Customs recently issued a message on their Cargo Systems Messaging Services concerning Automated Commercial Environment (ACE) accounts.
The message read:
This is a reminder that CBP bills for supplemental duties, taxes and fees, or vessel repair duties are due thirty (30) days from the date of the bill. Any bill not paid during this timeframe is delinquent. Please ensure that CBP has the correct address on file in order for you to receive your bill in a timely manner to prevent any delay in the payment of your bill.
If a bill remains unpaid, any balance will be considered delinquent and accrues interest until payment is made in full. All supplemental bills will reference the entry number used to import your goods.
Also, please note that CBP is changing its dunning letter timeframe from 181 days from the date of the bill to 61 days starting September 5, 2017. In addition, if you are scheduled to receive a refund and have a delinquent bill older than 60 days, CBP will divert your refund and apply it to the delinquent bill.