Initial margin vs realised margin: what UK fashion Q1 2026 data reveals

What drove the gap between initial and realised margin in Q1 2026?

Marks & Spencer reported fashion store margin of 8.4 per cent and online margin of 6.0 per cent in H1 2026, with the company acknowledging that fashion margins remain below long-term targets, especially online, where logistics and returns costs are high. JD Sports saw gross margin of 47.7 per cent in H1 2026, down 60 basis points on the prior period, principally from an elevated promotional marketplace across geographies and subdued performance in key lifestyle footwear brands. The gap between initial margin, set at the point of buy, and realised margin, after markdowns, shrinkage and mix effects, remained wide across the UK fashion sector in the first quarter of 2026.

Three forces compressed realised margin relative to plan: promotional markdown, inventory shrinkage and channel mix. Each operates differently, but all share a common characteristic: they are largely controllable through better planning and execution.

How much did markdown activity reduce margin in Q1 2026?

Helen Dickinson, Chief Executive of the BRC, said in April 2026 that bigger discounts in clothing, furniture and DIY goods helped pull down shop price inflation, with weakening consumer confidence forcing retailers to compete harder on price to stimulate more spring spending. Aritzia, reporting strong Q1 2026 results, attributed healthy inventory composition to driving a lower markdown rate through disciplined inventory management. Markdown pressure varied by business model, but the pattern was clear: retailers who entered the quarter with excess inventory or weak sell-through forecasts paid for it in margin erosion.

M&S reported full-price sales in fashion, home and beauty at 83 per cent of sales in H1 2026. That implies 17 per cent of sales carried some level of markdown, a figure that translates directly into realised margin compression. The level of markdown required depends on how far initial buys diverge from actual demand.

What is the scale of shrinkage in UK fashion retail?

Across UK retail, stock shrinkage typically runs at 1.4 to 1.7 per cent of turnover, sitting inside the £7.5 billion to £9 billion band across the sector, depending on whose estimate you use. External theft, mainly shoplifting and organised retail crime, accounts for 34.6 per cent of shrinkage at £1,993 million. Staff theft contributes around 22.1 per cent of shrinkage, costing UK retailers an estimated £1,305 million annually. Fashion is particularly vulnerable due to high-value, portable items and high footfall environments.

Shrinkage affects realised margin in two ways: direct stock loss reduces the denominator in margin calculations, and the cost of preventative measures adds to the numerator. Unlike markdown, shrinkage is harder to recover through merchandising adjustments, making it a pure loss against initial margin assumptions.

How did channel mix affect margin realisation in Q1 2026?

M&S reported fashion store margin of 8.4 per cent and online margin of 6.0 per cent in H1 2026. The 240-basis-point gap reflects the structural cost differences between channels: fulfilment, delivery, returns and customer acquisition all weigh more heavily on online operations. Q1 2026 UK online retail share was tracking at 28.0 per cent. As online penetration grows, the blended margin shifts downward unless retailers can compress the per-channel margin gap.

In the week ending 5 April 2026, store fashion sales fell by a relatively modest 1.05 per cent, compared to 6.07 per cent a year earlier, whilst non-store fashion sales plummeted by 21.26 per cent, the sharpest category decline in the tracker, against a positive base of 2.48 per cent last year. Volatility in channel performance makes it harder to plan margin realisation accurately.

What role does forecasting play in narrowing the margin gap?

AI-powered forecasting use cases, as noted in The State of Fashion 2025 by McKinsey and Company, have the potential to reduce inventory by 5 to 15 per cent and to achieve a 15 to 25 per cent improvement on stockouts. Better forecasting reduces the three main drivers of margin erosion: it lowers markdown by aligning buys with demand, it reduces shrinkage exposure by minimising overstock that sits longer, and it improves channel planning by allocating inventory more accurately.

The mechanics are straightforward. Retailers using AI markdown optimisation report 10 to 20 per cent improvements in season-end sell-through rates and 5 to 15 per cent reductions in average markdown depth. Those gains translate directly into realised margin closer to initial assumptions. Forecasting does not eliminate markdown, shrinkage or mix effects, but it makes them more predictable and manageable.

Which levers offer the fastest margin protection in 2026?

Markdown control offers the most immediate impact. Reducing unplanned markdown by 200 basis points on 20 per cent of inventory delivers roughly 40 basis points of margin protection at the total business level. That requires tighter pre-season forecasting, faster in-season reforecasting and earlier intervention when styles underperform.

Shrinkage reduction is slower but compounds over time. Moving from 1.7 per cent to 1.4 per cent shrinkage on a £100 million turnover business saves £300,000 annually, most of which flows to margin. Technology, process and security investment all contribute, but the highest-return interventions focus on high-value, high-theft categories where fashion sits squarely.

Channel mix improvement depends on structural cost reduction in online fulfilment and returns handling. M&S noted that fashion margins remain below long-term targets, especially online, where logistics and returns costs are high. Closing the online margin gap to within 100 basis points of store margin would materially improve blended realised margin as online share continues to grow.

• Implement demand forecasting at SKU and channel level to reduce overbuying and markdown exposure.
• Tighten inventory discipline in high-shrinkage categories through better stock visibility and loss prevention.
• Compress online fulfilment and returns costs to narrow the structural margin gap between channels.
• Reforecast faster in-season to trigger earlier markdown intervention and minimise end-of-season clearance depth.