduction. The larger the potential reduction, the more a percentage-based fee costs relative to a fixed one.

Does a flat fee mean I do the work myself?

With a self-file evidence packet, yes — you review the analysis and file your own protest, which is exactly what Texas law lets every owner do. That is the source of the cost difference: you are paying for the analysis and materials, not for someone to represent you. Owners who want representation can hire a licensed consultant or attorney of their own choosing, on whatever terms they agree.

Is Corriden a consultant I'm hiring to protest for me?

No. Corriden is software that produces a self-service evidence packet from public appraisal-roll data. It does not file, represent you, negotiate, or appear before any appraisal district or review board, and it is never your designated agent — you act for yourself. Its fee is flat and is never tied to any outcome.

Check a real parcel.

The free estimator on the homepage runs the same $/SF-versus-comparables comparison on your numbers — an illustrative, informational estimate, in about a minute.

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