Reading a Central Bank Balance Sheet: Reserves, TLTROs, Repo and the Plumbing Behind Rates

What you will learn

• The main lines of the Eurosystem and Federal Reserve balance sheets, and where to find them each week.
• The identity that links reserves to everything else, and how to use it.
• What TLTROs, repo and reverse repo do to reserves.
• Why "excess liquidity" and government cash balances matter for money-market rates.

Explanation

Reserves also move for reasons unrelated to policy decisions; reading the balance sheet lets you separate the two.

Where to look

The ECB publishes the consolidated weekly financial statement of the Eurosystem (the ECB plus national central banks such as the Bundesbank) every Tuesday; the Fed publishes the H.4.1 release every Thursday. Both share the same logic.

The structure

Because assets equal liabilities, reserves are the residual:

Reserves = Total assets − Banknotes − Government deposits − Reverse repo − Other liabilities − Capital

Anything that raises an asset (a bond purchase, a loan to a bank) raises reserves. Anything that raises another liability (more banknotes, a higher government balance, more reverse repo) lowers reserves, even if the central bank did nothing.

Key instruments

• TLTRO (targeted longer-term refinancing operation): multi-year ECB loans to banks, cheaper if the bank kept lending to companies and households. The third series peaked above €2 trillion in 2021; after the ECB tightened its terms in late 2022, banks repaid early, and the last operation matured in December 2024. Each repayment reduced both "lending to banks" and reserves.
• Repo (repurchase agreement): the central bank buys a security and agrees to sell it back later; economically a collateralised loan to the bank. Repo adds reserves temporarily; the Fed's Standing Repo Facility and the ECB's MRO are repo-type operations.
• Reverse repo: the central bank sells a security and agrees to buy it back; it borrows cash and drains reserves. The Fed's ON RRP facility, used mainly by money-market funds, held well over $2 trillion in 2022–2023 and fell to near zero by late 2025 as QT progressed.
• Treasury General Account (TGA): the US government's account at the Fed. Tax payments in April move hundreds of billions from bank deposits into the TGA, draining reserves; spending pushes the other way. Government deposits at euro-area national central banks play the same role.

Excess liquidity

In the euro area, excess liquidity = reserves held − minimum reserve requirements. The higher it is, the more firmly €STR is glued to the DFR; as it declines, money-market rates can drift up towards the MRO. In the US the question is whether reserves are still "ample": in September 2019 repo rates jumped far above the policy range for several days after tax payments and Treasury settlements drained reserves at once, showing how quickly ample becomes scarce.

Worked example

Hypothetical example: a simplified balance sheet in € billion; all figures invented.

1. Reserves = 6,100 − 1,600 − 300 − 700 − 200 = €3,300 billion.
2. Minimum reserves are €170 billion, so excess liquidity = 3,300 − 170 = €3,130 billion.
3. Tax day: government deposits rise by €100 billion. Assets are unchanged, so reserves fall to €3,200 billion.
4. Banks repay €200 billion of TLTROs. Lending falls to €200 billion, total assets to €5,900 billion, reserves to €3,000 billion; excess liquidity is now €2,830 billion.
5. Over a year, banknotes grow by €50 billion. Reserves fall by another €50 billion to €2,950 billion.

Within a year the system lost €350 billion of reserves without a single bond sale. Exclusions: revaluations, interest flows and intra-Eurosystem (TARGET) balances.

Common mistake

Practice activity

On paper, in € billion (hypothetical): assets: gold and FX 800, lending to banks 250, securities 3,900, other 250. Liabilities other than reserves: banknotes 1,550, government deposits 250, other 600, capital 150. Minimum reserves: 160. (a) Calculate reserves and excess liquidity. (b) The central bank runs €50 billion of reverse repo with money-market funds. Recalculate both. (c) Does the reverse repo change total assets?

Key takeaways

• Reserves are the residual of the balance sheet: assets minus banknotes, government deposits, reverse repo, other liabilities and capital.
• Loan repayments, tax payments and banknote growth drain reserves without any bond sale; repo adds reserves, reverse repo drains them.
• Excess liquidity (euro area) and "ampleness" (US) decide how tightly overnight rates stick to the floor.
• Read the asset side before calling any weekly change a policy signal.

Next step

Next we turn to words: forward guidance, press conferences, minutes and how to redline a statement against the previous one.