Calculate and budget loan repayments

You can use a Manual Entry driver tab to manage your loan data and calculate the loan repayment amount and the loan interest amount per period. You can then use that data as the basis of a loan financing mini-driver for connecting the Profit and Loss and Balance Sheet.

The video shows an example of how to do this.

The example uses the following data:

  • Loan Amount: $1,000,000

  • Repayment Term: 10 Years (120 Months)

  • Interest Rate: 6.25%

  • Start Month: December

The Manual Entry tab setup is as follows:

Row

Action

Details

Row

Action

Details

Interest Rate

Enter the interest rate

6.25% per month

Remaining Loan Amount

Use a formula to reference to the Loan Amount on the Balance Sheet tab

($1,000,000 in the first year, starting in December)

Interest

Use a formula to calculate the interest

= Remaining Loan Amount * ((Interest Rate / 100) / 12)

Monthly Payment Amount Total

Use this logic to calculate the monthly payment:

= (P * r * (1 + r)^n) / ((1 + r)^n - 1)

Where:

P is the loan amount (principal)
r is the monthly interest rate (annual interest rate divided by 12)
n is the total number of payment periods (number of years multiplied by 12)

= (1000000 * 0.0625 / 12 * (1 + 0.0625 / 12)^120) / ((1 + 0.0625/12)^120 – 1)

Principal

Use a formula to calculate the principal

= Monthly Repayment Amount Total - Interest