HOA Special Assessment Calculator

A special assessment is a one-time charge to owners for a project the reserve fund cannot cover. The amount to raise is the project cost minus the reserves available. Each unit then pays an equal share or a share based on its ownership percentage. Enter your figures to see the shortfall, each unit's share and what a loan would cost per month.

$
The full cost of the work, from a bid or estimate.
$
The part of the reserve fund you can put toward this project. 0 if none.
How the cost is shared
Your governing documents say which method applies.
Homes or units that share the cost.
One unit per line: the unit name, then its percentage. Paste straight from a spreadsheet (two columns), or separate them with a comma. The percentages should add up to 100.
The file stays in your browser. Nothing is uploaded.
Loan (optional)
%
years
Fill in both to see what borrowing the shortfall would cost each unit per month.

Your result

Enter the project cost, the reserves available and the units, and the result appears here.

shortfall to raise

per unit, one time

total loan payment per month

Each unit's share

Unit Ownership One-time share Loan payment per month

How this was calculated

Shortfall = the larger of 0 and ( Project cost - Reserves available ) Equal share = Shortfall / Units Percentage share = Shortfall x Unit ownership % Loan payment = Shortfall x r / ( 1 - (1 + r) ^ -n ) where r = yearly rate / 12 and n = years x 12 Loan per unit = Loan payment / Units, or Loan payment x Unit ownership %

With your inputs

Please note. This is an estimate for planning conversations, not a reserve study. Reserve studies are prepared by qualified professionals following the National Reserve Study Standards.

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Frequently asked questions

How is a special assessment calculated?

Subtract the reserves available for the project from the project cost to get the shortfall. Then divide the shortfall among the units, equally or by each unit's ownership percentage, as your governing documents require.

Should a special assessment be split equally or by percentage?

Your governing documents decide, not the board's preference. Many HOAs split common expenses equally. Many condominiums use each unit's percentage of ownership. Check the declaration before you publish any numbers.

Can an HOA take a loan instead of a special assessment?

Often yes, if the governing documents and state law allow the association to borrow. A loan spreads the cost over years and adds interest. Owners usually repay it through a monthly charge, which this calculator estimates.

Do owners have to vote on a special assessment?

It depends on your governing documents and state law. Many require an owner vote above a set amount, with exceptions for emergencies. Ask your association's attorney before levying one.

How do I avoid special assessments in the future?

Keep the reserve study current and fund reserves in line with it. A low percent funded figure is an early warning that a special assessment is more likely.