I am the treasurer of an HOA with 900 members. The amount of money you currently collect is not the measure of what you should collect. Therefore, the current fees can not be used to estimate what you need to have in reserves. Your HOA should commission a Reserve Study to determine the correct amount you need to set aside for your reserves. Then you add that to the money needed for day to day operations to arrive at the amount you need to collect from your members in fees.
The quotes for a reserve study can run as much as $5,000 and should be done a minimum of once every 5 years. We recently use, a very good small firm for under $1000, Marcus Castle, Castle Reserve Studies, 480-250-9339, http://www.castlereservestudies.com.
Good luck. Call with any questions.
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Central AZ Real Estate