Lending in banking is the business of taking money that customers deposit and loaning it out to other customers at a higher interest rate, with the bank keeping the difference as revenue. That difference, called net interest margin, averaged 3.39% across the U.S. banking industry at the end of 2025.1Federal Deposit Insurance Corporation. FDIC Quarterly Banking Profile Fourth Quarter 2025 For most commercial banks, lending generates the majority of income, and it channels money from people who have it to households and businesses that need it to buy homes, expand operations, or cover short-term cash gaps.
The mechanics are simple in outline. If a bank pays depositors an average of 2% and earns 5.4% on its loans, the margin is roughly 3.4%. That spread has to cover operating costs, absorb loan losses, and still leave a profit. Everything else in bank lending — how funds get raised, how borrowers get evaluated, how rates get priced, how regulators cap risk — flows from that basic arithmetic.
How Banks Fund the Loans They Make
Customer deposits are a bank’s cheapest and most stable source of money. Checking accounts, savings accounts, and certificates of deposit are all money the bank owes back to depositors but can deploy as loans in the meantime. On the balance sheet, deposits sit as liabilities and loans sit as assets. Banking is, at its core, the business of turning short-term liabilities into longer-term assets.
Deposits alone don’t always cover demand for loans. Banks supplement their funding through wholesale markets, including advances from the Federal Home Loan Bank system, which provides short- and long-term loans to member institutions at competitive rates.2Federal Housing Finance Agency. About FHLBank System The FHLB system taps the debt markets multiple times a day to supply this funding.3Federal Deposit Insurance Corporation. Affordable Mortgage Lending Guide – Advances Banks can also issue commercial paper or borrow from other banks in the federal funds market.
The secondary market is another major source of lending capacity. Fannie Mae and Freddie Mac buy qualifying mortgages from lenders, either holding them in portfolio or packaging them into mortgage-backed securities for investors. Lenders take the cash and make new loans.4Federal Housing Finance Agency. About Fannie Mae and Freddie Mac This cycle is what allows a single bank to originate far more mortgage volume than its own deposit base could ever support.
The Main Types of Bank Loans
Bank lending splits into three broad categories, each with its own risk profile and underwriting approach.
Consumer Loans
Consumer loans are credit extended to individuals for personal use. The most common products are credit cards, auto loans, and personal loans. Credit cards are revolving credit: you borrow up to a limit, repay, and borrow again. Auto loans and personal loans are installment credit with fixed repayment schedules.
Risk varies considerably. Auto loans are secured by the vehicle, which gives the bank something to repossess if payments stop. Personal loans are often unsecured. Credit card balances carry even more risk because they’re both unsecured and revolving, which is why credit card interest rates run substantially higher than auto loan rates. There is no federal cap on credit card interest rates for national banks, though most states impose their own limits.
Underwriting for consumer loans leans heavily on credit scores and debt-to-income ratios. The credit score estimates how likely you are to default; the debt-to-income ratio shows whether your earnings can absorb the new payment.
Commercial and Industrial Loans
Commercial and industrial (C&I) loans provide capital to businesses for working capital, equipment purchases, and expansion. The two most common structures are term loans and revolving lines of credit. A term loan delivers a fixed amount with a set repayment schedule, usually secured by specific business assets. A revolving line of credit lets a business draw funds up to a limit and repay as cash flow allows.
Underwriting a C&I loan means digging into the business’s financial statements. The lender wants to see whether the company generates enough cash flow to cover its debt payments, typically measured by comparing earnings before interest, taxes, depreciation, and amortization (EBITDA) against total debt service. Banks often build covenants into C&I agreements, requiring the borrower to maintain specific financial ratios throughout the life of the loan. Violating a covenant can trigger a default even if the borrower is current on payments, something business owners routinely underestimate.
Real Estate Loans
Real estate lending covers both residential mortgages and commercial real estate loans. The common thread is that the property itself serves as collateral.
For residential mortgages, a key risk metric is the loan-to-value (LTV) ratio, which compares the loan amount to the property’s appraised value. A $400,000 loan on a $500,000 home is an 80% LTV. The lower the LTV, the more equity the borrower has at stake, and the less risk the bank carries.
Commercial real estate loans finance income-producing properties like office buildings, apartment complexes, and retail centers. The underwriting focus shifts from the borrower’s personal income to the property’s ability to generate revenue. Banks evaluate net operating income against total debt payments using the debt service coverage ratio (DSCR). Many lenders require a minimum DSCR of at least 1.25, meaning the property’s annual cash flow must exceed its annual debt obligation by 25%.
How Banks Decide Who Gets a Loan
Every lending decision ultimately answers one question: will this borrower pay the money back? Banks structure that analysis around the Five Cs of Credit.
- Character: your track record of repaying debts, largely reflected in your credit score and payment history.
- Capacity: whether your income and cash flow can handle the new debt alongside existing obligations.
- Capital: how much of your own money you’re putting into the transaction. A borrower with real equity at stake is less likely to walk away.
- Collateral: assets pledged to secure the loan, giving the bank a fallback if repayment fails. The bank cares about both current value and how easily the asset could be sold.
- Conditions: the purpose of the loan and the broader economic environment. A business expansion loan during a recession gets more scrutiny than one during a boom.
These factors feed into the underwriting process. For consumer loans, much of the analysis runs through automated credit scoring models. For commercial loans, a loan officer analyzes financial statements manually, prepares a credit memorandum summarizing risks and merits, and presents it to a loan committee or authorized lending officer for a final decision.
For homebuyers, this evaluation often starts before you’ve found a property. A prequalification gives you a rough estimate based on basic financial information and a credit check. A pre-approval goes further, requiring documentation like pay stubs, tax returns, and bank statements, and produces a conditional commitment to lend a specific amount. Pre-approval letters carry far more weight with sellers because the bank has already verified your finances.
How Loan Interest Rates Are Set
The interest rate on any loan starts with the bank’s cost of funds — what it costs the bank to acquire the money being lent. On top of that base, the bank adds a risk premium reflecting the borrower’s likelihood of default, as assessed through the Five Cs. A borrower with a strong credit score, significant collateral, and stable income pays a smaller premium than one with weaker credentials.
The Federal Reserve’s benchmark rate shapes all of this. The federal funds rate, which is the rate banks charge each other for overnight loans, serves as the foundation for most lending rates. Most banks set their prime rate about three percentage points above the federal funds rate. Many consumer and business loans are then priced as “prime plus” some additional spread based on risk. As of early 2026, the federal funds rate sits in the 3.50% to 3.75% range.
Loans carry either a fixed interest rate or a floating rate tied to a benchmark index. Since the transition away from LIBOR, the standard benchmark for floating-rate loans in the U.S. is the Secured Overnight Financing Rate (SOFR), based on actual overnight borrowing transactions in the Treasury repurchase market.5Federal Reserve Bank of New York. Alternative Reference Rates Committee – SOFR Starter Kit Part II A floating-rate loan might be priced at SOFR plus 2.5%, meaning your rate moves up or down as SOFR changes. Fixed-rate loans lock in the rate for the life of the loan, providing predictability but typically starting slightly higher to compensate the bank for the interest rate risk it absorbs.
The Loan Process From Application to Closing
The lending process starts with a formal application. For consumer loans, this might be a brief online form. For commercial loans, the application package usually includes financial statements, tax returns, a business plan, and a detailed explanation of how the funds will be used.
During underwriting, the bank verifies everything. The underwriter pulls credit reports, orders appraisals of any collateral, confirms income and asset documentation, and checks the proposed loan against internal lending policies and regulatory concentration limits. For commercial loans, the underwriter prepares a credit memorandum laying out the deal’s strengths, weaknesses, and recommended terms. That memo goes to a loan committee for approval, modification, or denial.
Once approved, the loan moves to documentation and closing. Legal counsel prepares the promissory note (the borrower’s written promise to repay), security agreements covering any collateral, and personal or corporate guarantees when required. For loans secured by personal property like equipment or inventory, the bank files a UCC-1 financing statement with the appropriate state authority to establish its priority claim against other creditors. For real estate loans, the bank records a mortgage or deed of trust with the county.
After closing, the bank disburses the funds and transfers the loan to its servicing operation. Servicing handles payment collection, escrow management for taxes and insurance, and ongoing monitoring to confirm you stay in compliance with the loan terms.
Rules That Limit How Much Banks Can Lend
Banks cannot lend without limits. Regulators require them to hold a minimum cushion of capital against their loan portfolios to absorb losses without threatening depositors. Under the Basel III framework, banks must maintain Common Equity Tier 1 capital of at least 4.5% of risk-weighted assets, Tier 1 capital of at least 6%, and total capital of at least 8%.6Bank for International Settlements. Basel Framework – Calculation of Minimum Risk-Based Capital Requirements U.S. regulators expect banks to hold more than the minimums, and banks classified as “well-capitalized” need a Tier 1 ratio of at least 8%.7Congressional Research Service. Bank Capital Requirements – Basel III Endgame
The “risk-weighted” piece matters. Not all loans carry the same weight. A well-secured residential mortgage with a low LTV consumes less regulatory capital than an unsecured commercial loan. The mix of loans a bank holds directly affects how much capital it needs, and ultimately how much it can lend.
Beyond regulatory capital, banks also maintain reserves for expected loan losses under the Current Expected Credit Losses (CECL) accounting standard. CECL requires banks to estimate the losses they expect to experience over the full remaining life of every loan at the time of origination, factoring in current conditions and economic forecasts rather than waiting for a borrower to actually miss payments. These reserves reduce reported earnings upfront but protect the balance sheet when loans eventually go bad.
Your Rights as a Borrower
Several federal laws govern how banks interact with borrowers.
Truth in Lending Act
The Truth in Lending Act (TILA) requires lenders to clearly disclose the cost of credit before you sign anything. For consumer loans, the lender must tell you the annual percentage rate (APR), the total finance charge, the amount financed, and the total of all payments over the life of the loan.8Office of the Law Revision Counsel. 15 USC Chapter 41, Subchapter I – Consumer Credit Cost Disclosure The APR folds fees and other costs into a single number, making it easier to compare offers. For 2026, the disclosure requirements under Regulation Z apply to consumer credit transactions of $73,400 or less, though mortgages and private education loans are covered regardless of amount.9Federal Reserve Board. Agencies Announce Dollar Thresholds for Truth in Lending and Consumer Leasing Rules
Equal Credit Opportunity Act
The Equal Credit Opportunity Act (ECOA) prohibits lenders from discriminating against any applicant based on race, color, religion, national origin, sex, marital status, or age. A lender also cannot deny you credit because your income comes from public assistance or because you’ve exercised a right under consumer protection law.10Office of the Law Revision Counsel. 15 USC 1691 – Scope of Prohibition This doesn’t mean every applicant gets approved. It means the decision has to rest on legitimate financial factors, not personal characteristics.
Fair Credit Reporting Act
If a bank denies your application based in whole or in part on information from a credit report, the Fair Credit Reporting Act requires the bank to notify you, provide the name and contact information of the credit bureau that supplied the report, tell you your credit score, and inform you of your right to obtain a free copy of the report within 60 days.11Office of the Law Revision Counsel. 15 USC 1681m – Requirements on Users of Consumer Reports These adverse action notices are one of the most underused consumer protections in lending. They give you the information you need to spot errors on your credit report and dispute them before applying elsewhere.
Community Reinvestment Act
The Community Reinvestment Act requires banks to serve the credit needs of their entire community, including low- and moderate-income neighborhoods, consistent with safe and sound banking practices.12Office of the Comptroller of the Currency. 12 CFR Part 25 – Community Reinvestment Act Regulators evaluate each bank’s CRA performance and factor it into decisions on branch openings, mergers, and other applications.
What Happens If You Stop Paying
Missing loan payments triggers a chain of consequences that moves faster than most borrowers expect.
After a missed payment, the bank starts its collections process with notices and late fees. Most loan agreements contain an acceleration clause giving the bank the right to declare the entire remaining balance due immediately if you breach the agreement. Acceleration rarely happens automatically; the bank has to invoke the clause. If you cure the default before the bank accelerates, you can often avoid the worst outcomes. Once the bank accelerates, the full balance is due, and the bank’s options expand.
For mortgages, federal rules generally prevent a servicer from starting the legal foreclosure process until you’re at least 120 days behind on payments.13Consumer Financial Protection Bureau. How Long Will It Take Before I Face Foreclosure After that, the timeline depends on whether your state uses judicial foreclosure (through the courts) or non-judicial foreclosure (outside the courts). The full process typically runs anywhere from 5 to 24 months.
For unsecured loans and credit card debt, banks that can’t collect will eventually charge off the debt, meaning they write it off as a loss for accounting purposes. Charging off a loan does not erase your obligation. The bank can still pursue collection, sell the debt to a collection agency, or sue you. A charge-off is devastating to your credit score and stays on your credit report for seven years.
Tax on Cancelled Debt
If a bank ultimately forgives or cancels a debt, the IRS generally treats the forgiven amount as taxable income. A lender that cancels $600 or more must file Form 1099-C and send you a copy, and you’re expected to report the cancelled amount on your tax return.14Internal Revenue Service. Publication 4681 – Canceled Debts, Foreclosures, Repossessions, and Abandonments This catches many borrowers off guard: after losing a home or settling a debt for less than owed, they get a tax bill on the forgiven portion.
There are important exceptions. Debt discharged in bankruptcy is excluded from taxable income, and if you were insolvent when the debt was cancelled (your total liabilities exceeded your total assets), you can exclude the cancelled amount to the extent of that insolvency. A separate exclusion for cancelled mortgage debt on a primary residence was available through 2025, but that provision expired for discharges occurring after December 31, 2025, unless a written agreement was in place before that date.15Office of the Law Revision Counsel. 26 USC 108 – Income From Discharge of Indebtedness
When Your Loan Gets Sold to Another Bank
Banks don’t always hold every loan they originate. Selling loans frees up capital and balance sheet capacity to make new ones. The secondary mortgage market, dominated by Fannie Mae and Freddie Mac, exists specifically for this purpose.4Federal Housing Finance Agency. About Fannie Mae and Freddie Mac
When your loan is sold, the terms cannot change. Your interest rate, monthly payment, and remaining balance stay exactly the same. What changes is who you send the payment to. The original lender sometimes retains the servicing rights (collecting payments and managing escrow) even after selling the loan itself, but often the servicing transfers to a new company along with the loan.
Federal law requires both the old and new servicers to notify you when a servicing transfer happens. The outgoing servicer must send written notice at least 15 days before the transfer takes effect. The incoming servicer must notify you within 15 days after.16Office of the Law Revision Counsel. 12 USC 2605 – Servicing of Mortgage Loans and Administration of Escrow Accounts Both notices must include the effective date, contact information for each servicer, and the dates when you should stop paying the old servicer and start paying the new one. A transfer of servicing cannot alter any other term of your mortgage.