Texas Diminished Value Demand Letter: How to Get Paid (2026)

Someone else wrecked your car. Their insurer paid the body shop, the dents are gone, and as far as they're concerned the file is closed. But it isn't, is it — because the moment that crash hit your car's history, the resale value dropped by thousands. That drop has a name: diminished value. And in Texas, the at-fault insurer owes it to you. Try collecting it by phone and you already know how that goes. "We'll look into it." "Send us the documentation." A week passes, then a month, and the claim quietly dies — which is exactly what they're counting on. A demand letter ends that. It's a written request that puts your number on the table, backs it with proof, and gives them a date to answer by. No more "we'll look into it." Just a bill, in writing, that they have to deal with.

The short version

The at-fault insurer owes you the resale value your car lost — but only if you ask in a way they can't ignore. A demand letter is that ask. It's not a rant; it's a calm, documented bill for money that's already yours.

The letter that gets paid carries five things: your appraised diminished value figure, the proof behind it, the claim number, a firm deadline, and certified-mail proof it landed. Leave out the appraisal and you're just asserting a number — and Texas adjusters deny those without blinking.

Do this first: get a professional appraisal before you write a single line. The letter is just the envelope. The appraisal is what makes it pay.

What a demand letter actually is

It's a formal written request to the at-fault driver's insurer — it states what you're owed for diminished value and demands payment by a set date. That's all it is. What makes it work is what goes inside. Think about why writing beats calling. On the phone, your number is just something you said; they can forget it, lose it, or wait you out. On paper, it's a documented demand with proof attached and a clock running — and Texas already says they have to engage with it. The Texas Department of Insurance, in Bulletin B-0027-00, confirmed an insurer can owe a third-party claimant for lost market value no matter how perfect the repair. Your letter is how you hold them to that.

The five things your letter needs

Miss any one of these and you hand them a reason to stall. Get all five in and there's nothing left to dodge.

The claim number and who's who. The existing claim number, the accident date, the at-fault driver, and your vehicle — year, make, model, VIN. And be clear it's a third-party claim: you're billing their insurer, not your own.
Your number — and it has to come from an appraisal. State a specific dollar figure, and make it a certified appraiser's, not your own estimate. An adjuster will argue with "my car is worth less" all day. They won't argue with a USPAP appraisal — that's the national standard appraisers work to, the kind a judge would take seriously. This one line is the difference between a check and a denial.
The proof, attached. The accident report, the final repair invoice, photos of the damage, your vehicle history report showing the wreck, and the appraisal itself. They should be able to verify every word without picking up the phone.
A deadline that bites. Give them 30 days to respond in writing. A date turns "we'll look into it" into something you can hold them to — and sets up your next move if they blow past it.
Certified mail, return receipt. Send it certified, with return receipt, so you've got dated proof it arrived. That little green receipt matters later, if this ends up in front of a regulator or a judge.

The Texas details that put weight behind it

Watch the two-year clock. A Texas property-damage claim — and diminished value is one — has to be filed within two years of the accident (Civil Practice & Remedies Code § 16.003). That's tighter than a lot of states. You don't put this in the letter as a threat; it just means you send it well inside that window, while the evidence is still fresh and nobody can wave you off.

Lead with market value, not their 17c. Texas doesn't require any one formula, so adjusters fall back on the old "17c formula" — an insurer shortcut that caps your loss near 10% of the car's value and then shaves it down from there. Your appraisal should use real market data instead: actual trade-in offers, dealer appraisals, comparable Texas listings. Say in the letter that your figure is market-based, and you've quietly told them their 17c counter won't survive. (See exactly how 17c shrinks your payout.)

Name the bulletin. One line referencing TDI Bulletin B-0027-00 tells the adjuster you know their duty to a third-party claimant is settled law in Texas — and that you're not the kind of claimant who gives up after the first no.

How to lay the letter out

One page, calm and factual. Something the adjuster can read in thirty seconds:

Open with the claim number, accident date, and that you're claiming diminished value as the third-party claimant.
The number: "Based on the attached USPAP appraisal, the diminished value of my vehicle is $X." One sentence — no hedging.
The basis: a short paragraph — market-based appraisal, accident on the permanent record, all of it backed by the attached evidence.
The demand: "I request payment of $X within 30 days of the date of this letter."
The close: a plain line that you'll pursue your remedies — including a complaint to the Texas Department of Insurance — if there's no response. No threats. Just the next step, stated like you mean it.

What happens after you send it

Brace for a lowball or a flat denial first. That's the opening move, not the final answer — usually a 17c number sitting well below your appraisal. Don't fold. Counter in writing and make them justify their figure against your market-based one. A number their own state walked away from doesn't hold up under that question for long.

If they go quiet past your deadline, you've got two cheap ways to push. A complaint to the Texas Department of Insurance is free, and insurers move differently once a regulator is on the file — they don't want the attention. And Texas Justice Court handles claims up to $20,000 on your own, which covers just about any diminished value claim. Your certified-mail receipt and your appraisal are the spine of either path.

When the loss is big, fault is in dispute, or the insurer is flat-out stonewalling, it's worth talking to a lawyer — Texas's deceptive-practices law can push your legal fees onto an insurer that handles your claim in bad faith, which can make a strong case cost you little up front. (Our full Texas diminished value guide walks the whole claim, start to finish.)

Quick answers

Do I really need an appraisal before I send it?
For any claim you actually mean to win, yes. Texas insurers deny figures that aren't backed by a professional appraisal almost on autopilot. A letter without one is just you saying a number.

Whose insurer — mine or theirs?
Theirs — the at-fault driver's. Diminished value is a third-party claim in Texas. Your own collision coverage pays to fix the car, not to make up its lost market value.

How long do I have?
Two years from the accident date (Civil Practice & Remedies Code § 16.003). Send it well inside that window — the fresher the evidence, the harder it is to deny.

What if they just ignore my deadline?
File a complaint with the Texas Department of Insurance, or take it to Justice Court (up to $20,000, no lawyer needed). That certified-mail receipt proves the letter went out and the clock started.

Bottom line

The at-fault insurer owes you the resale value that crash destroyed — but a phone call won't pry it loose. A demand letter will: a specific appraised figure, the proof behind it, a 30-day deadline, sent certified. Plain, documented, hard to dodge.

Today, get the appraisal — the letter is only as strong as the number in it. This week, write the one-page demand, attach your evidence, and mail it certified. Expect the 17c lowball, answer it with your market-based figure, and remember Justice Court is sitting right there if they won't pay what your evidence already proves.