The monthly broadband bill does not fully capture the expenses tied to delivering internet service. The cost structure splits between the company selling the connection and the operator managing the underlying network. This separation explains why identical service packages can differ in price, and why owning fiber infrastructure does not guarantee profitability.
In Britain, Openreach operates as the physical network provider for communications companies, which then market broadband to households and businesses. As part of BT Group, Openreach offers its services to competitors under equal terms, eliminating the need for each provider to construct separate fiber lines. Yet even with shared network access, providers differ in capacity, routing, equipment, and customer support, leading to variations in cost and experience despite using the same fiber backbone.
Customers see only the brand on their bill, unaware of the broader supply chain. For investors, the focus shifts to efficiently acquiring and retaining subscribers. The gap between price and profit starts with subscription revenue minus wholesale access costs. A provider earning £30 per month before VAT, for instance, may pay £18 for network access, leaving £12. However, this is not net profit. Additional expenses—such as routers, billing systems, support, and customer acquisition—further shrink margins.
The financial reality becomes clearer with a hypothetical scenario. If acquiring a subscriber costs £120 and the provider earns £5 per month after ongoing service costs, the investment takes 24 months to recover. Early customer departures disrupt these calculations, making retention as critical as sign-ups. Discounts and introductory offers function as investments in future revenue rather than straightforward price reductions.
How infrastructure ownership reshapes profits
A low headline price may attract customers, but it reveals little about the long-term viability of the business supplying the connection. This dynamic changes when providers also control network infrastructure. Some, like CityFibre, operate as wholesale-only suppliers, selling access to other internet service providers (ISPs) rather than directly to households. Others combine retail sales with infrastructure ownership, retaining revenue that would otherwise flow to a separate network operator.
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CityFibre’s 2024 financial results highlight the trade-offs involved. The company reported £134 million in revenue and £5 million in adjusted EBITDA, a 3.7% margin, while its network had reached 4.3 million premises but served only 518,000 active customers. The figures show a fundamental challenge: infrastructure demands substantial upfront investment before generating meaningful revenue. A street full of fiber-ready properties does not ensure paying subscribers.
Regulation forces transparency in wholesale markets
Regulatory oversight plays a key role in shaping these economic realities. In New Zealand, the Ultra-Fast Broadband initiative depends on four wholesale providers, Chorus, Enable, Northpower, and Tuatahi, supplying networks to competing retailers. Customers can switch providers without altering the underlying infrastructure, while regulators enforce transparency and quality standards for wholesale services. The model clarifies that choosing a broadband provider often means selecting who packages and bills the service over an existing network.
Tomas Novosad, founder of Fibre Broadband NZ, notes that the New Zealand model makes this distinction clearer. He says, “Choosing a fibre provider often means choosing who packages, supports and bills the service over an existing network. The retailer’s job is to make that relationship commercially viable.” Infrastructure returns are also subject to regulatory scrutiny.
New Zealand’s Commerce Commission applies information disclosure requirements to the four regulated fibre wholesalers, with Chorus additionally subject to price-quality regulation. This allows the regulator to set maximum revenue and minimum quality standards for Chorus’ regulated services.
BT’s Openreach division reported an average revenue per user of £16.70 for the financial year ending March 2026. This figure represents overall earnings across its broadband base, not a uniform wholesale tariff applied to every retailer. Investors assess both the growth rate of subscriber take-up and the proportion of revenue retained after wholesale fees. A retailer securing a high-margin customer base may achieve sustainable returns even when wholesale costs consume a large share of revenue.