I'm trying to understand the question.
Example: TIS says Super Savings account will earn 0.08% if it has a minimum $1,000 balance every day of the cycle. If it doesn't meet the criteria, it earns 0.06%, the same as a Regular Savings account.
Account 1234 dips below $1,000 (has a $900 balance) so you should pay them 0.06% for that quarter, per your TIS.
But you actually paid them 0.04%? If so, then I would say yes, you need to go back and recalculate the interest and pay them what you said you would pay them in your disclosures, 0.06%.
If I have misunderstood the question, please clarify.
I do not know what you mean by "Does the allowable variance apply to disclosures?"
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