The 12-Week Rule: Temporary SMF Cover Explained

What the 12-Week Rule Actually Allows

Where an SMF role becomes vacant unexpectedly — through resignation, incapacity, or another genuinely unforeseen absence — a firm can arrange for someone else to perform that function on a temporary basis for up to 12 weeks without that individual needing separate FCA approval for the role, provided the arrangement genuinely fits within the rule’s conditions. This exists specifically to prevent an unplanned departure from leaving a firm with no one legitimately able to perform a critical function while a proper, permanent or interim replacement goes through the full approval process.

What Changed in April 2026

Under the Phase 1 SMCR reforms that took effect on 24 April 2026, the rule changed in two important ways:

In practice this makes a properly considered interim appointment much more achievable, because the firm no longer needs approval to arrive within the 12 weeks. It does not remove the need to move quickly: the application must still be submitted within the window. The rules are in the FCA Handbook at SUP 10C.3, and our guide to the SMCR reforms covers the wider changes.

The Conditions That Actually Matter

The vacancy must be genuinely unforeseen

The rule is built around unexpected absence, not planned transitions. A firm that knows an SMF holder’s departure is coming — a resignation with reasonable notice, a planned retirement, the end of a fixed-term arrangement — is expected to have a proper succession or replacement process already underway well before the departure date, using the realistic timeline principles we set out elsewhere on this site, rather than relying on the 12-week rule as a substitute for planning ahead.

The clock starts running immediately

The 12-week period begins from the point the vacancy actually arises, not from whenever the firm gets around to formally arranging cover. Firms that delay putting a covering arrangement in place, whether through administrative slowness or uncertainty about who should step in, are burning through the available window without gaining any benefit from it.

The individual providing cover still needs to be suitable

The 12-week rule removes the requirement for individual FCA approval — it doesn’t remove the firm’s own responsibility to ensure the person covering the role is genuinely capable of performing it. A firm that puts a clearly unsuitable individual into temporary cover, purely because the rule technically permits it without approval, is taking on real operational and reputational risk even though it isn’t technically breaching the approval requirement itself.

The role’s actual responsibilities during cover need to be genuinely appropriate

Temporary cover under the rule is intended for exactly that — genuinely temporary, stop-gap cover — not as a mechanism for someone to permanently absorb an SMF’s full responsibilities indefinitely without ever going through proper approval. A firm using the rule as intended keeps the covering individual’s actual activity appropriately scoped to bridging the gap, rather than expanding it into a de facto permanent appointment under cover of the temporary provision.

What Happens When the 12 Weeks Run Out

If the person covering is to continue beyond 12 weeks, the firm must have submitted an approval application for them, or for a permanent or interim replacement who will take over, within the 12 weeks. Once an application is in, the person covering can stay in post until the FCA determines it. If no application has been submitted by the end of the window, the temporary cover must stop, leaving the firm without anyone able to perform the function, which is exactly the gap the rule exists to prevent.

That is why the 12 weeks should be treated as a firm deadline for having an approvable candidate chosen and an application ready, not as a comfortable buffer. In practice that means starting an interim or permanent search the day the vacancy arises. Our urgent SMF replacement service is built around that first fortnight.

How This Connects to Fractional and Interim Arrangements

The 12-week rule is often the mechanism that bridges an unexpected departure into a properly structured interim or fractional arrangement, of the kind we discuss in our guide to interim and fractional SMF appointments. A firm can use the 12-week window to identify and begin approving a genuine interim SMF holder — someone who will then hold the role through the FCA’s normal approval process — rather than needing to have that interim candidate already approved and waiting on the day the vacancy arises. Used this way, the rule is a genuinely useful bridge rather than a loophole, provided the firm moves with real urgency during the window rather than treating it as slack in the system.

A Practical Plan for the 12 Weeks

For the compliance and MLRO roles, where most unexpected departures happen, see interim SMF16 and SMF17 cover and our guide to what to do when your MLRO resigns.

What Firms Get Wrong

The most common misuse we see is firms treating the 12-week rule as available for planned transitions where it was never intended to apply — using it to avoid the inconvenience of running a proper approval process in advance of a known departure date, rather than reserving it for genuinely unexpected gaps. Firms that lean on the rule for planned transitions are taking on more regulatory risk than they realise, since a supervisor reviewing the circumstances of the vacancy is likely to ask directly whether it was actually unforeseen.

The second common mistake is waiting too long to start a search, on the assumption that 12 weeks is plenty. Searches, references and a well-prepared application together take most of that time. Our fractional and interim SMF cover service focuses on candidates who are available immediately and approvable, so the application can go in well inside the window.

Frequently Asked Questions

Can the 12-week rule be used for a planned departure?

It is designed for absences that are temporary or reasonably unforeseen. Where a departure is known well in advance, the firm is expected to plan a properly approved successor.

Does the person covering need to be approved?

Not for the first 12 weeks. To continue beyond that, an approval application must be submitted within the 12 weeks; they can then stay in post until the FCA decides.

Do the Conduct Rules apply to the person covering?

Yes. Since April 2026 the Senior Manager Conduct Rules apply to someone performing an SMF role under the 12-week rule.

Can the rule be used more than once?

It covers up to 12 weeks in any consecutive 12-month period for the same function, so it is not a way to keep extending cover.