Background
The South Carolina Department of Revenue assessed Mastercard International for corporate income tax, license fees, penalties, and interest for tax years 2007 through 2016. Mastercard operates a global payment network connecting issuers, acquirers, merchants, and cardholders. Although its switching and much of its technical processing occurred outside South Carolina, its fees depended largely on transaction count and dollar volume. The Department attributed a portion of Mastercard’s receipts to this state based on Mastercard-branded transactions at South Carolina merchants.
The Administrative Law Court upheld the assessment. Mastercard argued that section 12-6-2295(A)(5), governing receipts from services, looks to where income-producing activity is performed. It characterized its final income-producing act as delivery of processed messages to paying customers outside South Carolina. The Department viewed the relevant service more broadly as provision of an integrated payment network that authorized and completed transactions in the state. Mastercard also challenged the Department’s expert and penalties imposed for failing to file returns during the audit years.
The dispute followed the court’s DIRECTV framework, under which receipts from a multistate service are attributed to South Carolina to the extent the income-producing activity occurs here. The central question was therefore how to define Mastercard’s service before locating it. A narrow definition pointed to out-of-state computer functions; the Department’s definition captured the network’s commercial operation at the point of card use.
The Court’s Holding
The Court of Appeals affirmed. Applying its earlier DIRECTV decision, the court treated identification of the taxpayer’s income-producing activity as a fact-intensive determination reviewed for substantial evidence. The statute does not require the decisive activity to be the last electronic or technical step performed for the taxpayer’s direct customer. Substantial evidence supported the ALC’s finding that Mastercard sold access to and use of an overall network, not merely out-of-state message delivery. The network produced income when cardholders used Mastercard-branded cards for transactions with South Carolina merchants.
The court also approved transaction location as a reasonable proxy for the in-state share of Mastercard’s activity. Its various fees arose from the same overall network service even though Mastercard divided revenue into multiple streams. The court found no reversible error in admitting the Department expert’s testimony; the witness’s experience supported qualification, and any error was nonprejudicial given the other evidence. Finally, it upheld failure-to-file penalties. Mastercard eventually conceded it had nexus with South Carolina and began filing in 2017. Its dispute about whether it earned apportioned income in the state did not eliminate the filing obligation during the audit period.
Key Takeaways
- For South Carolina service-receipt apportionment, income-producing activity is identified from the economic service as a whole, not automatically from the taxpayer’s last technical act.
- A payment network performs activity in South Carolina when its branded cards facilitate transactions at South Carolina merchants, even if switching infrastructure is elsewhere.
- Transaction counts and volume may reasonably approximate the in-state portion of an integrated network service.
- A taxpayer’s disagreement over apportionment does not necessarily excuse the separate duty to file, and failure-to-file penalties remain subject to the Department’s statutory discretion.
Why It Matters
This published decision is consequential for financial-technology companies and other multistate service providers selling digitally enabled networks into South Carolina. It rejects a narrow server-location or final-message theory when revenue depends on in-state use of a broader platform. Corporate tax teams should analyze what customers economically pay for, where the revenue-generating interaction occurs, and whether transaction data provides a defensible state-level approximation.
The opinion also raises the practical stakes of filing while contesting methodology. A company with South Carolina nexus may reduce penalty exposure by filing on a good-faith position, seeking Department guidance, or using available protest procedures rather than treating an apportionment dispute as permission not to file. Practitioners should read the ruling alongside DIRECTV and the companion U.S. Bank decision issued the same day; together they signal substantial deference to ALC findings that connect in-state customers, merchants, or property to the taxpayer’s revenue-producing service.