Income Approachmedium8.2% of exam

A gross income multiplier differs from a gross rent multiplier in that the GIM uses:

Correct Answer

D) Total income including other sources, not rent alone

Why this is correct: A Gross Income Multiplier (GIM) uses all potential gross income from a property, including rent, parking fees, laundry income, etc. A Gross Rent Multiplier (GRM) uses only rental income. Why the other choices are wrong: "The property's current assessed value as its base figure" is not correct; both multipliers use sale price. "Net income after all operating expenses" describes a net income multiplier, not a gross multiplier. "Rent from residential units exclusively" describes a GRM, not the distinction between GIM and GRM. Exam tip: GRM = Price / Gross Scheduled Rent. GIM = Price / Gross Scheduled Income. Know which income stream your comparable data is based on.

Answer Options

The property's current assessed value as its base figure

Net income after all operating expenses

Rent from residential units exclusively

Total income including other sources, not rent alone

Why This Is the Correct Answer

Option D captures the distinction exactly: the GIM is built on total income from all sources, not rent alone. That makes it the appropriate tool for properties where ancillary revenue is meaningful, such as apartment complexes with paid parking and laundry or self-storage with fee income. Using it requires collecting the same categories of other income for every comparable so the ratios stay comparable. Both multipliers remain gross measures, so neither one accounts for operating expenses.

Why the Other Options Are Wrong

Option A: The property's current assessed value as its base figure

Assessed value has no role in either multiplier; both are derived from and applied against sale price, which reflects market behavior. Assessed values are the product of a mass appraisal process on its own calendar and often diverge widely from market value. Substituting an assessment would convert a market-derived ratio into an artifact of local assessment practice.

Option B: Net income after all operating expenses

Using income net of operating expenses describes a net income multiplier, which is simply the reciprocal of an overall capitalization rate. The defining feature of both the GRM and the GIM is that they stop at the gross line and never deduct expenses. Choosing this option collapses the distinction the question is actually probing.

Option C: Rent from residential units exclusively

Rent from residential units only describes the narrower GRM, not the GIM, so this answer names the wrong side of the comparison. It also imports a property-type restriction that is not part of either definition; a GRM can be derived for any property whose revenue is essentially rent. The examiner offers it because it sounds like a plausible specialization.

Rent is a slice, income is the pie

The R in GRM stands for Rent, one slice of revenue. The I in GIM stands for Income, the whole pie including laundry, parking, and fees. A bigger denominator makes a smaller multiplier.

How to use: When a stem lists revenue beyond rent, the question is steering you to GIM. Check whether the multiplier you were given was derived on the same basis before applying it to the subject.

Exam Tip

Keep the period straight along with the income definition. Residential GRMs are frequently quoted monthly and commercial GIMs annually, and a mismatch shifts the answer by a factor of twelve.

Common Mistakes to Avoid

-Deriving a multiplier on rent and applying it to total income
-Mixing monthly and annual income across derivation and application
-Treating a gross multiplier as if it accounted for expenses or vacancy
-Confusing a net income multiplier with the reciprocal relationship it has to the capitalization rate

Concept Deep Dive

Analysis

This tests precision about which income stream sits in the denominator of a multiplier. Both the gross rent multiplier and the gross income multiplier divide sale price by a gross figure, so both skip expenses; the difference is entirely in what counts as the income. A GRM uses rent alone, which is why it suits simple residential rentals where rent is essentially the only revenue. A GIM uses total gross income, meaning rent plus the other revenue the property generates: parking, laundry, storage lockers, vending, pet rent, application and amenity fees. Because the GIM denominator is larger, the multiplier itself will be numerically smaller than a GRM for the same property, which is exactly why mixing the two produces serious errors. The controlling discipline is consistency: derive and apply on the same income definition every time.

Background Knowledge

You need the two formulas: GRM equals sale price divided by gross rent, and GIM equals sale price divided by gross income including other income. You should also know that gross multipliers ignore operating expenses and vacancy, and that both must be derived from and applied to income measured on the same basis and period.

Real-World Application

On a 40-unit complex with paid covered parking and a card-operated laundry, you gather rent and ancillary income for four sold comparables, compute a GIM for each, and apply the reconciled multiplier to the subject's total gross income. You state in the report which income categories were included so a reviewer can reproduce the calculation.

gross income multipliergross rent multiplierother incomeancillary revenueincome consistency

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