UNICORN PRIVATE How often should you rescreen customers and suppliers against sanctions lists?
Sanctions lists change without notice, often several times a week, so a check done at onboarding gets old fast. When to rescreen, what triggers a new check, and how to keep the whole base up to date.
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Short answer: as often as the lists change, which in practice means continuously or at least daily for the whole base, plus an immediate check before every payment, shipment or contract. A customer who was clean at onboarding can be designated next week, and the obligation not to deal with a listed party applies from the day of the listing.
Key definitions
Screening: comparing a name and its identifiers with official sanctions and watch lists.
Rescreening: repeating the check on existing customers and suppliers, not only new ones.
Event-driven check: a check triggered by something that happens, such as a new list update, a change of owner or a first payment to a new bank account.
Why lists change all the time
Sanctions authorities add, amend and remove entries whenever a government decides, without a fixed calendar. You can see this directly on the official pages:
| Authority | Official update page | What you see |
|---|---|---|
| US OFAC | Recent actions | A dated entry for every designation, removal or amendment |
| UK | UK Sanctions List | The page shows its last update date; on 5 November 2026 it showed 3 November 2026 |
| EU | EU consolidated list dataset | New file versions after each Council decision |
| UN | UN Consolidated List | Updated after each Security Council committee decision |
Pages checked on 5 November 2026.
Recommended frequency
| Situation | When to check |
|---|---|
| New customer or supplier | Before the first contract, order or payment |
| Whole existing base | Daily, or automatically every time an official list is updated |
| Payments to a new or changed bank account | Before the payment |
| Change of owner, director or address | As soon as you learn of it |
| High-risk countries or sectors | Daily plus enhanced due diligence |
| Dormant contacts | Before any reactivation |
These are practical recommendations, not legal requirements. Your own risk assessment and the rules that apply to you decide the final frequency.
run a free name check against the official lists
Step by step: setting up rescreening
- Build one list of all counterparties. Customers, suppliers, agents and their owners, from every system (CRM, accounting, ERP).
- Keep identifiers. Country, registration number and address reduce false matches when you rescreen.
- Choose the trigger. Daily batch, or a new run every time OFAC, the EU, the UK or the UN publish an update.
- Review only the changes. A good process shows new or changed matches, not the same alerts every day.
- Block before paying. Link the check to payments, so a newly listed supplier is stopped before money leaves.
- Keep a record. Date, lists, result and decision for each counterparty.
What happens when rescreening is missing
OFAC's Enforcement Guidelines list the existence and adequacy of a compliance programme among the factors used to set a penalty (source: 31 CFR Part 501, Appendix A). In April 2023 OFAC settled with Microsoft Corporation for USD 2,980,265.86 over 1,339 apparent violations, many involving sales through resellers to blocked parties that were not reliably identified (source: OFAC recent actions, 6 April 2023).
How to automate it
Unicorn Intelligence rescreens all your customers and suppliers every day against the official lists and sends an alert only when something new appears, also in your CRM or accounting software. It is an informational tool: legal decisions and obligations remain the company's.
Run a free test on all your contacts now and find out if there are any compliance issues.
Run a free test on all your contacts now and find out if there are any compliance issues.
New accounts also get a 50 $ credit.
FAQ
Is screening at onboarding enough?
No. A counterparty can be designated at any time after onboarding, and the prohibition applies from the date of listing.
Is there a legal rule that says how often to rescreen?
Sanctions laws generally prohibit dealing with listed parties without fixing a screening frequency. The frequency comes from your risk assessment and from guidance in your sector.
Why daily and not monthly?
Because official lists can change several times in a month. With monthly checks a newly listed supplier could be paid for weeks before you notice.
Should I rescreen suppliers as well as customers?
Yes. Paying a listed supplier is making funds available to it, which is prohibited just like selling to a listed customer.
What about the owners of my counterparties?
Ownership changes can make a company blocked under the 50% rule without any change to its own name, so owners should be rescreened too.
Do I need to recheck contacts that were cleared as false positives?
Yes, but a good system remembers the decision and alerts you again only if the list entry or your contact's data changes.
Where can I see when a list was last updated?
On the official pages: OFAC Recent actions, the UK Sanctions List page on GOV.UK, the EU open data portal and the UN Consolidated List page.
Sources
- https://ofac.treasury.gov/recent-actions
- https://www.gov.uk/government/publications/the-uk-sanctions-list
- https://data.europa.eu/data/datasets/consolidated-list-of-persons-groups-and-entities-subject-to-eu-financial-sanctions
- https://main.un.org/securitycouncil/en/content/un-sc-consolidated-list
- https://www.ecfr.gov/current/title-31/subtitle-B/chapter-V/part-501/appendix-Appendix%20A%20to%20Part%20501
- https://ofac.treasury.gov/recent-actions/20230406
Informative content: decisions and legal obligations remain yours.