Selic and CDI: difference, how they work and move stocks

Selic and CDI are the two backbones of Brazilian finance. One sets the cost of money for the whole economy; the other is the daily benchmark that banks use to price every debt contract, investment fund, and deposit in the country. Understanding the difference between them is essential for anyone who wants to make sense of what moves Brazilian equities.

TL;DR

• The Selic is the Central Bank's policy rate, set by the Copom committee; the CDI is an interbank overnight rate that tracks the Selic almost one-to-one.
• The Selic controls inflation and economic activity; the CDI is the reference rate for fixed-income yields like CDBs and FIIs.
• When the Selic rises, stocks tend to face headwinds: higher borrowing costs compress corporate earnings and discount rates rise, pulling valuations down.
• When the Selic falls, equities usually rally on cheaper capital and expectations of stronger earnings, though currency and inflation risks remain.
• The CDI itself does not move stocks directly, but the spread between CDI and Selic signals credit conditions that affect market liquidity.

What is the Selic?

The Selic (Special System of Liquidity and Custody) is Brazil's benchmark interest rate. It is the rate at which banks lend reserves to one another overnight in the secondary market, and the Central Bank of Brazil (BCB) uses it as its primary monetary-policy lever [2]. The Copom (Monetary Policy Committee) meets eight times a year and votes on the Selic target, adjusting it to keep inflation within the government's official target range [1].

The Selic affects the entire economy: mortgage rates, business loans, credit card interest, and the yield on government bonds all build on top of it. A higher Selic makes borrowing more expensive, cooling spending and inflation; a lower Selic does the opposite. As of mid-2026, B3's financial indicators page shows the Selic at 14.15% per year [4], reflecting the tighter cycle that has been in place since 2024.

What is the CDI?

The CDI (Certificado de Depósito Interbancário) is an interbank deposit rate that represents the average cost at which banks borrow and lend reserves overnight. Unlike the Selic, which is a single target set by the central bank, the CDI is a market-determined rate compiled by CETIP (now part of B3) [4]. Because banks can borrow or lend at the Selic with almost no risk, the CDI naturally converges toward the Selic over time, typically running within a few basis points of it.

The CDI serves as the reference rate for most fixed-income instruments in Brazil. When a CDB pays "100% of CDI," it means the depositor receives the average overnight interbank rate for that period. FIIs and many corporate loans also use the CDI as their pricing base [3]. The B3 financial indicators page tracks CDI alongside the Selic, and in 2026 both registers stood at 14.15% [4].

How Selic and CDI differ

The clearest way to see the gap is in what each one controls and how it is determined.

Because the Selic is a policy decision and the CDI is a market outcome, the two move together but are not identical. When Copom raises the Selic target, the CDI follows immediately. When Copom holds, the CDI may drift slightly inside the target corridor.

How the Selic moves stocks

The Selic works on equities through three main channels.

Discount rates. Stock valuations depend on discounting future earnings back to today. A higher Selic raises the discount rate, which compresses the present value of every future dollar of profit. The P/E ratio tends to compress when rates rise and expand when they fall [6]. This is why Brazilian equities often sell off after hawkish Copom surprises and rally on dovish ones.

Corporate earnings. Higher Selic means higher interest expense for companies with floating-rate debt. It also raises the cost of capital for new projects, potentially slowing investment and growth. When the Selic stays elevated for a long period, earnings expectations get trimmed, and the Ibovespa can struggle to make new highs. Analysts at Itaú projected the Selic could reach 15.75% in 2025 before the easing cycle began, and Ibovespa returns weighed on by the high-rate environment [7].

Currency and capital flows. A high Selic attracts foreign capital seeking yield, which can support the Brazilian real and equities in the short term. But sustained high rates also signal economic stress, which can deter long-term investors. The market tends to price in the expected path of the Selic rather than its current level alone. When analysts expect rate cuts, stocks often rally ahead of the actual decision [8].

How the CDI affects fixed income and indirectly stocks

The CDI does not move stocks directly, but it shapes the investing landscape. When CDs and CDBs pay near 100% of CDI at 14%+, fixed income becomes an attractive alternative to equities, pulling capital away from the stock market. This "yield competition" matters: in 2026, the combination of a 14.15% Selic and CDI [4] made fixed-income deposits yield more than the Ibovespa's dividend yield, contributing to the reallocation of capital away from stocks.

FIIs are a direct user of the CDI. Many FII portfolios hold debt instruments and real estate assets priced using CDI-linked rates [3]. When the CDI rises, financing costs for property owners inside the fund go up, which can squeeze net operating income and reduce dividend distributions. FIIs therefore tend to underperform equities during the early stages of a tightening cycle but can recover once rates stabilize.

Selic cuts and the equity rally cycle

Historically, Brazilian equities have rallied after the Selic cycle turns downward. The Ibovespa posted a 34% gain in 2025, its best annual return since 2016, as market participants priced in the eventual easing of monetary policy [9]. BB Investimentos expected the first Selic cut of 25 basis points in March 2026, targeting 12% by year-end, and projected the Ibovespa could reach 186,000 points [10]. The logic is straightforward: cheaper capital boosts corporate margins, raises the risk appetite of portfolio managers, and triggers a re-rating of the stock market.

Rate cuts also tend to weaken the real against the dollar, which is a mixed signal for equities. Export-oriented companies benefit from a weaker currency, while companies with dollar-denominated debt see their costs rise. The composition of the Ibovespa means the net effect depends on which sectors dominate at a given moment.

Common errors and fixes

FAQ

What is the current Selic rate? As of late July 2026, the Selic rate stands at 14.15% per year, according to B3's financial indicators page [4]. The BCB historical targets page confirms this is part of the elevated cycle that began in 2024 [1].

Does CDI ever diverge from Selic? Yes, but only within a narrow band. The CDI is a daily market rate for overnight interbank deposits, while the Selic is the central bank's target. When liquidity is tight, CDI can briefly exceed the Selic; when liquidity is abundant, it can fall slightly below. The BCB statistical portal tracks both [2].

Why do stocks fall when the Selic rises? Higher rates increase the discount rate used in valuation models, compressing P/E ratios [6]. They also raise corporate borrowing costs, which can squeeze margins and slow investment [7]. Foreign capital may also rotate out of equities into fixed-income instruments that now offer more attractive real yields.

Are FIIs affected by the Selic and CDI? Yes. FIIs rely on the CDI indirectly because their financing costs and the pricing of their underlying assets are tied to the interbank rate [3]. Fixed-rate FIIs are less sensitive to rate changes, but floating-rate exposure means rising CDI increases debt costs for property owners in the fund.

What happens to Brazilian stocks when the Selic starts falling? Equity markets typically rally on rate-cut expectations. The Ibovespa gained 34% in 2025 as the market anticipated the easing cycle [9]. Analysts projected the Ibovespa to reach 186,000 points in 2026 on the back of expected Selic cuts [10]. However, the currency weakenings that accompany rate cuts can offset gains for companies with dollar debt.

Is the CDI the same as the CDI daily rate? The CDI is quoted as an annualized rate, but the underlying calculation uses daily overnight interbank rates accumulated over the period. CDBs and other instruments that offer "100% CDI" multiply the daily CDI by the number of days in the investment period and annualize the result [5].

Can the Selic go below zero in Brazil? Under the current monetary regime, the Selic has a floor anchored by the overnight deposit rate at the BCB. Brazilian rates have not gone negative in recent history, and there is no current policy indication that they would. The BCB keeps the Selic above zero to preserve the functioning of the interbank market.

Sources

• B3 Financial Indicators — tracks Selic and CDI rates as of 2026.
• BCB Historical Targets — records of Copom Selic decisions.
• BCB Interest Rate Statistics — official time series for Brazilian rates.
• B3 FII Product Page — FII structure and characteristics.
• B3 Renda Variável Overview — variable income product categories.
• B3 FII Glossary — FII types, risks, and taxation.
• Investor.gov Stocks Basics — SEC guide on equities, risk, and returns [11].
• Nareit REITs Home — U.S. REIT market data and benchmarks.
• CVM Resolution 175 — Brazilian fund regulation framework.
• Wikipedia: P/E Ratio — valuation and discount-rate relationship [6].
• Wikipedia: Dividend Yield — yield analysis and market behavior.
• Wikipedia: Return on Equity — profitability metric linked to equity valuations.
• Portal de Finanças — CDI — CDI daily interbank figures (May–July 2026) [5].

Internal links

• Fundos de Investimento Imobiliário
• Renda Variável: tipos e características
• Taxa Selic e política monetária do BCB