How a replacement reserve account works in your books, and what it does for taxes
A replacement reserve is a separate account you fund monthly for big future costs like roofs and boilers. Putting money into it is a transfer between your own accounts, not an expense, so it does not reduce your taxable income by itself. The cost is recorded when you pay for the work, as a repair deducted that year or as an improvement that is depreciated.
How the account works
Our posts on how much to set aside and budgeting reserves per unit cover the amount. This post covers the mechanics once you have a number. The reserve is its own bank account in the property's books. Each month a fixed amount moves from the operating account to the reserve account. The balance grows until a big job comes due, and then the job is paid from the reserve.
Keeping it in a separate bank account does two things. It keeps the money from being spent on routine costs, and it makes the balance visible: you can see at a glance whether the building can afford the roof.
What the entries look like
- Funding: take money from operating cash and put it in reserve cash. Both are asset accounts in the same property. Net income does not change.
- Spending: when a vendor is paid from the reserve account, record the cost where it belongs. A repair goes to a repair expense account. An improvement goes to a fixed asset account and is depreciated.
- Refilling: any shortfall after a big job is covered by raising the monthly transfer, not by quietly reusing the operating account.
Example a made-up 20 unit building transfers $20 per unit a month, or $400 a month, to its reserve account. After 36 months the reserve holds $14,400 ($400 times 36), ignoring interest. The owner then pays $3,300 from it for three replacement water heaters at $1,100 each. The reserve falls to $11,100. Whether the $3,300 is deducted as repairs or added to the building and depreciated is a tax question for the owner's preparer. Either way, no tax effect arose in the 36 months of transfers.
Why the transfers are not deductible
A rental owner on the cash method generally deducts expenses in the year they are paid to someone else. Moving your own money from one account to another is not paying anyone, so it is not an expense. The IRS explains what is deductible, and how repairs and improvements differ, in Publication 527. Improvements are recovered through depreciation, which the IRS covers in Publication 946.
A reserve a lender requires and holds on your behalf has its own rules, and what the loan documents say matters. Ask your tax preparer how a lender-held reserve should be recorded.
Rules for spending the reserve
- Write down what the reserve is for: large replacements, not routine repairs or monthly bills.
- Require approval for every withdrawal and note which component it replaced.
- Keep a list of components with their age, expected life and replacement cost, and revisit it every year.
- Leave interest earned in the account unless you decide otherwise, and report it as the income it is.
- When you sell, the buyer will ask what condition the building is in. A record of what the reserve paid for is evidence.
How DoorKeeping handles it
In DoorKeeping, each property has its own books and bank accounts, so a reserve account sits alongside the operating account for the same property and transfers between them are recorded as transfers, not expenses. A bill paid for a roof or a boiler is coded as a repair or an improvement, and the lines that need a decision are marked for you. You can ask Claude or ChatGPT what each property's reserve balance is per unit, or how much was spent from reserves this year. Anything involving money waits for your one-tap approval. Rent and payments stay in your own bank accounts. DoorKeeping never holds your money and sends a payment only when you approve it. It costs $2 per unit a month, every feature included, no setup and no minimum. DoorKeeping gives no tax advice; confirm treatment with your tax preparer.
Sources
- IRS, Publication 527, Residential Rental Property, read Oct 30, 2026
- IRS, Publication 946, How To Depreciate Property, read Oct 30, 2026
Questions
- Are replacement reserve contributions tax deductible?
- Not by themselves. A transfer to your own reserve account is not an expense. The cost is recorded when you pay for the work, as a repair deduction or a depreciated improvement.
- Should a reserve be in a separate bank account?
- It is a good practice. A separate account keeps the money from being spent on routine costs and makes the balance visible.
- What can I spend a replacement reserve on?
- Large replacements such as a roof, a boiler or flooring, not routine repairs or monthly bills. Write the rule down before the first withdrawal.