This is the rule that carriers wish weren't true. The §542.058 60-day deadline doesn't apply once per claim — it applies each time the carrier receives new information triggering a payment obligation. A supplement is, in §542 terms, a new demand on the carrier under the policy. The carrier has up to 60 days from receipt of the supplement (and the documentation it reasonably needs) to accept and pay, reject with reasons, or properly extend under §542.059.
The same Barbara Technologies analysis that controls the original claim's trigger date controls the supplement's trigger date. The carrier cannot keep requesting documents to indefinitely toll the clock. Once they have what they reasonably need on the supplement, the 60 days runs.
The Prompt Payment of Claims Act looks to the date of the carrier's compliance, not the date the file was first opened. Each time the carrier owes payment under the policy and fails to make it timely, the statute is breached.
— Application of §542.058 to supplemental demands
Hinojos applies to supplements. If a supplement goes to appraisal and the panel's number exceeds the carrier's pre-appraisal supplement payment, §542.060 interest accrues on the underpaid portion from the supplement's original 60-day deadline through the date of full payment. The 2021 Texas Supreme Court holding doesn't carve out supplements from its rule.
Multiple supplements compound. On a long-tail file, you can have the original claim, supplement #1 (decking, three months in), supplement #2 (mold, eight months in), and supplement #3 (final code true-up, eighteen months in) — each with its own potential interest period. The math on a file like that doesn't add; it stacks.
A practical implication: limitations issues become decisive. Most Texas property policies impose a contractual limitations period (often two years from date of loss for the right to sue), and Tex. Civ. Prac. & Rem. Code §16.051 sets a four-year statute on contract claims generally. The longer the file stays open and the further out the supplements run, the more carriers will reach for limitations defenses. Documenting the chain — original loss, original notice, each supplement, each carrier response — preserves the ability to recover the interest that's accrued.