Does the fax timestamp count as my filing date?

By Mohamed Younis, Operations, Apellica. Last reviewed 2026-05-22.

Yes. Under federal mailbox rules (Rosenthal v. Walker, 111 U.S. 185) and ERISA case law applying the same principle (Schikore v. BankAmerica), a complete fax transmission to the carrier's published appeals number on a given date is the filing date for that appeal, even if the carrier does not internally process the document until later. Your transmission receipt is the evidence.

Many DIY appellants worry that an appeal does not 'count' until the carrier opens and processes it. The law is clearer than the carrier customer-service script suggests. Once the appeal leaves your hand and arrives at the carrier's designated intake channel, the filing is complete for purposes of the appeal-deadline clock.

The mailbox rule comes from common-law contract doctrine. The Supreme Court formalized it in 1884 in Rosenthal v. Walker, 111 U.S. 185: a notice properly addressed and sent through a recognized delivery channel is presumed received in the ordinary course of business. The rule has been applied to fax, registered mail, certified mail, and (in some jurisdictions) email. The key elements are: (1) the document was properly addressed; (2) it was sent through a channel the recipient accepts; (3) a transmission record exists.

Federal courts apply the mailbox rule to ERISA appeals filing dates. Schikore v. BankAmerica Supplemental Retirement Plan, 269 F.3d 956 (9th Cir. 2001), held that a fax received by the plan administrator on the deadline day constitutes timely filing even if the administrator's clerk did not log the document until later. The court reasoned that a contrary rule would allow the administrator to defeat the filing simply by delaying internal processing.

Practical consequences. If you fax on day 179 of the 180-day window and the transmission completes at 11:58 PM, the filing is timely. If the carrier opens the document on day 185 and stamps it 'received' on that date, the carrier's stamp is not controlling, your transmission receipt is. If the carrier's appeals desk rejects your appeal for untimeliness based on the internal stamp, you can compel reconsideration by producing the transmission receipt and citing Schikore.

Caveat: the fax must reach the carrier's correct appeals-intake number, not a general number. Sending to the wrong fax number is treated as never sent. The transmission receipt has to show the carrier's published appeals fax number as the destination, not a customer-service number that happened to answer the call.

Second caveat: complete transmission only. A fax that drops mid-document (transmission error code, partial pages, timeout) is not a complete filing. Save only receipts that show full delivery, all pages, OK status. If a fax drops, resend immediately and save both receipts.

Checklist before you send a fax appeal

Use the carrier's published appeals fax number.
Confirm the transmission receipt shows: destination number, completion timestamp, pages sent, OK status.
Save the receipt as a PDF named with the date and member ID.
If the carrier later disputes timeliness, cite Schikore v. BankAmerica.
If certain jurisdiction (state contract law applies), cite Rosenthal v. Walker.

If reading this is already too much: Apellica handles fax-and-everything-else appeals end to end. Apellica preserves your filing dates.