Replacement reserves are funds set aside on a regular schedule to pay for major capital items down the road, such as roofs, parking lots, HVAC systems, and appliances. Unlike routine repairs, these are large, periodic costs, and the reserve spreads them out so the money is there when the work is needed.
Lenders often require reserves and collect them monthly alongside the mortgage payment. They size the amount per unit or per square foot, for example $250 to $300 per unit each year on multifamily. An engineering report at closing helps set the figure based on the property's condition and remaining useful life.
Underwriters typically subtract replacement reserves when calculating NOI, even when the current owner does not fund them. That lowers the NOI used for sizing, which is why reserves affect both value and the loan amount a property can support.

