Default Rate: Definition, Causes & Formula | Fit Small Business

Default Rate: Definition, Causes & Formula

The default rate is a calculation that includes all loans issued by a lender that have been written off as unpaid by the borrower and are officially in default. Loans typically go into default after an extended period of missed payments, and they are considered to be in violation of the terms of the loan…

Mar 13, 2025
5 minute read

The default rate is a calculation that includes all loans issued by a lender that have been written off as unpaid by the borrower and are officially in default. Loans typically go into default after an extended period of missed payments, and they are considered to be in violation of the terms of the loan agreement.

Default rate formula

The following formula represents how the default rate is calculated:

Default rate  = Number of defaulted loans × 100
 Total number of loans

Default rate example

For a sample of how the above default rate formula is used, let’s say a lending institution has 15 defaulted loans and 600 total loans. To calculate the lender’s default rate, divide the 15 defaulted loans by the 600 total loans and then multiply that value by 100.

(15 ÷ 600) × 100 = 2.5

In this scenario, the resulting default rate is 2.5%.

Why the default rate matters

The default rate helps lenders or financial institutions manage and analyze risk associated with their loan portfolios. Essentially, it acts as an indicator of the likelihood of borrowers failing to make payments on their loans, which directly affects the lender’s financial position and well-being.

If a lending institution finds that it has a high default rate, it should take a closer look at its lending portfolio and review its lending procedures. In this case, the higher the default rate, the higher the risk associated with lending to borrowers. The risk of major losses can be mitigated by lenders who act to lower their loan default rate and protect themselves from lending transactions and borrowers that may be considered high risk.

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How a loan goes into default and what happens after it does

Loans typically enter into default after an extended period of missed payments, typically 270 days or more. A borrower who defaults on their loan is likely to see an impact on their business credit score since lenders may report any delinquencies and may be especially affected in the event of default. This may also impact a borrower’s ability to obtain financing in the future.

It’s common for a lender to transfer the defaulted account to a third-party debt collection agency to recoup losses. If payments cannot be collected, the lender writes them off as a loss and removes them from its books.

Causes of loan default and high default rates

High default rates are incurred if borrowers are commonly entering into default with their loans. Borrowers are responsible for making timely payments in accordance with the terms and conditions of their financing agreement. If they have a delinquent loan and enter into default, the risk of the lender taking a loss increases greatly.

Below are some common examples of how loan default may take place, which can ultimately impact default rates.

Cause of defaultSampleWhat it is
Lack of creditworthiness and risky borrowersPoor credit historyBorrowers with past defaults or low credit scores are more likely to default again.
Lack of financial literacyMisunderstanding loan terms or risks can lead to repayment issues.
Fraud and misuse of fundsMisrepresenting finances or misusing loans increases default risks.
Poor financial managementOverleveragingBorrowing beyond one’s ability to repay leads to financial distress.
Inadequate cash flowInconsistent or negative cash flow makes timely debt payments difficult.
Lack of savings or emergency fundsUnexpected expenses cause financial strain and increase default likelihood.
High interest rates and unfavorable loan termsRising interest ratesIncreased borrowing costs make loans harder to repay.
Predatory lending practicesHidden fees or unreasonable terms can lead to defaults.
Short loan termsLarge repayment obligations in a short period can be unsustainable.
Economic factorsRecession or economic downturnsSlower economic activity reduces income and ability to repay debts.
High inflationRising costs strain finances, making debt payments harder.
UnemploymentJob losses reduce personal and business income, increasing default risk.
Business and industry challengesMarket changes and competitionBusinesses failing to adapt may lose revenue and default on loans.
Supply chain disruptionsDelays in goods and services impact revenue and cash flow.
Seasonal fluctuationsIndustries with seasonal income struggle with consistent loan repayments.
External crises and unforeseen eventsNatural disastersHurricanes, floods, or fires can disrupt finances and repayment ability.
Political and regulatory changesNew laws or restrictions can impact business profitability and cash flow.
Pandemics and health crisesUnexpected crises (e.g., COVID-19) cause widespread financial struggles.

How to prevent high default rates

Common actions a lender can take include the following:

  • Conducting credit checks and other risk assessments
  • Considering economic and industry condition
  • Enacting the collection of collateral or other securities
  • Extending debt management services
  • Maintaining compliance with lending regulations
  • Offering flexible repayment options
  • Providing loan modifications

Frequently asked questions (FAQs)

The default rate is the percentage of loans that a lender has written off of its books based on lending transactions that are considered to be uncollectable.

A default interest rate is a higher rate of interest applied to a loan if a borrower misses payments. It is typically applied as a penalty for not making payments in a timely manner and allows the lender to make up some of its losses and further mitigate risk.

To calculate the default rate, the formula is to divide the total number of loans in default by the total number of loans, and then multiply that quotient by 100.

What constitutes a good default rate can vary widely based on the type of debt involved. That said, the lower the default rate, the better, as it represents fewer events of loan default and an overall better financial position for a lender.

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Bottom line

Knowing what the default rate is and what it means can help you understand the risks associated with issuing financing and why financial institutions may have certain qualification requirements or stipulations involved when seeking financing.

Lauren McKinley

Lauren McKinley is a Staff Writer at Fit Small Business, specializing in Finance. She’s a financial professional with over 4 years of diverse experience in the banking industry, primarily in the Northeast. Her expertise spans roles as a Credit Analyst, Loan Administrator, and Bank Teller, obtaining skills in commercial real estate, financial analysis, and banking operations. With a particular focus in small business financing, she has navigated financial solutions for a variety of lending institutions.

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