What it means
A rating compresses a large amount of financial and business analysis into a single symbol. The scale runs from the safest grades at the top down to grades that signal a borrower is already struggling, with a closely watched dividing line between investment grade and everything below it, often called high yield or speculative grade.
Ratings matter because they help set the price of money. A company that slips one notch may see its borrowing cost rise by a fraction of a percentage point, and a slip below investment grade can be far more expensive, because many pension funds and insurers are not permitted to hold sub-investment-grade debt at all.
Agencies build a rating from measurable ratios such as debt to earnings and interest cover, combined with judgement about competitive position, management quality and the country the borrower operates in. The grade is reviewed regularly, and an agency will often signal a likely change first by attaching a negative outlook or placing the borrower on watch.
The word is used more loosely elsewhere in business, which causes confusion in meetings. Banks assign internal risk ratings to their own loan books, procurement teams score suppliers, and equity analysts publish buy, hold or sell ratings on shares, and none of these are comparable with a credit rating.
A rating is an opinion about relative risk, not a guarantee and not a forecast of what a bond will be worth next month. Agencies also move deliberately rather than quickly, so a stable rating does not prove that nothing inside the business has changed.
In practice
Real-world examples.
Example
A packaging group plans a $300,000,000 bond issue. Its BBB rating lets it price the coupon at 5.2%, and the treasurer calculates that a downgrade to BB would have added roughly 1.5 percentage points, or $4,500,000 a year in extra interest. That single letter change would cost more than the group's entire annual marketing budget.
Example
A regional water utility is placed on negative outlook after a large capital programme is approved. Nothing has defaulted and no payment has been missed, but the agency flags that borrowing will grow faster than earnings. The finance director responds by phasing the spending over five years instead of three to protect the grade.
Example
A software firm's bank assigns it an internal risk rating of 5 on a 10-point scale after two quarters of slowing renewals. The rating is never published, but it raises the capital the bank must hold against the loan, so the relationship manager quietly pushes for a higher margin at the next review.
Formula
Calculation
No single formula produces a rating, but two ratios do most of the heavy lifting in the analysis:
Net Debt / EBITDA = (Total debt - Cash) / EBITDA
Interest Cover = EBITDA / Interest expense
Take a mid-sized manufacturer with EBITDA of $50,000,000, total debt of $220,000,000, cash of $20,000,000 and annual interest expense of $12,500,000. Net debt is $220,000,000 - $20,000,000 = $200,000,000, so net debt to EBITDA is $200,000,000 / $50,000,000 = 4.0 times. Interest cover is $50,000,000 / $12,500,000 = 4.0 times. Leverage of 4.0 times with cover of 4.0 times would typically sit in the BB range rather than investment grade. If the company repays $50,000,000 of debt, net debt falls to $150,000,000 and leverage improves to $150,000,000 / $50,000,000 = 3.0 times. Should that support an upgrade that cuts the coupon on the remaining $150,000,000 from 6.5% to 5.75%, the annual saving is 0.75% x $150,000,000 = $1,125,000.Case study
Seen in the real world.
This illustrative example follows Larkfield Ceramics, a fictional tile maker that had carried a BBB- rating for a decade. A debt-funded acquisition pushed net debt to EBITDA from 2.8 times to 4.6 times, and within a month the agency moved the company to BB+ with a stable outlook.
The downgrade cost more than the finance team expected. Two insurance funds sold their holdings because their mandates excluded speculative grade paper, the price of the existing bonds fell, and the refinancing planned for the following year was quoted at 7.4% rather than the 5.9% originally modelled. Larkfield's board agreed a two-year plan of asset sales and a suspended dividend, and the rating returned to BBB- eighteen months later.
Watch out
Common mistakes.
- Treating a rating as a view on the share price. A credit rating is about the ability to repay debt, and a company can be a poor investment for shareholders while remaining a perfectly safe borrower.
- Assuming the letters mean the same thing at every agency. The scales look similar but the definitions and the notch names differ, so quoting a grade without saying who issued it invites confusion.
- Confusing an equity analyst's buy or sell rating with a credit rating. They measure different things for different audiences and frequently point in opposite directions.
Questions
People also ask.
Does a downgrade mean the company is about to fail?
No, it means the assessed risk of not being repaid has risen, and most downgraded borrowers keep paying every instalment on schedule.
Who pays for a credit rating?
In the usual model the borrower pays the agency to be rated, which is why the potential conflict of interest is a long-running debate and why agencies publish their methodologies.
Can a company be rated higher than its own government?
It is possible but unusual, because a borrower is exposed to the same currency, banking system and legal environment as the state it operates in.
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