Definition
Other income (also called ancillary income) is revenue a property generates in addition to base rent. In multifamily, it commonly includes utility reimbursements, parking, pet fees, storage, late fees, application/admin fees, and add-on services. Underwriters track it because it can materially impact NOI and value—especially when cap rates are tight.
What Counts as Other Income
“Other income†should reflect recurring, collectible, and defensible revenue streams. Common categories include:
- Utilities: RUBS, ratio billing, submeter reimbursements, water/sewer trash recovery.
- Parking: reserved spaces, covered parking, garages, EV charging fees.
- Pets: pet rent, one-time pet fees, DNA programs (where legal/used).
- Storage: lockers, garages, bike storage, extra closets.
- Fees & admin: application, admin, lease initiation, NSF, package lockers (if billed).
- Services: laundry income, valet trash (if billed), furnished premiums, short-term fees.
- Insurance programs: resident liability programs (where allowed), risk/coverage pass-throughs.
How It’s Underwritten
Other income is usually modeled as either $ per unit per month (e.g., “$45/unit/monthâ€) or by line item based on historical collections and the rent roll. The key is to separate: contracted (already in place) from pro forma (requires execution).
Common approaches
- Trailing 3–12 month average: use actual collections, adjusted for one-time anomalies.
- $ / unit / month benchmark: sanity-check against comparable assets in the submarket.
- Occupancy-linked: model certain income streams as proportional to occupied units (parking, pets, insurance, etc.).
- Program ramp: phase in new initiatives (RUBS rollout, parking monetization) over time, not all at once.
Why It Matters
Other income can be a “quiet lever†for NOI growth because it’s often operational rather than market-driven. However, it’s also one of the easiest places to overstate value in underwriting. Investors should treat it with the same skepticism as rent growth assumptions: verify collections, confirm legality, and stress-test for pushback.
Investor Uses
- Value-add planning: identify monetizable amenities (parking, storage, RUBS/submeter).
- Expense recovery: offset controllable costs like water/sewer/trash through reimbursements.
- Operational diagnostics: compare “other income per door†vs comps to find leakage.
- Stabilization strategy: diversify revenue beyond rent when rent growth is constrained.
Example
A 100-unit property collects an average of $4,500/month in other income, broken out as: $2,000 utilities reimbursements, $1,500 parking, $800 pet rent, and $200 storage.
- Other Income per Unit = $4,500 ÷ 100 = $45/unit/month
- Annual Other Income = $4,500 × 12 = $54,000/year
If the market cap rate is 5.50%, that $54,000 of annual other income supports roughly $981,818 of value (54,000 ÷ 0.055), assuming it is stable and collectible.
Common Pitfalls
- Counting one-time fees as recurring: application or pet fees may spike during turnover-heavy periods.
- Not netting pass-through expenses: utility reimbursements may come with admin costs or bad debt.
- Legal / lease constraints: some fees require lease language, notice, or are regulated by state/local rules.
- Conflating “billed†with “collectedâ€: underwrite collections, not just charges.
- Over-optimistic adoption: assuming 60% of residents will pay for parking without proof.
- Ignoring friction: resident pushback can increase churn, concessions, or delinquency.