# Late ISFs — What must pass before the next step: mandated step order in regulated processes

For Late ISFs, process is Importer Security Filing (ISF); jurisdiction is United States (CBP); deadline is at least 24 hours prior to the vessel departure, recorded from its source on 2026-08-11.

- **Step:** Late ISFs _(verified: appears in the quote below)_
- **Process:** Importer Security Filing (ISF) _(our reading, not quoted from the source)_
- **Jurisdiction:** United States (CBP) _(our reading, not quoted from the source)_
- **Deadline:** at least 24 hours prior to the vessel departure _(verified: appears in the quote below)_

## What the source says

> H. Late ISFs 1. If an ISF is filed the day of the vessel sail date, will there be a fine or enforcement of some kind? Because the ISF is required at least 24 hours prior to the vessel departure, a filing that is completed the same day the vessel sails will be considered a violation and it can be expected that CBP will issue a claim for an untimely filing. CBP uses the vessel departure date minus 24 hours to measure timeliness.

## Source

- https://www.cbp.gov/sites/default/files/assets/documents/2018-Nov/Updated%20ISF%20FAQ%20FINAL%2011282018.pdf

Last verified: 2026-08-11. Review by: 2027-08-11.
Part of [What must pass before the next step: mandated step order in regulated processes](https://referencesource.org/prerequisite-sequencing-regulated-processes/).