After some types of pension funds were at risk of collapse, the Bank of England stepped in.
The pound plummeted after the mini-budget caused turmoil on financial markets.
Some of the value of government bonds was halved due to investors demanding a higher return.
Pension funds were forced to sell bonds, sparking fears of a new market downturn.
The Bank said it was concerned about a material risk to the UK's financial stability when it decided to buy bonds quickly.
The government borrows money to fund its spending plans by selling bonds to investors.
The collapse in the price of those bonds forced some pension funds to sell assets.
There was a risk that the pension funds would not be able to pay their debts if that continued.
The Bank will buy around £65 billion of gilts on Wednesday.
"While this is a complex situation as there has been a lot of volatility in the gilt markets in recent days, we would not expect any significant issues for savers."
The Bank of England is attempting to calm borrowing markets. It is making a difference. Some questions are raised by it.
It is clear that this is a crisis and that the Bank is in emergency mode. The mini-budget led to a loss of market confidence and a rise in borrowing rates.
The Bank says that the crash in the value of loans to the government was a threat to financial stability.
Financial markets are closely monitored by the Pensions Regulator for their impact on the funding of final salary pension schemes.
The Bank of England has announced that it will temporarily purchase long-dated UK government bonds.
The pound fell to a record low on Monday after the chancellor pledged to cut taxes.
The level of government borrowing was shocking to investors.
After the Bank's announcement and the pound's rise, the UK government bond markets and stock markets came back to life.
Despite growing criticism, the government insists it is sticking to its plan.
The tax cuts were the right plans to grow the UK economy, according to the treasury minister.
He said the Bank of England had done their job by buying government debt.
The International Monetary Fund warned that the government's tax cut plans were likely to fuel the cost of living crisis and increase inequality.
Sir Keir Starmer is the leader of the Labour Party.
The budget needs to be abandoned before more damage is done.
The government will release further plans to boost growth and reduce public debt on November 23rd.
The Treasury said it would work with the Bank in support of its objectives.