Final Supplementary Declaration UK (FSD) — who must submit it and by when

What the Final Supplementary Declaration is — in one paragraph

The Final Supplementary Declaration UK (FSD) is an annual return confirming to HMRC that every frontier crossing made under a Simplified Frontier Declaration (SFD) or EIDR entry in the previous calendar year has been closed out with a full Supplementary Declaration in CDS. It contains no goods data and no duty amounts — it is a reconciliation return that says one thing: "number of SFDs and EIDRs this year = number of SDPs settled in CDS, balance at zero, nothing outstanding". The deadline is firm — 31 January of the following year — and the consequence of late filing is loss of the CFSP/SCDP authorisation, not just a financial penalty.

Every December and January the EasyClearance Team runs the reconciliation process for SCDP clients: SFD extract, SDP extract, 1:1 matching, gap closure and finally FSD submission. This is the moment when a single inconsistency from 11 months earlier can surface — which is why this guide focuses on the operational rules of the FSD rather than CFSP theory.

FSD versus Supplementary Declaration — two different obligations

The most common misunderstanding: "supplementary declaration" gets linked to the monthly SDP filed for each SFD. That is repeated tens of times a year, by the 10th of the month following import, in line with Using simplified declarations for imports — HMRC. The FSD is an entirely separate obligation — submitted once a year, containing only reconciliation data, and settling no duty or VAT. The distinction is worth remembering because the penalties for missing either differ.

Who MUST submit the FSD — full list of entities

The FSD obligation sits with the holder of the Simplified Customs Declaration Process authorisation. This means three categories of entity:

• Importer with its own SCDP authorisation — a UK-based business or one with a GB EORI that has received an SCDP authorisation number from HMRC and itself sends (or arranges the sending of) SFD/SDP entries under that number. The FSD obligation sits with this business, even if a customs agent technically transmits the declarations.
• Customs agent with its own SCDP authorisation (indirect representation) — an agent that brings clients under its own authorisation. In that case, one agent FSD covers all SFD/SDP entries for its clients in the given year. The client does not submit a separate FSD.
• Entity using EIDR (Entry in the Declarant's Records) — holder of an EIDR authorisation as part of SCDP that records imports in its books instead of submitting an SFD. EIDR is included in the FSD reconciliation in the same way as an SFD.

Who does NOT submit an FSD: (1) businesses without an SCDP authorisation (full declaration on entry), (2) clients of an agent that uses its own SCDP, (3) entities that did not bring a single consignment under SCDP in the reporting year (though it is worth submitting a "nil FSD" in that case — a zero return confirming no movement).

The 31 January deadline — why it is firm and carries no grace period

The Final Supplementary Declaration deadline is 31 January of the year following the reporting year. FSD for 2025 → by 31 January 2026. FSD for 2026 → by 31 January 2027. In practice, HMRC previously applied a deadline at the end of February, but from the 2025 cycle a single date of 31 January has been adopted for all SCDP holders, in line with the authorisation conditions issued in the CFSP decision and published in HMRC Notice — Using simplified declarations for imports.

The deadline is firm for three reasons. First, it is a condition of the authorisation — not "best practice". Second, HMRC needs all SCDP FSDs before the statistical year closes. Third, the FSD is compliance evidence that HMRC uses as an input to the SCDP audit programme — businesses with late or missing FSDs automatically enter the inspection queue. That is why the EasyClearance Team starts the client FSD process in mid-December, not January.

What the FSD contains — reconciliation of SFD/EIDR across the year

The FSD is a reconciliation document, not a goods declaration. It includes the following data:

The FSD carries no goods data, HS codes, duty or VAT amounts — this is a deliberate choice by HMRC: the aim is not to re-settle anything, but to obtain a statement that the cycle is closed. Internal reconciliation (1 SFD = 1 SDP) remains on the business's file and is subject to ex post inspection.

Consequences of late filing — revocation of CFSP authorisation

This is where the real cost of the FSD begins. HMRC escalates its response in stages, but the scale is serious:

• Delay 1–14 days — most commonly a written warning on the SCDP authorisation profile, a demand to submit the FSD immediately, and a note in the compliance history.
• Delay 14–60 days — administrative penalty (HMRC practice: a fixed penalty in the £1,000–£2,500 range, depending on turnover), request for a full reconciliation audit, automatic entry of the business into the SCDP monitoring programme for the next 12 months.
• Delay >60 days or repeat offence — initiation of the procedure to revoke the CFSP/SCDP authorisation under the HMRC authorisation conditions. The business loses the right to SFD and EIDR — every subsequent clearance requires a full CDS declaration at the frontier, meaning multi-hour waits at ports, higher agency costs and the risk of losing logistics contracts.
• On top of that — HMRC has the right to review every Supplementary Declaration from the reporting year retrospectively. If gaps appear in SDPs, it charges duty, VAT and a penalty — with no reduction for voluntary disclosure.

Losing the SCDP authorisation, in practice, marks the end of the fast-clearance model. For businesses importing multiple times a week via Dover/Felixstowe, that is several thousand pounds of additional monthly cost and delivery delays measured in days. The penalty for a missing FSD is always far greater than the cost of preparing the FSD itself.

How the EasyClearance Team runs a client's FSD — 6 steps

1. December: mid-year audit — before year-end we run a matching test of SFD ↔ SDP for the first 11 months. Any gaps are closed while the tax year is still active.
2. January, weeks 1–2: annual extract from CDS — we pull the full lists of SFDs, EIDR entries and SDPs for the entire previous calendar year, in line with the CDS completion requirements for SCDP.
3. January, week 2: 1:1 reconciliation — we check that each SFD MRN matches an SDP MRN. Discrepancies (typically 0.3–1% of volume) are closed immediately.
4. January, week 3: DDA reconciliation — we compare the Duty Deferment Account balance with the total duty/VAT from the SDPs. Any difference larger than a rounding error is escalated to HMRC before the FSD.
5. January, weeks 3–4: FSD preparation — we complete the SCDP form with volume figures and the statement. The client approves the content and signs electronically.
6. By 31 January: submission and archiving — the FSD is sent to HMRC; submission confirmation and a copy are kept on the client's SCDP file for 6 years.

Most common pitfalls that cost you the authorisation

Five patterns that in our experience most often lead to a late or missing FSD:

1. Change of agent mid-year — a business moves from one agent to another in June and no one takes over the FSD obligation. In January it turns out neither the old agent nor the new one considers it their responsibility. Remedy: a written agreement on who submits the FSD at every change of representation.
2. Gaps in SDPs — several dozen SFDs from November and December without a corresponding SDP by 10 January. The FSD will then show a non-zero balance and HMRC will open an audit.
3. EIDR entries omitted from the return — businesses using EIDR often treat it as "not a declaration". For the FSD, EIDR counts the same as an SFD and leaving it out misstates the reconciliation.
4. New authorisation mid-year — a business is granted SCDP in July. The FSD for that year only covers the July–December period, but the 31 January deadline still applies.
5. Missing "nil FSD" — a business with an active authorisation that did not use SCDP in the given year should still submit an FSD with zero volume. HMRC reads the absence of an FSD as non-compliance, not as inactivity.

What follows from the current official rules

The Final Supplementary Declaration UK (FSD) is an annual obligation for every holder of a CFSP/SCDP authorisation — the 31 January deadline, falling in the year after the reporting year, is firm and carries no grace period. The FSD is a reconciliation return, not a goods declaration: it sets the total number of SFDs/EIDR entries against the total number of Supplementary Declarations and confirms that the figures balance. The obligation sits with the authorisation holder — an importer holding its own SCDP, or a customs agent operating under its own authorisation. Late-filing consequences escalate: from warning, through administrative penalty, to revocation of the CFSP authorisation and retrospective duty/VAT for SDP gaps in the reporting year. The most common pitfalls are SDP gaps, omitted EIDR entries, a mid-year change of agent and a missing "nil FSD" at zero volume. This article reflects the position as at 2026-04-19 and does not replace advice from a customs agent. If you hold an SCDP authorisation and want the EasyClearance Team to run the annual reconciliation and submit the FSD on your behalf: WhatsApp +44 7404 091 503, 24/7.

FAQ — frequently asked questions

What is the Final Supplementary Declaration in the UK?

The Final Supplementary Declaration (FSD) is an annual return submitted to HMRC that confirms every Simplified Frontier Declaration (SFD) or EIDR entry from the previous calendar year has been closed out by a separate Supplementary Declaration in CDS. The FSD carries no new goods data — it is a reconciliation return (volume + balance) and the evidence that a CFSP/SCDP authorisation holder has met the obligation to complete frontier clearances with full declarations.

Who must submit an FSD in the UK?

The FSD must be submitted by every holder of a CFSP/SCDP (Simplified Customs Declaration Process) authorisation who brought goods into the UK via SFD or EIDR in the previous calendar year — regardless of volume. The obligation covers importers operating under their own authorisation as well as customs agents holding their own SCDP authorisation. You do not submit an FSD as a client if you are using an agent's authorisation — the agent submits the FSD in that case.

What is the FSD submission deadline in the UK?

The deadline is 31 January of the year following the reporting year. The FSD for 2025 must be submitted by 31 January 2026, for 2026 — by 31 January 2027. The deadline is firm — HMRC does not apply an automatic extension. Earlier arrangements (end of February) have been tightened; from 2025 the 31 January date applies to all SCDP holders.

What happens if I do not submit the FSD on time?

Missing the FSD deadline is a serious breach of the CFSP/SCDP authorisation conditions. HMRC may impose an administrative penalty, issue a warning on the authorisation profile, and — where delays are repeated or the FSD is entirely missing — revoke the SCDP authorisation. Losing the authorisation means every clearance must be completed with a full CDS declaration at the frontier and there is a risk of retrospective duty/VAT being charged for gaps in Supplementary Declarations from the reporting year.

Is the FSD the same as a Supplementary Declaration?

No. A Supplementary Declaration (SDP) is the full customs declaration submitted for every SFD in CDS by the 10th day of the month after import — it contains the exact value, the full 10-digit HS code and settles duty/VAT. The Final Supplementary Declaration (FSD) is the annual return at year-end — it confirms that every SFD from the given calendar year has a matching SDP. SDPs number in the tens or thousands per year; an FSD is submitted once.

How is the FSD submitted technically?

The FSD is submitted to HMRC via the dedicated SCDP Final Supplementary Declaration form — currently available through the SCDP/CDS portal and via an email channel to the HMRC CFSP team, in line with the instructions received with the authorisation. The content covers authorisation details (SCDP number, EORI), the reporting year, the number of SFD/EIDR entries submitted, the number of SDPs, a confirmation that the figures balance and a statement that no Supplementary Declarations remain outstanding.

Can a customs agent submit the FSD on a client's behalf?

If the customs agent operates under its own SCDP authorisation and brings clients under that authorisation, the agent submits the FSD — a single FSD then covers all activity under the agent's SCDP number. If the client holds its own SCDP authorisation and the agent only transmits the SFD/SDP technically, the FSD obligation sits with the client. The EasyClearance Team always confirms which representation model applies before taking responsibility for the FSD deadline.

Official sources

• Using simplified declarations for imports — HMRC
• Apply to use simplified declarations for imports (SCDP) — HMRC
• CDS completion requirements for Simplified Customs Declaration Process — GOV.UK
• UK Trade Tariff Volume 3 for CDS — GOV.UK
• HMRC Customs, International Trade and Excise Enquiries — contact