Calculation of Discount or Premium Amort
Even if Interest Paid Once a Year, would need to properly report Interest Expense and Balances at each Quarterly B/S Date due to passage of time.
Calculations per $1000 vs. For Total
For per Bond Calculation, just calculate as if Issue was $1000.
Cash Interest (Payable) = Stated Rate x $1000 if annual.
If calculate for full issue (say $800,000 or 800 Bonds), then would need to divide by 800 at end end to get the PER Bond or PER $1000 answer.