How to Invest in Bonds: Treasuries, I Bonds and More

The short answer: a bond is a loan that pays you interest#

A bond is one of the oldest and simplest investments there is: you lend money to a government or company, and in return they pay you regular interest and give your money back on a set date. Where a stock makes you a part-owner betting on growth, a bond makes you a lender collecting steady income. That is why bonds are the classic counterweight to stocks — generally lower risk, lower return, and far more predictable.

For everyday investors, bonds do two jobs. They generate income you can count on, and they steady the ride when stock markets get rough, because high-quality bonds often hold their value — or rise — when shares fall. The safest of all are backed by governments; in the US that means Treasury securities, considered among the lowest-risk investments in the world.

This guide explains what a bond actually is, the main types available to US investors, how to buy them through TreasuryDirect or a broker, how yields and prices move, the tax angle, and how bond funds fit in. It also covers the Canadian toolkit of GICs and government bonds. One note: this is general education, not investment advice.

• A bond is a loan — you lend to a government or company for interest.
• Steady income — regular coupon payments, principal back at maturity.
• A counterweight to stocks — lower risk, lower return, more predictable.
• Government bonds are safest — US Treasuries lead the list.

What is a bond, exactly?#

When you buy a bond you are handing over your money for a fixed period. In exchange you receive a coupon — the interest rate the bond pays, usually twice a year — and at the maturity date you get your original amount, the face value, back. A $1,000 bond paying a 4% coupon hands you $40 a year, then returns your $1,000 at the end. Simple and predictable, which is the whole appeal.

One quirk trips people up: a bond’s price and its yield move in opposite directions. If you hold to maturity it barely matters — you get your face value regardless. But if you sell early, a bond bought when rates were low is worth less after rates rise, and vice versa. Understanding that seesaw is the key to bonds, and we come back to it below.

The main types of bonds#

US investors have a full menu. Treasury securities are issued by the federal government: T-bills (one year or less, sold at a discount), T-notes (two to ten years) and T-bonds (twenty to thirty years). TIPS are Treasuries whose value rises with inflation, and Series I savings bonds (I bonds) are a separate inflation-linked product aimed at everyday savers.

Beyond Treasuries sit municipal bonds, issued by states and cities, whose interest is often free of federal tax, and corporate bonds, issued by companies, which pay more because they carry more risk. The reference overview at Wikipedia’s entry on US Treasury securities is a solid primer. As a rule, the safer the issuer, the lower the yield — you are paid for the risk you take.

How to buy Treasuries#

You have two easy routes. The first is TreasuryDirect, the US Treasury’s own website, where you can buy Treasuries and I bonds directly from the government with no middleman and no fees. It is the simplest way to hold individual Treasuries or to grab I bonds up to the annual limit. The official TreasuryDirect site walks through opening an account and placing orders.

The second route is a brokerage account, where you can buy Treasuries, corporate and municipal bonds, and — most conveniently — bond funds and ETFs that hold hundreds of bonds at once. Brokers make it easy to build a diversified bond position in one click, which for most people is more practical than buying individual bonds one at a time.

I bonds and inflation protection#

I bonds deserve their own mention because they solve a specific problem: protecting savings from inflation. Their rate has two parts — a fixed rate that lasts the life of the bond, and an inflation rate that resets every six months — so the payout rises when prices rise. You can buy up to $10,000 per person per year through TreasuryDirect, and they must be held at least a year.

That makes I bonds a natural home for medium-term savings you want to keep safe in real terms, and one of several ways to protect your money from inflation. They are not a get-rich investment — they are a shield. For cash you cannot afford to lose but do not need for a year or two, they are hard to beat.

Bonds versus CDs and savings#

Bonds are not the only safe place for money, and it helps to see where they sit. A CD locks a fixed rate for a set term and is federally insured, while a high-yield savings account stays liquid and variable. Bonds sit alongside these: Treasuries are extremely safe and, unlike a CD, can be sold before maturity, though their price will move with rates in the meantime.

Which one wins depends on your goal. For money you might need any moment, a savings account is right; for a fixed horizon, weigh a bond against a certificate of deposit or a high-yield savings account. Often the answer is a mix — a short bond ladder or CDs for near-term needs, longer bonds for steadier income later.

Bond funds and ETFs#

Buying individual bonds means picking issuers and maturities and reinvesting as they mature — doable, but fiddly. A bond fund or ETF does it for you, holding a broad basket of bonds so you get instant diversification and easy monthly income, all in a single, liquid investment you can buy like a stock.

The trade-off is that a bond fund has no single maturity date, so its price floats with interest rates rather than snapping back to a face value on a set day. For most investors that is a fair price for the convenience, and understanding the difference between funds and the bonds inside them is part of choosing well — the same logic that guides picking index funds and ETFs for stocks applies here.

Yields, prices and interest-rate risk#

Here is the seesaw again, because it is the one thing to truly grasp. When market interest rates rise, the price of existing bonds falls — nobody wants your old 3% bond when new ones pay 5% — and when rates fall, existing bonds gain value. The longer a bond’s maturity, the more its price swings, which is called interest-rate risk (or duration).

The practical takeaways are simple. If you hold a bond to maturity, these price swings are noise: you still get your face value and coupons as promised. If you might sell early, or you own a bond fund, expect the value to move as rates change. And in a period of high rates, longer bonds lock in that yield for longer — a feature if rates then fall, a drawback if they keep rising.

How bonds are taxed#

Taxes shape your real return, and bonds have their own rules. Interest from corporate bonds is fully taxable. Interest from US Treasuries is taxable at the federal level but exempt from state and local tax, a quiet bonus in high-tax states. And most municipal bond interest is exempt from federal income tax, which is why munis appeal to higher earners even at lower headline yields.

Selling a bond for more than you paid also creates a capital gain, so the same rules from how capital gains tax works apply on top of the interest. Holding bonds inside a tax-advantaged retirement account sidesteps much of this, which is often the tidiest place for the taxable interest that bonds throw off each year.

For Canadians: GICs and government bonds#

Canada’s fixed-income toolkit looks a little different. The everyday workhorse is the GIC (guaranteed investment certificate) — a bank product much like a US CD, locking a fixed rate for a set term and protected by deposit insurance. Alongside GICs sit Government of Canada bonds and provincial bonds, bought through a brokerage, which trade like other bonds and carry the same rate-versus-price seesaw.

One thing to note: the old Canada Savings Bonds are gone, discontinued years ago, so GICs and marketable government bonds are now the core retail options. The Bank of Canada’s interest-rate pages are a useful reference for the rates that drive them. As in the US, holding these inside registered accounts like a TFSA or RRSP shelters the interest from tax.

Mistakes to avoid#

None of these are exotic. They are the ordinary missteps that turn a safe, boring bond into an unnecessary loss, and each is easy to sidestep.

• Reaching for yield — chasing a high coupon usually means taking on far more risk.
• Ignoring interest-rate risk — long bonds can fall hard in price if you must sell early.
• Forgetting inflation — a fixed 3% loses ground if prices rise faster; consider I bonds or TIPS.
• Holding all bonds in a taxable account — the annual interest can create a needless tax drag.
• Confusing a bond fund with a bond — the fund has no maturity date to snap back to.
• Owning only bonds — too safe is its own risk; most plans blend bonds with stocks.

The bottom line#

Bonds are the steady, unglamorous core of a resilient portfolio: a loan that pays you income, cushions the shocks from stocks, and — in the case of Treasuries and I bonds — offers about as much safety as investing allows. Start with what you need them for, income or stability, then match the type and maturity to your time horizon.

For most people the simplest path is a mix of government bonds or a low-cost bond fund for the core, an I bond or two for inflation-proof savings, and CDs or a savings account for cash you may need soon. Keep an eye on the rate-versus-price seesaw, mind the tax treatment, and bonds do exactly what they are meant to — quietly hold your plan together.