How Banks Work: Profit, Fees, and Your Money

Banks Are Businesses, Not Vaults

When you deposit $500,000 pesos into your bank account, the money does not sit in a vault with your name on it. The bank uses your deposit — along with millions of other deposits — to make loans, invest in securities, and generate profit. Understanding this fundamental reality changes how you think about every interaction with your bank.

A bank is a business with a simple core model: it borrows money cheaply (your deposits) and lends it at a higher rate (mortgages, consumer loans, credit cards). The difference between what it pays you and what it charges borrowers is the spread bancario, and this spread is the engine that drives bank profitability.

In Chile, this business model operates under the supervision of the CMF (Comisión para el Mercado Financiero) and within the monetary framework set by the Banco Central. The rules governing how much banks can lend, how much they must keep in reserve, and how they must treat customers shape every product and fee you encounter.

How Banks Make Money

The Interest Rate Spread

Suppose a bank pays you 3% annual interest on your cuenta de ahorro but charges 15% on a consumer loan. That 12-percentage-point spread, multiplied across billions of pesos in deposits and loans, generates enormous revenue. In Chile, the average spread has historically been higher than in many developed countries, reflecting the market structure and risk profile of Chilean borrowers.

The TPM set by the Banco Central serves as the floor for this system. When the TPM is at 5%, banks might pay 3-4% on deposits and charge 10-25% on different types of credit. When the TPM rises to 11% (as it did in 2023), both sides of the equation shift upward, but the spread tends to remain relatively stable.

Fees and Commissions

Beyond interest income, Chilean banks earn significant revenue from fees:

• Monthly maintenance fees (comisiones de mantención): Many cuenta corriente products charge $3,000 to $15,000 pesos monthly unless you maintain a minimum balance or have a payroll deposit.
• ATM fees: Withdrawing from another bank’s ATM typically costs $500 to $1,500 pesos per transaction. International ATM withdrawals are even more expensive.
• Transfer fees: While TEF (electronic fund transfers) are increasingly free for basic accounts, some accounts still charge for transfers above a monthly limit.
• Card replacement fees: Losing your debit or credit card can cost $5,000 to $15,000 pesos for a replacement.
• Insurance premiums: Banks often bundle insurance products (desgravamen, card theft insurance) into account packages, sometimes without clear disclosure.

Investment and Treasury Operations

Banks also profit from managing their own investment portfolios — buying government bonds, corporate securities, and participating in the interbank lending market. These treasury operations generate income that does not directly involve customer-facing products.

The Encaje: Why Banks Cannot Lend Everything

The Banco Central requires banks to keep a percentage of their deposits in reserve — the encaje. This requirement exists to ensure that banks always have enough liquid funds to meet withdrawal demands from depositors.

In Chile, the encaje for demand deposits (like cuenta corriente and cuenta vista) is higher than for term deposits (like DAP), because demand deposits can be withdrawn at any time while term deposits have a fixed maturity. If the encaje is 9%, a bank receiving $100,000,000 pesos in demand deposits can lend out approximately $91,000,000 pesos.

This creates what economists call the money multiplier effect. Your $500,000 peso deposit becomes a loan to someone else, who deposits it in another bank, which lends most of it again. Through this chain, the banking system creates far more money in the economy than the Banco Central originally issued. Understanding this process helps you see why bank stability and regulation are so important.

How the TPM Affects Your Daily Life

The TPM (Tasa de Política Monetaria) is the interest rate at which banks lend to each other overnight. While this sounds abstract, it directly influences every financial product you use:

When the TPM rises:

• Credit card interest rates increase
• Consumer loan rates go up
• Mortgage rates rise (both new and variable-rate existing loans)
• Depósito a plazo (DAP) rates improve — your savings earn more
• The economy tends to slow as borrowing becomes more expensive

When the TPM falls:

• Borrowing becomes cheaper across all products
• DAP and savings account returns decline
• Economic activity tends to increase
• It becomes a better time to take on debt (especially fixed-rate)

Between 2022 and 2023, the Banco Central raised the TPM from 0.5% to 11.25% in response to post-pandemic inflation. This dramatic increase made credit cards and consumer loans significantly more expensive, while DAP rates rose to levels not seen in over a decade. Understanding these cycles helps you time major financial decisions intelligently.

Understanding the CAE

The CAE (Carga Anual Equivalente) is Chile’s standardized measure for comparing the total cost of credit products. Unlike a simple interest rate, the CAE includes all mandatory costs: the nominal interest rate, administration fees, insurance premiums, notary costs, and any other charge the borrower must pay.

Why the CAE Matters

Two credit cards might both advertise a monthly interest rate of 2.5%, but one charges an annual maintenance fee of $50,000 pesos while the other charges nothing. The CAE captures this difference in a single number, making comparison straightforward.

By Chilean law, every credit product must display its CAE prominently. When comparing loans or credit cards, always compare CAE to CAE — never compare nominal interest rates alone.

Reading the CAE

A consumer loan with a CAE of 30% means that the total cost of the credit, including all fees and charges, is equivalent to paying 30% annual interest. A mortgage with a CAE of 5.5% in UF means the total annual cost is 5.5% above inflation (since UF already adjusts for inflation).

Lower CAE means cheaper credit. Period. This is the single most important number when evaluating any borrowing decision.

Common Bank Fees in Chile and How to Avoid Them

Chilean banks charge dozens of different fees, but a few account for most of the money consumers lose unnecessarily:

Monthly Account Maintenance

Many cuenta corriente plans charge $5,000 to $15,000 pesos monthly. To avoid this:

• Ask about fee-free plans tied to payroll deposits (cuenta nómina)
• Consider BancoEstado’s Cuenta RUT, which has no monthly maintenance fee
• Compare plans across banks — fee structures vary significantly
• Negotiate with your bank if you have been a long-term customer

Overdraft Charges

Using your línea de crédito (overdraft line) on a cuenta corriente triggers interest charges that are often among the highest of any bank product. The interest on overdrafts can exceed 40% CAE. Never use your overdraft as a regular funding source.

Foreign Transaction Fees

Using your Chilean debit or credit card abroad or for international online purchases typically adds a 2-4% foreign transaction fee on top of the exchange rate. Some banks offer products with reduced or zero foreign transaction fees — worth investigating if you travel or shop internationally.

ATM Withdrawal Fees

Using another bank’s ATM costs $500 to $1,500 pesos per transaction. Over a year, weekly cross-network ATM withdrawals could cost you $30,000 to $80,000 pesos. Plan your withdrawals to use your own bank’s ATM network, or switch to a bank or neobank that reimburses ATM fees.

How to Read Your Bank Statements

Your monthly bank statement (cartola) contains critical information that most people ignore:

• Balance summary: Opening and closing balances for the period
• Transaction detail: Every deposit, withdrawal, transfer, and card payment
• Fees charged: All commissions and maintenance fees deducted
• Interest earned or charged: Interest on savings and interest on any credit lines used
• Tax withholding: The impuesto de timbres y estampillas on credit transactions

Review your cartola monthly. Look for charges you do not recognize, fees that seem excessive, and patterns in your spending. This review takes five minutes and can save you thousands of pesos annually by catching errors and unauthorized charges early.

Tools like Finthy can automate this review by connecting to your accounts and categorizing transactions, flagging unusual charges, and tracking fees over time.

What Banks Owe You

Chilean law and CMF regulations give you specific rights as a bank customer:

• Transparency: Banks must disclose all fees, commissions, and interest rates before you sign any contract. The CAE must be displayed prominently.
• Account portability: You have the right to move your payroll account (portabilidad financiera) to any bank you choose, regardless of where your employer deposits your salary.
• Right to close accounts: Banks cannot unreasonably prevent you from closing an account or canceling a product.
• Complaint resolution: If you have a dispute, you can file a complaint through SERNAC Financiero, which mediates between consumers and financial institutions.
• Data protection: Banks must protect your personal and financial information under Chile’s data protection laws.

Key Takeaways

• Banks are businesses that profit primarily from the spread between what they pay on deposits and what they charge on loans.
• The encaje (reserve requirement) limits how much banks can lend, while the TPM (Tasa de Política Monetaria) set by the Banco Central influences all interest rates in the economy.
• The CAE (Carga Anual Equivalente) is the single most important number when comparing credit products — it includes all costs, not just the interest rate.
• Monthly maintenance fees, overdraft charges, ATM fees, and foreign transaction fees are the most common unnecessary costs consumers pay.
• Review your cartola monthly to catch errors, unauthorized charges, and excessive fees.
• You have legal rights to transparency, account portability, and complaint resolution through SERNAC Financiero.

In the previous lesson, you learned what money is and how inflation works. In the next lesson, you will discover how Chile’s financial system is structured and who protects your rights as a consumer.