Free tool for HOA and condo boards. No email required.
HOA Reserve Fund Calculator
Is your reserve fund on track, or is a special assessment coming? Enter your balance, your yearly contribution and the big items you replace. You get percent funded today, the year the money runs short, and the contribution that fixes it, using the same 30-year math a reserve study uses.
Components you replace
Example values for a mid-size condo. Replace them with your own study’s numbers.
Percent funded today
45.2%Fair
You hold $350,000 against a fully funded balance of $774,950: the share of every component’s cost that has already been used up.
At $60,000 a year, the fund runs out in 2035 and falls as low as -$968k. That gap is what usually becomes a special assessment: about $16,133 per unit.
$95,833
Minimum yearly contribution so the fund never runs out ($133 per unit per month)
$136,478
Yearly contribution to reach 100% funded by year 30 ($190 per unit per month)
Want someone to check these numbers?
Send them to us. We reply by email with what looks off and what a full reserve study would change.
Methodology
The math, in the open
This is the cash flow method reserve professionals use. Each component’s used-up share of its cost adds up to the fully funded balance. Every replacement in the next 30 years is inflated to the year it falls due. Interest is earned on the average balance each year, and after a replacement the component starts wearing out again from zero.
fully funded balance = sum of cost x (useful life - remaining life) / useful life percent funded = reserve balance / fully funded balance replacement cost = today's cost x (1 + inflation) ^ years until due baseline = smallest contribution where the balance never drops below $0 full funding = smallest contribution that also ends year 30 at 100% funded
How to read your result
- Under 30% funded: weak. A large repair is likely to need a special assessment or a loan.
- 30% to 70%: fair. Usually workable, but one surprise can push the fund short.
- 70% and up: strong. Special assessments are rare at this level.
- The red line crossing zero is the year your current contribution stops covering the bills.
The numbers here are only as good as the costs and lives you enter. A reserve study measures quantities on site, prices them at local rates and is signed by a credentialed preparer. If your state requires one, if you are in a Florida condo building three or more stories tall, or if your last study is more than three years old, use this to prepare for that conversation, not to replace it.
For reserve study professionals
Preparing studies for a living?
AI drafting for reserve studies
From site visit to full draft in hours
Inspector notes and photos go in. A component inventory, 30-year funding plans and a branded draft report come out, in your format, ready for your analyst to review.
The engine underneath
Handwritten notes and photos into data
How field notes, photo sets and PDFs become structured, checked data, with anything uncertain sent to a person instead of guessed.
FAQ
HOA reserve funds, answered
How much should an HOA have in reserves?
Enough to cover the share of each major component that has already worn out. That figure is the fully funded balance, and your reserve balance divided by it is your percent funded. Associations above roughly 70% funded rarely need special assessments; below 30%, they usually do. A dollar rule of thumb ignores what you actually own, which is why this calculator asks for your components.
How are HOA reserve funds calculated?
Each component gets a replacement cost, a useful life and a remaining life. The used-up share of its cost (years used divided by useful life, times cost) adds up to the fully funded balance. A 30-year cash flow then inflates each replacement to the year it falls due, adds contributions and interest, and shows whether the balance ever drops below zero.
What is the difference between baseline and full funding?
Baseline funding is the smallest contribution that keeps the reserve balance above zero every year. Full funding aims to reach 100% funded over time. Baseline is cheaper today but leaves no cushion when a cost comes in high or a component fails early. Many boards pick a plan between the two, often called threshold funding.
Does this replace a professional reserve study?
No. A reserve study includes a site inspection, a full component inventory with measured quantities and local costs, and a credentialed preparer. Some states require one, and Florida requires a structural integrity reserve study for many condo buildings. This calculator shows where your current numbers point so you know what questions to ask.
What do lenders look for in condo reserves?
Fannie Mae and Freddie Mac review condo budgets before backing mortgages in a building, and a budget that puts too little into reserves can make units harder to finance. Fannie Mae has required at least 10% of budgeted assessment income to go to reserves, and its Lender Letter LL-2026-03 raises that to 15% for loan applications dated on or after January 4, 2027. A current reserve study can justify less only if the budget adopts the study's highest recommended funding level.
Is the data I enter stored anywhere?
No. The calculator runs in your browser. We only receive your numbers if you choose to send them to us with your email.
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