Fannie Mae's co-op reserve floor takes effect January 4. New York's prewar boards use flip taxes instead.

On March 18, 2026, Fannie Mae's Lender Letter LL-2026-03 established a new reserve standard for co-op projects: starting January 4, 2027, any co-op share loan Fannie Mae purchases must come from a building that budgets at least 15 percent of its annual assessment income toward capital reserves, or from a building with a qualifying reserve study on file. Most NYC prewar co-op boards have funded capital work for decades through flip taxes collected from selling shareholders and one-time special assessments. Neither source counts. New York has no statute requiring co-op boards to maintain a reserve fund at any level.

How NYC prewar co-ops have funded capital reserves for decades.

New York cooperative housing corporations have operated for most of the twentieth century without a statutory reserve requirement. The Business Corporation Law, which governs New York co-ops, imposes no duty on boards to budget a minimum percentage of maintenance income for capital replacement and no requirement that boards commission reserve studies. What has filled that gap in practice is a combination of three capital funding sources.

The first is flip taxes: charges collected from selling shareholders at closing, typically 1 to 3 percent of the sale price or a fixed amount per share. A building with 100 units, a $900,000 median sale price, and annual turnover near 10 percent might collect $90,000 to $270,000 per year in flip taxes. Those funds go directly to the capital reserve account. The second is special assessments: one-time per-unit charges levied when a specific capital project arrives. A $2 million facade repair assessed against 100 shareholders at $20,000 each is a representative example. Special assessments let boards defer capital budget lines until a project is visible. The third is blanket mortgage refinancing: borrowing against the building's underlying mortgage to fund capital work, with debt service absorbed into future maintenance charges. For older buildings with substantially paid-down blanket mortgages, this has been a low-cost capital source.

None of these three mechanisms requires a board to budget a reserve line equal to a fixed percentage of annual maintenance income. NYC prewar co-op boards, managing buildings that predate modern reserve-study methodology, have generally not done so. That history is about to collide with a private-sector standard they had no role in setting.

What Fannie Mae Lender Letter LL-2026-03 requires starting January 4.

Fannie Mae Lender Letter LL-2026-03 amended the Fannie Mae Selling Guide to raise the minimum budgeted allocation to replacement reserves from 10 to 15 percent of the annual total assessment income for project-level review. The change applies to condo projects and cooperative projects. For co-ops, "assessment income" means the aggregate annual maintenance charges collected from all shareholders.

The co-op project review is the point of entry. Before Fannie Mae will purchase a share loan from a lender, the lender must conduct a full co-op project review confirming that the building meets Fannie Mae's standards. As of August 3, 2026, that review no longer accepts a limited or streamlined path. For reserve qualification, LL-2026-03 sets two acceptable methods: the building budgets at least 15 percent of annual assessment income toward capital reserves, or the building has a qualifying reserve study on file showing adequate funding at the recommended level.

A co-op with 200 units paying $2,400 per month in maintenance has annual assessment income of roughly $5.76 million. To pass the 15 percent floor, the operating budget must show at least $864,000 per year going to capital reserves. That is a budget line, not a bank balance.

Why flip taxes and special assessments do not satisfy the floor.

Fannie Mae's 15 percent test reads the operating budget, not the capital reserve account balance. A co-op that collects $5 million in annual maintenance and deposits $350,000 to a capital reserve line (7 percent) falls short of the 15 percent floor even if it also receives $600,000 in annual flip taxes deposited to the same account.

The reason is structural: flip taxes are collected from sellers at closing, not from the annual maintenance assessment. They appear nowhere in the co-op's operating budget as a budgeted income line. A lender performing a full project review reads the board's adopted operating budget. A flip tax does not appear on the line labeled "replacement reserves." Fannie Mae's project review calculation does not add flip taxes to budgeted reserves when computing the 15 percent ratio.

Special assessments face the same treatment. A $2 million special assessment levied and collected in a single year is not a budgeted reserve line; it is a one-time receivable for a specific project. Fannie Mae does not treat special assessments as qualifying reserve funding for the annual ratio test. The result: a NYC prewar co-op that has never budgeted 15 percent of maintenance income to a capital reserve line and has relied on flip taxes, special assessments, and blanket mortgage refinancing will fail Fannie Mae's project test starting January 4, 2027, unless it can present a qualifying reserve study.

What a qualifying reserve study requires, and what disqualifies one.

A reserve study is a capital planning document prepared by a licensed engineer, architect, or credentialed reserve specialist. It inventories a building's common elements, estimates their remaining useful life and replacement cost, and recommends a funding level. For Fannie Mae purposes, the study must satisfy four conditions:

• Be no more than 36 months old at the time of the loan application.
• Include a site inspection of the building's common elements (desktop-only or update-only studies do not qualify).
• Use the threshold or full funding method, not the baseline method. Fannie Mae expressly prohibited baseline-funded studies beginning August 3, 2026.
• Show that the building is currently at, or on a planned path to, the recommended funding level.

Many NYC co-op buildings have never commissioned a reserve study. New York law imposes no requirement that they do. A co-op board that has operated on special assessments and flip taxes for 40 years may have no engineer-certified capital inventory on file. A reserve study for a mid-size NYC co-op typically costs $4,000 to $9,000. Commissioning one, receiving the report, reviewing it with counsel, and adopting a budget change to reach the recommended funding level takes months. The managing agent coordinating that process needs no state license in New York.

Albany has not set a reserve floor for co-ops or condos.

Senate Bill S7600 and Assembly Bill A8945, introduced in the 2025-2026 legislative session, would have required every condo and co-op association to commission a reserve study within one year of passage and to budget at the recommended funding level. Both bills were referred to committee in January 2026. Neither received a committee hearing or a floor vote before the legislature adjourned June 18, 2026. To our knowledge as of September 2026, the 2027 session has no identified sponsors.

The reserve study bills are one instance of a repeating pattern. Over ten consecutive legislative sessions, bills addressing managing-agent licensure, a co-op ombudsperson, a ground lease rent cap, and reserve study mandates have been introduced and referred to committee without a hearing. In each case, the gap in state law is filled, incompletely, by a private standard: Fannie Mae's guidelines, the Levandusky business judgment rule (which shields board financial decisions from owner challenge), or a managing agent's proprietary contract.

Fannie Mae's standard fills the reserve gap more directly than the others. Buildings that fail the project review lose access to conventional financing for unit buyers. That is not a civil penalty with an appeal path. It is a financing market exit that arrives building by building, loan by loan, with no advance notice from any state agency.

Bottom line.

Starting January 4, 2027, a NYC co-op board whose operating budget allocates less than 15 percent of annual maintenance income to capital reserves and that has no qualifying reserve study on file is 100 days from a Fannie Mae financing problem. Share loan lenders will run a full project review. Flip taxes will not appear on the budget line Fannie Mae examines. Special assessments from prior years will not count. The managing agent advising the board on its budget holds no state license. Albany has set no floor. Fannie Mae has.

Co-op boards have two options before January 4. The first is to amend the current fiscal-year budget to add a replacement reserve line equal to at least 15 percent of total annual maintenance income, which for most mid-size NYC co-ops means adding $400,000 to $900,000 per year in budgeted reserve deposits. The second is to commission a qualifying reserve study, adopt its recommended funding level, and document both for the lender's project review file. The second path takes longer than most boards expect and requires more board action than a single vote. Both paths start now.

Primary sources: Fannie Mae Lender Letter LL-2026-03 (Mar. 18, 2026); Fannie Mae Selling Guide § B4-2.1-03; NY Senate Bill S7600 (2025-26 session); NY Assembly Bill A8945 (2025-26 session).

Companion resources: Fannie Mae's 15% reserve floor arrives in January — the condo version · What your reserve study's funding method means after August 3 · Every NYC condo loan goes to full review on August 3 · Issue: No reserve fund requirement · Issue: Reserve study credentialing gap · The managing-agent bill with no sponsor going into 2027