Loan fundamentals and the mortgage market

A buyer can purchase a $500,000 home with $100,000 of personal funds and a $400,000 loan, before closing costs. The price is $500,000, the initial debt is $400,000, and the initial equity contribution is $100,000. Financing changes the source of purchase funds; it does not reduce the property's price or eliminate the borrower's obligation.

The lender evaluates both the borrower and the collateral. A valuable building does not prove that the borrower can make payments. A strong salary does not establish that the property has acceptable title, condition, or value. Underwriting brings these separate questions together through documentation, appraisal or permitted valuation methods, credit evaluation, and program requirements.

Security gives the lender rights against identified property if the obligation is not performed. It is distinct from the note documenting the debt. A borrower may remain obligated under a note even when the property's value falls, subject to California's particular anti-deficiency protections and other law. The changing market value does not automatically rewrite the loan balance.

Simple annual interest is principal multiplied by the annual rate. A $300,000 balance at 6 percent generates $18,000 of annual interest at that unchanged balance, or $1,500 for a month using an annual-rate-divided-by-12 convention. Actual loan documents can specify particular accrual and day-count methods. Use the convention given in an exam problem.

An amortizing payment includes interest and principal reduction. Suppose the scheduled payment is $1,800 and the first month's interest is $1,500. The remaining $300 reduces principal, leaving $299,700. If the rate and payment remain unchanged, the next month's interest is slightly smaller and the principal portion slightly larger. The payment can be level while its composition changes.

Fully amortized means scheduled payments retire the balance by maturity. Partially amortized means a balance remains due at maturity, often as a balloon. Interest-only means payments cover interest during the stated period without reducing principal. Negative amortization occurs when the payment does not cover accrued interest and unpaid interest is added to the balance. Making every scheduled payment does not guarantee that debt is shrinking.

Loan-to-value, or LTV, is the loan divided by the applicable property value. For purchase underwriting, lenders commonly use the lower of purchase price or appraised value under the program's rules. A $400,000 loan against a $500,000 value has 80 percent LTV. If that purchase appraises at $480,000 and the lender applies an 80 percent limit to that value, the maximum loan is $384,000. The buyer must address the resulting financing gap through permitted arrangements.

Combined LTV considers multiple loans against the property. A $360,000 first loan plus a $40,000 second loan on a $500,000 property produces 80 percent combined LTV, even though the first loan alone is 72 percent. A second loan does not disappear from risk analysis merely because a different lender makes it.

Debt-to-income, or DTI, compares monthly obligations with qualifying gross monthly income. A housing ratio focuses on housing expenses; a total ratio includes housing plus relevant recurring debts. With $8,000 gross monthly income, $2,400 qualifying housing expense, and $800 other monthly debt, the housing ratio is 30 percent and total DTI is 40 percent. Program limits vary. Do not memorize a single ratio as the universal legal limit for every mortgage.

Principal and interest are only part of homeownership cost. PITI adds property taxes and insurance, while total housing obligations may also include mortgage insurance, association dues, assessments, and other items. An impound account collects money for bills such as taxes and insurance. It is not an extra principal repayment, and having no impound account does not mean those bills are waived.

A fixed interest rate stabilizes the rate, not every component of the total monthly bill. Taxes and insurance can change. A quoted payment excluding those expenses should not be compared as though it were the same measure as a payment that includes them.

One point equals 1 percent of the loan amount. Two points on a $400,000 loan cost $8,000, not 2 percent of the property price. Discount points commonly exchange greater upfront cost for a lower rate, while other origination charges compensate services. The exact rate reduction obtained for a point depends on the offered pricing; there is no universal one-point-to-one-percent-rate conversion.

APR expresses specified borrowing costs as an annualized rate and supports comparison with appropriate assumptions. It is not simply the note rate plus the number of points, and it is not the amount used to compute every monthly interest charge. Some expenses are not included in the finance charge. Compare APR alongside rate, loan term, costs, and how long the borrower expects to keep the loan.

Suppose an investor pays $100,000 cash toward a $500,000 property and borrows $400,000. Ignoring selling costs, principal repayment, taxes, and operating results, a rise to $550,000 increases equity from $100,000 to $150,000. A 10 percent property-value increase produces a 50 percent gain on initial equity.

The same leverage amplifies losses. A fall to $450,000 leaves $50,000 of equity under those assumptions, a 50 percent reduction. Leverage is not inherently profit. Borrowing also creates payment obligations that continue during vacancy or declining income. A loan that makes acquisition possible can still be unsuitable if cash flow and reserves are inadequate.

The primary mortgage market is where borrowers obtain newly originated loans from lenders. Sources include banks, credit unions, mortgage banking companies, private lenders, and sellers providing carryback financing. Institutions may keep loans in portfolio or sell them. A mortgage broker commonly arranges credit between borrower and lender rather than funding every loan from the broker's own capital.

The secondary market trades existing loans or interests backed by loans. Sales can replenish lenders' funds and spread risk among investors. Fannie Mae and Freddie Mac purchase eligible mortgages and support mortgage-backed securities. Their underwriting standards influence what originating lenders offer, even when the consumer never applies directly to either organization.

Ginnie Mae guarantees timely payment on qualifying mortgage-backed securities backed by government-insured or guaranteed loans through approved issuers. It does not perform the same role as FHA insurance on an individual mortgage, nor is it the ordinary lender receiving a buyer's application. Distinguish the loan originator, insurer or guarantor, security issuer, investor, and servicer.

Servicing means collecting payments, administering relevant accounts, and handling ongoing loan operations. The servicer can change without changing the borrower's contractual interest rate. Ownership of the loan and responsibility for servicing can be held by different entities. A borrower should follow valid transfer notices and verify suspicious payment redirection independently.

Two lenders offer the same loan amount and term. One charges $4,000 more upfront but reduces the monthly payment by $100. A simplified cash break-even is 40 months: $4,000 divided by $100. This calculation ignores time value, taxes, different amortization, and other costs, so it is a screening tool rather than a complete financial analysis.

For exam purposes, first determine what is being compared. LTV measures collateral leverage, DTI measures payment burden relative to income, and a point measures an upfront charge. Choosing the correct denominator often resolves the problem before any arithmetic begins.

A buyer agrees to pay $600,000 and expects an 80 percent purchase loan, leaving a $120,000 down payment before closing costs. The appraisal is $560,000. If the lender applies its 80 percent limit to the lower appraised value, the maximum loan is $448,000. At the unchanged price, the buyer must supply $152,000 before costs, an additional $32,000 beyond the original plan. The difference is not the entire $40,000 appraisal shortfall because the planned loan covered 80 percent, not 100 percent, of value.

The buyer might negotiate a price change, supply additional permitted funds, investigate another compliant structure, or exercise a contractual right if available. None of those outcomes is automatic. A financing contingency concerns contractual rights, while underwriting determines what the lender will fund. An agent should not tell the buyer that the lender must honor the original amount merely because the purchase agreement is signed.

If another permitted loan fills the gap, combined leverage and payments still change. A junior loan may reduce the immediate cash requirement but increase CLTV, monthly obligations, and the claims paid at sale. Treating the new loan as a gift would distort both qualification and equity.

Use an illustrative $200,000 balance at 6 percent annual interest with a $1,300 monthly principal-and-interest payment and the monthly-rate convention. First-month interest is $1,000, so $300 reduces principal to $199,700. Next-month interest is $998.50, leaving $301.50 for principal and a new balance of $199,398.50. The payment stays the same while principal reduction accelerates gradually because interest is calculated on a smaller balance.

Change the payment to $900 while interest still accrues at $1,000 for the first month, and assume the loan terms capitalize unpaid interest. The $100 shortfall increases the balance to $200,100. A payment receipt is not evidence of amortization; compare the payment with accrued interest. A payment cap can therefore have very different consequences from an interest-rate cap.

Extra principal payments can reduce the future interest base, but they do not necessarily reduce the next scheduled payment. The note and servicer's rules determine whether a recast or other adjustment is available. Distinguish lowering the balance, shortening the payoff period, and changing the required payment instead of assuming they always occur together.

Loan A requires $6,000 more upfront than Loan B and reduces the monthly payment by $150. The simple break-even is 40 months. A borrower expecting to sell in 24 months would save only $3,600 in payments during that assumed period, less than the extra upfront amount. That arithmetic does not predict when the borrower will actually sell or capture differences in remaining principal, taxes, investment returns, or other charges.

A lender credit can reverse the tradeoff by reducing upfront cash in exchange for different pricing, often a higher rate. No-closing-cost language should be examined to determine whether costs are paid through pricing, added to the loan, or otherwise borne elsewhere. A cost does not disappear because the borrower does not write a separate check for it at closing.

Use the same loan amount, term, and payment definition when comparing offers. Principal-and-interest on one offer cannot be compared directly with principal, interest, taxes, insurance, and mortgage insurance on another. APR helps compare specified credit costs, but different holding periods and repayment structures still require judgment. The lowest initial cash requirement is not automatically the lowest lifetime cost.

A borrower with substantial equity can still struggle to meet monthly payments. Another borrower with strong income can have little equity and expose the lender to a loss if property value falls. LTV and DTI therefore answer different questions rather than competing to be the single best ratio. Reserves provide another kind of protection by supporting payments through temporary disruptions.

Finally, follow the functions when a loan changes hands. Selling the note in the secondary market transfers an investment interest; transferring servicing changes who administers payments. Either can occur without rewriting the contractual note rate. A notice naming a new servicer should be verified and followed appropriately, not interpreted as a demand to renegotiate the mortgage.

• Interest and principal are separate parts of an amortizing payment.
• LTV uses property value; DTI uses qualifying income; points use loan amount.
• APR is a cost measure, not the note's periodic interest calculation.
• Leverage can magnify losses as well as gains.
• Origination, secondary-market investment, and servicing are distinct functions.