HOA reserve funds are generally not taxable at the federal level. When the association files Form 1120-H under Internal Revenue Code Section 528, every dollar members pay in — including the portion earmarked for reserves — counts as “exempt function income” and stays out of taxable income entirely. The one piece that does get taxed is the interest or dividends the reserve balance earns while it sits in the bank or an investment account. That part is taxable no matter which return the HOA files.
Why the Form the HOA Files Decides Everything
An HOA has two choices each year. It can file Form 1120-H under Section 528, or it can file Form 1120 as a regular corporation. The choice is made annually, so a board can switch methods if the numbers change.1Internal Revenue Service. Instructions for Form 1120-H (2025)
Under Section 528, member dues, fees, and assessments are defined as exempt function income and excluded from the association’s taxable income.2Office of the Law Revision Counsel. 26 USC 528 Certain Homeowners Associations That shield covers regular monthly dues and any special assessment collected to build up the reserve fund. Nothing more needs to happen on the return to keep reserve contributions out of income. This is the main reason most HOAs file 1120-H, and it is the reason reserve fund contributions are usually a non-issue at tax time.
To use Form 1120-H in a given year, the association has to pass three tests:
- At least 60% of gross income must come from member dues, fees, and assessments.
- At least 90% of expenditures must go toward managing, maintaining, and caring for association property.
- Substantially all units or lots must be used as residences.1Internal Revenue Service. Instructions for Form 1120-H (2025)
Associations most often fail the 60% test when a one-time non-member payment — a cell tower signing bonus is the classic example — pushes outside income above 40% of the year’s total. In a year like that the HOA has to file Form 1120 instead, and the tax treatment of reserve contributions is no longer automatic.
Interest and Investment Earnings on Reserves Are Taxable
Reserve money that sits in a money market account, CD, or bond fund produces interest and dividends, and that income is non-exempt. It is taxable under either filing method.
Under Form 1120-H, taxable income equals non-exempt income minus directly connected deductions, plus a flat $100 specific deduction.2Office of the Law Revision Counsel. 26 USC 528 Certain Homeowners Associations The rate is a flat 30% for condominium management associations and residential real estate management associations, and 32% for timeshare associations.1Internal Revenue Service. Instructions for Form 1120-H (2025) The 30% rate is higher than the 21% corporate rate, but the calculation is simple and the shield over member assessments is airtight, which is why most boards accept the trade.
Many directors assume that because reserve assessments are protected, the earnings on those reserves are protected too. They are not. If the reserve account produced $5,000 in interest, the HOA owes tax on it.
When Reserve Contributions Can Become Taxable
Reserve contributions lose their automatic federal shield in two situations: when the HOA has to file Form 1120, and when the association mishandles the funds after collecting them.
Form 1120 Filers Must Document Reserves as Capital Contributions
When an HOA files Form 1120 as a regular corporation, all income is initially gross income, including reserve assessments.3Internal Revenue Service. Instructions for Form 1120 (2025) There is a path to exclude reserve contributions, but the association has to earn it. The IRS has recognized that special assessments collected for identified future capital replacements, held in a separate bank account, can be treated as non-taxable capital contributions rather than income. That treatment requires paperwork: the governing documents or a board resolution should designate the specific assessment as a capital contribution for a named project, and the money should sit in a dedicated reserve account.
A general assessment that gets split between operating and reserve accounts after collection, with no written designation beforehand, is hard to defend as a capital contribution. If the designation is missing, the IRS can treat the full reserve assessment as taxable income.
Form 1120 filers also run into IRC Section 277, which caps member-related deductions at the amount of member income received that year. Excess member deductions carry forward instead of offsetting other income.4Office of the Law Revision Counsel. 26 USC 277 Deductions Incurred by Certain Membership Organizations in Transactions With Members A year with a large special assessment and slow spending can produce phantom taxable income because of this mismatch.
Moving Reserve Money Into Operations
Dipping into reserves to cover an operating shortfall has different consequences depending on the filing method. Under Form 1120-H, moving reserve dollars into operations does not by itself create taxable income, as long as the transfer is authorized by the governing documents and approved by the board. The assessments were classified as exempt function income when collected, and that status carries over.
Under Form 1120 the risk is real. Because reserve funds were excluded from income as capital contributions, moving them into operating can taint that treatment. The IRS may view the transfer as evidence that the funds were never truly committed to a capital purpose, which pulls the earlier exclusion into question.
Commingling Reserve and Operating Cash
Keeping reserves and operating money in a single bank account is a red flag under either filing method. Separate accounts make it straightforward to show that reserve assessments were collected, held, and spent for their designated capital purpose. Many state laws also require HOAs to maintain reserves in a separate account, so commingling can create tax exposure and a state-law violation at the same time.
Operating Surpluses Transferred to Reserves
Reserves also grow from a different source: leftover operating money at year-end. When an HOA spends less on operations than it collected, that surplus is still member income, and if the board does nothing, it can turn into taxable income on the return. Revenue Ruling 70-604 is the framework for handling it.
The association has three options for an operating surplus:
- Apply it against the next year’s assessments.
- Rebate it to the members who paid.
- Transfer it into the reserve fund.
The procedural catch trips a lot of boards. Rev. Rul. 70-604 requires that the decision be made at a meeting of the membership, not by the board alone.5Internal Revenue Service. Information Letter Regarding Revenue Ruling 70-604 The members vote on what happens with the excess, the vote has to happen before the fiscal year ends, and the minutes should record the dollar amount and the chosen use. Skipping the member vote, or holding it after year-end, can let the IRS treat the entire surplus as taxable income. The cleanest fix is to make the vote a standing item on the annual meeting agenda.
State Taxes Follow Their Own Rules
Federal treatment is only part of the picture. Most states with an income tax also require an HOA return, and the rules do not always track Section 528. Some states offer a parallel exemption; others treat HOAs as ordinary corporations at the state level regardless of the federal election. Minimum taxes or franchise fees can apply even when the association owes no state income tax on operations. Confirming the state requirements with a local CPA matters, because filing cleanly with the IRS does not carry over to the state return.