Credit Analysis, Bond Ratings and Financial Ratios

This page reviews some fundamental credit analysis principles in corporate finance and project finance.  Ratings are simulated using financial ratios and business risk profiles from Standard and Poors. Different credit analysis ratios are contrasted such as the DSCR in project finance and the Debt to EBITDA ratio in corporate finance.  A file that summarizes the difference between corporate finance is introduced first.  Then analysis that you can use to put in benchmarks and come up with simulated credit ratings is described.

There are a few files that you can download that work through the use of financial ratios and business conditions to simulate bond ratings. These files include data provided by S&P on financial ratios, bond ratings and S&P subjective estimates of business risk.  With given financial ratios and given subjective estimates of business risk, the ratings can be estimated using the INTERPOLATE function.


Excel File that Includes Analysis of Debt Beta from Analysis of Credit Spreads and Evaluation of Simulated Bond Ratings

Excel File that Includes Data on Financial Ratios, Bond Ratings and Business Risk from Standard and Poor's

Excel File that Includes Methods for Computing RORAC for Banks With Probability of Default and Other Statistics

Using Financial Ratios to Simulate Bond Ratings

In using the financial ratios and the financial ratios to simulate bond ratings, you need the financial ratio and the business risk estimate.  The screenshots below illustrate some of the manners in which S&P presents business risk and the key financial ratios that are used. The first screenshot below illustrates the various ratios used without any accounting for business risk.  You cannot use this for simulating bond ratings (although Damarodan does) because it does not contain any business risk.  You can find this in the excel file that had the S&P data.  It is sometimes difficult to update these files because S&P seems to be obsessed with making things totally un-understandable.



The two screenshots below shows S&P presentations where the credit rating does not only depend on the financial ratio but it also depends on the the business risk.  The business risk is defined as miniminal modest, aggressive etc. in the first screenshot. In the second screenshot that S&P uses for utility companies, the business risk has an explicit rating. Unlike Damarodan’s simplistic spreadsheet, these business risk profiles must be accounted for in evaluating the credit rating.  Numbers are assigned to the different business risks so that a rating can be assigned.


The next two screenshots illustrate how to mechanically compute the bond ratings given a business risk profile and given the financial ratios. The lookup function is not very useful because it makes a step function and when you want to weight different financial ratios it is not very good.  Instead, the INTERPOLATE function is good to use.



Contrast between Credit Analysis in Corporate Finance and Project Finance

In project finance it is often appropriate to assert that the source of repayment for a loan is cash flow.  For corporate finance this is generally not the case. If a company is growing, it will continue to grow debt on the balance sheet and re-finance its loans. When lenders lose confidence in the quality of a companies assets, management or ability to generate future cash flow, the lenders may refuse to make new loans.  This is when bankruptcies like for Enron, Worldcom, Lehman Brothers and GM have occurred.  For these companies it is difficult to find obvious declines in cash flow or get much information from the DSCR ratio.

In the very simple model, you can put in different levels of volatility in both the corporate finance model and the project finance model.  The volatility takes one simple equation in excel to simulate — NORMSINV(RAND()).  The project finance model is simulated with volatility cash flow which is the fundamental theory behind the DSCR.  Of course, in the real world cash flow does not follow a normal distribution.  For the corporate model, the EBITDA and the future capital expenditures are modeled using a similar equation.  Here the financial ratios at the time of re-financing cash flow can be examined to evaluate whether lenders are willing to re-finance.  The corporate finance analysis is more difficult to simulate in a similar manner to project finance even though both are driven by volatility.  The manner in which I have attempted to simulate the different approaches is illustrated in the except below.  The associated file with the simple model that you can download is included as well.



The second excerpt demonstrates the model.  For the corporate finance simulation I assume the loans must be re-financed after a given period and I compute the EV/EBITDA ratio at that period.  The DSCR does not make sense (nor LLCR or PLCR).  If the Debt to EBITDA ratio grows too much you can assume that the corporate finance cannot be re-financed.  The spreadsheet items for this are illustrated below.



Simple Credit Simulation Used to Demonstrate Short-cut Keys in Excel

Power Point Slides the Provide and Overiview of Credit Analysis and the Associated Modelling Issues


Credit Benchmark Ratios and Simulated Credit Ratings

Credit analysis has become a mixture of magic potion and BS like many other things in finance. Banks now buy a program from Moody’s that spits out a credit rating.  You end up spending a lot of time manipulating soft inputs related to management to push the rating to your desired level.  To go back to old fashioned credit analysis where you determine credit ratings through analysis of various financial ratios I have included a couple files below that you can download.


Power Point Slides that Work Through Various Different Financial Ratios Used in Credit Analysis and the Underlying Theory

Power Point Slides that Work Through Option Pricing Models and Other Mathematical Models Used in Credit Analysis



Short-term Analysis with Risk of Value Decline in Inventories and Changes in Demand