The "processing" of a loan is merely an
attempt to verify the numbers that go into the numerator and denominator of the
above 3 ratios.
The most important ratio to understand when
making income property loans is
the Debt Service Coverage Ratio (DSCR). It is defined as:
DSCR = Net Operating Income (NOI) / Total Debt Service (mortgage payment(s)
Net Operating Income is the income from a rental property after deducting for
real estate taxes, fire insurance, repairs, and all other operating expenses;
and Debt Service is the mortgage payment on the property (principal and interest
of ALL Loans, not just the first mortgage). Most lenders insist
that this ratio exceed 1.0. A debt service coverage ratio of less than 1.0 would
mean that the property did not produce enough net rental income for the owner to
make the mortgage payments without supplementing the property from his personal
budget.
Obviously the higher the DSCR, the more net operating income is available to
service the debt. The Lender wants as
high a DSCR as possible.
The borrower, on the other hand, wants as large a loan as possible. The
larger the loan, the higher the debt service (mortgage payments). If the net
operating income stays the same, and the loan size and therefore the debt
service increases, then the lower the DSCR will be.
Life insurance companies are very conservative and generally require a 1.25
or 1.35 DSCR. This means that their loantovalue ratios are low. Savings and
loans (S&L's) generally only require a 1.20 DSCR, and sometimes will accept
a DSCR as low as 1.10.
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The loantovalue (LTV) ratio is probably the most
important of the 3 underwriting ratios.
The loantovalue ratio is defined as:
LTV Ratio = Total Loan Balances (1st mtg+2nd mtg +3rd mtg) / Fair Market Value
of the Property
If the borrower is only applying for a
first mortgage, and there will be no other loans on the property, then the
beginning balance of the new loan requested should be inserted in the numerator.
However, if the borrower is applying for a second mortgage, then the
"underwriter" (the person who determines whether or not the loan
qualifies) should insert the sum of the first and second mortgages in the
numerator. Similarly, if the borrower is applying for a third mortgage, then
the underwriter should insert the sum of the first, second and third mortgages
into the numerator.
When the borrower is applying for a second or third mortgage, the
loantovalue ratio is often known as the combined loantovalue ratio (CLTV
ratio).
Generally the fair market value of a
property is determined by an appraisal. There is one important exception,
however. When the proceeds of a mortgage loan are used to buy the same property
that is securing the loan, then that mortgage is known as a "purchase money
loan." If the appraisal comes in lower than the purchase price in a
"purchase money" transaction, then the lender will use the LOWER of
the purchase price or appraisal.
Mortgage brokers are often asked by real estate agents and buyers to base
their loan on the appraised value rather than the purchase price. Their claim is
that they have negotiated a super deal and that the property is worth much more
than what they are paying for it. This may be so (although generally untrue),
but lenders always base their maximum loan on the lower of purchase price or
appraisal. The lender's argument (its their money, so there is really very
little argument) is that an appraisal is really no more than an estimate of fair
market value, no matter how competent or conscientious the appraiser may be. The
only true indicator of value is the marketplace in which "a willing buyer
and a willing seller, each in full knowledge of the salient facts, and neither
under undue pressure, agree upon terms." If the property sells for
"X," then it is probably only worth "X."
LoanToValue Ratios seldom exceed 80%
on commercial loans, because the lender always wants some protection against
default.
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Another ratio that lenders use when underwriting a loan is the Debt Ratio.
The Debt Ratio compares the amount of bills that the borrower must pay each
month to the amount of monthly income he earns. More precisely, the Debt Ratio
is defined as:
Debt Ratio = Monthly Debt Obligations / Monthly Income
When analyzing the personal budget of a borrower, lenders use two different
debt ratios to determine if the borrower can afford his obligations. These two
debt ratios are:
 Top Debt Ratio
 Bottom Debt Ratio
The "top" debt ratio is defined as:
Top Debt Ratio = Monthly Housing Expense/Gross Monthly Income
By "monthly housing expense" we mean either the borrower's monthly
rent payments, or if she owns her own home, the total of the following 
Monthly Housing Expense
 1st mortgage payment on home plus
 Real estate taxes (annual cost/12) plus
 Fire insurance (annual cost/12) plus
 Homeowner's association dues(if home is a condo or townhouse) plus
 Second mortgage payment (if any) plus
 Third mortgage payment (if any).
You will often hear the term P.I.T.I. It refers to (P)rincipal, (I)nterest, (T)axes
and (I)nsurance. While P.I.T.I. is not exactly the same as Monthly Housing
Expense because it does not include homeowner's association dues, the two terms
are often used interchangably.
Lenders have learned over the years that a borrower's "top" debt
ratio should not exceed 25%. In other words, a person's housing expense should
not exceed 1/4 of his income. While lenders will often stretch this number to as
high as 28%, traditional lending theory maintains that anyone with a debt ratio
in excess of 25% stands a good chance of developing budget problems.
The second ratio that lenders use to determine if a borrower can afford her
obligations is the "bottom" debt ratio. It is defined as follows:
Bottom Debt Ratio = (Total Housing Expense + Debt Payments)/Gross Monthly Income
The only difference between the two ratios is the inclusion in the numerator
of "debt payments." Debt payments include the following:
Debt Payments
 Car payments
 Charge card payments
 Payments on installment loans, for example  a payment on a washer &
dryer that the borrower purchased.
 Payments on personal loans, for example  a signature loan from the
borrower's bank.
What is not included in "debt payments" is Utilities such as
PG&E, water or telephone and payments on real estate loans. Real estate
loans are usually offset first by the net rental income from the property. If
the borrower has a net positive cash flow from all his rentals, then the net
income is usually added to his "gross monthly income." If the borrower
has a net negative cash flow from all of his rental properties, then the amount
of the negative cash flow is usually added to the numerator of the
"bottom" debt ratio as if it were a monthly debt obligation, like a
car payment.
Traditional lending theory maintains that a borrower's "bottom"
debt ratio should not exceed 33 1/3%. In other words, the total of the
borrower's housing expense and debt obligations should not exceed 1/3 of his
income. Lenders often will stretch on this ratio to as high as 36%, and some
have even been known to stretch as high as 40% or more. Obviously a loan with a
debt ratio of 40% is a far more risky loan than a loan with a debt ratio of 32%.
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