A lender looked at a rental last month and read the coverage ratio at 1.33. Comfortable. Approvable. The investor looked at the same property and figured he was clearing about 1,978 dollars a year in cash flow. Also fine, if unspectacular.
Both numbers were correct. Both numbers were also missing the roof.
The roof on that property had maybe eight years left. So did the furnace. The kitchen was original to a 1994 renovation. None of that appears in a debt service coverage ratio, and none of it appears in net operating income either, because the accounting convention that produces NOI treats capital expenditures as below the line. Your lender is not hiding anything from you. It is measuring a different thing than you are, and if you never do the second calculation yourself, nobody is going to do it for you.
This is the post about the second calculation.
What a capital expenditure actually is, and why NOI excludes it
An operating expense is money you spend to keep the property running this year. Turning a unit, fixing a leaking trap, paying the insurance premium, cutting the grass. A capital expenditure is money you spend on something with a useful life measured in years or decades. A roof. A furnace. A service panel. A sewer lateral. Windows.
NOI deducts the first category and ignores the second. That is not sloppiness, it is the definition. NOI is meant to describe the earning power of the property independent of how it is financed and independent of the lumpy timing of capital replacement. It is a useful number for exactly that reason, and we built a full walkthrough of how to construct an NOI a lender will accept because getting it right matters.
But a number that is useful for comparing properties is not automatically useful for predicting your bank balance. A roof does not care that it is below the line. It costs twelve thousand dollars in the year it fails, and it fails whether or not you set money aside.
The CapEx reserve is how you convert a lumpy, unpredictable, decade-scale cost into a monthly number you can actually plan around. It is the single most commonly skipped line in investor underwriting, and skipping it is why so many rentals that “cash flow on paper” quietly do not.
Three different things called reserves, and only one of them is this
The word gets overloaded. Before we size anything, here is what we are not talking about.
Lender cash reserves are months of principal, interest, taxes, insurance and association dues that you have to document in a bank account at closing. Six months is a common ask on a rental file, more if the credit profile is thin. That money is a qualification requirement, it sits in your account, and you keep it. We cover the sizing rules in the reserve requirements guide and how it interacts with score in credit score and reserve requirements.
Rehab contingency reserves are the cushion inside a fix and flip budget for cost overruns on a project already scoped. That is a construction-loan concept with a defined end date, covered in contingency reserves for fix and flip budgets.
CapEx reserves are yours. No lender asks for them, no lender verifies them, no lender gives you credit for having them. They are an operating decision you make about a property you intend to hold. That is exactly why they get skipped.
Sizing it: the component method beats the rule of thumb
You will hear percentages thrown around. Five percent of gross rent. Ten percent. Fifty dollars a door a month. Those are fine as a sanity check and terrible as an actual budget, because a 1958 house with a twenty-two-year-old roof and a 2019 build with a transferable warranty do not have the same capital exposure, and no percentage of rent knows the difference.
The method that works is boring. List the major components. Estimate replacement cost and remaining life for each. Divide. Add.
Here is that exercise on a real-shaped property, a three bedroom single family renting for 2,200 dollars a month.
| Component | Replacement | Life | Annual |
|---|---|---|---|
| Roof | 12,000 | 25 yr | 480 |
| Furnace and condenser | 7,500 | 18 yr | 417 |
| Water heater | 1,600 | 10 yr | 160 |
| Kitchen | 12,000 | 25 yr | 480 |
| Bathroom | 6,000 | 25 yr | 240 |
| Flooring | 5,000 | 12 yr | 417 |
| Siding and exterior paint | 8,000 | 20 yr | 400 |
| Windows | 9,000 | 30 yr | 300 |
| Service panel and branch wiring | 3,000 | 35 yr | 86 |
| Sewer lateral | 6,000 | 50 yr | 120 |
| Total | 70,100 | 3,100 |
Three thousand one hundred dollars a year. Two hundred fifty eight dollars a month. That is 11.7 percent of gross rent on this property, which is well above every rule of thumb you will hear quoted, and it is the number the components actually produce.
Two notes on doing this honestly. First, use remaining life, not full life. A twenty-year-old roof with a twenty-five-year rating does not have twenty-five years left, it has five, and your annual accrual for it is 2,400 dollars, not 480. Second, replacement cost means what it costs where the property is, from a contractor who will actually show up, in the year you will actually spend it. Costs have moved. Numbers you priced in 2019 are not the numbers.
What that does to the deal
Now put both calculations on the same property. Purchase price 240,000 dollars, 25 percent down, loan amount 180,000 dollars at 7.25 percent on a thirty year amortizing term. Taxes 3,600 dollars a year, insurance 1,560 dollars a year.
The lender’s read. Principal and interest come to 1,228 dollars. Add 300 dollars of monthly taxes and 130 dollars of monthly insurance and the full housing payment is 1,658 dollars. Market rent is 2,200 dollars. Coverage is 2,200 divided by 1,658, or 1.33. That clears the typical 1.20 threshold with room, and a lender does not ask a single question about the roof. If you want to run your own property through the same arithmetic, the DSCR deal calculator does it in about a minute, and the DSCR calculation walkthrough shows why lenders use gross rent rather than your operating numbers.
Your read. Gross scheduled rent 26,400 dollars. Take 5 percent for vacancy, which is 1,320 dollars, leaving 25,080. Deduct taxes of 3,600, insurance of 1,560, management at 8 percent of collected rent which is 2,006, and routine repairs of 1,200. NOI lands at 16,714 dollars. Annual debt service is 14,736. Cash flow before capital, 1,978 dollars a year.
Now fund the reserve. Subtract 3,100 dollars. You are at negative 1,122 dollars a year.
That is the whole point. A property with a 1.33 coverage ratio, a clean approval and 165 dollars a month of apparent cash flow is actually consuming about ninety-four dollars a month of your money once you are honest about the fact that the furnace is going to die. Nothing in the loan file is wrong. The lender measured what a lender measures, and it measured it correctly. It just is not the number that determines whether you want to own this.
Why lenders leave it out on purpose
It is worth understanding the logic rather than treating it as an oversight, because the logic tells you where else the same gap appears.
A lender is underwriting its ability to be repaid over a defined term against collateral it can foreclose on. Capital expenditure timing is unknowable, unverifiable and entirely within the borrower’s control. A lender cannot audit whether you replaced the roof. It can audit rent, taxes and insurance. So it builds a ratio out of the things it can verify and it manages the rest through loan to value, through condition ratings on the appraisal, and through requiring cash reserves at closing.
Notice that the same reasoning is why lenders use gross rent rather than your net, which is covered in why lenders use gross rent. Verifiability drives everything. The ratios are not a picture of the investment. They are a picture of the collateral’s ability to service debt under standardized assumptions.
Once you see that, the other investor metrics fall into place. Cap rate has the same blind spot, which we get into in cap rate versus DSCR. So does the one percent rule, discussed in where the one percent rule breaks, and so does gross rent multiplier, which we take apart in what GRM hides. Every one of them is a screening tool built from verifiable inputs. None of them is a budget.
Turnover is the reserve nobody budgets either
Capital replacement is the big one, but there is a second lumpy cost with the same accounting problem: turnover. A tenant leaves, the unit sits, you paint and clean and replace whatever got destroyed, and you pay a leasing fee to fill it.
Say average tenancy runs three years. A turn costs you one and a half months of vacant rent, which is 3,300 dollars, plus about 1,500 dollars in make-ready work, plus a leasing fee of half a month at 1,100 dollars. That is 5,900 dollars every three years, or roughly 1,967 dollars a year, or 164 dollars a month.
Add that to the 258 dollars of monthly CapEx accrual and you are reserving 422 dollars a month on a property renting for 2,200. Nineteen percent of gross rent, before the mortgage. If that number feels high, that is the useful part. It is high, and it is real, and the properties that quietly disappoint their owners are the ones where it was assumed to be zero.
Old houses, old systems, and the reserve that is really a repair bill
There is a category of property where the CapEx line stops being a slow accrual and becomes an immediate obligation, and that is housing stock with systems an insurer will not write.
Knob and tube wiring, fuse panels and aluminum branch wiring will get a policy declined or non-renewed, and a declined policy on a financed property is not an inconvenience, it is a default trigger. We wrote up how that plays out on a project in knob and tube, fuse panels and aluminum wiring on a fix and flip, and the same dynamic hits roofs, which is the subject of how an insurance decline reprices a finished file.
On those properties the electrical line in your component table is not 86 dollars a year. It is a rewire you fund before the policy binds. Underwrite it that way at acquisition, not after.
Where to actually keep the money
Practical answers, in rough order of how most investors handle it.
A separate account per entity is the cleanest. One operating account, one reserve account, an automatic monthly transfer of the accrual amount on the day rent posts. It is unglamorous and it works, mostly because it removes the decision.
Some investors keep the reserve pooled across a portfolio rather than per property, which is defensible once you have five or more doors, because roofs do not all fail in the same year and pooling smooths it. Below five doors, pooling mostly means one bad year eats the whole fund.
A line of credit is a supplement, not a substitute. Credit is available right up until the moment a lot of people need it at once, which tends to correlate with the moment your tenant stops paying. Fund the reserve with cash and keep the credit line for genuine surprises.
And keep the reserve separate from the lender cash reserves you documented at closing. Those are two different pools doing two different jobs, and spending one because you counted it twice is a very common way to end up short on both.
How to use this at the offer stage
The reserve calculation is most valuable before you own the property, because it is an input to price.
Build the component table off the inspection report and the age of the house. Get the annual accrual. Subtract it from your projected cash flow. If the deal only works with the reserve set to zero, the deal does not work, and the right response is a lower offer or a different property, not a more optimistic spreadsheet.
If the accrual is large because the systems are near end of life, that is a negotiating fact, not a reason to walk. A roof with five years left is a 12,000 dollar liability you are assuming, and it belongs in the price the same way a needed repair does.
And when you are comparing two properties with identical coverage ratios, the component table is usually the thing that separates them. A 1.33 on a 2015 build and a 1.33 on a 1952 build are not the same investment, and the ratio will never tell you that.
The short version
Your lender’s ratio and your return are two different calculations, built from different inputs, for different purposes. The ratio decides whether the loan closes. The reserve decides whether you are glad it did.
Run the coverage number first so you know what you can finance, then run the component table so you know what you are actually buying. If you want a second set of eyes on either one, or you want to talk through how a specific property prices out, get in touch. We are a Pittsburgh-based brokerage and we place rental and renovation loans for investors across Pennsylvania and additional states, and we would rather have the reserve conversation with you before closing than after the furnace goes.
FMC Capital LLC, NMLS #1840537. This article is general information about investment property financing and is not tax, legal or investment advice. Loan terms, rates, ratios and reserve requirements vary by lender, property, borrower and market, and are subject to change. Nothing here is a commitment to lend.
Ready to run your numbers? Start with the DSCR deal calculator, review current rental loan requirements, and then call 412-990-2941. FMC Capital LLC, NMLS #1840537.