Tullow loses its ICC tax arbitration with Ghana over US$196.5m assessment on insurance proceeds

The tribunal held that the assessment on business interruption insurance proceeds did not breach Tullow's Petroleum Agreements. The GRA puts the total, with penalties and interest, at about US$393m.

Jurisdiction GhanaPractice Dispute Resolution and Arbitration, Energy and Natural Resources, TaxSector Oil and Gas

An International Chamber of Commerce tribunal has ruled against Tullow Oil in its tax arbitration with the Government of Ghana. In an update on 30 September 2026, Tullow said the tribunal found that a US$196.5 million corporate income tax assessment on proceeds from its business interruption insurance, covering the 2016 to 2019 financial years, does not violate its Petroleum Agreements. The tribunal also found that 100% penalties fall “outside the scope of the contractual protections” in those agreements.

Tullow said it was disappointed and would consider next steps after further engagement with the Government of Ghana. Its shares fell by around half on the day, according to World Oil.

The amounts

The headline assessment is US$196.5 million. The Ghana Revenue Authority has put the total obligation, including penalties and accrued interest, at about US$393 million. Commissioner-General Anthony Kwasi Sarpong said the GRA would work with Tullow to settle the liability “in a manner that is not disruptive” to its business. Ghana’s finance minister has said the government intends to implement the award in a way that secures the revenue while preserving Tullow’s ability to operate.

The legal point

Tullow’s case rested on its Petroleum Agreements rather than on general tax law: in effect, that the fiscal terms negotiated for its Ghanaian fields protected it from this assessment. The tribunal disagreed on the tax itself and treated penalties as falling outside the contractual protections altogether. Neither the award nor the identity of counsel or arbitrators has been published, so the precise reasoning on how insurance receipts sit within the fiscal regime is not yet known.

Why it matters

For Tullow, Ghana provides most of its production and the cash flow that services its debt, so the size and timing of any payment matter as much as the principle. For the market, the decision is a reminder that fiscal stabilisation and tax provisions in West African petroleum agreements are read narrowly where income falls outside the ordinary production stream. Tullow has a further arbitration pending with Ghana and an outstanding tax assessment in Kenya, according to World Oil.

It also sits alongside another recent ICC outcome favourable to a West African state, the dismissal of Sunrise Power’s Mambilla claim against Nigeria.

What to watch

Whether Tullow seeks to challenge the award at the seat, the terms of any payment arrangement with the GRA, and further disclosure in Tullow’s next trading update. The matter is recorded in The Meridian’s matters file.