Fannie Mae's 15% Reserve Rule — and the Way Around It

Quick Answer: Fannie Mae’s Selling Guide (B4-2.2-02) requires a condo project’s budget to allocate at least 10% to replacement reserves to pass Full Review. Lender Letter LL-2026-03 (March 18, 2026) raises that to “a minimum of 15% of the annual budgeted income assessment” for loan applications dated on or after January 4, 2027. A project that fails becomes unwarrantable: buyers can’t get conventional financing, sales fall through, and values follow. The documented alternative is a reserve study — the Selling Guide lets a lender accept a project below the threshold if it has a study “completed within three years” by “an independent third party that has specific expertise” whose recommendations the budget funds. But two changes hit sooner, on August 3, 2026: lenders using that flexibility must verify the budget includes “the highest recommended reserve allocation amount in the reserve study,” and “lenders are no longer permitted to use the baseline funding method.” If your study’s cheapest scenario is baseline funding, it stops working as a lending document this August — not in 2027.

There’s a version of this that arrives as a phone call from a furious owner whose buyer just walked, three days before closing, because the lender declined the project.

Nobody on the board saw it coming, because nothing visible changed. The building is fine. The assessments are paid. What changed is a number in a mortgage underwriting guideline, and it just made every unit in the community harder to sell.

Here’s what’s happening and what a board can actually do about it.

What “warrantable” means, and why it decides your property values

Fannie Mae and Freddie Mac buy most conventional mortgages in the country. Before a lender will write a loan on a condo, the project has to qualify — not just the borrower, not just the unit. That’s project review.

Pass, and your owners’ buyers can get ordinary 5%-down conventional financing.

Fail, and the project is unwarrantable. Buyers are pushed toward portfolio loans with bigger down payments and worse rates, or toward cash. Your buyer pool shrinks to the people who can absorb that, and they know it, and they bid accordingly.

This is the part boards underestimate: project eligibility is not paperwork. It is the single largest external factor in what your owners’ units are worth, and the board controls it.

The rule today: 10%

Fannie Mae’s Selling Guide, section B4-2.2-02, requires that the project budget allocate replacement reserves of “at least 10% of the budget.”

Not 10% of your building’s replacement cost. Not 10% of what your reserve study says you need. Ten percent of the annual budget, set aside for capital expenditures and deferred maintenance.

Plenty of associations don’t hit it, and many don’t know they don’t, because nobody checks until a unit goes into escrow and a lender pulls the budget.

What’s changing

Lender Letter LL-2026-03, issued March 18, 2026, says it directly:

“We are revising our reserve allocation requirement for capital expenditures and deferred maintenance from a minimum of 10% to a minimum of 15% of the annual budgeted income assessment.”

The effective date is specific: “Lenders must comply with this requirement when utilizing the Full Review process for all loan applications dated on or after Jan. 4, 2027.” It’s tied to the loan application date, not the closing date — so it starts biting deals in progress before it starts biting sales.

Fannie Mae isn’t coy about why. The letter states it is “focused on mitigating risks of inadequate protection against property loss, including underinsurance and underfunded condo projects.” Post-Surfside, that’s an easy position to hold and a hard one to argue with. The letter also notes these changes are “in alignment with Freddie Mac and in coordination with U.S. Federal Housing (FHFA)” — Freddie’s parallel document is Bulletin 2026-C, issued the same day — so this isn’t a Fannie-only quirk you can shop around.

There’s a second change that matters just as much and is getting less attention: Limited Review is being retired for loan applications dated on or after August 3, 2026.

Limited Review was the streamlined path — lower loan-to-value deals could skip most of the project scrutiny. The letter says established projects previously eligible for it “must now be reviewed using the Full Review process or, when applicable, the Waiver of Project Review process.” With it gone, projects that never faced the full reserve test are about to. A lot of boards are going to meet this rule for the first time in the same window the bar goes up.

The way around it: a reserve study

Here’s the part most coverage buries, and it’s the part that actually helps you.

You do not have to hit the percentage. The Selling Guide provides an alternative for projects that fall short. A lender may accept the project if a reserve study demonstrates that:

“the project has adequate funded reserves that provide financial protection for the project equivalent to Fannie Mae’s standard reserve requirements”

and

“the project’s funded reserves meet or exceed the recommendations included in the reserve study.”

In other words: the 10% (soon 15%) is a default for projects that haven’t done the work. If you’ve actually studied your building and you’re funding to what the study says, Fannie Mae will take the study over the blunt percentage.

That is a genuinely sensible policy. A percentage of the budget is a crude proxy for whether a building is financially prepared. A reserve study is the real measurement.

The conditions — read these carefully

The alternative isn’t a loophole. It has teeth.

The study must be current. The lender may use a study or study update “provided it has been completed within three years of the date on which the lender approves the project.” A study from 2021 is not going to save you in 2027. If your association’s study is gathering dust, it isn’t just non-compliant with your state’s law — it’s no longer usable for this.

It must be independent. The guide requires the study be “prepared by an independent third party that has specific expertise,” naming credentialed reserve study professionals, construction engineers, CPAs specializing in reserve studies, and professionals with “demonstrated knowledge of and experience in completing reserve studies.” The treasurer’s spreadsheet does not qualify, however good it is.

And from August 3, 2026, you must fund the highest recommendation. This is the change with the sharpest edge, and it arrives before the 15% does. LL-2026-03:

“We are updating this policy to clarify when lenders use this flexibility, they must verify the project’s budget includes the highest recommended reserve allocation amount in the reserve study to adequately cover the costs identified.”

Reserve studies typically present multiple funding scenarios — baseline, threshold, full funding — each with a different contribution schedule and a different level of risk. Historically a board could adopt a scenario and argue it met the study’s recommendations. Now you don’t get to pick the comfortable one. If your study offers a $200,000/year plan and a $310,000/year plan, the number that keeps you eligible is $310,000.

And baseline funding is dead for this purpose. This is the sentence reserve study professionals should read twice, because it names a specific method and kills it:

“Lenders are no longer permitted to use the baseline funding method which is the option that allows the reserve cash balance to approach but never fall below zero.”

Baseline funding is the cheapest legitimate scenario in the toolkit — you keep the reserve balance above zero and no more. Plenty of studies present it, and plenty of boards adopt it precisely because it’s the smallest number on the page. As of August 3, 2026, a lender cannot rely on it. If that’s the scenario your association funds, your study stops working as a lending document this summer, and nobody is going to call to tell you.

Which means the study your board commissions is no longer just a planning document. It’s the document that sets the number you must fund to keep your owners’ units financeable.

One thing that did not change: the letter says “all other requirements related to replacement reserves and the review of budget adequacy remained unchanged.” The three-year recency rule and the independent-professional requirement still stand as written in B4-2.2-02.

What this means for how you buy a reserve study

Two things follow, and boards should think about both before the next RFP.

A cheap study is now expensive. If the study is thin — components missed, useful lives copied from a national table instead of measured, a funding plan that doesn’t survive a lender’s read — it fails you at exactly the moment you need it. The scenario where a board saves $1,500 on a study and then can’t use it for project eligibility is not hypothetical, and $1,500 is a rounding error against what unwarrantability does to sale prices.

Timing matters more than it used to. Three years is the outer limit, measured to the lender’s approval date, not to your board meeting. If your study is two and a half years old and a sale is coming, you’re closer to the edge than you think. Boards that let studies lapse are going to discover the deadline through a failed escrow.

What to do now

Find out where you actually stand. Pull this year’s budget and calculate what percentage goes to reserves. If it’s under 15%, you’re in the group this affects. Most boards have never run this number.

Check the date on your reserve study. Not the date you last discussed it — the date it was completed. If it’s approaching three years, start the update now rather than after someone’s sale falls apart.

Find out which funding scenario you actually adopted. Open the study and look at which plan your budget follows. If the answer is baseline funding — or if nobody on the board knows — that’s now urgent, because a lender can’t rely on baseline after August 3, 2026. This is the single item on this list most boards cannot answer from memory.

Ask your manager whether any recent sales hit project review problems. This is a leading indicator, and managers often know before boards do.

Then decide deliberately. You have two paths: raise assessments enough to hit 15%, or maintain a current study and fund its highest recommendation. For a lot of associations the second is both cheaper and more defensible — you’re funding what your building actually needs rather than a number an underwriter picked. But it only works if the study is current, independent, and good.

Where we come in

This is the work. Our full reserve study inventories every component, measures condition and remaining useful life on site rather than borrowing numbers from a table, and builds a funding plan that holds up when a lender reads it — which, as of 2027, some lender will.

If your study is aging out, or you’ve never had one and you’re staring at a 15% budget line you can’t reach, that’s the conversation to have now, while there’s still time to act on the answer rather than react to it.

For the underlying requirements in California specifically, see our guide to California’s reserve study law. For what happens when a study’s assumptions turn out to be wrong, see the dangers of an underfunded reserve.

Not sure whether your association clears the bar? Contact Apex Reserve Group for a complimentary 30-minute consultation. We’ll look at your budget and your study’s date and tell you where you stand.

This article summarizes Fannie Mae’s published guidance in general terms and is not legal, financial, or lending advice. Project eligibility determinations are made by lenders. Confirm current requirements and effective dates with your lender or association counsel.