Business and Basis of Preparation	12 Months Ended
Jun. 30, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business and Basis of Preparation	Note 1 – Business and Basis of Preparation General Tamboran is an early-stage growth-oriented natural gas company with a vision of supporting the net zero CO2 energy transition in Australia and Asia-Pacific through developing low CO2 unconventional gas resources in the Northern Territory (“NT”) of Australia. The Group is in the exploration and appraisal stage with a current focus on exploiting its primary assets, which are rights to working interests (“Tenements”) in exploration acreage in the Beetaloo sub-basin (“Beetaloo” or “Beetaloo Basin”), NT Australia. To date, the Group has not determined whether the Tenements contain any natural gas reserves that are economically recoverable. Further, the Group had no revenues from its gas operations as of June 30, 2026. On May 28, 2026, the Group acquired from Falcon Oil & Gas Ltd. (“Falcon Canada”) approximately 98.1% of the issued and outstanding equity interests of Falcon Oil & Gas Australia Limited (“Falcon Australia”) and all of the issued and outstanding equity interests of (i) TXM Oil and Gas Exploration Kft. (“Falcon Hungary”), (ii) Falcon Oil & Gas Ireland Limited (“Falcon Ireland”) (iii) Falcon Oil & Gas Holdings Ireland Limited (“Falcon Holdings”) and (iv) Falcon Exploration and Production South Africa (Pty) Ltd (“Falcon South Africa”). Refer to Note 3 for additional discussion. Tamboran operates in one reportable segment as a single business unit. Refer to Note 14 for additional discussion. Going Concern and Management’s Liquidity Plans The accompanying consolidated financial statements have been prepared on the basis that the Group will continue as a going concern which contemplates the realization of assets and the satisfaction of liabilities in the ordinary and usual course of business. As of June 30, 2026, the Group had: •not generated revenues since inception, and will not generate earnings in the next twelve months sufficient to satisfy all liabilities in the ordinary and usual course of business; •a working capital surplus of $138.2 million arising from an increase in cash and cash equivalents due to the capital and other fundraising activities during the period; •net long-term debt drawn down of $59.0 million related to the construction of the Sturt Plateau Compression Facility (“SPCF”) plus associated financing costs; •an accumulated deficit of $193.4 million since inception; and •significant expenditures planned for natural gas properties in the next twelve months. While several of these conditions raise substantial doubt regarding the Group’s ability to continue as a going concern for the twelve months following the date these consolidated financial statements were available for issuance, the Group has achieved several milestones during the period, which indicate positive progress toward addressing this substantial doubt in future periods. These milestones include the completion of the institutional offering of $180.4 million and the completion of the retail offering of $17.4 million in the last quarter of the fiscal year, which have significantly strengthened the Group’s liquidity position and alleviated the need, in the near term, to pursue certain previously contemplated plans, such as a farm‑down transaction. Construction on the SPCF facility has been completed and the commissioning phase is well underway. The Group’s ability to continue as a going concern remains dependent on the successful execution of its operational plans, including stimulation of the remaining three wells, tie‑in of the wells to the SPCF, and completion of commissioning of the SPCF. Based on progress achieved to date and the Group’s current execution plan, management expects to be better positioned to evaluate the alleviation of substantial doubt in connection with future reporting periods, subject to continued successful execution of these operational plans and funding of future commitments. Although the Group’s cash flow forecast indicates that it will maintain a positive cash position throughout the twelve months following the date these consolidated financial statements were available for issuance, the Group has minimum work commitments under its exploration permits, including commitment wells required to be drilled and stimulated within specified permit years, that fall due shortly after the end of that twelve-month period. Funding for those commitments is expected to require additional equity or debt funding, farm-down or asset sale proceeds, or a variation or extension of the relevant permit work programs. If the Group is unable to secure such funding or obtain a variation, it may be unable to satisfy those commitments and could lose its rights in the affected permits. As of the date of this report, there can be no assurance that the Group will be successful in executing these plans; however, management is actively progressing these programs in accordance with its development strategy. Accordingly, these consolidated financial statements do not include any adjustments related to the recoverability and classification of recorded assets and liabilities that might be necessary should the Group be unable to continue as a going concern.

Tamboran is an early-stage growth-oriented natural gas company with a vision of supporting the net zero CO2 energy transition in Australia and Asia-Pacific through developing low CO2 unconventional gas resources in the Northern Territory (“NT”) of Australia. The Group is in the exploration and appraisal stage with a current focus on exploiting its primary assets, which are rights to working interests (“Tenements”) in exploration acreage in the Beetaloo sub-basin (“Beetaloo” or “Beetaloo Basin”), NT Australia. To date, the Group has not determined whether the Tenements contain any natural gas reserves that are economically recoverable. Further, the Group had no revenues from its gas operations as of June 30, 2026.

On May 28, 2026, the Group acquired from Falcon Oil & Gas Ltd. (“Falcon Canada”) approximately 98.1% of the issued and outstanding equity interests of Falcon Oil & Gas Australia Limited (“Falcon Australia”) and all of the issued and outstanding equity interests of (i) TXM Oil and Gas Exploration Kft. (“Falcon Hungary”), (ii) Falcon Oil & Gas Ireland Limited (“Falcon Ireland”) (iii) Falcon Oil & Gas Holdings Ireland Limited (“Falcon Holdings”) and (iv) Falcon Exploration and Production South Africa (Pty) Ltd (“Falcon South Africa”). Refer to Note 3 for additional discussion.

The accompanying consolidated financial statements have been prepared on the basis that the Group will continue as a going concern which contemplates the realization of assets and the satisfaction of liabilities in the ordinary and usual course of business.

•not generated revenues since inception, and will not generate earnings in the next twelve months sufficient to satisfy all liabilities in the ordinary and usual course of business;

While several of these conditions raise substantial doubt regarding the Group’s ability to continue as a going concern for the twelve months following the date these consolidated financial statements were available for issuance, the Group has achieved several milestones during the period, which indicate positive progress toward addressing this substantial doubt in future periods. These milestones include the completion of the institutional offering of $180.4 million and the completion of the retail offering of $17.4 million in the last quarter of the fiscal year, which have significantly strengthened the Group’s liquidity position and alleviated the need, in the near term, to pursue certain previously contemplated plans, such as a farm‑down transaction. Construction on the SPCF facility has been completed and the commissioning phase is well underway.

The Group’s ability to continue as a going concern remains dependent on the successful execution of its operational plans, including stimulation of the remaining three wells, tie‑in of the wells to the SPCF, and completion of commissioning of the SPCF. Based on progress achieved to date and the Group’s current execution plan, management expects to be better positioned to evaluate the alleviation of substantial doubt in connection with future reporting periods, subject to continued successful execution of these operational plans and funding of future commitments.

Although the Group’s cash flow forecast indicates that it will maintain a positive cash position throughout the twelve months following the date these consolidated financial statements were available for issuance, the Group has minimum

work commitments under its exploration permits, including commitment wells required to be drilled and stimulated within specified permit years, that fall due shortly after the end of that twelve-month period. Funding for those commitments is expected to require additional equity or debt funding, farm-down or asset sale proceeds, or a variation or extension of the relevant permit work programs. If the Group is unable to secure such funding or obtain a variation, it may be unable to satisfy those commitments and could lose its rights in the affected permits.

As of the date of this report, there can be no assurance that the Group will be successful in executing these plans; however, management is actively progressing these programs in accordance with its development strategy.

Accordingly, these consolidated financial statements do not include any adjustments related to the recoverability and classification of recorded assets and liabilities that might be necessary should the Group be unable to continue as a going concern.