Following its first rate increase since July 2023, the Federal Reserve moved its benchmark rate up by 0.25 percentage points to a range of 3.75%-4.00% on September 16. Berkshire Hathaway maintains a massive reserve of $359.2 billion in cash and Treasury bills, which is set to generate higher returns as short-term yields climb.
Yet, this financial advantage has not yet appeared on Berkshire’s financial statements. For the first half of 2026, the company reported investment income from interest, dividends, and other sources that dipped slightly compared to the prior year, despite the expansion of its cash reserves.
Why The Payoff Hasn’t Landed Yet
As detailed in its June 30 regulatory filing, Berkshire has continuously grown its cash and Treasury bill holdings from about $146 billion in 2023—a swift accumulation of capital that has caught the attention of investors.
As interest rates rise, the yield on this reserve only increases gradually as older Treasury bills reach maturity and are replaced with new ones at higher rates, a transition that takes place over the course of several months.
This delay accounts for why Berkshire’s financial report for the first half of 2026, released on August 8, reflected minimal impact from the higher interest rate environment. Despite a growing cash balance, the company experienced a minor year-over-year decrease in investment income from interest, dividends, and other streams.
Although net earnings more than doubled to $35.8 billion during this six-month period, this increase was primarily driven by unrealized gains on equities rather than cash-generated returns. During the quarter, Berkshire continued to allocate capital—increasing its investment in Google parent Alphabet and completing other acquisitions—actions separate from the Federal Reserve’s monetary policy decisions.
The Federal Open Market Committee, responsible for setting U.S. monetary policy, has indicated that another rate hike is anticipated before the conclusion of the year, with futures markets currently estimating an 87% probability of such a move.
Should another rate hike occur, newly maturing Treasury bills will be reinvested at elevated yields, incrementally boosting Berkshire’s interest revenue. Until that time, the true benefit of the massive cash reserve functions more as a strategic reservoir of flexibility than guaranteed income already realized, relying equally on CEO Greg Abel’s future capital allocation decisions and the future path of interest rates.