I work with a recordkeeper whose calculated loan payment never seems to match the one that I calculate. I generally use a standard loan amortization schedule (a spreadsheet and I also coded one in Python), and have cross-checked it on multiple online calculators (those calculators almost always match the one I get, perhaps off by a penny).
I asked the recordkeeper about it and got a very vague answer - that it depends on the interest rate and on the time period.
Has anyone else experienced this, and if so, have you gotten an answer to the discrepancies?
Part of the reason I am asking is because I like to generate my own amortization schedule and when a payment is off by even $.10, it adds up over 5 years and makes my schedule wonky even if I try to override the payment amount. I really want to know what is going on with their calculator.