Accounting rules often care more about consistency than precision per se. As long as the code follows accepted accounting rules (say bankers rounding) choosing

Accounting rules often care more about consistency than precision per se. As long as the code follows accepted accounting rules (say bankers rounding) choosing a known precision works. Often GAAP and other standards don’t define all details for, say amortization, but if you use a scheme the code should always use that method.