Your Defendant Can Now Pull Claimants Out of Arbitration. What Does That Do to Your Completion Math?

I want you to look at a single sentence buried in TaxAct's updated Terms of Service. It says that if a mass arbitration is commenced, TaxAct reserves the right to opt individual disputes out of arbitration and compel them into court in Dallas County, Texas.

Read that again. The defendant gets to pull your claimants out of the arbitration, one by one, and send them to court instead.

This is not hypothetical. TaxAct published it. And if you have been paying attention to the clause-drafting arms race in mass arb over the past six months, you know TaxAct is not inventing something new. They are formalizing a move that defense counsel has been workshopping since late 2025. The question for plaintiff firms is not whether this clause will spread. It is what it does to the math you are already running.

The Static Pool Assumption

Most plaintiff firms model completion against a fixed denominator. You sign 8,000 claimants. Your settlement agreement requires 85% to complete releases. So you need 6,800 completed releases, and you build your outreach cadence around getting there inside 180 days.

That model works when the pool stays at 8,000. It breaks the moment someone starts removing claimants from it.

Here is why. Suppose the defendant exercises an opt-out right on 500 of your claimants, routing them to individual court proceedings in a distant venue. Those 500 are no longer part of the mass arb settlement pool. Your denominator just dropped to 7,500. Your 85% threshold is now 6,375 instead of 6,800.

Sounds like it got easier, right? Fewer people to chase. But that is only true if the defendant is pulling claimants randomly. They are not.

Which Claimants Get Pulled

Think about who the defendant opts out. Not the claimant who already signed their release in week two. That person is done. The defendant targets claimants who are either (a) the strongest individual cases that could set unfavorable bellwether precedent, or (b) the hardest-to-reach claimants who are dragging your completion rate down anyway.

In scenario (a), the defendant is trying to weaken your bellwether pool and remove cases that would produce outsized individual awards. That is a litigation strategy problem, and your trial team handles it.

In scenario (b), the defendant is doing something more subtle and more dangerous to your economics. They are removing the exact claimants whose non-responsiveness was going to cost you the most outreach dollars per completed release. When those hard cases leave the pool, your remaining denominator looks easier on paper. But the defendant just handed those 500 people a reason to disengage entirely, because now they have to litigate in Dallas County instead of signing a two-page release on their phone.

The net effect: your completion rate on the remaining pool might tick up, but you have permanently lost the economic value of those removed claimants. And if the defendant times the opt-out strategically (say, at day 90 of your 180-day window), you have already spent outreach dollars on people who will never convert inside your campaign.

The Real Cost: Wasted Outreach on a Moving Target

This is where the completion economics get painful. In a standard mass arb completion campaign, your per-claimant outreach cost is not evenly distributed. The claimants who sign in the first 30 days cost you almost nothing per touch. Maybe two SMS messages, one email, and they are done. The claimants who sign in month four or five cost you 15 to 20 touches across SMS, email, AI voice, and sometimes live calls.

When a defendant pulls 500 claimants out at day 90, you have already invested in early-wave outreach to all of them. That spend is sunk. And the claimants who remain but have not yet completed are disproportionately the expensive ones. Your cost-per-completed-release on the surviving pool goes up, not down, even though the denominator shrank.

Run the numbers on a 10,000-claimant matter with an $11.99 per-claimant admin cost. If 500 get pulled after 90 days, you have spent roughly $6,000 in admin fees on claimants who will never complete. That is not catastrophic on its own. But layer it on top of your sunk ad spend, intake cost, and filing fees for those 500, and you are looking at $125,000 to $200,000 in total acquisition and administration cost that just evaporated.

How to Model a Shrinking Pool

If you are evaluating a matter where the defendant's clause includes any flavor of unilateral opt-out, you need to adjust three things in your case model before you spend a dollar on acquisition:

1. Build a pool-attrition scenario. Model three cases: no opt-outs, 5% opt-out, and 10% opt-out. For each, recalculate your threshold denominator and the resulting number of completions needed. If the matter does not pencil at a 10% attrition rate, you need to either negotiate the threshold lower or walk away.
2. Front-load your outreach intensity. If the defendant can pull claimants at any point, the economic value of a day-seven completion is higher than a day-120 completion, because the day-seven signer cannot be removed. Every week you wait to engage a claimant is a week the defendant could yank them. This is why the firms that treat completion like a sales funnel (with urgency built into the first 30 days) outperform the ones that send a notice and wait.
3. Track your cost-per-completed-release in real time, not at the end. If you are only calculating completion cost at close, you will not see the damage from mid-campaign attrition until it is too late. Weekly dashboards showing cost-per-release by cohort (week 1 signers, week 4 signers, week 8 signers) let you spot when an opt-out event has shifted your economics and adjust your outreach budget accordingly.

The Clause Is the Tell

TaxAct's clause is public. It is in their Terms of Service right now. And it explicitly references JAMS Mass Arbitration Procedures, which means they have already mapped the procedural framework they intend to operate under. That is a level of defense-side preparation that most plaintiff firms are not matching on the intake side.

The broader signal is this: the era of filing 10,000 claims and assuming you will complete 85% of them against a static pool is ending. Defendants are building mechanisms to move the denominator. Plaintiff firms that model completion as a fixed math problem will keep getting surprised by the variable one.

The firms that win in this environment are the ones that can move faster than the defendant can shrink the pool. That means outreach infrastructure that hits claimants early, hits them often, and converts them before anyone has a chance to reclassify them out of the case.

Harry Hedaya is the founder of Send It By Text, the native document signing, SMS, and email platform behind GroupSettle's mass arbitration completion stack. Their AI super agent handles over 80% of claimant inquiries on its own, which lifts engagement rates further. He works with plaintiff firms running live mass arb campaigns.