The same bill on both conventions: coupon equivalent versus discount basis
Answered against 22 years of US equities and 12 years of US options data and published with the query that produced it. This result is stored as of 2026-10-07, from T-Bill Maturities and How Yields Are Quoted.
| tenor_point | term | investment_rate_pct | discount_rate_pct | gap_bps |
|---|---|---|---|---|
| 3-month point | 91 days | 3.83 | 3.74 | 8.8 |
| 1-year point | 365 days | 3.96 | 3.76 | 20.3 |
- Rows × columns
- 2 × 5
- Computed
- Completeness
- No missing values
- Source
- US exchange, SIP and OPRA market data
- Licence
- Strasmore terms · free, no signup
What each column holds
| Column | Type | Range | Notes |
|---|---|---|---|
tenor_point |
text | 2 distinct values (1-year point, 3-month point) | |
term |
text | 2 distinct values (365 days, 91 days) | |
investment_rate_pct |
number | 3.83 to 3.96 | percent |
discount_rate_pct |
number | 3.74 to 3.76 | percent |
gap_bps |
number | 8.8 to 20.3 |
Computed from Strasmore's warehouse of US exchange, SIP and OPRA market data. Equity prices are delayed; options greeks and implied volatility are end-of-day. This result is stored, not recomputed on load — it is exactly the numbers that were returned on , and the query below is what returned them.
Run it yourself
This is the exact query behind the result above. Change a ticker, a date or a column and run it against the warehouse — no account, no key. The no-signup tier is smaller than the one this page was computed on; a query that reaches past it comes back saying which plan runs it.
WITH bill_points AS
(
SELECT
tupleElement(pt, 1) AS tenor_point,
tupleElement(pt, 2) AS maturity_days,
tupleElement(pt, 3) AS investment_rate
FROM
(
SELECT arrayJoin([
('3-month point', 91, toFloat64(yield_3_month)),
('1-year point', 365, toFloat64(yield_1_year))
]) AS pt
FROM global_markets.treasury_yields
WHERE date >= '2026-04-01'
AND date < '2026-09-26'
AND yield_3_month > 0
AND yield_1_year > 0
)
),
converted AS
(
SELECT
tenor_point,
maturity_days,
concat(toString(maturity_days), ' days') AS term,
investment_rate,
36000 / maturity_days
* (1 - 1 / (1 + investment_rate / 100 * maturity_days / 365)) AS discount_rate
FROM bill_points
)
SELECT
tenor_point,
term,
round(avg(investment_rate), 2) AS investment_rate_pct,
round(avg(discount_rate), 2) AS discount_rate_pct,
round(avg(investment_rate - discount_rate) * 100, 1) AS gap_bps
FROM converted
GROUP BY tenor_point, term, maturity_days
ORDER BY maturity_days
Work with this data in your AI assistant
Opens ready to query, with this page's data. Free, no account.