bonds / 20Y / JGB (20-Year) No. 178
Bond Information
| Name | JGB (20-Year) No. 178 |
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| ISIN | — |
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| Issue # | 178 |
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| Coupon (%) | 0.5% semi-annual |
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| Issue Date | 2021-10-20 |
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| Maturity | 2041-09-20 （Remaining 15y） |
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| Outstanding | ¥3.8T （2026-03-31・MOF） |
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| Total issued | ¥3.9T （annual report, FY-end） |
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| Statutory basis | 4条特例借換前倒財投 |
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| SLF usage | last 30d ¥1.7B／ total ¥35.1B（last 2026-09-04・BOJ） |
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| BOJ Holding | ¥236.2B（6.2%）（as of 2026-08-31・Source: BOJ・Ratios approximate due to differing as-of dates） |
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| Status | active |
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Results
Yield Calculator (price input) | Simple Yield | 0.500 % |
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| Compound Yield | 0.4995 % |
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| Accrued Interest | 0.242466 (177 days) per 100 |
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| Settlement Amount | — |
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| Modified Duration | 14.43 |
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| Macaulay Duration | 14.46 |
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| DV01 | — |
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| Convexity | 220.8 |
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Estimates based on the input price.
Cashflow Schedule
| Date | Type | Amount (per 100) |
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| 2026-09-20 | coupon | 0.250 |
| 2027-03-20 | coupon | 0.250 |
| 2027-09-20 | coupon | 0.250 |
| …（26 omitted）… |
| 2041-03-20 | coupon | 0.250 |
| 2041-09-20 | coupon + redemption | 100.250 |
Related Auctions
Horizon total return settle 2026-09-13 ・ CMT 2026-09-10
| CMT interpolated (rem 15.0y) | 3.464 % → ref. price 65.492 |
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| G-spread (vs interpolated CMT) | — |
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| Horizon | Scenario | Yield@H | Price@H | Carry | Total return | Ann. |
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| 3m 2026-12-13 | -50bp | 2.939 | 70.929 | -0.127 | +8.08% | +32.31% |
| -25bp | 3.189 | 68.503 | -0.127 | +4.39% | +17.55% |
| Unchanged (roll-down) | 3.439 | 66.166 | -0.127 | +0.83% | +3.33% |
| +25bp | 3.689 | 63.914 | -0.127 | -2.59% | -10.37% |
| +50bp | 3.939 | 61.744 | -0.127 | -5.90% | -23.58% |
| 6m 2027-03-13 | -50bp | 2.912 | 71.581 | 0.246 | +9.64% | +19.27% |
| -25bp | 3.162 | 69.171 | 0.246 | +5.97% | +11.94% |
| Unchanged (roll-down) | 3.412 | 66.847 | 0.246 | +2.44% | +4.87% |
| +25bp | 3.662 | 64.606 | 0.246 | -0.97% | -1.95% |
| +50bp | 3.912 | 62.445 | 0.246 | -4.26% | -8.52% |
| 12m 2027-09-13 | -50bp | 2.857 | 72.905 | 0.500 | +12.04% | +12.04% |
| -25bp | 3.107 | 70.528 | 0.500 | +8.42% | +8.42% |
| Unchanged (roll-down) | 3.357 | 68.234 | 0.500 | +4.93% | +4.93% |
| +25bp | 3.607 | 66.019 | 0.500 | +1.56% | +1.56% |
| +50bp | 3.857 | 63.881 | 0.500 | -1.69% | -1.69% |