E-commerce in the UK is one of the fastest-growing globally, with aggregate online spending forecast to grow at 9.72% CAGR, reaching USD 504.61 billion in 2031. As businesses grow, operational complexity increases. Basic platforms, manual processes, and simple workflows are no longer enough. One of the biggest challenges is that e-commerce businesses will be spending on inventory, logistics, and marketing without realizing revenue at the same rate. Most often, especially in B2B e-commerce, revenue is not realized for months, whereas suppliers demand payment upfront or on short terms. Reducing Days Sales Outstanding (DSO), which is the average number of days it takes for a business to get paid for services or products delivered, will help businesses improve cash flow and working capital, and support sustainable growth.
Order-to-Cash (O2C) is the end-to-end business process that includes all activities – from recording a customer order to fulfilling it, and getting paid. DSO (Days Sales Outstanding) is a key financial metric that measures how efficiently the O2C cycle operates and how quickly payments are collected. Many finance leaders outsource O2C because of the complexity of the tasks involved in the core stages, especially in Accounts Receivable (AR). Every step in AR, from how quickly and accurately invoices are issued to billing, follow-ups, dispute resolution, and collections, can affect DSO. Any error can delay revenue realization.
In this blog, we explore how UK e-commerce players can reduce DSO and optimize cash flow with order-to-cash outsourcing.
The strategic importance of DSO to UK e-commerce
DSO is strategically important to all businesses. Globally, businesses are building larger inventories to tackle geopolitical uncertainties and increase resilience, but this also slows cash realization and extends the Cash Conversion Cycle (CCC). According to Allianz Trade, global CCC rose by a moderate half a day in 2025, reaching 67 days of turnover – 3 days above the 10-year average and close to the 2023 high of 68 days. This trend shows no sign of easing. E-commerce businesses also owe their rapid growth to B2B sales, as more and more companies drive the digitization of supply chains and adopt self-service procurement platforms. In the UK, B2B e-commerce now accounts for roughly half of the nation’s total business turnover, significantly outpacing B2C online retail velocity.
As businesses expand across marketplaces, wholesale channels, B2B customers, and international markets, the gap between making a sale and collecting cash can significantly impact working capital availability.
Why optimized DSO matters strategically:
- Improves working capital availability by converting receivables into cash faster.
- Reduces reliance on external financing such as overdrafts, loans, or revolving credit facilities.
- Supports inventory investment by ensuring cash is available to replenish stock and meet customer demand.
- Strengthens cash flow forecasting by providing greater visibility and predictability in collections.
- Enables faster business expansion into new products, channels, or markets.
- Improves investor and lender confidence by demonstrating strong financial discipline and collections performance.
- Reduces bad debt risk through proactive receivables management and faster dispute resolution.
- Enhances overall financial resilience during periods of rapid growth or market uncertainty.
Cash flow challenges in e-commerce
E-commerce businesses face unique cash flow challenges that differ significantly from those of traditional retail. This has a great deal to do with timing, as e-commerce companies pay upfront for inventory, shipping, inbound returns, processing and refunds, and marketing. At the same time, revenue is realized at a much later date.
E-commerce cash flow challenges:
- Delayed payouts from marketplaces like Amazon and payment processors like Stripe/PayPal that often hold funds for 7-14 days.
- Inventory bloat from slow-moving stock that traps working capital.
- Returns and refunds in the UK average 20-30%, meaning you ship and pay for items that come back.
- Ad spend and VAT timings are another challenge. Paying for Facebook and Google Ads happens days or weeks before you realize revenue. Furthermore, UK VAT quarterly payments can create massive, sudden tax liabilities for growing brands.
While order-to-cash outsourcing cannot eliminate marketplace settlement delays, inventory challenges, returns, or VAT obligations, it helps businesses improve cash forecasting, accelerate collections, and gain the working capital visibility needed to manage these pressures more effectively. For many growing e-commerce companies, stronger O2C performance is a critical lever to improve liquidity and reduce cash flow volatility.
Why e-commerce businesses should consider order-to-cash outsourcing
As e-commerce businesses grow, managing the Order-to-Cash (O2C) cycle becomes increasingly complex. Multiple sales channels, growing customer bases, higher transaction volumes, and increasing pressure on cash flow can quickly overwhelm internal finance teams. Order-to-cash outsourcing allows businesses to streamline receivables operations, improve collections performance, and maintain financial control without continuously expanding internal headcount.
Key reasons UK e-commerce companies are outsourcing O2C:
- Reduce DSO and accelerate cash flow through structured collections and proactive follow-ups.
- Improve working capital management by converting receivables into cash more efficiently.
- Handle growing transaction volumes without increasing finance team costs.
- Strengthen invoicing accuracy and reduce billing-related disputes.
- Enhance cash application and reconciliation for better visibility into outstanding receivables.
- Gain access to automation and AI tools without significant technology investment.
- Improve customer communication through dedicated collections and dispute management processes.
- Free internal finance teams to focus on analysis, growth initiatives, and strategic planning.
- Build scalable finance operations that can support expansion into new channels, geographies, and customer segments.
For fast-growing e-commerce businesses, order-to-cash outsourcing creates a more disciplined, data-driven revenue cycle that improves cash flow, supports growth, and gives finance leaders greater control over working capital.
Conclusion
For UK e-commerce businesses, growth alone does not guarantee strong cash flow. As sales channels expand, transaction volumes rise, and working capital pressures increase, reducing DSO becomes critical to maintaining financial flexibility and supporting sustainable growth. Outsourced Order-to-Cash solutions help businesses accelerate collections, improve cash visibility, strengthen working capital management, and build scalable finance operations. By transforming O2C from a transactional process into a strategic capability, e-commerce companies can unlock cash faster, improve liquidity, and create a stronger foundation for long-term growth.
