A strict real interest rate has to be measured from an inflation-adjusted yield, such as the TIPS real yield — a series most investors have no convenient way to track. This site uses a simplified definition instead: the 10-year Treasury nominal yield minus CPI year-over-year, which we call the quasi real rate.
On the current snapshot the 10-year Treasury yields 4.99% (2026-09-18, +29bp over 20 days) and CPI is running at 3.4% year-over-year (2026-08), which puts the quasi real rate at ≈1.59%. What that number means: the margin by which holding a risk-free Treasury beats inflation in nominal terms — in other words, the approximate return forgone by holding gold, an asset that pays no yield.
A positive reading of 1.59% means nominal yields are still above inflation, so the coupon compensation for holding Treasuries is positive — in theory a modest opportunity-cost headwind for gold. The structure behind the number matters, though. The 10Y yield sits in the 99th percentile of its 52-week range and is labelled flat in trend terms, having risen 29bp over 20 days to 4.99%; the CPI leg, 3.4% year-over-year, is a lagged monthly print published on 2026-09-11 with the next release due 2026-10-14.
If inflation cools while nominal yields hold high, the quasi real rate widens passively. If oil instead lifts inflation expectations — Brent is at 103.87 USD/barrel, up 25.9% over 30 days — the reading can narrow again. For now gold is not visibly buckling under the positive reading: the COMEX live tick is 4418.56 USD/oz, +36.96 on the day (+0.84%), against a latest daily close of 4415.9 USD/oz (2026-09-18).
| Key readings behind this page | Value | As of |
|---|---|---|
| US 10Y Treasury yield | 4.99% | 2026-09-18 |
| US 30Y Treasury yield | 5.31% | 2026-09-18 |
| CPI, year-over-year | 3.4% | 2026-08 |
| Core PCE, year-over-year | 3.38% | 2026-Q2 |
| PPI, year-over-year | 5.44% | 2026-08 |
| COMEX gold, latest close | 4415.9 USD/oz | 2026-09-18 |
| COMEX gold, live tick | 4418.56 USD/oz (+36.96, +0.84%) | 2026-09-19 04:59:59 |
| Shanghai gold Au99.99 | 951.12 CNY/g (+0.52%) | 2026-09-19, night session close |
| Brent crude | 103.87 USD/barrel (+25.9% over 30 days) | 2026-09-18 |
| US Dollar Index (DXY) | 100.217 | 2026-09-19 |
| Federal funds target range, upper bound | 4.0% | 2026-09-17, next meeting 2026-10-29 |
| Federal debt as a share of GDP | 122.6% | 2026-Q1 |
The first limit is a data mismatch. The 10Y yield is a market series that moves in real time, while CPI year-over-year is an official monthly print published with a lag — the 3.4% for 2026-08 describes past inflation, not the future inflation the market is pricing. A nominal 10-year yield already embeds inflation expectations and a term premium, so subtracting a backward-looking CPI reading means subtracting a rear-view number from a forward-looking price. Around an inflation turning point, such as the current phase of rapidly rising oil prices, the distortion in the 1.59% reading is amplified, which is why it should not be used as a precise timing signal.
The second limit is the choice of index. CPI year-over-year measures the price of a consumer basket, whereas gold's traditional anchor is closer to a broader notion of currency debasement and purchasing-power erosion. In the snapshot, PPI year-over-year is 5.44% (2026-08), well above the 3.4% CPI reading, and core PCE at 3.38% (2026-Q2) also differs from CPI. Switch the subtrahend to PPI and the quasi real rate turns negative, flipping the direction of the conclusion entirely. That is the point: a single-definition quasi real rate is highly sensitive to the denominator, and 1.59% is only one of several defensible readings.
Even if the quasi real rate were exact, it would still be only one of gold's drivers. The site's ranked driver factors currently read: Treasury yield trend −100, oil-to-CPI transmission −100, policy pricing −60, the dollar index −58, central-bank gold buying +45, the US debt burden +39, risk sentiment (VIX) −5, inflation direction −4 and SPDR ETF holdings +4.
| Driver factor | Score | Window |
|---|---|---|
| Treasury yield trend | −100 | 20d |
| Oil→CPI transmission | −100 | 30d |
| Policy pricing | −60 | Sep FOMC |
| US Dollar Index (DXY) | −58 | 20d |
| Central-bank gold buying | +45 | structural |
| US debt burden | +39 | structural |
| Risk sentiment (VIX) | −5 | 20d |
| Inflation direction | −4 | 2mo |
| ETF holdings (SPDR) | +4 | 1d |
Central banks that report to the IMF net-bought +281 t of gold over the last 12 months (2025-08 to 2026-07), and US federal debt stands at 122.6% of GDP (2026-Q1, net interest outlays 1247.0 USD billions annualised). Structural forces of that size can outweigh the opportunity-cost pressure implied by a 1.59% quasi real rate. The short end adds a further complication: the upper bound of the federal funds target range is 4.0% (2026-09-17) with the next decision due 2026-10-29, while market pricing on Polymarket puts hike odds at 100.0%, so the front end and the long end are telling different stories — which weakens the explanatory power of "10Y minus CPI" on its own.
Treat the 1.59% reading as a directional thermometer rather than a precise ruler. When the reading trends wider while gold weakens, the opportunity-cost logic is in charge; when the reading narrows or turns negative, the relative appeal of holding gold rises. In practice, cross-check alternative denominators — PPI at 5.44% and core PCE at 3.38% — rather than relying on CPI alone, and watch the cross-market linkage between the dollar index at 100.217, Brent at 103.87 USD/barrel and Shanghai gold at 951.12 CNY/g. No single indicator prices gold completely; the quasi real rate is only the first piece of the framework. For the live readings and the full driver breakdown, go back to the daily dashboard.
From the current snapshot: the 10-year Treasury yield of 4.99% (2026-09-18) minus CPI year-over-year of 3.4% (2026-08), which gives approximately 1.59%. It approximates the excess return on holding a Treasury over inflation, that is, the opportunity cost of holding gold, which pays no yield. Note that the 10Y is a live market series while CPI is a lagged monthly official print, so the two are not perfectly aligned in time.
You can, but the conclusion changes. PPI year-over-year is 5.44% (2026-08), above the 4.99% 10Y yield, so on a PPI denominator the quasi real rate turns negative. Core PCE year-over-year is 3.38% (2026-Q2), close to the 3.4% CPI gauge, so that variant lands near the headline reading. Different denominators capture different stages of price transmission; cross-check several rather than trusting a single number.
Because opportunity cost is only one driver. The snapshot shows IMF-reporting central banks net-bought +281 t over the last 12 months (2025-08 to 2026-07), US federal debt at 122.6% of GDP (2026-Q1), and Brent up 25.9% over 30 days to 103.87 USD/barrel transmitting through inflation expectations. Gold's live tick stands at 4418.56 USD/oz (+0.84%), so structural buying and inflation worry are partly offsetting the positive carry.
Not on its own. It has three limits — a maturity and release mismatch, a publication lag, and high sensitivity to the denominator — and it distorts most around inflation turning points. It works better as a trend thermometer: watch whether the reading is widening or narrowing, and combine it with policy pricing (Polymarket hike odds 100.0%), the dollar index at 100.217 and other readings. Nothing here is investment advice.
Source: Gold Data Reading · XAU Daily — https://xaudaily.com/ · All figures above are taken verbatim from the site's English readings payload (snapshot 2026-09-20 11:00 JST) and match the daily dashboard item by item. These are daily readings, not investment advice.