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Debt is an obligation that requires one party, the debtor, to pay money or other agreed-upon value to another party, the creditor. Debt is a deferred payment, or series of payments, which differentiates it from an immediate purchase. The debt may be owed by sovereign state or country, local government, company, or an individual. Commercial debt is generally subject to contractual terms regarding the amount and timing of repayments of principal and interest.  Loans, bonds, notes, and mortgages are all types of debt. In financial accounting, debt is a type of financial transaction, as distinct from equity.
The term can also be used metaphorically to cover moral obligations and other interactions not based on a monetary value.  For example, in Western cultures, a person who has been helped by a second person is sometimes said to owe a "debt of gratitude" to the second person.
The English term "debt" was first used in the late 13th century.  The term "debt" comes from "dette, from Old French dete, from Latin debitum "thing owed," neuter past participle of debere "to owe," originally, "keep something away from someone," from de- "away" (see de-) + habere "to have" (see habit (n.)). Restored spelling [was used] after c. 1400.  The related term "debtor" was first used in English also in the early 13th century; the terms "dettur, dettour, [came] from Old French detour, from Latin debitor "a debter," from past participle stem of debere;...The -b- was restored in later French, and in English c. 1560-c. 1660." In the King James Bible, only one spelling, "debtor", is used.
Principal is the amount of money originally invested or loaned, on which basis interest and returns are calculated. 
There are three main ways repayment may be structured: the entire principal balance may be due at the maturity of the loan; the entire principal balance may be amortized over the term of the loan; or the loan may be partially amortized during its term, with the remaining principal due as a "balloon payment" at maturity. Amortization structures are common in mortgages and credit cards.
Debtors of every type default on their debt from time to time, with various consequences depending on the terms of the debt and the law governing default in the relevant jurisdiction. If the debt was secured by specific collateral, such as a car or home, the creditor may seek to repossess the collateral. In more serious circumstances, individuals and companies may go into bankruptcy.
Common types of debt owed by individuals and households include mortgage loans, car loans, credit card debt, and income taxes. For individuals, debt is a means of using anticipated income and future purchasing power in the present before it has actually been earned. Commonly, people in industrialized nations use consumer debt to purchase houses, cars and other things too expensive to buy with cash on hand.
People are more likely to spend more and get into debt when they use credit cards vs. cash for buying products and services.      This is primarily because of the transparency effect and consumer's "pain of paying."   The transparency effect refers to the fact that the further you are from cash (as in a credit card or another form of payment), the less transparent it is and the less you remember how much you spent.  The less transparent or further away from cash, the form of payment employed is, the less an individual feels the “pain of paying” and thus is likely to spend more.  Furthermore, the differing physical appearance/form that credit cards have from cash may cause them to be viewed as “monopoly” money vs. real money, luring individuals to spend more money than they would if they only had cash available.  
Besides these more formal debts, private individuals also lend informally to other people, mostly relatives or friends. One reason for such informal debts is that many people, in particular those who are poor, have no access to affordable credit. Such debts can cause problems when they are not paid back according to expectations of the lending household. In 2011, 8 percent of people in the European Union reported their households has been in arrears, that is, unable to pay as scheduled "payments related to informal loans from friends or relatives not living in your household". 
A company may use various kinds of debt to finance its operations as a part of its overall corporate finance strategy.
A term loan is the simplest form of corporate debt. It consists of an agreement to lend a fixed amount of money, called the principal sum or principal, for a fixed period of time, with this amount to be repaid by a certain date. In commercial loans interest, calculated as a percentage of the principal sum per year, will also have to be paid by that date, or may be paid periodically in the interval, such as annually or monthly. Such loans are also colloquially called "bullet loans", particularly if there is only a single payment at the end – the "bullet" – without a "stream" of interest payments during the life of the loan.
A revenue-based financing loan comes with a fixed repayment target that is reached over a period of several years. This type of loan generally comes with a repayment amount of 1.5 to 2.5 times the principle loan. Repayment periods are flexible; businesses can pay back the agreed-upon amount sooner, if possible, or later. In addition, business owners do not sell equity or relinquish control when using revenue-based financing. Lenders that provide revenue-based financing work more closely with businesses than bank lenders, but take a more hands-off approach than private equity investors. 
A syndicated loan is a loan that is granted to companies that wish to borrow more money than any single lender is prepared to risk in a single loan. A syndicated loan is provided by a group of lenders and is structured, arranged, and administered by one or several commercial banks or investment banks known as arrangers. Loan syndication is a risk management tool that allows the lead banks underwriting the debt to reduce their risk and free up lending capacity.
A company may also issue bonds, which are debt securities. Bonds have a fixed lifetime, usually a number of years; with long-term bonds, lasting over 30 years, being less common. At the end of the bond's life the money should be repaid in full. Interest may be added to the end payment, or can be paid in regular installments (known as coupons) during the life of the bond.
A letter of credit or LC can also be the source of payment for a transaction, meaning that redeeming the letter of credit will pay an exporter. Letters of credit are used primarily in international trade transactions of significant value, for deals between a supplier in one country and a customer in another. They are also used in the land development process to ensure that approved public facilities (streets, sidewalks, stormwater ponds, etc.) will be built. The parties to a letter of credit are usually a beneficiary  who is to receive the money, the issuing bank of whom the applicant is a client, and the advising bank of whom the beneficiary is a client. Almost all letters of credit are irrevocable, i.e., cannot be amended or canceled without prior agreement of the beneficiary, the issuing bank and the confirming bank, if any. In executing a transaction, letters of credit incorporate functions common to giros and traveler's cheque. Typically, the documents a beneficiary has to present in order to receive payment include a commercial invoice, bill of lading, and a document proving the shipment was insured against loss or damage in transit. However, the list and form of documents is open to imagination and negotiation and might contain requirements to present documents issued by a neutral third party evidencing the quality of the goods shipped, or their place of origin.
Companies also use debt in many ways for capital expenditures and other business investments made in their assets, "leveraging" the return on their equity. This leverage, the proportion of debt to equity, is considered important in determining the riskiness of an investment; the more debt per equity, the riskier.
Governments issue debt to pay for ongoing expenses as well as major capital projects. Government debt may be issued by sovereign states as well as by local governments, sometimes known as municipalities.
Debt issued by the government of the United States, called Treasuries, serves as a reference point for all other debt. There are deep, transparent, liquid, and open capital markets for Treasuries.  Furthermore, Treasuries are issued in a wide variety of maturities, from one day to thirty years, which facilitates comparing the interest rates on other debt to a security of comparable maturity. In finance, the theoretical "risk-free interest rate" is often approximated by practitioners by using the current yield a Treasury of the same duration.
The overall level of indebtedness by a government is typically shown as a ratio of debt-to-GDP. This ratio helps to assess the speed of changes in government indebtedness and the size of the debt due.
The United Nations Sustainable Development Goal 17, an integral part of the 2030 Agenda has a target to address the external debt of highly indebted poor countries to reduce debt distress. 
Municipal bonds (or muni bonds) are typical debt obligations, for which the conditions are defined unilaterally by the issuing municipality (local government), but it is a slower process to accumulate the necessary amount. Usually, debt or bond financing will not be used to finance current operating expenditures, the purposes of these amounts are local developments, capital investments, constructions, own contribution to other credits or grants. 
The debt service coverage ratio is the ratio of income available to the amount of debt service due (including both interest and principal amortization, if any). The higher the debt service coverage ratio, the more income is available to pay debt service, and the easier and lower-cost it will be for a borrower to obtain financing.
Different debt markets have somewhat different conventions in terminology and calculations for income-related metrics. For example, in mortgage lending in the United States, a debt-to-income ratio typically includes the cost of mortgage payments as well as insurance and property tax, divided by a consumer's monthly income. A "front-end ratio" of 28% or below, together with a "back-end ratio" (including required payments on non-housing debt as well) of 36% or below is also required to be eligible for a conforming loan.
The loan-to-value ratio is the ratio of the total amount of the loan to the total value of the collateral securing the loan.
For example, in mortgage lending in the United States, the loan-to-value concept is most commonly expressed as a "down payment." A 20% down payment is equivalent to an 80% loan to value. With home purchases, value may be assessed using the agreed-upon purchase price, and/or an appraisal.
A debt obligation is considered secured if creditors have recourse to specific collateral. Collateral may include claims on tax receipts (in the case of a government), specific assets (in the case of a company) or a home (in the case of a consumer). Unsecured debt comprises financial obligations for which creditors do not have recourse to the assets of the borrower to satisfy their claims.
Credit bureaus collect information about the borrowing and repayment history of consumers. Lenders, such as banks and credit card companies, use credit scores to evaluate the potential risk posed by lending money to consumers. In the United States, the primary credit bureaus are Equifax, Experian, and TransUnion.
Debts owed by governments and private corporations may be rated by rating agencies, such as Moody's, Standard & Poor's, Fitch Ratings, and A. M. Best. The government or company itself will also be given its own separate rating. These agencies assess the ability of the debtor to honor his obligations and accordingly give him or her a credit rating. Moody's uses the letters Aaa Aa A Baa Ba B Caa Ca C, where ratings Aa-Caa are qualified by numbers 1-3. S&P and other rating agencies have slightly different systems using capital letters and +/- qualifiers. Thus a government or corporation with a high rating would have Aaa rating.
A change in ratings can strongly affect a company, since its cost of refinancing depends on its creditworthiness. Bonds below Baa/BBB (Moody's/S&P) are considered junk or high-risk bonds. Their high risk of default (approximately 1.6 percent for Ba) is compensated by higher interest payments. Bad Debt is a loan that can not (partially or fully) be repaid by the debtor. The debtor is said to default on their debt. These types of debt are frequently repackaged and sold below face value. Buying junk bonds is seen as a risky but potentially profitable investment.
Bonds are debt securities, tradeable on a bond market. A country's regulatory structure determines what qualifies as a security. For example, in North America, each security is uniquely identified by a CUSIP for trading and settlement purposes. In contrast, loans are not securities and do not have CUSIPs (or the equivalent). Loans may be sold or acquired in certain circumstances, as when a bank syndicates a loan.
Loans can be turned into securities through the securitization process. In a securitization, a company sells a pool of assets to a securitization trust, and the securitization trust finances its purchase of the assets by selling securities to the market. For example, a trust may own a pool of home mortgages, and be financed by residential mortgage-backed securities. In this case, the asset-backed trust is a debt issuer of residential mortgage-backed securities.
Central banks, such as the U.S. Federal Reserve System, play a key role in the debt markets. Debt is normally denominated in a particular currency, and so changes in the valuation of that currency can change the effective size of the debt. This can happen due to inflation or deflation, so it can happen even though the borrower and the lender are using the same currency.
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Some argue against debt as an instrument and institution, on a personal, family, social, corporate and governmental level. Some Islamic banking forbids lending with interest even today. In hard times, the cost of servicing debt can grow beyond the debtor's ability to pay, due to either external events (income loss) or internal difficulties (poor management of resources).
Debt with an associated interest rate will increase through time if it is not repaid faster than it grows through interest. This effect may be termed usury, while the term "usury" in other contexts refers only to an excessive rate of interest, in excess of a reasonable profit for the risk accepted.
In international legal thought, odious debt is debt that is incurred by a regime for purposes that do not serve the interest of the state. Such debts are thus considered by this doctrine to be personal debts of the regime that incurred them and not debts of the state. International Third World debt has reached the scale that many economists [ who? ] are convinced that debt relief or debt cancellation is the only way to restore global equity in relations with the developing nations.[ citation needed ]
Excessive debt accumulation[ clarification needed ] has been blamed for exacerbating economic problems[ by whom? ]. For example, before the Great Depression, the debt-to-GDP ratio was very high.[ citation needed ] Economic agents were heavily indebted.[ clarification needed ] This excess of debt, equivalent to excessive expectations on future returns, accompanied asset bubbles on the stock markets. When expectations corrected, deflation and a credit crunch followed. Deflation effectively made debt more expensive and, as Fisher explained, this reinforced deflation again, because, in order to reduce their debt level, economic agents reduced their consumption and investment. The reduction in demand reduced business activity and caused further unemployment. In a more direct sense, more bankruptcies also occurred due both to increased debt cost caused by deflation and the reduced demand.
At the household level, debts can also have detrimental effects — particularly when households make spending decisions assuming income will increase, or remain stable, in years to come. When households take on credit based on this assumption, life events can easily change indebtedness into over-indebtedness. Such life events include unexpected unemployment, relationship break-up, leaving the parental home, business failure, illness, or home repairs. Over-indebtedness has severe social consequences, such as financial hardship, poor physical and mental health,  family stress, stigma, difficulty obtaining employment, exclusion from basic financial services (European Commission, 2009), work accidents and industrial disease, a strain on social relations (Carpentier and Van den Bosch, 2008), absenteeism at work and lack of organisational commitment (Kim et al., 2003), feeling of insecurity, and relational tensions. 
Global debt underwriting grew 4.3 percent year-over-year to US$5.19 trillion during 2004.[ citation needed ]
According to historian Paul Johnson, the lending of "food money" was commonplace in Middle Eastern civilizations as early as 5000 BC.[ citation needed ]
Religions like Judaism and Christianity for example, demand that debt be forgiven on a regular basis, in order to prevent systemic inequities between groups in society, or anyone becoming a specialist in holding debt and coercing repayment. An example is the Biblical Jubilee year, described in the Book of Leviticus.  Similarly, in Deuteronomy chapter 15 and verse 1 states that debts be forgiven after seven years.  This is because biblically debt is seen as the responsibility of both the creditor and the debtor. Traditional Christian teaching holds that a lifestyle of debt should not be normative; the Emmanuel Association, a Methodist denomination in the conservative holiness movement, for example, teaches: "We are to refrain from entering into debt when we have no reasonable plan to pay. We are to be careful to meet all financial engagements promptly when due, if at all possible, remembering that we are to 'Provide things honest in the sight of all men' and to 'owe no man any thing, but to love one another' (Romans 12:17; 13:8)." 
In corporate finance, a debenture is a medium- to long-term debt instrument used by large companies to borrow money, at a fixed rate of interest. The legal term "debenture" originally referred to a document that either creates a debt or acknowledges it, but in some countries the term is now used interchangeably with bond, loan stock or note. A debenture is thus like a certificate of loan or a loan bond evidencing the company's liability to pay a specified amount with interest. Although the money raised by the debentures becomes a part of the company's capital structure, it does not become share capital. Senior debentures get paid before subordinate debentures, and there are varying rates of risk and payoff for these categories.
In finance, a loan is the lending of money by one or more individuals, organizations, or other entities to other individuals, organizations, etc. The recipient incurs a debt and is usually liable to pay interest on that debt until it is repaid, as well as to repay the principal amount borrowed.
Debt consolidation is a form of debt refinancing that entails taking out one loan to pay off many others. This commonly refers to a personal finance process of individuals addressing high consumer debt, but occasionally it can also refer to a country's fiscal approach to consolidate corporate debt or government debt. The process can secure a lower overall interest rate to the entire debt load and provide the convenience of servicing only one loan or debt.
Credit risk is the possibility of losing a lender holds due to a risk of default on a debt that may arise from a borrower failing to make required payments. In the first resort, the risk is that of the lender and includes lost principal and interest, disruption to cash flows, and increased collection costs. The loss may be complete or partial. In an efficient market, higher levels of credit risk will be associated with higher borrowing costs. Because of this, measures of borrowing costs such as yield spreads can be used to infer credit risk levels based on assessments by market participants.
Fixed income refers to any type of investment under which the borrower or issuer is obliged to make payments of a fixed amount on a fixed schedule. For example, the borrower may have to pay interest at a fixed rate once a year and repay the principal amount on maturity. Fixed-income securities — more commonly known as bonds — can be contrasted with equity securities – often referred to as stocks and shares – that create no obligation to pay dividends or any other form of income. Bonds carry a level of legal protections for investors that equity securities do not — in the event of a bankruptcy, bond holders would be repaid after liquidation of assets, whereas shareholders with stock often receive nothing.
A home equity line of credit, or HELOC, is a revolving type of secured loan in which the lender agrees to lend a maximum amount within an agreed period, where the collateral is the borrower's property. Because a home often is a consumer's most valuable asset, many homeowners use their HELOC for major purchases or projects, such as home improvements, education, property investment or medical bills, and choose not to use them for day-to-day expenses.
A mortgage-backed security (MBS) is a type of asset-backed security which is secured by a mortgage or collection of mortgages. The mortgages are aggregated and sold to a group of individuals that securitizes, or packages, the loans together into a security that investors can buy. Bonds securitizing mortgages are usually treated as a separate class, termed residential; another class is commercial, depending on whether the underlying asset is mortgages owned by borrowers or assets for commercial purposes ranging from office space to multi-dwelling buildings.
Structured finance is a sector of finance — specifically financial law — that manages leverage and risk. Strategies may involve legal and corporate restructuring, off balance sheet accounting, or the use of financial instruments.
A collateralized debt obligation (CDO) is a type of structured asset-backed security (ABS). Originally developed as instruments for the corporate debt markets, after 2002 CDOs became vehicles for refinancing mortgage-backed securities (MBS). Like other private label securities backed by assets, a CDO can be thought of as a promise to pay investors in a prescribed sequence, based on the cash flow the CDO collects from the pool of bonds or other assets it owns. Distinctively, CDO credit risk is typically assessed based on a probability of default (PD) derived from ratings on those bonds or assets.
Debt level is a measure of how much debt is outstanding. Debt flow is a measure of debt level changes over time. Both are basic macroeconomic variables. Debt is used to finance household consumptions, businesses, and government spendings. Within mainstream economics, the levels and flows of public debt are seen as a larger cause of concern than those associated with private debt.
An asset-backed security (ABS) is a security whose income payments, and hence value, are derived from and collateralized by a specified pool of underlying assets.
Second mortgages, commonly referred to as junior liens, are loans secured by a property in addition to the primary mortgage. Depending on the time at which the second mortgage is originated, the loan can be structured as either a standalone second mortgage or piggyback second mortgage. Whilst a standalone second mortgage is opened subsequent to the primary loan, those with a piggyback loan structure are originated simultaneously with the primary mortgage. With regard to the method in which funds are withdrawn, second mortgages can be arranged as home equity loans or home equity lines of credit. Home equity loans are granted for the full amount at the time of loan origination in contrast to home equity lines of credit which permit the homeowner access to a predetermined amount which is repaid during the repayment period.
Credit is the trust which allows one party to provide money or resources to another party wherein the second party does not reimburse the first party immediately, but promises either to repay or return those resources at a later date. The resources provided by the first party can be either property, fulfillment of promises, or performances. In other words, credit is a method of making reciprocity formal, legally enforceable, and extensible to a large group of unrelated people.
A shared appreciation mortgage or SAM is a mortgage in which the lender agrees to receive some or all of the repayment in the form of a share of the increase in value of the property.
A commercial mortgage is a mortgage loan secured by commercial property, such as an office building, shopping center, industrial warehouse, or apartment complex. The proceeds from a commercial mortgage are typically used to acquire, refinance, or redevelop commercial property.
A line of credit is a credit facility extended by a bank or other financial institution to a government, business or individual customer that enables the customer to draw on the facility when the customer needs funds. An amount of credit that a financial institution makes available to a business or consumer during a specified period of time.
A mortgage loan or simply mortgage, in civil law jurisdicions known also as a hypothec loan, is a loan used either by purchasers of real property to raise funds to buy real estate, or by existing property owners to raise funds for any purpose while putting a lien on the property being mortgaged. The loan is "secured" on the borrower's property through a process known as mortgage origination. This means that a legal mechanism is put into place which allows the lender to take possession and sell the secured property to pay off the loan in the event the borrower defaults on the loan or otherwise fails to abide by its terms. The word mortgage is derived from a Law French term used in Britain in the Middle Ages meaning "death pledge" and refers to the pledge ending (dying) when either the obligation is fulfilled or the property is taken through foreclosure. A mortgage can also be described as "a borrower giving consideration in the form of a collateral for a benefit (loan)".
This article provides background information regarding the subprime mortgage crisis. It discusses subprime lending, foreclosures, risk types, and mechanisms through which various entities involved were affected by the crisis.
Securitization is the financial practice of pooling various types of contractual debt such as residential mortgages, commercial mortgages, auto loans or credit card debt obligations and selling their related cash flows to third party investors as securities, which may be described as bonds, pass-through securities, or collateralized debt obligations (CDOs). Investors are repaid from the principal and interest cash flows collected from the underlying debt and redistributed through the capital structure of the new financing. Securities backed by mortgage receivables are called mortgage-backed securities (MBS), while those backed by other types of receivables are asset-backed securities (ABS).
The mortgage industry of the United States is a major financial sector. The federal government created several programs, or government sponsored entities, to foster mortgage lending, construction and encourage home ownership. These programs include the Government National Mortgage Association, the Federal National Mortgage Association and the Federal Home Loan Mortgage Corporation.