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RETIREMENT PLANS
 9 Months Ended
Jun. 30, 2025
Retirement Benefits [Abstract]  
RETIREMENT PLANS RETIREMENT PLANS
 
Barnwell sponsors a noncontributory defined benefit pension plan (“Pension Plan”) covering substantially all of its U.S. employees and a noncontributory Supplemental Executive Retirement Plan (“SERP”), which covers certain current and former employees of Barnwell for amounts exceeding the limits allowed under the Pension Plan. Effective December 31, 2019, the accrual of benefits for all participants in the Pension Plan and SERP was frozen and the plans were closed to new participants from that point forward.

The following tables detail the components of net periodic benefit (income) cost for Barnwell’s retirement plans:
 Pension PlanSERP
 Three months ended June 30,
 2025202420252024
Interest cost$98,000 $103,000 $24,000 $24,000 
Expected return on plan assets(200,000)(192,000)— — 
Amortization of net actuarial gain— — — (21,000)
Net periodic benefit (income) cost$(102,000)$(89,000)$24,000 $3,000 
 Pension PlanSERP
 Nine months ended June 30,
 2025202420252024
Interest cost$293,000 $308,000 $71,000 $72,000 
Expected return on plan assets(600,000)(575,000)— — 
Amortization of net actuarial gain— — — (64,000)
Net periodic benefit (income) cost$(307,000)$(267,000)$71,000 $8,000 

The net periodic benefit (income) cost is included in “General and administrative” expenses in the Company's Condensed Consolidated Statements of Operations.

Currently, no contributions are planned to be made to the Pension Plan during fiscal 2025. The SERP plan is unfunded and Barnwell funds benefits when payments are made. Expected payments under the SERP for fiscal 2025 are expected to be $76,000. Fluctuations in actual equity market returns as well as changes in general interest rates will result in changes in the market value of plan assets and may result in increased or decreased retirement benefits costs and contributions in future periods.

A portion of the Pension Plan’s investments is in publicly traded stocks, one of which is Barnwell’s common stock. At June 30, 2025 and September 30, 2024, the Pension Plan held 520,350 and 413,148 shares, respectively, of Barnwell common stock (see Note 18 for additional details).