what is the earnings credit rate ecr 
the earnings credit rate ecr is a daily calculation of interest that a bank pays on customer deposits the earnings credit rate is often correlated with the u s treasury bill t bill rate ecrs are rates that banks impute to offset service charges because depositors leave balances in non interest bearing accounts the bank will apply an ecr on those balances and use that as a credit for services for example a corporate treasurer with a 250 000 collected balance receiving a 2 ecr would earn 5 000 to offset services ecr is often credited automatically understanding the earnings credit ratebanks may use ecrs to reduce fees customers pay for other banking services these might include checking and savings accounts debit and credit cards business loans additional merchant services such as credit card processing and check collection reconciliation and reporting and cash management services e g payroll ecrs are paid on idle funds which reduce bank service charges customers with larger deposits and balances tend to pay lower bank fees ecrs are visible on most u s commercial account analyses and billing statements banks may have great discretion in determining the earnings allowance while the earnings credit rate can offset fees depositors must note that they are only being charged for services they use not in combination with others history of the earnings credit ratethe notion of an earnings credit rate originated with regulation q reg q which prohibited banks from paying interest on deposits in checking accounts set up for transactional purposes 1 following the 1933 glass steagall act many hoped this practice would limit loan sharking and other predatory actions 2the act subsequently supported consumers in releasing funds from checking accounts and shifting them to money market funds following regulation q many banks decided to offer soft dollar credits on these non interest bearing accounts to offset banking services financial instruments with a higher yield than ecrs include money market funds or even relatively safe and liquid bond funds typically the ecr is applied against collected balances not ledger or floating balances lockbox accounts and other depository accounts have float since it takes time for the deposits to clear while these items are floating the funds are not available collected balances are what you have cleared and have available to transfer or invest special considerations