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🐶 Options Puppy Beginner Guide: Why Banks Can Fall When Interest Rates Rise — And What TLT, T-Bills and SSB Have to Do With It

Part 1 · Understanding banks, bonds, interest rates and safer places to park cash · Singapore investor edition

🐶 1. Why I Want to Understand Bank Stocks Before Buying More

As Options Puppy, I like to understand what is happening behind the numbers before I put my money into the market. When I look at Singapore banks such as OCBC, DBS and UOB, I know that they are not simply businesses that collect deposits and lend money. They also manage enormous portfolios of financial assets, including government bonds.

Sometimes, investors hear that interest rates are rising and immediately assume banks should benefit because banks can charge borrowers more interest. That sounds logical, right? 🐶💰

But the stock market is not always that straightforward.

A bank can earn more from lending at higher interest rates while simultaneously suffering losses on its existing bond investments. Higher rates can also increase deposit costs, weaken borrowers’ ability to repay loans and make investors question how much a bank is worth.

That is why I want to understand three things:

* 🏦 Why can bank shares fall when interest rates rise?

* 🇺🇸 Why do banks hold long-term US government bonds, and what happens when their prices fall?

* 💵 Should I consider US Treasury bills, Singapore T-bills or Singapore Savings Bonds (SSB) when deciding where to keep my cash?

My goal is not to predict every market move. It is to understand the risks, protect my capital and make more informed decisions.

🏦 2. How Banks Actually Make Money

A bank’s basic business model is relatively simple. It takes deposits from customers and uses part of that money to provide loans and invest in financial assets.

Imagine I deposit S$10,000 into a bank savings account. The bank might pay me interest on my money, while lending money to a homebuyer or business at a higher rate.

The difference between the interest a bank earns on its assets and the interest it pays on its funding is a major part of its business.

This is closely related to something called the net interest margin (NIM).

For example, imagine a simplified bank:

Interest earned

4.5%

From loans and interest-earning assets

Interest paid

2.0%

On deposits and other funding

Simplified interest spread

2.5 percentage points

4.5% − 2.0%, before other costs and adjustments

This is an illustration, not the actual NIM of any Singapore bank.

When interest rates rise, banks may be able to charge higher rates on new loans or loans whose rates reset. But depositors may also demand better interest rates. Banks may need to pay more to retain their deposits.

If loan income rises faster than funding costs, the bank can benefit. If funding costs rise faster, its profit margin may shrink.

My first lesson: rising interest rates are not automatically good or bad for every bank. I need to examine the bank’s funding structure, loan book, bond portfolio and ability to manage risk.

📉 3. Why Bank Stocks Can Fall When Interest Rates Rise

There are five important reasons I want to remember. 🐶

Reason 1: Existing bonds lose market value.

Banks often own government bonds and other fixed-income securities. When interest rates rise, newly issued bonds generally offer higher yields. Older bonds with lower fixed coupon payments become less attractive, so their market prices usually fall.

Reason 2: Deposits become more expensive.

Imagine a bank previously paid depositors 1% interest. When competing banks offer higher rates, customers may move their money unless their existing bank offers a more attractive rate.

The bank might then need to increase deposit rates, reducing the difference between what it earns on loans and what it pays for funding.

Reason 3: Borrowers may struggle.

Higher interest rates can increase mortgage payments and business borrowing costs. Some borrowers may delay spending, reduce investment or struggle to repay their loans.

If loan defaults increase, banks may need to set aside more money for credit losses.

Reason 4: Investors worry about future profits.

The stock market values banks based on expected future earnings, dividends, risks and growth. If investors expect higher credit losses or weaker profit margins, bank shares can fall even if the bank is still reporting profits.

Reason 5: The economy may slow down.

If higher interest rates reduce economic activity, demand for loans may weaken. Businesses might borrow less, consumers may spend less and some property markets could cool.

This can affect loan growth and the quality of a bank’s assets.

My takeaway is simple: interest rates affect both sides of a bank’s balance sheet — the assets it owns and the money it owes to depositors.

🇺🇸 4. The Hidden Risk: Banks Holding Long-Term US Government Bonds

This is where things get particularly interesting.

US Treasury bonds are debt securities issued by the US government. Banks hold government bonds for several reasons, including liquidity management, investment income and balance-sheet management. Government bonds are generally considered to have very low credit risk when denominated in the government’s own currency, but they still carry interest-rate risk.

Imagine a bank buys a long-term US Treasury bond when market yields are low. The bond pays a fixed coupon for many years.

Later, interest rates rise substantially. New bonds now offer higher yields, so the older bond with its lower coupon becomes less attractive.

The bank still receives its contractual payments, assuming the issuer pays as promised. But if it tries to sell that old bond before maturity, it may receive much less than it paid.

🐶 Options Puppy’s bond example

Illustrative figures only — not a live Treasury quote.

Original bond purchase

US$1,000

Fixed coupon: 2%

Possible new market value

US$800

Illustrative 20% decline

The bank could still receive the original principal at maturity if the bond is held to maturity and the US government pays as promised. However, selling it at US$800 would turn the US$200 shortfall into a realised loss.

The example simplifies the actual mathematics: the size of a bond’s price decline depends on its maturity, coupon, yield changes and other factors.

🧾 What is an unrealised loss?

An unrealised loss is a decline in an investment’s market value that has not yet been locked in through a sale.

For banks, accounting treatment matters. Some securities are classified as available for sale, while others are classified as held to maturity. The treatment of valuation changes differs between these categories.

But I should not assume that an unrealised loss is harmless. If a bank faces deposit withdrawals and needs cash, it may have to sell securities at depressed prices. That can turn a paper loss into an actual loss and put pressure on liquidity or capital.

This is one reason investors may become nervous about a bank even when the bonds it owns are issued by the US government.

📊 5. Why Long-Term Bonds Are More Sensitive Than Short-Term Bonds

A bond’s sensitivity to interest-rate changes is commonly measured using duration.

The longer the duration, the more its price tends to move when yields change.

For example, a short-term Treasury bill may mature in six months. Its market price is generally much less sensitive to interest-rate changes than that of a 20- or 30-year Treasury bond.

A long-term bond commits investors to a stream of payments far into the future. When market yields change, the present value of those future payments can change significantly.

That creates an important distinction:

* Short-term government securities are generally more suitable for money I need soon.

* Long-term government bonds can be useful for investors who want long-duration exposure and can tolerate price fluctuations.

* Long-term bonds can potentially rise sharply in price when yields fall, but they can also fall sharply when yields rise.

The key is not just whether a government bond is safe from default. It is also whether I can tolerate its market price moving before I need my money.

📈 6. What Is TLT, and Why Does It Matter?

TLT

US-listed long-term Treasury bond ETF

TLT invests in US Treasury bonds with more than 20 years remaining until maturity. It gives investors exposure to long-duration US government debt without needing to buy individual bonds themselves.

TLT is useful for understanding the relationship between interest rates and asset prices because it makes long-term bond exposure accessible through the stock market.

But I must remember something important: TLT is not the same as a Treasury bill, a bank deposit or a fixed deposit.

Its market price fluctuates, and the ETF does not have a fixed maturity date at which I can expect my original investment to be repaid.

🐶 How interest rates affect TLT

Scenario A: Long-term yields fall Existing long-term bonds become more attractive, so their prices generally rise. TLT may gain value.

Scenario B: Long-term yields rise Existing long-term bonds become less attractive, so their prices generally fall. TLT may lose value.

Notice that I said long-term yields, not just the Federal Reserve’s policy rate. TLT’s price depends heavily on long-term Treasury yields, which can move because of inflation expectations, government borrowing, economic growth and investor demand.

The Federal Reserve can cut its short-term policy rate while long-term yields remain high. Therefore, I should not buy TLT simply because I expect the Fed to cut rates.

As a reference point, BlackRock’s published data for 5 October 2026 showed TLT’s effective duration at 14.68 years and its 30-day SEC yield at 5.56% as of 2 October. Those figures are historical snapshots, not guaranteed future returns.

A duration of around 14.7 years suggests substantial interest-rate sensitivity. As a rough illustration, a one-percentage-point increase in yields could imply about a 14.7% price decline before accounting for convexity and other factors. This is a sensitivity estimate, not a price forecast.

🏦 Does TLT mean Singapore banks will fall?

Not necessarily.

TLT helps me understand the risks of long-term bonds, but I cannot assume every Singapore bank has the same bond holdings or risks as a US regional bank.

Singapore banks have different business mixes, funding structures, liquidity positions and risk-management practices. I would need to examine each bank’s financial statements before drawing conclusions about its bond exposure.

For OCBC, DBS and UOB, I would monitor net interest margin, deposit costs, credit provisions, capital strength and management commentary rather than use TLT as a direct signal to buy or sell bank shares.

💵 7. Singapore T-Bills: Are They Good for Parking Cash Now?

For someone investing from Singapore, Treasury bills issued by the Singapore Government are worth considering when the objective is to preserve capital and earn a return while waiting for investment opportunities.

A Singapore T-bill is a short-term government security. It is normally sold at a discount and redeemed at face value at maturity.

For example, if I buy a hypothetical T-bill for S$9,900 and receive S$10,000 at maturity, my S$100 difference is the investment return, before considering any applicable costs.

The actual purchase price and return depend on the auction or secondary-market price.

📌 What are yields like now?

According to the Monetary Authority of Singapore’s published statistics, the six-month benchmark T-bill yield was around 1.87% on 6 October 2026. The latest auction cut-off yield reported for a six-month issue dated 29 September was 1.92%. These are different measures, so I should not treat them as interchangeable or assume the next auction will offer the same yield.

At a hypothetical annualised yield of 1.92%, a S$10,000 investment held for approximately six months might earn around S$96 before costs, using a simple half-year approximation. The actual return depends on the auction price and exact holding period.

That is not an enormous return, but I would compare it with the alternatives available to me.

🐶 Why I might use T-bills

* Defined maturity: I know when the security is scheduled to mature.

* Shorter interest-rate exposure: Its price is generally less sensitive to interest-rate changes than a long-term bond.

* Capital planning: I can match maturities with the dates when I expect to need my cash.

* Opportunity fund: I can set aside money for future purchases of OCBC, DBS, UOB or US stocks without exposing the whole amount to share-price fluctuations.

However, T-bills are not instant-access savings accounts. If I need the money before maturity, selling in the secondary market may produce a different price. Auction allocations, settlement arrangements and the possibility of having to reinvest at lower yields also matter.

For money I might need tomorrow, I would keep an appropriate amount accessible rather than lock everything away.

🇸🇬 8. Singapore Savings Bonds (SSB): A Different Way to Save

Singapore Savings Bonds are another option I would consider.

Unlike conventional bonds whose market prices fluctuate, SSBs can be redeemed through the government at their original principal value, with accrued interest, under the programme’s rules. They are designed for individual investors who want flexibility and a return that increases the longer they hold the bond.

Here is how I would compare them with T-bills.

Singapore T-bills

* Generally suitable for short, defined holding periods.

* The yield is set by the auction or the price paid.

* If held to maturity, the government pays the face value under the security’s terms.

* If I need to exit early, the market price may differ from my purchase price.

Singapore Savings Bonds

* Designed for savings over periods of up to 10 years.

* Interest rates step up over time.

* I can redeem monthly at the original principal value, plus accrued interest, under the programme’s redemption process.

* I can exit without selling at a fluctuating market price, but redemption is not instant.

The October 2026 SSB issue, which began on 1 October, offered a reported average annual return of approximately 1.97% over five years and 2.32% over ten years. These are issue-specific rates, not a promise that future SSB issues will offer the same return.

For someone who values flexibility, SSBs have an important advantage: if rates rise in the future, I can consider redeeming my existing bonds and applying for a new issue with more attractive rates. I would compare the new issue’s terms with the stepped-up interest I would give up before switching.

The trade-off is that I cannot simply sell an SSB on the stock exchange whenever I want. I must follow the monthly redemption process.

🐶 9. T-Bills vs SSB vs TLT: Which Makes More Sense for Me?

Here is my practical comparison as a Singapore investor.

Feature Singapore T-bills SSB TLT

Main purpose Short-term cash parking Flexible longer-term saving Long-duration bond exposure

Market price risk If sold early No market-price loss on redemption under programme rules Significant

Access to cash At maturity, or earlier sale Monthly redemption process Market trading hours

Income Auction/market yield Stepped-up coupons Variable distributions

Currency SGD SGD USD

Best use Planned near-term spending Savings with flexible duration Interest-rate investment strategy

My decision framework

If I need the money within 3–12 months

I would compare T-bill maturities with a suitable savings account or money-market option. I would not use TLT for money I cannot afford to see fluctuate.

If I want savings flexibility over several years

I would compare the latest SSB’s five-year and ten-year average returns with available T-bill yields. I would also consider whether the monthly redemption process meets my cash-flow needs.

If I expect long-term US yields to fall

I might research TLT as a potential investment, but I would account for its duration, currency risk and the possibility that yields rise instead.

🐾 10. My Final Lesson as Options Puppy

I like having cash ready because the stock market can offer opportunities when prices fall. But keeping cash productive is not the same as chasing the highest advertised yield.

If I am waiting to buy OCBC, DBS, UOB or US stocks, I want my cash strategy to match my investment horizon. A T-bill can suit a defined short-term period, SSBs can offer longer-term savings flexibility, and TLT is a separate investment with meaningful market risk.

I also need to distinguish between a bank suffering a temporary valuation loss on its bonds and a bank facing a genuine liquidity or capital problem. They are not the same thing.

My guiding principle is simple: protect the money I need, keep enough liquidity for opportunities, and take investment risks only when I understand what could go wrong. 🐶💰

If you found this beginner guide useful, like, subscribe and comment with the next topic you want Options Puppy to explain.

Disclaimer: This article is for educational purposes only and is not personal financial advice. Yields change, investments carry risks, and past or illustrative returns do not guarantee future results. Check official MAS, CDP and fund-provider information before investing.

$iShares 20+ Year Treasury Bond ETF(TLT)$  

$OCBC Bank(O39.SI)$  

$DBS(D05.SI)$  

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