Do they repay their debt from income generation or they just refinance it?

The short answer is both, but they primarily refinance the principal.

For a massive, investment-grade corporation like Comcast, debt is not treated like a household mortgage that eventually needs to be paid down to zero. Instead, debt is viewed as a permanent, strategic layer of their capital structure.

Here is how they balance income generation and refinancing:

1. Refinancing (Rolling Over) the Principal

When a major bond matures—say, a $5 billion chunk coming due in 2027—Comcast usually does not drain its bank accounts to pay it off. Instead, they issue a new $5 billion bond, take the cash from the new investors, and hand it to the old investors.

This is known as "rolling over" the debt. As long as the company remains highly profitable, Wall Street is more than happy to keep buying their new bonds.

2. Using Income to Pay the Interest

Comcast uses its massive income generation—specifically its Free Cash Flow (FCF), which usually sits between $13 billion and $15 billion annually—to easily pay the ongoing interest on the debt.

Because their debt is mostly fixed at low rates, the annual interest payments are a highly manageable expense that barely dents their total cash flow.

3. Why Not Pay It All Off?

It might seem logical to use their $15 billion in annual cash flow to wipe out the debt over a decade, but financially, that would be a bad move for the company for a few reasons:

• The Tax Shield: Corporate interest payments are tax-deductible. Having debt actually lowers Comcast's annual tax bill.
• Better Returns Elsewhere: If Comcast has a bond charging them 3% interest, they are better off keeping that debt and using their cash to build a new theme park that generates a 15% return.
• Shareholder Rewards: Wall Street prefers that Comcast use its extra cash to buy back stock and pay dividends, which drives up the stock price, rather than paying off cheap debt.

4. When Do They Actually Use Cash to Pay Down Principal?

Comcast does use its actual income to pay down debt under one specific circumstance: Deleveraging after massive acquisitions.

When Comcast bought Sky in 2018 for nearly $39 billion, their debt spiked to uncomfortable levels. To appease the credit rating agencies (like Moody's and Fitch) and avoid getting downgraded, Comcast temporarily paused its stock buybacks. They took billions of dollars of their generated income and aggressively paid down the principal until their debt-to-EBITDA ratio fell back down to a safe level (around 2.4x). Once they hit that target, they resumed refinancing and buying back stock.

How do high interest rates affect them?