Why NOI Is So Easy to Manipulate on Small Multifamily
Small apartment buildings (roughly three to twenty units) rarely come with audited financials. Sellers often manage these properties themselves or through a small local firm, and their bookkeeping reflects that informality. There is no institutional oversight requiring consistent accounting standards, so the figures a seller hands you in a marketing package are only as reliable as the seller's incentives to be accurate.
The manipulation is not always intentional. Some sellers genuinely believe their property performs better than it does because they exclude costs they handle personally (their own labor, for instance) or because they annualize a strong month rather than averaging a full operating year. Others are more deliberate. Either way, the buyer bears the risk.
Connecticut adds a few layers of complexity. Property tax assessments vary by town and reassessment cycle, so a figure from two years ago may not reflect current mill rates. Insurance costs have risen sharply in recent years, particularly for older wood-frame buildings common in cities like Bridgeport, New Haven, and Hartford. And utility cost structures differ between properties where tenants pay their own utilities and those where the owner covers heat or water, a distinction that dramatically changes the expense load.
Understanding these local dynamics is part of what separates a buyer who closes on a good deal from one who inherits someone else's problem. For a broader look at how to find properties worth underwriting in the first place, the how to find off-market small multifamily deals resource covers sourcing strategies that reduce the chance of starting with a compromised seller package.
Income-Side Red Flags: Rent Rolls, Vacancy, and Other Income
The income side of a pro forma is where sellers have the most room to present an optimistic picture. Here is where to focus your scrutiny.
Rent roll versus actual leases. A rent roll is a summary document. It tells you what the seller says tenants are paying. Actual signed leases tell you what tenants are legally obligated to pay and under what terms. Request every current lease and compare the rent amounts line by line. Discrepancies, even small ones, are a signal to dig deeper. Also check lease expiration dates: a building where half the leases expire within sixty days of closing carries a different risk profile than one with staggered, long-term tenancies.
Market rent versus in-place rent. Some sellers present a pro forma based on "market rents" rather than what tenants are actually paying. If the building has below-market leases, the income figure on the pro forma is hypothetical. Underwrite to in-place rents, then model the upside separately.
Vacancy assumptions. A seller who uses a 3 percent vacancy assumption in a market where comparable buildings run 8 to 10 percent is handing you a distorted income figure. Pull local vacancy data for the submarket. Connecticut college towns like New Haven or Storrs can show seasonal vacancy patterns that a single-month snapshot will miss. The piece on small multifamily rent growth limits in NC college towns illustrates how seasonal and institutional demand patterns affect income projections, and the same analytical discipline applies in CT markets with university-driven rental demand.
Concessions and loss-to-lease. If the seller offered free months or reduced deposits to fill units recently, the current rent roll may overstate stabilized income. Ask directly whether any current tenants received move-in concessions in the past twelve months.
Other income. Laundry income, parking fees, pet fees, and storage rents often appear on pro formas. Verify each line with receipts or bank statements. Laundry income from a single coin machine is frequently overstated. Parking income is only reliable if the spaces are formally assigned and documented.
Rent roll red flags to watch for:
- Rents that are round numbers across every unit (a sign of estimation rather than actual leases)
- Month-to-month tenancies on most or all units
- Any unit listed as "owner occupied" or "manager unit" at zero or below-market rent
- Tenants who are family members of the seller
- Recent large rent increases just before listing (which may not be sustainable or may trigger tenant disputes)
For a deeper look at how rent roll problems surface in Connecticut-adjacent markets, the NC multifamily rent roll red flags that kill deals article covers the same verification framework with useful examples.
Expense-Side Red Flags: What Gets Left Off the Seller's Pro Forma
The expense side is where the most consistent distortions appear, because sellers have every incentive to minimize the cost picture. These are the categories that most often get understated or omitted entirely.
Property taxes. Connecticut towns reassess on varying schedules, and mill rates differ significantly across municipalities. A seller may present last year's tax bill, which does not reflect a pending reassessment. Pull the current assessment from the town assessor's database and calculate the tax liability at the current mill rate yourself. In cities like Bridgeport or Waterbury, property taxes on a six-unit building can represent 20 to 30 percent of gross income. That figure changes the entire underwriting picture.
Insurance. Small multifamily insurance costs in Connecticut have increased meaningfully, particularly for older buildings and those in flood-adjacent zones. A seller who has not shopped their policy recently may be presenting a premium that no longer reflects current market rates. Get your own insurance quote during due diligence and use that figure, not the seller's.
Utilities. In buildings where the owner pays heat, water, or electricity for common areas, utility costs are a real and variable expense. Sellers sometimes present a single year of utility bills that happened to be mild. Request three years of utility statements and average them. Also confirm which utilities the owner pays versus tenants: this structure is not always clearly documented in older buildings.
Management fees. Self-managed sellers frequently omit management fees entirely from their pro forma, on the logic that they do not pay themselves. If you plan to hire a property manager (or if you want to value the property on a basis that reflects its true cost structure), include a management fee of 8 to 10 percent of collected rents. Skipping this line item inflates NOI by a meaningful amount on a small building.
Maintenance and repairs. A seller who has deferred maintenance will show low repair costs in recent years. That is not a sign of a well-run building; it is a sign of deferred capital expenditure that will land on the buyer. Review the actual repair history and compare it to what a reasonable maintenance budget should look like for a building of that age and unit count.
Capital expenditures. CapEx is not technically an operating expense, but it belongs in your underwriting. Roofs, HVAC systems, water heaters, and exterior work on older Connecticut buildings carry significant replacement costs. A seller's pro forma will never include CapEx. Your underwriting should.
Vacancy and credit loss. Some sellers present gross income with no vacancy or credit loss line at all. Others use a token 3 to 5 percent figure. Use actual market vacancy data and add a credit loss assumption of at least 1 to 2 percent for uncollected rent.
How to Cross-Check NOI Against Third-Party Sources
Verifying NOI means going beyond the seller's documents. Here are the third-party sources that provide independent confirmation or contradiction.
Bank statements. Twelve to twenty-four months of the seller's operating account statements will show actual rent deposits, actual expense payments, and any irregular transactions. This is the single most reliable cross-check available. If a seller refuses to provide bank statements, treat that refusal as a significant red flag.
Tax returns (Schedule E). The seller's federal tax return, specifically Schedule E for rental income and expenses, reflects what the seller reported to the IRS. Sellers are motivated to minimize taxable income on their returns, which means their tax return will often show lower income and higher expenses than their marketing pro forma. If the pro forma NOI is significantly higher than what the Schedule E implies, ask why.
Town assessor records. Connecticut town assessors maintain public records on property assessments, and many towns publish this data online. Use these records to verify the current assessed value and calculate the tax liability independently.
Utility company records. For properties where the owner pays utilities, you can request utility usage history directly from the utility provider with seller authorization. This is a standard due diligence request and a seller who objects to it deserves scrutiny.
Comparable rental data. Pull rental listings for comparable units in the same submarket to verify that in-place rents are consistent with the market. If the seller's rents are above market, understand why: either the units are genuinely superior, or the rents are not sustainable.
Insurance quotes. Contact two or three insurers and get actual quotes for the property. This gives you a real expense figure rather than the seller's potentially outdated premium.
For a structured look at what serious buyers review across the full due diligence process, the small multifamily due diligence guide covers the complete checklist in a format you can adapt for CT deals.
What to Do When the Numbers Do Not Add Up
Finding NOI discrepancies during due diligence is not automatically a reason to walk away. It is a reason to make a decision with accurate information. Here is how to think through the options.
Quantify the gap first. Calculate the corrected NOI using your verified income and expense figures. Then apply the same cap rate to the corrected NOI to arrive at a supportable offer price. The difference between the seller's implied value and your supportable value is the size of the problem.
Renegotiate with documentation. If the gap is meaningful but the property still makes sense at a lower price, present your findings in writing. Show the seller exactly which line items you adjusted and why. A seller who is acting in good faith will engage with documented discrepancies. A seller who becomes defensive or refuses to provide supporting documents is telling you something important.
Use contingencies to protect yourself. Connecticut purchase contracts can include due diligence contingencies that allow you to renegotiate or exit based on findings during the inspection and review period. Make sure your contract includes adequate time and clear language around financial due diligence, not just physical inspection.
Know when to walk. If the corrected NOI produces a value that is materially below the asking price and the seller will not adjust, the deal does not work at the current terms. Walking away from a deal with bad numbers is not a failure; it is the correct outcome of a disciplined process.
Consider what the discrepancy signals about the seller. A seller who presents inflated figures may also have deferred maintenance, undisclosed tenant issues, or other problems that have not surfaced yet. The integrity of the financial package is a proxy for the integrity of the overall transaction.
Buyers who want access to seller packages that have already been reviewed for completeness, and who want direct connections to motivated sellers in their target CT markets, can learn more about how FlowExit connects buyers and sellers through its learn resources or reach out directly at flowexit.com.
NOI verification is not glamorous work, but it is the work that separates investors who build durable portfolios from those who spend years recovering from a single bad acquisition. In Connecticut's high-tax, high-cost environment, the margin for error on a small apartment building is thin. Getting the NOI right before closing is the most important thing a buyer can do.