The Monthly SDP Close
Routine keeps you compliant
Authorisation gets you into SDP. A steady monthly routine keeps you compliant. The supplementary declaration is where the full detail lands, and it usually falls due by the fourth working day of the month after release. Miss it, and you risk penalties and a mark against your compliance record.
The simple rhythm
Because the supplementary entry drives the duty calculation, accuracy matters as much here as at the frontier. The supplementary declaration process for SDP explains why. Keep a simple rhythm: reconcile the month's frontier entries, complete each supplementary declaration, then check the duty totals against your deferment statement before the deadline. Good software carries frontier data forward, which reduces rekeying and error. Treat it like payroll: same steps, same dates, no surprises.
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