According to the Order published on legislation.gov.uk, HM Treasury made the Finance Act 2009 (Section 101) (Vaping Products Duty) (Appointed Day) Order 2026 on 14 September 2026, signed by Claire Hughes and Christian Wakeford. Its effect is narrow but commercially important: 1 October 2026 is the date from which the late payment interest rules in section 101 of the Finance Act 2009 will apply to vaping products duty. For Market Pulse UK readers, that turns a technical commencement order into a cashflow issue. The duty itself was already on the agenda under the Finance Act 2026; this instrument fixes the point at which paying HMRC late can begin to carry an interest cost.

The legal change does not create a new interest system from scratch. Instead, it switches on an existing HMRC regime for this part of the excise system. Section 101 of the Finance Act 2009 already applies more widely to sums due to HMRC but paid after the deadline, and this Order extends that treatment to vaping products duty and certain related penalties. That distinction matters because businesses do not need to learn a wholly new set of rules, but they do need to apply familiar HMRC payment discipline to a new duty area. A missed payment from 1 October 2026 will not simply be late; it can start to accrue interest.

The immediate audience is likely to be importers, manufacturers, wholesalers and any finance team responsible for settling vaping duty liabilities. With the Order made on 14 September and taking effect on 1 October, the gap between announcement and commencement is short. Firms that have treated vaping duty as a policy story now need to treat it as an operational deadline. In practice, that means checking payment calendars, approval chains and working capital assumptions before the first October liabilities fall due. For smaller operators especially, even routine delays between tax calculation, sign-off and bank payment can become more expensive once interest starts running.

The wording also brings penalties under Part 4 of the Finance Act 2026 into scope. That broadens the issue beyond the duty charge itself. If HMRC assesses a penalty and the amount is not paid on time, the late payment interest rules can apply there as well. For management teams, this is a reminder that compliance costs do not stop at the headline duty bill. Record-keeping, product classification, return accuracy and payment timing all sit in the same commercial picture, because errors can move from administration to cost very quickly.

The Order's explanatory note makes clear that the applicable interest rate is not set out in this instrument. Instead, legislation.gov.uk points readers to the Taxes and Duties, etc (Interest Rate) Regulations 2011, as amended in 2025. In other words, the start date is new for vaping duty, but the rate-setting machinery sits elsewhere in tax law. The note also says no Tax Information and Impact Note has been prepared because this is an appointed day order giving effect to previously announced policy. That will not surprise tax specialists, but it does mean businesses need to do a little more of the practical reading themselves rather than expecting a fresh policy paper to spell out the commercial effect.

For retailers and distributors further down the chain, the change may still matter even where they are not the party paying the duty directly. Suppliers facing tighter funding pressure or stronger compliance controls can pass that through in payment terms, stock planning and pricing decisions. That is often how technical excise changes show up on the ground. The message from this Order is straightforward. From 1 October 2026, vaping products duty joins the late payment interest regime already used elsewhere by HMRC. For affected firms, the sensible move is simple: tighten payment processes now, because from October, lateness has a clearer price.