Source: Ministry of Finance Japan
This service uses government bond interest rate data published by the Ministry of Finance Japan, but the content of this service is not guaranteed by the Ministry of Finance.
This service uses statistical data published by the Bank of Japan, but the content of this service is not guaranteed by the Bank of Japan.
At the end of January 2026, the JGB market traded in the low-2% area with the 10-year JGB yield at 2.247%. The real interest rate (nominal 10-year yield minus CPI year-on-year) rose into positive territory at 0.747%. With headline CPI year-on-year falling to 1.5%, the long-standing financial repression that had supported Japanese public finances (negative real rates) is showing signs of dissipation. At the same time, ultra-long yields surged: the 30-year yield reached 3.577% and the 40-year yield 3.681%, widening the 30Y-10Y spread to 1.330%. The yield curve is upward sloping across maturities from 1 year at 0.996% to 40 years at 3.681%, exhibiting a bear steepening driven by larger increases at the long end. This pattern is consistent with BOJ policy normalization and rising market caution about ultra-long fiscal credibility, and it could mark an inflection point where interest-payment pressures on a debt-to-GDP ratio exceeding 250% intensify materially.
MOF data show that at end-January 2026 JGB yields rose across the curve. Starting from 1 year at 0.996%, yields step up to 2 years 1.251%, 5 years 1.666%, and 10 years 2.247% in the mid-term segment, then to 15 years 2.848%, 20 years 3.186%, 30 years 3.577%, and 40 years 3.681% in the ultra-long zone, forming a typical upward-sloping yield curve that reaches the high 3% range at the longest maturities.
Monthly average yields are broadly consistent with month-end levels—2 years 1.215%, 5 years 1.653%, 10 years 2.203%, 20 years 3.134%, 30 years 3.526%—confirming a sustained upward trend through the month. The rise is particularly pronounced in the ultra-long zone, where the slope beyond 20 years has steepened markedly.
This shape corresponds to a bear steepening: while short-term yields are rising in line with policy normalization, long-term yields are rising by more, implying that markets are pricing higher long-term fiscal sustainability risk, stronger inflation expectations, and increased term premia. For a country like Japan with a debt-to-GDP ratio above 250%, rising ultra-long yields directly translate into higher future interest-payment burdens and increase the risk of fiscal rigidity.
Using MOF data, term spreads compute as follows: the 10Y-2Y spread is 0.996%, the 30Y-10Y spread is 1.330%, and the 40Y-10Y spread is 1.434%.
A 10Y-2Y spread of 0.996%—roughly 1%—is within a typical range for expansionary phases and functions as a cyclical signal: a positive and widening spread generally reflects expectations for future economic growth. Given that inverted yields (negative spreads) are often leading indicators of recession, the current roughly 1% level suggests markets are not pricing an imminent sharp economic downturn.
By contrast, the 30Y-10Y spread of 1.330% is relatively large and indicates rising required yields in the ultra-long segment. This spread reflects market assessments of ultra-long fiscal credibility, inflation expectations, and liquidity premia. In Japan, 30- and 40-year bonds have historically been supported by fiscal investment needs and long-term investors such as pension funds, but a spread above 1.3% implies these investors are demanding higher risk premia. In particular, BOJ quantitative tightening (QT) can alter the supply-demand balance for ultra-long JGBs, and as price discovery normalizes, fiscal risk and term premia may become more explicitly priced into yields.
The 40Y-10Y spread of 1.434% similarly signals market scrutiny of fiscal sustainability over the longest horizons. Because 40-year bonds have limited issuance and low liquidity, a liquidity premium is embedded, but a spread above 1.4% points to market caution about fiscal management extending decades forward.
The real interest rate in January 2026 rose to 0.747%, calculated as the nominal 10-year yield 2.247% minus headline CPI year-on-year 1.5%. This marks an important structural shift for Japanese public finances.
For decades Japan benefited from negative real interest rates—financial repression—where nominal yields were below inflation, allowing the government to borrow at effectively low real cost and erode the real value of outstanding debt. This mechanism was an important brake on explosive increases in the debt-to-GDP ratio amid ageing and low growth.
The shift to a positive real rate of 0.747% suggests that this regime is ending. The main driver was the decline in headline CPI year-on-year from 2.1% in December 2025 to 1.5% in January 2026, reflecting cooling price pressures after an earlier rise. MIC Statistics Bureau data show headline CPI peaked at 3.7% in February 2025 and has declined since, reaching 1.5% in January 2026. Meanwhile, the core index (excluding fresh food) stands at 2.0% and the core-core index (excluding food and energy) at 2.6%, indicating persistent underlying inflation pressures.
A positive real rate raises the government’s real borrowing cost. Real interest payments on newly issued debt increase, and the real value of existing debt no longer erodes. For savers, positive real returns increase incentives to hold JGBs, but the net effect is a real transfer from the government to the private sector.
In the debt-dynamics identity d(t) = d(t-1) × [(1+r)/(1+g)] − pb(t), an increase in the effective interest rate r worsens the debt ratio. Japan has long relied on r<g (interest rate below growth) to stabilize debt, but with real rates turning positive and nominal rates rising, the r-g differential may narrow or reverse. Unless nominal GDP growth accelerates commensurately, fiscal sustainability conditions will tighten.
Policy-rate (call rate) data were not available for this analysis period, preventing a quantitative assessment of the BOJ policy stance versus JGB yields. Nevertheless, the broad rise in JGB yields and the positive real rate are consistent with BOJ policy normalization (rate hikes and QT).
The 1-year yield at 0.996% being near 1% suggests policy rates have moved away from the zero bound into positive territory. Mid-short yields—2 years 1.251%, 5 years 1.666%—indicate the market is pricing additional rate hikes over the coming years.
BOJ QT directly affects JGB supply-demand dynamics. For decades the BOJ was the largest JGB holder (around a 46% holding share), supporting the market. QT-driven reductions in BOJ holdings restore price-discovery to private investors, making fiscal risk and the term premium more visible in yields. The rise in ultra-long yields likely reflects eased demand from the BOJ and higher risk premia demanded by investors.
Monetary tightening transmits via higher short-term rates to increase bank funding costs, affecting lending rates and corporate financing conditions. Concurrently, higher JGB yields raise interest payments on new issuance and on rolled-over debt, tightening fiscal space. Given Japan’s gross financing needs—new issuance plus debt refinancings—run at about JPY 200 trillion annually, even small yield increases can raise interest payments by several trillion yen.
Cabinet Office business-cycle indicators show the coincident index peaked at 117.0 in February 2025 and has trended down to 114.9 in September 2025, while the leading index fell from 110.2 in December 2025 to 108.0 in September 2025. These series suggest a slowdown in expansion or a plateauing of growth.
METI’s seasonally adjusted industrial production index peaked at 102.2 in February 2025, and while full data are not available, January 2025 recorded 99.9, a month-on-month decline of −1.1%, indicating weakness in manufacturing activity.
The coexistence of slowing growth indicators and rising JGB yields may seem contradictory, but it can be rationalized. First, the primary driver of higher rates is BOJ policy normalization—an exogenous supply-side factor relative to the business cycle. Second, falling inflation raises real rates even without large nominal rate increases, so real rates can rise in a slowing economy. Third, the ultra-long yield increases reflect long-term fiscal credibility and risk premia rather than near-term cyclical conditions.
However, a deeper growth slowdown would weaken tax revenues and worsen the primary balance, further pressuring fiscal metrics. In the debt equation, a lower nominal GDP growth rate g widens the r-g gap and pushes the debt ratio upward. Close monitoring of the interaction between growth and interest rates is therefore essential.
BOJ Tankan (2025 Q4) shows the large-manufacturers manufacturing DI at 15.0 (expected 12.0) and large-manufacturers non-manufacturing DI at 34.0 (expected 28.0). Manufacturing DI improved slightly from 14.0 in 2025 Q3 but the outlook at 12.0 is cautious, reflecting external uncertainty. SME manufacturing DI remains low at 6.0, highlighting a pronounced gap by firm size.
Non-manufacturing DI is high at 34.0, signaling resilience in domestic demand; however the outlook DI at 28.0 is 6 points below the current reading, indicating firms are cautious about future conditions.
The assumed FX rate in 2025 Q4 is 147.06 JPY for all sizes and industries, and 146.48 JPY for large-manufacturer respondents, shifting from 145.68 JPY in 2025 Q3 toward yen depreciation. Yen weakness supports exporters’ profits but raises import costs and hence domestic inflationary pressure.
From a fiscal perspective, rising rates increase corporate financing costs and can damp investment and hiring—effects especially acute for SMEs, which are more rate-sensitive. Deteriorating corporate performance would also lower corporate tax receipts, pressuring the fiscal outlook. While a resilient services sector supports tax revenues, manufacturing caution remains a risk for an export-oriented economy.
The structural changes signaled by the Jan 2026 JGB market carry several important implications for Japanese public finances:
First, the shift to positive real rates signals the end of financial repression and higher real borrowing costs. With new issuance yields in the low-2% range and ultra-long yields in the high-3% range, annual gross financing needs around JPY 200 trillion imply a definitive rise in interest payments. If average funding costs rose by 0.5 percentage points, annual interest payments would increase by about JPY 1 trillion, exacerbating fiscal rigidity.
Second, the r-g differential will be pivotal for debt sustainability. With a real rate of 0.747%, an ongoing nominal GDP growth rate around 2% would maintain r<g, but a growth slowdown risks narrowing or reversing the gap. For Japan, with a debt-to-GDP ratio above 250%, a flip to r>g raises the risk of debt ratio divergence.
Third, the rise in ultra-long yields shows markets are increasingly wary of long-term fiscal sustainability. The 30Y-10Y spread at 1.330% and 40Y-10Y at 1.434% reflect higher long-term risk premia. BOJ QT could expose previously suppressed fiscal risks to market pricing.
Fourth, the domestic holdings buffer (BOJ 46% + domestic institutions 88%) still functions as a stabilizing factor, but BOJ QT reducing the BOJ’s share will gradually alter this structure. If foreign holdings rise, the JGB market will become more sensitive to exchange-rate risk and global interest-rate moves, potentially increasing volatility.
Fifth, improving the primary balance is an urgent challenge. When the r-g differential moves against the government, primary surpluses are the only reliable lever to stabilize debt ratios. But demographic-driven increases in social spending and weak revenue growth make achieving primary surpluses difficult.
Key variables to watch are the pace of BOJ policy normalization, inflation trajectories, nominal GDP growth, and the government’s stance on fiscal consolidation. Markets have begun to signal concern over fiscal sustainability via the ultra-long yield uptick. Taking this warning seriously and articulating a credible medium-to-long-term consolidation path will be essential to maintain fiscal credibility. Navigating fiscal management has become more difficult in an environment where real rates have turned positive.
Real interest rate: The nominal interest rate minus the inflation rate. In this analysis, the real rate = nominal JGB 10-year yield − CPI year-on-year. Negative real rates imply financial repression and allow the government to borrow at low effective real cost; positive real rates imply higher real borrowing costs for the government.
Financial repression: A regime in which nominal interest rates are below inflation. This enables the government to borrow at low real cost and erode the real value of existing debt. It has functioned as an important mechanism to ease fiscal burdens in high-debt countries.
Term spread: The yield differential between government bonds of different maturities. The 10Y-2Y spread serves as a cyclical signal; the 30Y-10Y spread reflects ultra-long fiscal credibility and inflation expectations. A positive and widening spread suggests growth expectations, while an inverted spread (negative) is often a leading indicator of recession.
Bear steepening: A steepening of the yield curve accompanied by rising yields, where long-term yields increase more than short-term yields. It often reflects rising inflation expectations or greater fiscal risk premia.
r-g differential: The difference between the effective interest rate (r) and nominal GDP growth (g). This is the key driver in debt dynamics: if r<g, the debt ratio tends to improve; if r>g, it tends to worsen. Japan has benefited from r<g for many years, but rising rates and weaker growth increase the risk of reversal.
Gross financing needs: The sum of fiscal deficits (new bond issuance) and the amounts needed to roll over maturing debt. Japan’s gross financing needs reach about JPY 200 trillion annually; small increases in yields can raise interest payments by several trillion yen. This metric is linked to rollover risk.
QT (quantitative tightening): A central-bank policy that reduces the stock of assets on its balance sheet. As the BOJ reduces JGB holdings, private investors’ price-discovery functions are restored and fiscal risk and term premia are more likely to be reflected in yields.
Business-cycle indicators (CI): Indicators published by the Cabinet Office to assess current economic conditions and near-term prospects. They comprise leading, coincident, and lagging indexes. A rising coincident index indicates expansion; a falling one indicates contraction.
Tankan DI (business conditions DI): An index from the BOJ’s Tankan survey that measures firms’ sentiment: the percentage reporting 'good' minus the percentage reporting 'bad.' A positive value indicates improving business conditions; a negative value indicates deterioration.
This column was automatically generated by AI integrating Ministry of Finance JGB interest rate data, tax revenue data, Bank of Japan statistics, and e-Stat public statistics as a fiscal analysis resource. This is not a recommendation to buy or sell any financial instruments or government bonds. Please make investment decisions at your own responsibility and consult professionals as needed.