How much to set aside for replacement reserves on a rental or apartment building
There is no single right number. Size replacement reserves from your own building: list each major system, its age, its expected remaining life and its replacement cost, then divide each cost by the years left and add them up. Owners often express the result per unit per year to compare buildings, and a lender with a loan on the property sets its own required amount from an inspection of the property, not from a rule of thumb.
What replacement reserves are, and what they are not
A replacement reserve is money you set aside, usually every month, for big items that wear out on a schedule: roofs, boilers, water heaters, flooring, appliances, parking lots, windows. It is not for routine repairs, which come out of the operating budget. It is a savings habit that spreads a big, predictable cost over the years before it arrives.
Two different things are called a reserve. One is your own savings account, which you control. The other is a lender's required reserve, which is a custodial account the loan documents require you to fund and which the lender releases against approved work. Fannie Mae's Multifamily Guide, for example, requires a lender to ensure that the costs of the items in a replacement reserve schedule are fully funded for certain loans, and sets that schedule from the property's condition assessment (Part II, Section 406.02, effective October 26, 2026). If your loan has one, its terms win over anything in this article.
For bookkeeping, a reserve is a transfer between your own accounts, not an expense. Money moved to a reserve account is still yours and does not change profit. The expense happens later, when the roof is replaced and the cost is either deducted or depreciated, as covered in partial disposition and a roof replacement.
The method: age, life, cost
- List every major system. Roof, exterior paint or siding, windows, parking and paving, boilers or HVAC, water heaters, plumbing risers, electrical panels, elevators if any, flooring, appliances, and each unit's kitchen and bath.
- Write down each item's age and a realistic remaining life. A contractor, an inspector or the last inspection report can give you the remaining life. Be honest: a roof that is 18 years old with a 20 year product is not a 20 year roof.
- Get a current replacement cost for each, from a bid or a recent invoice. Do not use last decade's price.
- Divide each cost by its remaining years. That is the yearly amount that item needs.
- Add the yearly amounts and divide by 12 for the monthly transfer. Divide the yearly total by the number of units to get a per unit per year figure you can compare across buildings.
A worked example
Example a made-up 12 unit building. The roof needs replacing in 8 years at $48,000, so it needs $6,000 a year. Two boilers need replacing in 6 years at $15,000 each, so $5,000 a year. The parking lot needs repaving in 10 years at $20,000, so $2,000 a year. Appliances (12 refrigerators and stoves) have an average remaining life of 5 years and cost $18,000 to replace, so $3,600 a year. Floors and paint across 12 turns cost $1,500 per unit over an average of 5 years of occupancy per unit, so $1,500 x 12 / 5 = $3,600 a year.
Example the total is $6,000 + $5,000 + $2,000 + $3,600 + $3,600 = $20,200 a year, or $1,683 a month. Divided by 12 units, that is $1,683 per unit per year ($20,200 / 12). A different building with newer systems might need far less; an older one, far more. The point of the exercise is to see your own number instead of borrowing someone else's.
Two cautions on the math. First, replacement costs rise over time, so revisit the list each year and adjust. Second, do not count normal turnover costs such as cleaning and touch-up paint twice: if they run through your operating budget every year, leave them out of the reserve.
Rules of thumb, and why to treat them with care
You will see owners quote a flat per unit per year number, or a percentage of rent. They are useful as a sanity check after you have done the list above, and unreliable as a starting point, because two buildings of the same size can need very different amounts depending on the age of their roofs and mechanical systems. A flat number also hides the real question, which is whether you will have the cash in the year the boiler fails.
- Newer building (under about ten years): the list is mostly about appliances and flooring, and the reserve can start small. Raise it as the big systems age.
- Middle-aged building: this is where the list matters most, because several large items come due within a few years of each other.
- Old building with deferred maintenance: a reserve alone will not catch up. Budget a one-time capital plan for the items that are already overdue, then reserve for the rest.
If you are buying, underwrite the reserve from the building's actual inspection, and lower the offer for items that are already due. Your own inspection will do this better than any rule of thumb.
How to keep a reserve in your books
- Use a separate bank account for the reserve, so it is not spent on operating costs by accident. In the chart of accounts it is an asset account, like the one in the rental property chart of accounts.
- Record each monthly transfer as a transfer between your own accounts, not as an expense.
- When you spend reserve money, categorize the cost normally: a repair on the repairs line, a replacement as a capital improvement that is depreciated. The reserve account only funds it.
- Show reserve deposits below the line on your T12 and owner statement, so net operating income is not understated. Some lenders underwrite with a reserve deduction of their own, which is a separate calculation.
How DoorKeeping handles it
In DoorKeeping, each property's LLC keeps its own bank account and books, so a reserve account can sit alongside the operating account and its balance shows up with the rest of the property's money. Expense accounts map to Schedule E lines, and replacements can be kept apart from repairs, which makes the repair versus improvement call easy to see later. Any transfer or payment of money waits for your one-tap approval.
Sources
Questions
- Is a replacement reserve a tax deduction?
- No. Moving money into a reserve account is a transfer between your own accounts. The tax effect comes later, when you spend the money on a repair, which is deducted, or an improvement, which is depreciated.
- How is a replacement reserve different from a repair budget?
- A repair budget covers routine fixes every year. A reserve builds up for large items that wear out on a long cycle, such as a roof or a boiler.
- Does my lender decide the reserve?
- If your loan requires a reserve, yes. The loan documents set the amount and the account, and the lender usually bases it on an inspection of the property. Read your loan documents.