Quantitative tightening: Definition & Examples

Quantitative tightening (QT) is the deliberate reduction of a central bank's securities holdings as it unwinds earlier quantitative easing. It changes the amount and composition of assets held by the private sector and can affect bond pricing and funding conditions. For a quant, the key is to separate the securities portfolio, the central bank's liabilities and the expected policy-rate path.

Runoff and sales are different operations

Method	What happens	What determines its pace?
Runoff	Principal is repaid at maturity or through amortisation, and some or all is not reinvested.	The portfolio's repayment schedule and reinvestment rules; a cap limits runoff rather than guaranteeing that amount.
Outright sales	The central bank sells existing securities before they mature.	Sale schedules, investor demand and market prices.

Both reduce securities holdings, but runoff does not require an outright sale. A sale can crystallise a gain or loss relative to carrying value. A falling market valuation alone is not QT. The Bank of England's operations guide describes both ways of unwinding purchases.

Follow the payment, not just the asset

Consider a fictional, simplified US-style central bank, separate from the Treasury. All amounts below are billions of currency units. It holds a Treasury security with principal and carrying value of 10 that matures today. The Treasury repays it from its existing deposit at the central bank. Compare immediately before and after this redemption only: no new debt issue, taxes, spending, interest, reinvestment or other transactions occur during the interval. Other balance-sheet items are omitted and unchanged.

Central-bank balance-sheet item	Before	After	Change
Securities assets	100	90	−10
Bank reserve liabilities	80	80	0
Treasury deposit liability	20	10	−10
Total shown liabilities	100	90	−10

The central bank extinguishes its claim on the Treasury and reduces what it owes the Treasury. Bank reserves do not change in this immediate step. The Treasury's matching entries are a smaller deposit asset and a smaller debt liability. This is the redemption-without-new-issuance case in the New York Fed's runoff explanation.

Fictional immediate redemption of 10 billion: securities assets fall from 100 to 90, Treasury deposits fall from 20 to 10, and bank reserve liabilities stay at 80.

The time boundary matters: this figure isolates redemption from an already funded Treasury account, not the transactions that filled that account.

Over a wider interval, the funding path matters. If a commercial bank first buys a new Treasury security for 10 using reserves, reserves fall by 10 and the Treasury deposit rises by 10. Subsequent redemption of the central bank's maturing security then reduces that deposit by 10. Across both transactions, reserves fall by 10 and the Treasury deposit returns to its initial level. If eligible money-market funds instead finance new issuance by reducing overnight reverse-repo investments at the central bank, that liability can decline instead. These alternatives are why securities runoff and reserve changes need not match over a particular reporting window.

For an outright sale to a commercial bank, payment normally reduces that bank's reserves while adding the security to its assets. With a nonbank buyer paying from a bank deposit, the settling bank also debits the buyer's deposit. Specify the buyer, settlement route and any offsetting central-bank operations before claiming a money-supply effect.

What markets can infer

QT can leave more duration risk with private investors than continued reinvestment would, potentially increasing the compensation investors require for holding longer bonds. The effect depends on maturities, the anticipated path of holdings, market conditions and concurrent fiscal issuance. The Bank of England's September 2026 discussion stresses uncertainty in estimates of QT's yield effects. There is no fixed conversion from a currency amount of runoff to a basis-point rate increase.

A central bank can change its policy rate while following a separately announced balance-sheet path. Reserve scarcity also depends on banks' demand for settlement balances and other central-bank liabilities. In an ample-reserves system, small reserve changes can have little effect on overnight rates; the St Louis Fed's balance-sheet explainer distinguishes reserve management from the policy-rate decision.

For research, record announcement time separately from settlement and balance-sheet publication. A known maturity is not automatically a surprise policy shock. Track securities holdings alongside reserves, Treasury cash, reverse repos and other operations; an aggregate balance-sheet decline alone does not identify the channel driving asset returns.

Sources

Bank of England, Market Operations Guide: Our objectives: unwinding QE, Bank Rate and reserve supply.
New York Fed, The Fed's Balance Sheet Runoff and the ON RRP Facility: Treasury repayment, bank purchases and alternative liability adjustments.
Dave Ramsden, Quantitative tightening: the next chapter, 28 September 2026: duration supply and uncertainty about market effects.
St Louis Fed, The Fed's Balance Sheet and Ample Reserves, 18 February 2026: liabilities and rate implementation.

Runoff and sales are different operations

Follow the payment, not just the asset

What markets can infer

Sources

Related terms

Central bank

Policy rate

Quantitative easing