Bond yields have gone up to their highest levels in about 20 years.

This affects anyone who borrows money.

It affects people who are struggling with inflation.

It also affects businesses that build AI data centers.

It matters to people who do not borrow too.

Savers can earn more interest from bonds or high-yield savings accounts.

But the value of stocks in their 401(k) accounts could fall.

For U.S. taxpayers, higher yields mean the federal government pays more interest on its debt.

That leaves less money for other needs.

Governments and big companies raise money by selling IOUs to investors.

They do not ask banks for loans.

IOUs that are paid back years later are called bonds.

Investors trade them in the bond market after they are issued.

If bonds look less attractive, a buyer can get one earlier worth $100 for less than that.

The bond still pays the same interest rate.

So the new buyer gets a bigger percentage return.

That return is called the yield.

When a bond's price drops, its yield rises.

The reverse is also true.

The U.S. Treasury is the center of the bond market.

Its yields are the baseline for most other borrowing rates.

A 30-year fixed mortgage rate, for example, is likely the 10-year Treasury yield plus more.

It depends on the borrower's credit score.

Different Treasury bonds affect different loans.

These include 12-month certificates of deposit and company borrowing.

They do not always move together.

But right now they are all rising.

The 10-year Treasury yield climbed to nearly 5.18% on Thursday.

It is back to where it was in 2007.

The yield has been climbing since it hit a low below 0.50% in 2020.

That was because of the COVID pandemic.

Its rise sped up after the war with Iran sent oil prices and inflation worries higher.

The average long-term U.S. mortgage rate has reached 7% for the first time since early 2025.

High Treasury yields also hurt prices for stocks, gold, and cryptocurrencies.

Much of the recent rise comes from higher oil prices and inflation worries.

It also comes from growing government and corporate debt.

Part of it also shows a solid U.S. economy.

That could lead the Federal Reserve to raise rates again.

Yields are climbing worldwide, including in Germany and Japan.