A Shocking Shift: Japan's Rising Interest Rates Are Changing Who Profits

by Kenichi Ogura - Former Chief Editor of PRESIDENT (Japan’s No.1 business magazine)

Banks are the clearest place to look for gains from Japan's rising interest rates. Higher returns on loans and investments strengthen their earnings. For investors, the decisive question is how much of that improvement is already in the share price. Bank stocks have already risen sharply.

From Negative Rates to 1%

The Bank of Japan, the country's central bank, ended negative interest rates in March 2024. It raised its policy rate to around 1% in June 2026 and held it there in July. This target for overnight lending between financial institutions influences borrowing costs across the economy. Longer rates reflect expectations about future policy and inflation.

For years, low rates supported spending and helped Japan fight weak price growth. The central bank began withdrawing that support as rising wages and prices brought sustained inflation of 2% within reach. Inflation is the overall rise in consumer prices. By June 2026, keeping inflation from exceeding the target had become a concern as well.

How Higher Rates Reach Bank Profits

Banks earn interest on loans, bonds, and some money held at the central bank. The amount left after paying interest on deposits and other borrowing is net interest income. When the rates banks earn rise faster than their funding costs, this income increases. Loans with adjustable rates pass on changes relatively quickly. Fixed-rate loans keep their existing terms until those terms expire or are renegotiated.

Banks with low deposit costs retain more of the extra interest income. Accounts used for salaries and household bills give customers reasons to stay beyond the interest rate. Companies placing spare cash have a stronger incentive to seek the best return.

What the Banks Are Estimating

Sumitomo Mitsui Financial Group (SMFG) set out the earnings effect in its September 2026 investor presentation. Its model puts the first-year increase in net interest income at about 110 billion yen for a quarter of a percentage point rise in both short and long yen rates. The calculation assumes deposit rates follow historical patterns. Expenses, taxes, and loan losses determine how much reaches final profit.

SMFG, Mitsubishi UFJ Financial Group, and Mizuho Financial Group are Japan's three megabanks. Resona Holdings offers greater exposure to domestic banking. All publish estimates of gains from higher yen rates. Comparing them requires matching the measures and time periods used. Overseas operations and fee income remain important to the larger groups.

Competition for deposits is already testing those estimates. In its May 2026 results discussion, Mizuho reported stronger competition for corporate deposits. It retained its estimate and identified higher deposit costs as a reason for a possible future revision. Paying customers more directly reduces the bank's net interest income.

The Risks: Borrowers and Bond Portfolios

Borrowers' finances matter just as much. Strong sales support interest payments. Thin profits, weak demand, and debt needing replacement soon put borrowers under strain. Unpaid loans reduce bank profits. Rising wages and spending ease this adjustment; expensive energy adds to the burden on households and companies.

Banks also lend to governments and companies by owning bonds. Older bonds with fixed payments lose market value when comparable new bonds offer higher returns. The loss in value exists before any sale. Accounting rules govern its effect on reported earnings and capital. Holding a bond until repayment preserves the promised cash payments if the issuer pays in full.

The Rally Is Already in the Price

Investors have already rewarded bank shares. Over the twelve months ending August 31, 2026, the TOPIX Banks Index returned roughly 78%, against about 38% for TOPIX, which tracks the broader Japanese market. Both figures include reinvested dividends and are measured in yen, according to the Japan Exchange Group's August factsheet.

After that rally, higher earnings are only part of the investment case. Investors also decide how much to pay for each yen of profit.

Life Insurers Reinvest at Higher Yields

Life insurers benefit from better returns on new investments. They invest premiums to fund payments due years or decades later. Higher bond income strengthens their ability to meet those commitments. The improvement spreads through their portfolios as old investments mature and new premiums arrive.

Dai-ichi Life Group is speeding up that process by replacing older bonds. Its August 7, 2026 results presentation described sales in the quarter ending June and expected higher income above the returns assumed in its policy commitments. The sales recognized losses already present in market values. The test for the replacement investments is the income they earn and their ability to provide cash when policyholders need paying.

Customer withdrawals create another demand for cash. Better savings products give policyholders a reason to move their money. Dai-ichi reported low, stable overall cancellation and lapse rates at its two main domestic life businesses.

J-REITs: Financing Costs Versus Rents

For Japanese real estate investment trusts, or J-REITs, higher rates increase the cost of financing rental properties. Refinancing debt at a higher rate leaves less profit to distribute. Fixed-rate borrowing delays that increase. Share prices respond immediately to changes in the returns investors demand. Rising rents help cover the larger interest bill. Investors seeking property income also compare it with the improving returns available from bonds.

At a lower purchase price, the same rental income delivers a higher return. In its June 2026 outlook, Daiwa Asset Management became more positive about J-REITs following a price decline. Its assessment rested on lower purchase prices and expected rent increases. It also cut its year-end forecast for the Tokyo Stock Exchange REIT Index.

Growth Stocks and the Currency Question

Growth shares face a tougher test when safer investments pay more. Investors demand a stronger reason to pay high prices for profits expected years away. Companies must justify those prices through earnings growth. Businesses that fund expansion from their own earnings have less dependence on lenders.

Foreign investors must also account for the yen. A stronger yen against the dollar raises the dollar value of Tokyo investments. It reduces the reported yen value of profits earned in foreign currencies, including cash left overseas. Goods priced in foreign currencies become cheaper in yen. Each company's foreign revenues, costs, and debts determine its exposure.

Japanese rate increases alone do not determine the yen's direction. Foreign rates, policy expectations, and investors' appetite for risk also shape it. Currency hedging, such as contracts fixing future exchange rates, limits investors' direct exposure. The currency's effect on company profits remains.

Banks with low deposit costs and borrowers who keep paying are best placed to gain from higher rates. For investors buying after the rally, the job is to judge those future profits against today's price.