A cooperative housing corporation is a company that owns an entire residential building; the people who live there buy shares in that company and receive a proprietary lease giving them the exclusive right to occupy a specific apartment. You are not buying real estate. You are buying stock, plus a long-term lease from the corporation that owns the walls around you. That distinction drives almost everything else about co-op living, from how you finance the purchase to what you can deduct at tax time to what happens when you try to pass the apartment to your children.
What You Actually Own
The corporation holds the deed to the land and building. As a shareholder, you hold two documents: a stock certificate showing your ownership stake in the corporation, and a proprietary lease granting you the exclusive right to occupy a specific unit for as long as you hold those shares and follow the lease terms. The number of shares tied to each apartment generally tracks the unit’s size and desirability, and your voting power and financial obligations scale with your share count.
Because the shares are personal property rather than real estate, a co-op interest behaves legally more like corporate stock than like a house. You never own the physical apartment. The corporation does.
What You Pay Every Month
Every shareholder pays a monthly maintenance fee, sometimes called carrying charges. This is not rent, even though you are technically a tenant of the corporation. It is your proportional share of the building’s total operating costs, and it usually bundles together several things a homeowner would otherwise pay separately:
- Property taxes on the building, paid as a single parcel and divided among shareholders
- Payments on the building’s underlying mortgage, if the corporation carries one
- The corporation’s master insurance policy on the structure and common areas
- Heat, hot water, and sometimes other utilities
- Staff salaries for doormen, porters, and superintendents, plus routine repairs
- Contributions to the reserve fund for future capital projects
When reserves fall short of a large expense such as a roof replacement or elevator modernization, the board can levy a special assessment. That is a one-time charge, based on your share count, and it is rarely optional.
The Underlying Mortgage
Many co-ops carry a blanket mortgage on the entire building, and shareholders collectively service that debt through their maintenance fees. This creates a risk that does not exist for condo or single-family owners. If the corporation defaults on its building-wide loan, every shareholder’s investment is exposed. In a foreclosure, the building can convert to a rental property, proprietary leases can be cancelled, and shareholders can lose the equity in their units. That is one reason boards look so closely at buyers’ finances.
If You Fall Behind
Missing maintenance fees or refusing to pay a special assessment is a default under your proprietary lease. The corporation can lien your shares and, after following the procedures in the lease, cancel your occupancy rights and sell your shares at a lien foreclosure sale.1The New York Times. Failure to Pay Maintenance The worst-case outcome is losing both the apartment and any equity in the shares.
How Financing Works
Because co-op shares are personal property, the loan you take to buy them is not a mortgage in the traditional sense. It is a share loan (sometimes called a co-op loan). Instead of recording a mortgage against a deed, the lender files a UCC financing statement giving public notice of its claim against your stock certificate and proprietary lease.2Fannie Mae. Co-op Share Loan Documentation Requirements The lender typically holds the original stock certificate and an assignment of the proprietary lease signed in blank. If you default, the lender sells the shares and lease under the Uniform Commercial Code, much like repossessing any other secured collateral.
Fewer lenders offer share loans than conventional mortgages. Fannie Mae will purchase co-op share loans, but only when the unit is a principal residence or second home; investment properties are excluded.3Fannie Mae. Loan Eligibility for Co-op Share Loans Loan-to-value math can also be more complicated, because it may need to reflect your proportional share of the building’s blanket mortgage.
Tax Deductions Under Section 216
Co-op shareholders can claim meaningful tax deductions, but only if the corporation meets the IRS definition of a “cooperative housing corporation” under Section 216 of the Internal Revenue Code. Losing that status for even one tax year eliminates the deductions for every shareholder in the building.
How the Corporation Qualifies
To qualify under Section 216, the corporation must have a single class of stock, and each stockholder’s right to occupy a unit must flow solely from owning that stock. The corporation must also meet at least one of three tests for the tax year:4Office of the Law Revision Counsel. 26 U.S. Code 216 – Deduction of Taxes, Interest, and Business Depreciation by Cooperative Housing Corporation Tenant-Stockholder
- Income test: at least 80% of the corporation’s gross income comes from tenant-stockholders.
- Square footage test: at least 80% of the building’s total square footage is used or available for residential use by tenant-stockholders.
- Expenditure test: at least 90% of the corporation’s spending goes toward acquiring, managing, or maintaining property for tenant-stockholders’ benefit.
The income test draws the most scrutiny because commercial rent from a ground-floor restaurant or retail space counts against the 80% threshold. If commercial income pushes tenant-stockholder income below 80%, the corporation can try to satisfy one of the other two tests instead.
What Shareholders Can Deduct
When the corporation qualifies, shareholders can deduct their proportionate share of two items the corporation pays: real estate taxes on the building and land, and interest on the corporation’s mortgage debt.4Office of the Law Revision Counsel. 26 U.S. Code 216 – Deduction of Taxes, Interest, and Business Depreciation by Cooperative Housing Corporation Tenant-Stockholder The corporation calculates each shareholder’s proportionate share and reports it on Form 1098, the same form used for conventional mortgage interest.5Internal Revenue Service. Instructions for Form 1098 (12/2026) You claim these as itemized deductions, as if you had paid them directly.
The principal portion of the underlying mortgage that your maintenance fees help pay down is not deductible. Only the interest and the real estate taxes qualify. New buyers often assume the entire maintenance payment is deductible; it is not.
If you financed your share purchase with a personal co-op share loan, the interest on that loan is also deductible as mortgage interest, because the tax code treats debt secured by co-op stock as if it were secured by a residence. Your combined deductible mortgage interest — from your share loan and from your proportionate share of the building’s mortgage — is subject to the same cap as any other home mortgage interest: $750,000 of acquisition debt for loans taken out after December 15, 2017, or $375,000 if married filing separately.6Office of the Law Revision Counsel. 26 U.S. Code 163 – Interest
Capital Gains When You Sell
Selling co-op shares is treated the same as selling any other primary residence. If you owned the shares and lived in the apartment for at least two of the five years before the sale, you can exclude up to $250,000 of gain from your income, or $500,000 if you are married filing jointly. Section 121 addresses co-op shareholders specifically: the ownership test applies to how long you held the stock, and the use test applies to how long you actually lived in the apartment.7Office of the Law Revision Counsel. 26 U.S. Code 121 – Exclusion of Gain From Sale of Principal Residence If you fall short of the two-year requirement because you moved for work, health, or certain unforeseen circumstances, a partial exclusion may apply. You also cannot claim the exclusion if you already used it on another property sale within the prior two years.
Board Approval, House Rules, and Subletting
Almost every co-op purchase is contingent on board approval. Boards require a detailed application package: personal financial statements, two to three years of tax returns, employment verification, bank statements, and reference letters. The financial bar is often stricter than what a mortgage lender would require, and many buildings expect substantial post-closing liquidity. After the paperwork, the board typically schedules an interview.
Boards have broad discretion. Under current practice, a board can decline a purchaser without providing any explanation. That discretion is not unlimited: the federal Fair Housing Act prohibits rejecting an applicant based on race, color, religion, sex, familial status, national origin, or disability, and many jurisdictions add further protected categories.8Office of the Law Revision Counsel. 42 U.S. Code 3604 – Discrimination in the Sale or Rental of Housing The absence of any required explanation makes enforcement difficult.
Once you are in, the proprietary lease and house rules govern daily life. Two areas tend to be tightly restricted. Subletting almost always requires board approval, and many buildings limit how often or how long you can rent out your unit. A common structure permits subletting for two out of every five years, with a minimum period of owner-occupancy before subletting is allowed at all.9Habitat Magazine. FAQ Check: Subletting Your Co-op Renovations beyond cosmetic work also require written board approval, because anything touching plumbing, electrical systems, load-bearing walls, or the building envelope affects property the corporation owns.
Inheriting or Transferring Shares
Co-op shares pass through an estate like other assets, by will, trust, or intestate succession. Inheriting the shares does not automatically give the heir the right to move in. The board retains approval authority over transfers, including those triggered by death, and an heir who cannot meet the board’s financial standards may be denied occupancy. The usual outcome in that case is a forced sale to a board-approved buyer, with the proceeds flowing to the estate. Some proprietary leases limit the board’s ability to unreasonably withhold consent for transfers to financially responsible family members, but this varies building by building.
Moving shares into a revocable living trust during your lifetime, a routine step for other property, generally requires board approval and is not guaranteed. Some buildings prohibit trust ownership outright. Others allow it only if you remain the occupant and the named beneficiary. Review the proprietary lease and bylaws before starting any trust transfer, and expect the board to require a formal application and possibly a financial review of the beneficiary.
How This Differs From a Condo
Condo owners hold a deed to their unit plus a fractional interest in common areas, can generally sell to any qualified buyer, and finance with a standard mortgage. Co-op shareholders own stock and a lease, need board approval to buy or sell, and rely on a smaller pool of share-loan lenders. Co-ops often cost less per square foot because the approval process and financing limits shrink the buyer pool, and monthly carrying charges can be lower in buildings whose underlying mortgage was locked in years ago on favorable terms. The offset is control: boards can restrict subletting, renovations, and transfers in ways that would be unusual in a condo. Which trade-off is right depends on how much you value autonomy over your unit against the financial screening that helps keep the building stable.