The Christmas Gap Ledger: Should Your SME Open Between Boxing Day and New Year?

For UK SME owners, the festive calendar is already a spreadsheet. In 2026, Christmas Day falls on Friday 25 December, Boxing Day on Saturday 26 December and the substitute bank holiday on Monday 28 December. That leaves three ordinary working days — Tuesday 29, Wednesday 30 and Thursday 31 December — before New Year’s Day on Friday 1 January 2027. The question is not whether to celebrate. It is whether those days, and the surrounding bank holidays, should be traded, closed or run at reduced service.

Too often the answer is neither strategy nor accident. A few staff volunteer, the phones are diverted, the out-of-office goes on and the business drifts through a week that still carries rent, rates, software subscriptions and salaried payroll. A costed decision is better than an inherited habit.

Define the choice before costing it

There are three realistic options. Full closure means no customer-facing activity and no routine operations. Reduced service means a skeleton team, limited hours or enquiry-only cover. Full trading means normal hours, or close to them, with the staffing and supplier support that implies.

Each option has a different cost profile. Closure avoids some variable costs but rarely avoids fixed ones. Reduced service protects responsiveness but can be the most expensive per hour worked. Full trading captures demand but may require overtime, agency cover and management attention at a time when both are scarce.

The baseline costs that do not disappear

Start with the costs that survive every option. Rent, business rates, insurance, service charges, finance payments, software licences and energy standing charges continue whether the office is busy or dark. A useful baseline is monthly fixed premises and administrative costs divided by 31. For an illustrative 18-person firm with £42,000 of monthly fixed costs, that is about £1,355 per calendar day.

Salaried payroll sits on top and is largely unchanged by a decision to close. The avoidable costs are narrower: hourly-paid hours not worked, agency cover not booked, heating and lighting not used, cleaning and catering reduced, and some transaction or delivery costs avoided. The ledger should separate unavoidable from avoidable costs before any revenue assumption is made.

Staffing costs: check contracts, not folklore

There is no statutory right to extra pay for bank holidays in the UK. Entitlement and premium pay depend on contracts, staff handbooks and established practice. Acas guidance is a sensible reference, but the employment contract governs. Owners should check holiday balances, bank holiday clauses, guaranteed hours and any custom of paying overtime for festive work.

For hourly-paid staff, the calculation is straightforward but easy to underestimate. Two customer-service staff at £14 an hour for 7.5 hours cost £210 in basic pay. Add roughly 15 per cent for employer National Insurance and pension contributions and the figure is about £242. At time-and-a-half, it becomes about £363. Agency cover at £22 an hour would cost £330 before any margin or VAT treatment. Those figures should be compared with the gross profit the cover is expected to generate, not with the revenue alone.

Premises and utilities: modest savings, real risks

Closing does not switch off rent, rates or insurance. Energy standing charges also continue. The avoidable element is mainly gas and electricity for heating, lighting and equipment, plus cleaning and catering. For many SMEs the saving is real but smaller than the invoice suggests.

Empty premises bring their own costs. Insurance conditions may require daily checks, alarm response and frost protection. Turning off heating entirely can create damp, burst-pipe or equipment risks. A reduced service may allow zoned heating and a smaller occupied area, which is often more efficient than heating a full building for a handful of people.

Customers, cash and the cost of a silent inbox

Not every enquiry is equal. A B2B customer that also closes may not notice a quiet week. A trade counter, consumer-facing operation or client with a live project may go elsewhere if the inbox stays silent. The practical test is to list the top 20 customers and the live pipeline, then ask which enquiries would be lost rather than delayed.

Cash timing matters as much as revenue. Invoices raised before 24 December may be processed more slowly if the customer’s finance team is closed. Payment runs, approval chains and debt-chasing calls all lose working days. Opening for three days can accelerate cash, but only if invoices are issued, approvals are secured and someone is authorised to chase. Closing without a clear re-entry plan can push collection into the second week of January.

The cold-start problem

Reopening after a break carries a cost that rarely appears in the rota. Email backlogs, order processing, supplier confirmations, IT checks, security checks and staff absence can consume the first day back. A reduced service keeps systems warm and makes the January restart less abrupt. A full closure should therefore include a planned re-entry day, with named responsibility for the inbox, the phones and the payment run.

A simple ledger for the decision

The decision can be reduced to a single comparison. Estimate the incremental gross profit from opening, subtract the avoidable opening costs, then subtract the expected cost of late cash and the restart burden. If the result is positive and the service risk is manageable, trade. If it is negative, close. If it is marginal, reduced service may be the sensible middle path.

For example, an SME expects £7,500 of incremental gross profit from three trading days. Staff premiums and agency cover cost £3,000, additional heat and lighting £300, communications and courier costs £200, and the restart burden £700. Expected late-cash cost is £400. The net benefit is £2,900. On those numbers, opening is defensible. If the gross profit estimate were £4,000, the net benefit would be only £400 — positive, but thin enough to justify a reduced-service model instead.

Decision matrix

Before the rota is signed off

Owners should confirm holiday balances and bank holiday obligations, check supplier cut-off dates and delivery slots, list the customers that need direct cover, and schedule invoice approvals and payment runs before the break. Premises checks should cover alarms, heating, security and insurance conditions. Customer communications should state opening hours, response times and escalation contacts. The team should know who is on call and who is not.

The worst outcome is not choosing to close or choosing to open. It is drifting into a decision that ties up cash, frustrates customers and leaves staff unsure of what is expected. By late November, the Christmas gap should be a costed choice with a named owner — not a week that happens to the business.