Picture your association's bank balance in February. Operating cash is running thin after a heavy snow-removal season, but the reserve account holds $180,000 earmarked for a roof replacement three years out. Nobody would notice if you quietly paid a few operating bills from the reserve side and "paid it back" when spring dues arrive. That quiet transfer is exactly how treasurers turn a healthy association into a legal and tax problem — in several states it is a per se violation, and at tax time it can cost the association real money.
Every dollar your members pay splits into two different jobs the moment it arrives: keeping the lights on today, and replacing the roof tomorrow. This guide shows how to keep those two jobs — and the two piles of money behind them — properly separated, what happens when they bleed together, and how the IRS taxes the reserve pile even when you do everything right.
Your HOA Runs Two Funds, Not One
Most small associations think of themselves as having one budget. Accountants see two self-balancing funds, and the distinction drives everything else.
The operating fund pays for day-to-day life: landscaping, management fees, utilities, insurance premiums, pool chemicals, and minor repairs. Money flows in as monthly assessments and flows out within the same year.
The reserve (replacement) fund pays for major repair and replacement of common components: roofs, paving, elevators, siding, pool replastering, entry gates. Money flows in as the reserve slice of each assessment and sits — sometimes for decades — until a component reaches the end of its useful life.
This split is called fund accounting, and it is the standard for common-interest communities. Each fund is its own self-balancing set of accounts with its own assets, liabilities, and fund balance. A transfer between funds is not income to one side and an expense to the other; it is a balance-sheet movement that must be recorded as such. When a reserve study says the association is "62% funded," that percent-funded number is the reserve fund's balance divided by its fully funded target — a ratio that is meaningless if operating bills have been quietly draining the reserve side.
The practical consequence: the split has to happen at collection, not at year-end. If the budget allocates $320 of each $400 monthly assessment to operations and $80 to reserves, then $80 per unit per month should land in the reserve account as dues arrive — not as a lump-sum true-up your successor has to reconstruct from bank statements.
Why One Shared Checking Account Can Violate State Law
Keeping reserves in a separate bank account is not just good hygiene. In many states it is the law, with real consequences for boards that commingle.
Florida prohibits commingling directly. Section 718.111 of the state condominium act provides that reserve and operating funds of the association shall not be commingled unless combined for investment purposes — and even then, the combined funds must be accounted for separately, and the combined balance may never dip below the amount identified as reserves. A board that spends the combined account down past the reserve floor has spent money the statute told it to protect.
California attacks the problem from the spending side. Civil Code section 5510 bars the board from spending reserve money on anything other than the repair, restoration, or replacement of major components (or litigation over those purposes). Section 5520 then requires reserve funds to be held so they are identifiable — which in practice means a separate account or a rigorously segregated ledger. Borrowing is possible but tightly choreographed, as the next section explains.
Washington requires reserve funds to be kept in a segregated account, with any transaction affecting those funds — including writing a check — requiring the signatures of at least two officers or directors.
Even where no statute names the practice, commingling creates three concrete injuries:
- It destroys the audit trail. When operating shortfalls are covered silently from reserves, no minute, resolution, or interfund entry records the movement. An auditor — or a curious homeowner with inspection rights — sees reserve spending with no corresponding reserve purpose.
- It corrupts the percent-funded number. Boards routinely report funding levels to members and lenders. A reserve balance inflated by operating cash, or depleted by operating spending, makes that number fiction.
- It jeopardizes mortgage eligibility. Fannie Mae generally will not buy mortgages in condominium projects that budget less than 10% of assessments toward reserves. Underfunded or unverifiable reserves can make every unit in the building harder to sell and refinance.
The Right Way to Segregate the Money
Segregation has a bank-account half and a bookkeeping half. You need both — a separate account with sloppy books proves nothing, and clean books over one tangled account invite the very transfers you are trying to prevent.
Open a dedicated reserve account. A separate checking, savings, or money-market account titled in the association's name is the baseline. Larger associations ladder certificates of deposit or Treasury bills against the reserve study's spending schedule so money for a 2031 roof earns yield while money for next year's paving stays liquid. Whatever you hold, the governing documents and state law come first: some documents restrict investments to FDIC-insured deposits, and the board should adopt a written investment policy before chasing yield.
Split every assessment at the door. Configure your accounting so each dues receipt posts the operating slice to operating income and the reserve slice to reserve income automatically. The reserve cash then moves to the reserve account on a fixed schedule — weekly or with each deposit batch — rather than whenever someone remembers.
Record every movement between funds as a transfer. Borrowing $15,000 from reserves to cover an insurance deductible is not reserve "spending." It is an interfund loan: a receivable on the reserve fund's books and a payable on the operating fund's. Book it that way the day it happens, with the board authorization referenced in the entry. Transfers recorded weeks later, from memory, are where fraud examiners start reading.
Reconcile both accounts every month. Each bank account gets its own reconciliation, and the reserve reconciliation should tie to the reserve study's funding plan at least quarterly. If the study called for $96,000 in reserve contributions this year and only $71,000 arrived, the board should learn that from the treasurer's report — not from the auditor nine months later.
Allocate interest deliberately. Interest earned by the reserve account belongs to the reserve fund and should be posted there, not swept into operations by default. This matters at tax time, because that interest is taxable income to the association while the assessments that generated it generally are not — which brings us to the IRS.
If You Must Borrow From Reserves, Do It Like a Loan
Emergencies happen: a special assessment fails at the ballot box, an insurance premium doubles, a pipe bursts in December. Most states would rather see a documented temporary transfer than a bounced payroll — but "temporary" and "documented" are doing heavy lifting.
California's procedure in Civil Code section 5515 is the model most treasurers should follow even where their state is silent. As the Davis-Stirling reference on reserve transfers summarizes it, the board must give meeting notice of its intent to consider the transfer, adopt a written finding recorded in the minutes explaining why the transfer is needed and how the money will be restored, and repay the reserve fund within one year. If repayment within a year looks impossible, the board is expected to levy a special assessment to make the reserves whole. An extension requires a fresh finding that delay serves the association's best interests — it is not automatic.
Florida, after its 2025 reforms, gives boards different tools for the same problem: associations may fund reserves through special assessments, loans, or lines of credit approved by a majority of owners, and may pool reserve accounts rather than maintaining a separate account per component. The theme is identical: every path runs through a board vote, owner notice, and a paper trail a stranger could follow.
Three rules keep any interfund borrowing defensible:
- Authorize before moving. The vote precedes the wire, and the minutes state the amount, the reason, and the repayment plan.
- Repay on a visible schedule. Monthly installments back to the reserve account beat a vague promise to "restore when dues arrive."
- Never borrow to paper over a structural deficit. If operations cannot cover operations without raiding reserves two years running, the assessment — not the transfer policy — is the problem.
The Tax Bill Hiding in the Reserve Account
Here is the part that surprises volunteer treasurers: the IRS taxes your reserve account's interest even though it ignores the assessments that filled it.
Most associations file Form 1120-H under Internal Revenue Code section 528. The deal is simple and strict. Member assessments — dues, fees, and special assessments paid by owners as owners — are exempt function income, excluded from tax as long as at least 60% of gross income comes from members and at least 90% of expenditures go to managing and maintaining association property. Everything else the association earns — bank interest, dividends, laundry-room and vending income, rental of association-owned units — is taxable at a flat 30% rate, after a small $100 specific deduction.
That means the interest compounding in a well-funded reserve account is taxable every year, whether or not the association touches it. A $400,000 reserve balance earning 4% generates $16,000 of taxable interest and roughly a $4,800 tax bill — real money that should be budgeted in the operating fund, not discovered by the CPA in March.
Two related traps complete the picture:
- Excess operating assessments can be taxed too — unless the members elect otherwise. When dues collected for operations exceed what operations spent, the surplus is not automatically exempt. Revenue Ruling 70-604 lets the membership vote each year to carry the excess forward to next year's operations (or refund it), keeping it out of taxable income. The election must be made annually by the members, not assumed by the treasurer, and it belongs on the annual-meeting agenda next to the budget vote.
- Commingling does not directly convert exempt assessments into taxable income — but it destroys the proof. The 60% income and 90% expenditure tests are arithmetic, and arithmetic needs clean inputs. When reserve and operating dollars swirl through one account with no interfund entries, reconstructing which expenditures served exempt functions becomes guesswork. The separate account does not create the tax treatment; it substantiates it.
Florida's 2026 Deadline Changed the Stakes
No state illustrates why segregation matters more than ever like Florida. After the Surfside collapse, the legislature required condominium buildings three stories and taller to complete milestone structural inspections and structural integrity reserve studies — then, effective January 1, 2026, barred associations from waiving reserves for structural components the way generations of boards had. The 2025 cleanup bill (HB 913) extended the initial reserve-study deadline to December 31, 2025, with a final backstop of December 31, 2026 for associations completing the study alongside a milestone inspection, and allowed pooling, loans, and lines of credit as funding tools.
The consequence for treasurers is arithmetic: reserve balances across Florida are about to get much larger, and large balances under weak controls are where six-figure mistakes happen. An association that goes from $40,000 to $600,000 in reserves in two years needs segregated accounts, a written investment policy, monthly reconciliations, and a tax budget for the interest — before the money arrives, not after.
Other states are watching. Even if your legislature has not acted, adopting Florida-grade discipline now — funded reserves, separate accounts, documented transfers — is the cheapest insurance against the special assessment your members will blame the board for later.
A Monthly Close Checklist for the Volunteer Treasurer
Tape this inside the treasurer's binder. Fifteen minutes a month prevents nearly every failure mode above:
- Confirm the assessment split posted. Operating and reserve income recorded per the budget ratio; reserve cash moved to the reserve account.
- Reconcile both bank accounts. Operating and reserve reconciliations completed, outstanding items investigated, balances tied to the general ledger.
- Review interfund balances. Any reserve-to-operating transfer shows a matching receivable and payable with board authorization on file; repayment installments current.
- Post reserve interest to reserves. No silent sweeps to operations.
- Compare contributions to the study. Year-to-date reserve funding versus the funding plan; flag shortfalls to the board in writing.
- Report percent funded. One number, every meeting, computed the same way each time.
- Minute the money. Every transfer, assessment, and reserve expenditure approved in open session and recorded in the minutes.
The Community Associations Institute's best-practices guide for financial operations adds the governance layer — two signers on reserve withdrawals, board approval of every reserve expenditure noted in the minutes, and a reserve study refreshed on schedule. Adopt the full set and the books largely keep themselves.
Keep Your Association's Books Audit-Ready
Segregating reserve and operating funds comes down to one habit: every dollar labeled, every movement documented, every month reconciled. Whether you keep the books in a spreadsheet or a full accounting system, maintaining clear, separate fund records is what keeps the board out of legal trouble, the tax return defensible, and the members' trust intact. Beancount.io provides plain-text accounting that gives you complete transparency and control over your financial data — every transfer traceable, every balance version-controlled. Get started for free and see why finance professionals who live in their ledgers are switching to plain-text accounting.
