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CapEx is the roof, the HVAC, the water heater, and the kitchen that will not wait for a good quarter. Here is how reserve budgets are typically built, with published ranges, and why none of those ranges is a recommendation for your unit.
By RentalAnalytics Editorial Team · Published September 3, 2026
Capital expenditures are the large, infrequent costs that restore or improve a long-lived part of the property. Stessa's landlord guide lists reroofing, electrical or plumbing upgrades, new windows or doors, and interior work that changes a unit's layout or finish.[1] Those projects do not show up every month. They do show up eventually, which is why owners who skip a reserve treat deferred replacements as if they were free cash flow.
IRS Publication 527 draws the line landlords actually have to keep. Repairs that keep the property in an ordinarily efficient operating condition are generally deductible in the year paid. Improvements that add value, prolong useful life, or adapt the property to a new or different use are capital and are recovered through depreciation, not as a current expense.[2] A leaking faucet is usually a repair. A new roof is usually an improvement. The reserve is the cash plan. The IRS tests decide the tax year.
There is no official per-unit schedule from HUD or the Census. What exists are published methods. Stessa describes two that landlords actually use.[1]
A third method does not start with a percentage. Itemize the major systems (roof, HVAC, water heater, appliances, flooring), divide each replacement cost by remaining useful life, and sum the annual amounts. That produces a property-specific dollar figure. It takes more work and still depends on your cost and life assumptions. It is a method, not a published national average.
Per-unit math is just the property total divided by unit count. A fourplex using the 10% rent method on $1,400 per unit would reserve $140 per unit per month, or $560 for the building. The same building using 1% of a $480,000 value would reserve $4,800 a year, or $100 per unit per month. The two methods do not agree, which is the point: they are heuristics, not measurements.
Age, climate, construction quality, and what was just replaced dominate the number. A 1970s roof with three years of life left is not a 10% problem. It is a near-term cash problem. A 2024 build with a new HVAC is not a 20% problem. Stessa's own write-up says the rent-percent method moves with age, and that a CapEx account should not be raided for other expenses.[1]
This page reports those ranges so you can see how the methods work. It does not tell you to adopt 10%, 15%, 1%, or 2% on a specific address. A property in a hail belt, a coastal insurance market, or a city with expensive dump fees will not match a national blog example. Run the component list against local replacement quotes if you need a number you can defend.
Standard net operating income subtracts recurring operating costs and stops before capital replacements, debt service, and depreciation. Investopedia's NOI definition excludes capital expenditures along with loan payments and depreciation.[3] That is why a listing package can show a clean NOI and still leave the buyer to fund a roof from equity. See the NOI walkthrough for the identity that sits under cap rate and DSCR.
The Census Bureau and HUD Rental Housing Finance Survey reports operating expenses as a snapshot of financial health for single-family and multifamily rentals, and the published means exclude debt service and capital improvements.[4] The 2020 mean for one-unit rentals was $6,194 a year, about $516 a month. That figure is a sanity check on opex, not a CapEx reserve. If you treat RHFS opex as "already including the roof," you will under-reserve.
The operating expense ratio is the right next check on the recurring side. CapEx sits next to it, not inside it, unless you are deliberately modeling a reserve as a below-the-line cash item.
The cash flow analyzer has a maintenance input. That line is a recurring reserve estimate for upkeep. The tool's own results note says the calculator does not include capital expenditures such as a roof or HVAC and that a separate reserve is commonly modeled. Use maintenance for ordinary repairs. Add CapEx as its own assumption when you read cash flow, so a year that looks fine on opex does not hide a $12,000 system replacement.
The operating expense benchmark compares taxes, insurance, maintenance, and management as percents of effective gross income to an illustrative national mid-band. The file's own metadata says the total opex band typically includes utilities, admin, and reserves beyond the four typed lines, and that the bands are not metro measurements. A "below band" maintenance line can still be incomplete if CapEx is sitting in a different account.
BiggerPockets' Rookie 575 episode flags vacancy and CapEx as the two set-asides rookies most often skip, then sends the full acquisition, income, and expense set through a calculator for NOI and cash flow.[5] That is the same sequence here: pick a reserve method, write the number down, and let the P&L show whether the deal still works. Education only. Not a recommendation to hold any particular reserve balance.
A CapEx reserve is money set aside for capital expenditures: long-lived replacements and improvements such as a roof, HVAC system, or major remodel. It is not the same as routine maintenance, and it is not the same as net operating income.
Published rules of thumb vary. Stessa describes about 10% of collected rent for CapEx, or 15% to 20% on an older property, and an alternative of 1% to 2% of property value per year. Those are reported ranges for budgeting, not a recommendation for a specific unit.
Usually no. Standard NOI subtracts recurring operating costs and leaves capital replacements below the line. Routine repairs can sit in operating expenses. A roof replacement is a capital event. Confusing the two inflates NOI and understates the cash you need on hand.
IRS Publication 527 treats repairs that keep a rental in ordinary operating condition as currently deductible expenses. Improvements that add value, prolong useful life, or adapt the property to a new use are capitalized and recovered through depreciation. The reserve funds the cash. The tax treatment follows the IRS tests.
The maintenance line is a recurring reserve estimate. The calculator note states that it does not include capital expenditures such as a roof or HVAC and that investors often model a separate reserve. Use that line for routine upkeep, then add a CapEx assumption outside or on top of it.
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