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Consumption Tax Cuts in the Extraordinary Diet Session: What the JGB Market Cares About—The Order of Reading Funding Sources and Interest Rates

The reference point for this article is 8:03 AM on October 5, 2026. The 222nd Extraordinary Diet session is being convened today, and it is reported that Prime Minister Takaichi is scheduled to deliver a policy speech in the afternoon. Since the content of the speech cannot yet be confirmed through finalized documents, I will organize here which figures investors should track, based on the legislative policy the Prime Minister indicated at her September 23 press conference and the already published JGB issuance plan.

What the market wants to know is not just the sentiment of whether one is for or against tax cuts. When will the policy to support households begin, how much funding does it require, and how will those costs be covered? Only once these points are specified can the impact on corporate earnings, prices, JGB supply and demand, and interest rates be compared.

At her September 17 press conference, the Prime Minister explained a plan to lower the consumption tax rate to 1% for two years on food and beverages currently subject to the reduced tax rate, as well as a policy to secure funding without relying on special deficit-covering bonds. The National Tax Agency’s special page has posted information regarding the reduction of the tax rate on food and beverages from April 1, 2027, to March 31, 2029. While the direction and planned duration of the policy have been specified, investors must wait for the scale of the revenue loss and the breakdown of the measures to fill the gap in order to estimate the fiscal impact.

Listen to today’s speech by separating policy headlines from execution procedures.

According to the Prime Minister’s Office press conference on September 23, the government explained that it wants to achieve results in the extraordinary Diet session regarding bills related to consumption tax and support payments, as well as bills related to the diversification of crude oil procurement in response to the situation in the Middle East. This is the policy indicated by the government. It does not mean that the bill’s text, effective date, scope, breakdown of funding sources, and timing of passage in the Diet have been finalized.

Currently, the reduced tax rate applied to food and beverages is 8%. The plan explained by the Prime Minister is to lower this to 1% for two years, a difference of 7 percentage points. If one were to purchase 50,000 yen worth of eligible items (excluding tax) every month, and the tax cut were fully reflected in the retail price, the calculated burden reduction would be 3,500 yen per month. This is a hypothetical calculation to show the mechanism and is not a prediction of the actual savings for each household or the extent of the decline in retail prices. The results will change if the target items, price pass-through, or purchase volumes change.

The tax cut proposal has the potential to lighten the burden on households at the time of purchase. However, it does not necessarily mean that consumption will increase by the same amount as the tax cut. Households may put the saved money toward savings or debt repayment, or they may shift spending to items other than food. For retail and food companies, profitability will be influenced not only by an increase in sales volume but also by price tag changes, register and accounting system modifications, procurement costs, and the degree to which the tax cut is reflected in retail prices.

Therefore, it is premature to conclude from the words in the speech that there will be a uniform tailwind for consumption-related stocks. It is better to wait until the policy’s target, duration, preparations for implementation, and price pass-through mechanism are visible before considering how much it will reach the sales and profits of which companies.

Household support through tax cuts and filling the revenue gap are separate calculations.

Tax cut measures have both the aspect of increasing the money remaining in households and the aspect of reducing tax revenue for the national and local governments. The policy objective of easing the burden of living and the change in the fiscal balance that the JGB market watches can occur simultaneously. If you only focus on one side, you will misinterpret the path to the market.

The actual loss in tax revenue will vary depending on the target items, tax rate, consumption behavior, and tax revenue allocation to local governments. At the proposal stage, a figure like “trillions of yen in revenue loss” cannot be treated as a confirmed value because the basis cannot be verified. While the government’s explanation states a policy of not relying on special deficit-covering bonds, the next step for confirmation is to cross-check which expenditures will be reviewed and which revenues will be allocated in the bills and budget documents. The meaning received by the market will differ depending on whether the government reshuffles existing expenditures, uses non-tax revenue, expects other tax revenue increases, or issues additional JGBs.

In her September 23 press conference, the Prime Minister touched on a bill regarding the diversification of crude oil procurement in addition to the consumption tax and support payment bill. Expenditure on energy security, unlike simple temporary household benefits, involves a period for changing equipment and procurement sources. It is necessary to look separately at not only the scale of the investment amount but also how much it will suppress fluctuations in import prices and how it will change costs for companies and households.

Explanations of funding sources reach long-term interest rates through JGB supply and demand.

When the amount of JGBs issued by the government in the market increases, investors provide new funds to hold those bonds. If other conditions remain unchanged and buyer demand does not keep up with the increase in issuance, there may be a move to seek higher yields, causing bond prices to fall. Since prices and yields move in opposite directions, the outlook for JGB supply is a factor in considering long-term interest rates.

The “fiscal credibility” viewed here is not an abstract reputation. It means that investors verify how concrete the revenue and expenditure plans are, whether the implementation period is limited, and whether there is a track record of securing the promised funding sources. Even if it is decided to cover the tax cuts with additional JGB issuance, the supply reaching the market will change depending on the timing and maturity of the issuance and how it is combined with already scheduled redemptions and refinancing.

However, it is not a simple relationship where interest rates will necessarily soar if an increase in issuance is decided. If tax revenue and nominal growth are strong and the outlook for future debt burdens improves, the market’s reception may change even if there is an increase in JGB issuance. The Bank of Japan’s JGB purchases, demand from banks, insurance companies, and pension funds, overseas interest rates, and price outlooks also move yields simultaneously.

In the Ministry of Finance’s fiscal year 2026 issuance plan, the breakdown of market issuance amounts is shown by maturity. For example, the plan is 1.8 trillion yen for 40-year bonds, 7.2 trillion yen for 30-year bonds, 8.4 trillion yen for 20-year bonds, and 31.2 trillion yen for 10-year bonds. This is the current issuance plan and not the additional issuance amount to cover this tax cut bill. If a supplementary budget is presented in the extraordinary Diet session, we will first cross-check that budget scale and funding source, and then how the Ministry of Finance revises the issuance plan.

Do not confuse the plan that reduced super-long-term bonds with the story of additional funding sources.

In the Ministry of Finance’s plan, the initial market issuance amount for fiscal year 2026 is 1.2 trillion yen less for 40-year bonds, 2.4 trillion yen less for 30-year bonds, and 3.6 trillion yen less for 20-year bonds compared to the initial amount of the previous fiscal year. On the other hand, the plan is to increase 2-year bonds by 2.4 trillion yen and 5-year bonds by 1.2 trillion yen. A composition of reducing the supply of super-long-term bonds and increasing medium-to-short-term bonds is shown.

Even in the September 40-year bond auction, it was not possible to judge a recovery in demand for super-long-term bonds solely from the rise in the bid-to-cover ratio. The method of reading the bid amount and the winning yield separately is organized in the article comparing the 40-year bond auctions.comparing the 40-year bond auctions.

This breakdown is useful when considering the supply and demand of government bonds as a whole. However, one cannot say that ‘because the issuance of super-long-term bonds will decrease, the issue of tax cut funding is minor.’ What we are looking at here is the predetermined annual plan. If new tax cuts or expenditures are decided, the total amount, redemption timing, and the maturity at which they will be procured will have to be decided anew.

When interest rates move in response to fiscal news, do not judge solely by the reported total budget amount; instead, check the amount of government bonds that make up the funding, the difference from existing plans, and the maturity of the issuance. For example, whether issuance is concentrated in short maturities or supplied broadly across long maturities affects the burden on bank operations and the demand from pension and insurance companies. This is the reason for lining up the movements for each maturity, such as 2-year, 10-year, and 30-year, in addition to the magnitude of the interest rate rise.

The effect of rising interest rates on stock prices varies by company

When government bond yields rise, the cost for companies to raise funds through corporate bonds or borrowing may increase. For companies whose profits are skewed toward the future, there are times when the interest rate used to discount earnings to present value rises, creating a headwind for stock price valuation. On the other hand, companies that can pass on price increases in a phase where prices and wages are rising, or companies that can increase demand, may see sales and profit growth exceed the interest burden.

The reaction of financial institutions is also not one-way. While rising yields on newly invested funds can be a tailwind, a decline in the price of bonds already held will result in valuation losses. It also depends on how quickly deposit interest rates and funding costs rise, and to what extent they can be passed on to lending rates. Rather than judging by industry name alone, one should check the bond holdings, interest margins, and funding structure in the financial results materials.

If tax cuts boost household consumption, they may support sales for food retail, dining out, and life-related services. However, the effect varies depending on the company’s sales composition and response to price changes. If expectations are already priced into stock prices before the policy is implemented, the news may be ‘priced in’ once the bill is passed. It is important not to treat short-term price movements triggered by policy headlines and actual changes in corporate profits as the same thing.

The Bank of Japan’s interest rate decisions are determined by wages and prices, not just fiscal policy

When reading the government bond market, try not to treat the government’s fiscal resource discussions and the Bank of Japan’s interest rate hike decisions as the same thing. The supply of government bonds and the supply-demand balance of buyers affect long-term interest rates. On the other hand, the policy interest rate decided by the Bank of Japan is a comprehensive assessment of prices, wages, economic activity, and the financial environment. Even if market interest rates rise, it does not automatically mean the Bank of Japan will decide to raise rates at the next meeting.

In the ‘Summary of Opinions’ from the September meeting released by the Bank of Japan on October 1, the assessment that the economy and prices are progressing in line with the outlook was noted, along with vigilance against upside risks to prices, including high crude oil prices and exchange rates. Opinions that the policy interest rate should be raised and opinions that it should be kept on hold based on current economic conditions and prices were also listed together. This document is a summary of the opinions of the policy board members and is not a unified forecast of the future.

If food prices fall due to tax cuts, it may work to push down part of the consumer price index. However, because exchange rates, energy, wages, and corporate sales prices move simultaneously, underlying prices are not determined solely by food tax cuts. When reading Bank of Japan materials, look at which opinions emphasize the sustainability of prices and which emphasize consideration for the economy to grasp the policy path separate from fiscal policy.

This week, check the wording of the bill, government bond auctions, and Bank of Japan materials separately

This week, political schedules and bond market materials will follow in close succession. In the Ministry of Finance’s October auction calendar, auctions for 10-year bonds are scheduled for October 6 and 30-year bonds for October 8. Auction results are one piece of data reflecting demand for a specific maturity, but they do not determine the assessment of the entire fiscal situation on their own. Read the bid-to-cover ratio, the winning yield, the market yield before and after the auction, and the planned issuance amount together.

According to the Bank of Japan’s publication schedule, the output gap, potential growth rate, and labor supply-demand related indicators are scheduled to be released at 14:00 on October 5. A regional economic report is also scheduled for October 8. These are not materials that show the funding for tax cut proposals, but they are materials for considering the underlying trends in the economy, prices, and wages. If the economy is strong, the need for demand stimulus measures changes, and if wages and prices are weak, the effect of household support may be viewed as more significant. Do not form a conclusion before the materials are released; check them after the numbers come out.

The order of verification is: first, grasp the target, deadline, and implementation conditions through speeches and bills. Next, look at the scale of the fiscal resources and supplementary budget, and wait to see how that content is reflected in the existing government bond issuance plan. Finally, check the auctions and market yields. This way, you can avoid misinterpreting politicians’ ambitions as finalized expenditure amounts.

How to read after the announcement can also be divided into three parts. If the breakdown of fiscal resources is shown and covered by adjustments to the existing budget, the additional impact on government bond supply and demand will likely differ from a new issuance proposal. If the tax cut is time-limited and the target and implementation conditions are clear, it becomes easier to update future tax revenue forecasts. Conversely, if the scale is shown but the explanation of fiscal resources is postponed, the market is in a stage of waiting for additional materials. In any case, these are not predictions that dictate the direction of the market, but branches for identifying the information necessary for the next judgment.

Consider the impact on readers by separating it into held assets and living expenses

For those who hold individual government bonds or bond funds, the impact of rising interest rates differs depending on the product. For individual bonds held until maturity and bond investment trusts where prices are updated daily, the way intermediate price movements appear in asset valuation differs. Please check the holding period, changes in the net asset value, and price fluctuations at the time of redemption in the investment report or product description document.

Those who invest only in deposits should be aware that short-term interest rate hikes are not necessarily reflected in deposit interest immediately. Financial institutions may revise deposit and lending rates at different speeds. If you are in the middle of repaying a mortgage, checking whether it is fixed or variable, the next interest rate review date, and the rules for changes in repayment amounts is more practical information than following the wording of a speech.

Those who hold stocks should look not only at whether the company sells products subject to tax cuts, but also at whether the company can maintain prices and absorb procurement and labor costs. Will sales forecasts rise after the supplementary budget announcement, or will procurement costs increase due to increased government bond issuance and rising interest rates? There is a time lag between policy expectations and actual results until they are reflected in the financial figures.

What connects the government’s fiscal policy and market interest rates is not slogans, but multiple stages: institutional design, budget, fiscal resources, issuance plans, auctions, and corporate earnings. Those who hold government bonds should check price fluctuations and holding periods, those who hold stocks should check demand and procurement costs, and households should check tax burdens and interest rate conditions, respectively. If you follow the path closest to your own assets, you can assemble your reaction to the news a little more calmly.

Summary: Do not rush to market conclusions until funding sources and implementation dates are clear

While the policy direction of the extraordinary Diet session creates expectations for household support, the impact on government bond supply and corporate earnings cannot be determined until the funding sources and execution timing are solidified. Checking the language of speeches, the form of bills, supplementary budgets, issuance plans, and market auction results in order will help distinguish between anticipation and actual change.

Today is a day to record what has been decided and what is still under consideration, rather than filling in the scale of policies with imagination. Review your government bond holding periods, deposit and loan interest rate conditions, and the financing and price pass-through of your stock holdings once, and add only the necessary information to your own judgment when the next documents are released.

We will continue to deliver articles that connect the market and households

We will continue to track how interest rates, exchange rates, government bonds, and corporate earnings reach households and assets while verifying primary sources. If you are interested in this way of reading the market, please follow our account and see our next article.

Sources

Disclaimer: This article is for informational purposes only and does not recommend the purchase or sale of any specific financial product, stock, or transaction. Please make investment decisions at your own risk.

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