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How to Calculate "Unused" Cash In Checking Account


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    To start, I believe this is unwise. it is good to have a safety buffer on your bill pay account for numerous unforeseen reasons. I carry a 1 month float in my checking.  but I will still try to answer your question.  
    My advice is to work your budget weekly, not monthly.
    I have mapped my finances mostly the way you describe, i have a lovely spreadsheet i am working on making available to others that shows not only monthly expense but focuses on weekly in/out. obviously your expense are not all calculated and settled at the last day of the month, they are variable week to week(first week being mortgage/rent day), also they are usually not fixed rate(power, gas, water etc all fluctuate for me) so i don't think you will maximize your savings to the dollar by automated way. this is why i carry a float.
    My budget philosophy is to have the money in my account on on April 1 to cover any bill that is due APR 1st thru 7th. and have on hand the 7th money to cover every bill due 8th-14th. and so forth. this means(in my case and budget) that money deposited on Mar 19 and 26 is being used to pay bills due on Apr 1-7(mortgage/rent due on the 1st is greater than 1 paycheck).

    I would have to actively manage these expenses every week in advance, to optimize my savings account down to the $1 . 

    if you budget for 4 pay checks a month, actively manage your upcoming bills in advance by the week of the month the bill is due, retain the money for the upcoming weeks bills in your checking acct and transfer the excess immediately to your savings, this will get you as close as possible. it will also provide you with 4-5 extra paychecks over your budget every year(assuming you are paid weekly) that can go straight into interest earning savings.

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