U.S. bank reserve balances fell $88.234 billion to $2.882 trillion in the week-ending Wednesday snapshot as the Treasury General Account rose $36.729 billion to $984.046 billion, according to the Federal Reserve’s latest H.4.1 balance-sheet release.
The simultaneous moves matter because money entering the Treasury’s account at the Federal Reserve can remove reserves from the banking system. But the latest numbers do not show that the $36.7 billion TGA increase caused the entire $88.2 billion reserve decline.
A reconstruction of the Fed’s consolidated balance sheet shows why. The TGA increase accounted for less than half of the reserve reduction by itself. Reverse repurchase agreements rose another $41.158 billion, while total Federal Reserve assets declined $4.673 billion. Several smaller liability movements accounted for the remainder.
That distinction is especially relevant now because the New York Fed said only last week that reserves remained in the ample range, while Treasury expects its cash balance could rise further in October.
The $88.2 billion reserve decline was much larger than the TGA increase
The Federal Reserve reported that deposits held by depository institutions fell from $2.970 trillion on September 23 to $2.882 trillion on September 30. That is a $88.234 billion decline, or about 3.0%, calculated by Investozora from the two Wednesday levels reported in the Fed’s H.4.1 statement.
Over the same period, the Fed’s consolidated balance-sheet figures show the Treasury General Account increasing from $947.317 billion to $984.046 billion. That was a $36.729 billion increase, or approximately 3.9%, based on an Investozora calculation: ($984.046 billion − $947.317 billion) ÷ $947.317 billion × 100 = 3.88%.
The TGA is effectively the federal government’s checking account at the Federal Reserve. When Treasury receives funds that previously sat in private bank accounts, the banking system can lose reserves as the Treasury’s Fed balance increases. When Treasury spends from the TGA, the reverse can occur.
This relationship is one reason Investozora’s broader explanation of the Federal Reserve balance sheet treats reserves and Treasury deposits as interconnected Fed liabilities rather than independent pools of money. But the latest H.4.1 data make clear that the TGA was only one part of this week’s change.
TGA and reverse repos together absorbed $77.9 billion
The other large movement was in reverse repurchase agreements. The Fed reported reverse repos at $361.883 billion on September 30, up $41.158 billion from $320.725 billion one week earlier. That represents a roughly 12.8% increase, according to an Investozora calculation using the two H.4.1 levels.
Taken together: TGA increase: +$36.729 billion, Reverse repos: +$41.158 billion, Combined increase: +$77.887 billion. That combined $77.887 billion represents about 88.3% of the $88.234 billion decline in depository-institution balances, an Investozora calculation.
That does not mean those two changes alone “caused” 88.3% of the reserve decline. The Federal Reserve balance sheet has to balance in its entirety, and assets as well as other liabilities moved during the week. The more complete accounting is more informative.
Fed assets declined $4.673 billion between September 23 and September 30. On the liability side excluding bank reserves, reverse repos increased $41.158 billion, the TGA increased $36.729 billion, other deposits increased $3.001 billion, Federal Reserve notes increased $372 million and other liabilities and accrued dividends increased $2.316 billion, while deferred availability cash items decreased $16 million.
Those non-reserve liability movements net to approximately +$83.560 billion. Combine that with the $4.673 billion decline in Fed assets, and the balance-sheet arithmetic almost exactly reconciles the $88.234 billion decline in bank balances, subject to the Fed’s rounding conventions.
That is the central analytical point: the reserve decline was not a one-variable TGA event. It reflected a broader redistribution across the Federal Reserve’s balance sheet.
Where the $88.2 Billion Reserve Decline Came From
Federal Reserve balance-sheet movements from September 23 to September 30, 2026. Values are Wednesday levels unless otherwise noted.
One week, two different measurements
Wednesday snapshots show a sharp reserve decline, while full-week averages moved in the opposite direction.
The $88.234 billion figure is a Wednesday-to-Wednesday change, not a decline in the weekly average level of reserves.
The weekly averages tell a different story
There is another important distinction in the October 1 H.4.1 release. The $88.234 billion reserve decline and $36.729 billion TGA increase are Wednesday-to-Wednesday point-in-time comparisons from the Fed’s consolidated statement of condition. The weekly averages did not move the same way.
In Table 1, the Federal Reserve reported average reserve balances of $2.948 trillion for the week ended September 30, an increase of $17.897 billion from the previous week’s average. Average TGA balances were $948.674 billion, down $28.410 billion from the previous weekly average.
That means it would be incorrect to say simply that “reserves fell $88.2 billion during the week” without identifying the measurement being used. The better description is that Wednesday reserve balances fell $88.2 billion from the previous Wednesday, while average reserve balances over the full week actually increased.
The divergence indicates that the September 30 snapshot captured substantial late-period balance-sheet movement rather than a uniform reserve drain throughout the entire week.
That measurement distinction matters particularly around quarter-end, tax dates and large Treasury settlements, when short-term flows can create large differences between a single-day observation and the weekly average.
$2.88 trillion does not by itself mean reserves have become scarce
A decline of nearly $90 billion is large enough to monitor, but the absolute reserve level alone cannot establish that the banking system is short of liquidity. The New York Fed has repeatedly emphasized that “ample” reserves are not defined by a single dollar threshold. Instead, officials look at how money-market rates respond as reserve supply changes.
In a September 22 speech on supplying ample reserves, New York Fed official Roberto Perli said money-market indicators continued to suggest that reserves were ample and likely to remain so in the near term. He noted that overnight rates were generally trading slightly below the interest rate on reserve balances, consistent with reserves being toward the higher part of the ample range.
That assessment came before the latest $88.2 billion Wednesday-to-Wednesday decline, so it should not be treated as an official Fed assessment of the September 30 reserve level. But it provides the relevant framework for interpreting the new number.
The Federal Reserve’s July Monetary Policy Report similarly said money-market conditions indicated that reserve balances remained within the range consistent with ample reserves. The Fed currently pays 3.90% interest on reserve balances, following its September policy decision. The official amendment establishing that rate took effect September 17. What matters next is therefore not simply whether reserves move below an arbitrary numerical threshold.
The more revealing evidence will come from the effective federal funds rate, repo rates, use of the standing repo facility and other indicators of whether banks are becoming materially more sensitive to changes in reserve supply. That mechanism is also why the distinction between reserve quantities and policy rates matters in understanding how the Federal Reserve controls interest rates.
Treasury expects the TGA could rise further in October
The timing makes the latest balance-sheet movement more consequential. In its August quarterly refunding announcement, the Treasury said it was assuming an end-September cash balance of $950 billion. The actual September 30 H.4.1 level was $984.046 billion, about $34.0 billion above that assumption, according to an Investozora calculation.
More importantly, Treasury said in its latest quarterly refunding statement that the TGA could peak at approximately $1.05 trillion, plus or minus $50 billion, in late October, reflecting expected fiscal outflows and its cash-management policy. The $1.05 trillion figure is a Treasury projection, not an established future balance.
If the TGA rises from the September 30 H.4.1 level of $984.046 billion to exactly $1.05 trillion, the increase would be roughly $66 billion, an Investozora calculation. That should not be translated mechanically into a $66 billion reserve decline because other Fed assets and liabilities will also move.
The New York Fed has already identified October Treasury issuance as something it is watching. Perli said in September that the Desk would monitor how markets respond if another substantial round of net bill issuance occurs during October. That makes the next several H.4.1 releases more informative than the September 30 observation in isolation.
The next signal is in money markets, not just the reserve total
The latest data establish three things. First, Wednesday bank balances at the Fed fell by $88.234 billion to $2.882 trillion. Second, the TGA rose $36.729 billion, but that increase alone cannot explain the reserve decline. Reverse repos increased $41.158 billion and other balance-sheet components also moved.
Third, the weekly averages show a less dramatic liquidity picture: average reserves actually increased $17.897 billion while the average TGA declined. That combination argues against treating a single $88.2 billion point-in-time move as evidence by itself that reserve scarcity has arrived.
The next test is whether lower reserve levels persist as Treasury moves through its projected October cash path and whether the effective federal funds rate, repo rates and standing repo activity begin showing greater sensitivity to those changes. The Federal Reserve’s next H.4.1 release will provide the next balance-sheet snapshot.
