HOA Reserve Fund Calculator: Are You Saving Enough?

Underfunded reserves are the top cause of surprise special assessments — enter your numbers for a quick estimate of how much to save.

Number of units / homes Current reserve balance ($) Est. cost of major components to replace ($) Roofs, paving, painting, pools, elevators, etc. over their life. Average remaining life of those components (years) Annual budgeted assessment income ($) Total dues the budget collects in a year — the base Fannie Mae's reserve percentage is measured against.

A simplified straight-line estimate for planning only. Reserve adequacy depends on a real reserve study of each component. Lenders (Fannie Mae) and several states now set minimums.

How this estimate works

This calculator uses a simplified straight-line model: it looks at the replacement cost of your major common components, their remaining useful life, and how much you've already saved, then estimates a fully-funded target and the contribution needed to stay on track. It's a planning starting point — not a substitute for a professional reserve study, which prices every component individually.

The Fannie Mae and Freddie Mac reserve floor

Enter your annual budgeted assessment income and the calculator also shows the contribution as a percentage of that income — the way Fannie Mae and Freddie Mac measure reserve adequacy for condo project eligibility. The minimum allocation rises from 10% to 15% of budgeted assessment income for loan applications dated on or after January 4, 2027.

An association below the floor can still qualify by funding at the highest recommended level of a reserve study completed or updated within the last three years. A bare-minimum funding model does not count. Projects that miss both tests can be classified non-warrantable, which blocks conventional financing for every buyer in the building.

Why reserves matter more in 2026

Several states — Florida most aggressively — now bar condo associations from waiving reserves and require structural reserve studies. Fannie Mae and Freddie Mac have tightened condo lending where reserves are thin. Under-saving no longer just risks a bad year; it can make units unsellable. See our 2026 Florida condo law guide.