IC++ vs Blended Rates: Why Pricing Transparency Is Back in Focus for UK Merchants

Card processing costs are once again under scrutiny as UK merchants seek greater transparency and control over one of their most material operational expenses.

With ongoing adjustments to interchange and scheme fees from Visa and Mastercard, attention is turning to how acquirers structure pricing, specifically the difference between IC++ and blended rate models.

For many businesses, the distinction is not simply technical. It is commercial.

What Is IC++?

IC++ (Interchange Plus Plus) separates card processing fees into three visible components:

•Interchange paid to the card issuer

•Scheme fees paid to the card network

•The acquirer's margin

Under this structure, merchants see the true underlying cost of each transaction category. If interchange or scheme fees change, the impact is visible. The acquirer's markup is agreed and transparent.

For higher turnover merchants or those with diverse card profiles, IC++ can provide greater pricing fairness and benchmarking clarity.

What Is a Blended Rate?

A blended rate simplifies pricing into a single percentage applied to most or all transactions.

For example:

•1.29% across consumer cards

•1.85% across commercial cards

The simplicity appeals to many SMEs. However, because lower cost debit transactions are averaged together with higher cost premium or corporate cards, some merchants may unknowingly subsidise more expensive card types.

Blended models can be commercially competitive, but they provide less visibility into how margin is structured.

Why It Matters Now

With margin pressure across retail, automotive, hospitality and charity sectors, even small differences in effective rates can materially impact profitability.

A 0.20% variance on £5m of annual card turnover represents £10,000 in cost movement. At higher volumes, the financial impact becomes increasingly significant.

In addition, changes in customer behaviour, such as increased use of commercial cards or cross border transactions, can alter the economics of both pricing models.

Understanding Your Effective Blended Rate

Many businesses operate on blended pricing without understanding their effective blended rate, the actual average percentage they pay across all transactions.

This figure can drift over time as:

•Customer payment preferences change

•Card mix shifts toward premium or commercial cards

•Cross border transactions increase

•Scheme fees are adjusted by Visa and Mastercard

Without regular review, merchants may be paying more than necessary or subsidising transaction types that could be priced more competitively under IC++.

When IC++ Makes Commercial Sense

IC++ pricing is particularly suited to:

•Businesses processing over £500,000 annually in card payments

•Merchants with high volumes of debit card transactions

•Organisations with predictable card mix and transaction patterns

•Businesses seeking to benchmark acquirer margin independently

•Merchants expanding internationally or accepting cross border cards

The transparency of IC++ allows finance teams to model cost changes, negotiate acquirer margin and understand the true impact of scheme fee adjustments.

When Blended Rates May Be Appropriate

Blended pricing can work well for:

•Smaller businesses with lower transaction volumes

•Merchants preferring pricing simplicity and predictability

•Businesses with limited finance resource to monitor interchange changes

•Organisations where card processing is a small proportion of total costs

However, even on blended pricing, merchants should understand their effective rate and review it annually to ensure competitiveness.

The Role of Acquirer Margin

Regardless of pricing structure, the acquirer's margin is a critical component of total cost.

On IC++, this margin is explicit and negotiable. On blended rates, it is embedded within the headline percentage and less visible.

Merchants reviewing their payment costs should focus on:

•What is the acquirer's margin?

•How does it compare to market benchmarks?

•Has it increased over time without notification?

•Are there opportunities to negotiate better terms?

Independent payment consultants can provide benchmarking data and negotiation support to help businesses secure competitive pricing.

Scheme Fee Changes and Pricing Impact

Visa and Mastercard periodically adjust scheme fees, which affect both IC++ and blended pricing models.

Under IC++, these changes are passed through transparently. Merchants see the adjustment and can assess the impact.

Under blended pricing, scheme fee increases may be absorbed by the acquirer or passed through via blended rate adjustments. Without visibility, merchants may not realise when or why their costs have changed.

The Payment Lynk View

The issue is not IC++ versus blended in isolation. It is whether the pricing structure reflects the merchant's card mix, turnover profile and risk appetite.

Too often, businesses stay on legacy pricing models without reviewing their effective blended rate or understanding how acquirer margin is layered within it. Transparency creates leverage, and leverage creates savings.

At Payment Lynk, we help businesses understand their true payment costs, benchmark acquirer margin and identify whether IC++ or optimised blended pricing delivers better commercial outcomes.

Review Your Payment Pricing Structure

Understanding your effective blended rate is the first step towards optimising payment performance and reducing unnecessary cost.

Whether you operate on IC++ or blended pricing, regular review ensures your payment costs remain competitive and aligned to your business needs.

Request a Payment Review and discover how Payment Lynk can help you achieve greater pricing transparency and cost control.