The 15% Reserve Rule: How Fannie Mae's 2027 Standard Changes Condo Lending

Published July 30, 2026 · 6-minute read · By the CondoScores team at RentSpire

If you're on a condo board or planning to buy a condo in the next year, there's a new number you need to know: 15%. Starting in 2027, that's the minimum share of your HOA's budget that must go toward reserves if you want your building to keep qualifying for conventional mortgages.

Here's exactly what's changing, when it takes effect, and what to do about it.

What Is the 15% Reserve Rule?

The rule comes from Fannie Mae Lender Letter LL-2026-03, issued March 18, 2026, which updates the condo project standards in Fannie Mae's Selling Guide (Fannie Mae Lender Letter LL-2026-03). The letter revises the reserve allocation requirement for capital expenditures and deferred maintenance from a minimum of 10% to a minimum of 15% of the annual budgeted assessment income (Fannie Mae Lender Letter LL-2026-03).

The Effective Date: January 4, 2027

This is critical: lenders must comply with the increased 15% requirement, when using the Full Review process, for all loan applications dated on or after January 4, 2027 (Fannie Mae Lender Letter LL-2026-03). The trigger is the loan application date — not the closing date or the note date.

How the 10% Rule Works Today

Under the current Fannie Mae Selling Guide, lenders performing a Full Review must confirm that the HOA's projected budget provides for funding of replacement reserves that is at least 10% of the budget (Fannie Mae Selling Guide B4-2.2-02, Full Review Process). To determine this, the lender divides the annual budgeted replacement reserve allocation by the association's annual budgeted assessment income, which includes regular common expense fees (Fannie Mae Selling Guide B4-2.2-02).

Certain types of income are excluded from that calculation, including incidental income the project doesn't rely on for ongoing operations, income for utilities individual owners would normally pay, income already allocated to reserve accounts, and special assessment income (Fannie Mae Selling Guide B4-2.2-02).

What Changes on January 4, 2027

The math stays the same — reserve allocation divided by budgeted assessment income — but the bar rises from 10% to 15% (Fannie Mae Lender Letter LL-2026-03). For an association with $500,000 in annual budgeted assessment income, that's the difference between needing $50,000 allocated to reserves and needing $75,000 — a 50% jump in required reserve contributions.

The Reserve Study Alternative Gets Tighter Too

Fannie Mae has long allowed lenders to accept a reserve study instead of a flat percentage, provided the study demonstrates the project has reserves equivalent to Fannie Mae's standard requirement (Fannie Mae Selling Guide B4-2.2-02). That option isn't going away, but it's getting stricter, and sooner than the 15% change.

Effective for loan applications dated on or after August 3, 2026, when a lender uses a reserve study to justify a lower reserve allocation, the study must show the project's budget includes the highest recommended reserve allocation amount identified in that study (Fannie Mae Lender Letter LL-2026-03).

Just as important: the baseline funding method, which allows a reserve cash balance to approach — but never fall below — zero, is no longer permitted (Fannie Mae Lender Letter LL-2026-03). Associations that have historically used a bare-minimum reserve study strategy will need to fund at whatever level the study actually recommends as its highest option.

Under the existing Selling Guide, an acceptable reserve study must also have been completed within three years of the lender's project review date, prepared by an independent third party with reserve-study expertise — a reserve study professional, construction engineer, CPA specializing in reserve studies, or similarly qualified professional (Fannie Mae Selling Guide B4-2.2-02).

Why This Is Happening Now

These reserve changes arrive alongside a bigger structural shift: Fannie Mae is retiring the "Limited Review" process, the streamlined path that let many established condos skip a detailed financial review. That retirement applies to loan applications dated on or after August 3, 2026, and pushes far more transactions into Full Review, where the reserve test actually applies (Fannie Mae Lender Letter LL-2026-03). In other words, more buildings than ever will actually have their reserve percentage checked, right as the required percentage goes up.

What Counts as "Reserves" Under the Rule

Reserves under this test mean funds set aside for capital expenditures and deferred maintenance: think roofs, elevators, paving, painting, and major mechanical systems that wear out on a predictable schedule (Fannie Mae Selling Guide B4-2.2-02). Routine operating-budget line items — landscaping, staff salaries, everyday utilities — don't count toward the reserve calculation.

Which Condos Are Exempt

Fannie Mae doesn't require a full project review — and therefore doesn't apply this reserve test — to several categories of properties, including detached condo units, units in two-to-four-unit condo projects, and most units in planned unit development (PUD) projects (Fannie Mae Selling Guide, General Information on Project Standards). If your association falls into one of these categories, the reserve percentage test generally won't apply to your building.

What Condo Boards Should Do Before January 2027

1. Calculate your current reserve percentage. Divide your budgeted annual reserve contribution by your budgeted annual assessment income (not total expenses, and not special assessments).
2. Get or update a reserve study. If you plan to rely on a study instead of hitting 15% outright, make sure it's been completed within the last three years by a qualified independent professional, and that your budget matches its highest recommended funding level, not a baseline minimum (Fannie Mae Selling Guide B4-2.2-02; Fannie Mae Lender Letter LL-2026-03).
3. Build the 2027 budget around the higher number now. Since the trigger is the loan application date, buyers applying on or after January 4, 2027 will be measured against the new 15% threshold, even if your fiscal year budget was adopted earlier.
4. Communicate with owners early. A 50% increase in reserve contributions may require a dues increase or a funding plan — decisions that take time and member buy-in.
5. Keep your documentation lender-ready. Full Review means lenders will request budgets, reserve studies, and financial statements in detail.

Frequently Asked Questions

When exactly does the 15% reserve requirement take effect? For loan applications dated on or after January 4, 2027, using the Full Review process (Fannie Mae Lender Letter LL-2026-03).

Is 15% based on total expenses or just assessment income? It's based on the association's annual budgeted assessment income, which includes regular common expense fees — not total operating expenses and not special assessment income (Fannie Mae Selling Guide B4-2.2-02).

Can our association still use a reserve study instead of hitting 15% directly? Yes, but the rules tightened for loan applications dated on or after August 3, 2026. The study must support the highest recommended reserve allocation identified in it, and the baseline funding method (letting the reserve balance approach zero) is no longer accepted (Fannie Mae Lender Letter LL-2026-03).

What happens if our association doesn't meet the new 15% minimum and doesn't have a qualifying reserve study? The project risks being deemed ineligible for Fannie Mae financing, since a Full Review checks reserve funding as part of the eligibility requirements (Fannie Mae Selling Guide B4-2.2-02).

Check Where Your Association Stands Today

Waiting until January 2027 to find out your building's reserve percentage falls short is a risky strategy. CondoScores.com gives condo boards and owners a free warrantability score that estimates how your building measures up against Fannie Mae's reserve, delinquency, and insurance standards. Run your numbers today at condoscores.com and start planning before the new rule takes effect.