Is anyone aware of any tolerance for average daily balance calculations for open-ended credit under Reg Z? On our Equity Line statements, our average daily balance is not computing out the way we thought, and we're trying to determine what the allowable difference is.

No research on this, but I don't recall any tolerance. My concern would be what was disclosed in the contract, what was calculated on your system, why would they be different and the real kicker, what effect has this had on your finance charge calculations?

Luckily, the finance charges are accurate. They've stated that due to rounding and backdating of items after statement cutoff, there is a difference in the avg daily balance.