HOA Assessment Calculator

Special assessment impact from project cost and unit count.

Legal Disclaimer

This calculator provides general estimates only and does not constitute legal advice. Laws, regulations, and court procedures vary significantly by jurisdiction. Consult a licensed attorney in your area for advice specific to your situation.

DEGRAD

How to Use This Calculator

Enter Total Project Cost and Available Reserves to determine the net assessment amount.
Set Total Units and your Unit Size (sq ft) versus Total Building Size to calculate your ownership percentage.
Enter Payment Plan Months if the HOA is financing the assessment over time, and the interest rate.
Review Your Assessment Amount — your proportionate share based on square footage.
Check the Monthly Payment if financed vs. paying in full to understand budget impact.
Compare against Current Monthly Dues to see total HOA cost impact during the assessment period.

How the result changes with Total Project Cost ($)

Total Project Cost ($)	Your Assessment Amount	Monthly Assessment Payment
5,000,000	$40,833.33	$1,791.42
17,500,000	$145,000.00	$6,361.35
32,500,000	$270,000.00	$11,845.28
45,000,000	$374,166.67	$16,415.21

What each input means

Total Project Cost ($): Total cost of the HOA capital project or repair.
Available Reserves ($): Amount available from the HOA reserve fund.
Total Units in Association: Total number of units in the HOA/condo association.
Your Unit Size (sq ft): Square footage of your individual unit.
Total Building Size (sq ft): Total square footage of all units combined.
Payment Plan (months): Number of months to finance the assessment (0 = pay in full).
Finance Interest Rate (%): Annual interest rate if the assessment is financed.
Current Monthly Dues ($): Your current monthly HOA dues (to show total impact).

What each result means

Your Assessment Amount: Your share of the special assessment based on ownership percentage.
Your Ownership Percentage: Your unit's square footage as a percentage of total building.
Equal Per-Unit Share: What each owner would pay if split equally (for comparison).
Net Assessment (After Reserves): Total project cost minus available reserve funds.
Monthly Assessment Payment: Monthly payment if the assessment is financed.
Total Financed Cost: Total amount paid if financing (principal + interest).
Total Interest Paid: Interest cost of financing the assessment.
New Monthly Total (Dues + Assessment): Current dues plus assessment payment.
Effective Dues Increase (%): Assessment payment as a percentage of current dues.
Reserve Funding Ratio (%): Percentage of the project covered by reserves.

How this is calculated

Worked example, using the default values

Identify Input Parameters
4 parameters
Total Project Cost ($) = 500000, Available Reserves ($) = 100000, Total Units in Association = 120, Your Unit Size (sq ft) = 1200 = 8 input(s) provided
Calculate Your Assessment Amount
Your Assessment Amount = r(ownerShare)
3333.33 = $3,333.33
Calculate Monthly Assessment Payment
Monthly Assessment Payment = r(monthlyPayment)
146.24 = $146.24
Calculate Your Ownership Percentage
Your Ownership Percentage = r(ownershipPct)
0.83 = 0.83%
Calculate Equal Per-Unit Share
Equal Per-Unit Share = r(equalShare)
3333.33 = $3,333.33