What the National Debt Conversation Should Teach Us About Our Own

I read something recently that stuck with me. Charles Schwab's research team published a piece called "America's New Debt Reality," and buried in the middle of it is a simple equation that economists use to figure out whether a borrower, in this case the U.S. government, is heading toward trouble or has room to breathe.

It comes down to two things. How much are you borrowing beyond what you bring in. And is the cost of that borrowing growing faster than your ability to pay it off.

That is it. That is the whole framework. And once I read it, I could not stop thinking about how directly it applies to the conversations I have every week with buyers and homeowners across Contra Costa, Alameda, and Santa Clara counties.

The federal government just crossed a line that used to be treated as a warning sign. Debt held by the public passed 100 percent of GDP this summer, and the total federal debt is closing in on 40 trillion dollars. For a long time, this did not spook anyone because borrowing was cheap and growth was strong enough to outrun it. That cushion is gone. Interest rates on the debt have roughly doubled since 2021, and interest payments on the national debt now cost more than the entire defense budget. When the cost of carrying debt grows faster than your income grows, the math stops being forgiving. It starts compounding against you instead of for you.

I bring this up not to talk politics or scare anyone about the economy. I bring it up because I think this is exactly the mindset every buyer and every homeowner needs when they look at their own household. The same equation applies at your kitchen table.

Here is what I mean.

Borrowing is not the problem. Structural borrowing is.

The Schwab piece makes an important distinction. For decades, the government's debt would spike during a recession or a war, then shrink back down once things stabilized. That is normal and manageable. What worries analysts now is that the borrowing has become structural, meaning the gap between income and spending does not close even when times are good.

The same distinction matters for a household. Taking on a mortgage to buy a home you can genuinely afford is healthy borrowing. It is an investment, and your income and the home's value both have room to grow into it over time. But when your monthly obligations, mortgage, car payments, credit cards, and everything else, permanently outpace what you bring home, that is structural. It does not correct itself when things get a little easier. It just keeps compounding.

Before you commit to a home, I always encourage buyers to ask themselves honestly whether the payment fits comfortably into a normal month, not just a great month. If it only works when everything goes right, that is worth pausing on.

Watch the relationship between your rate and your growth.

Schwab's whole argument centers on something economists call r versus g, the interest rate compared to the growth rate. When your income or your asset's value grows faster than the cost of your debt, you are gaining ground. When the cost of your debt grows faster than your income, the debt gains ground on you instead.

For a homeowner, this shows up in very practical ways. If you locked in a mortgage rate a couple of years ago, you are in a strong position, since your rate is fixed while your income has room to rise. But if you are carrying a lot of variable rate debt, a HELOC, credit cards, an adjustable rate loan, the math can turn against you quickly if rates stay elevated. I have talked with several homeowners this year in Walnut Creek and San Ramon who used HELOCs during the low rate years and are now feeling the pinch as those balances reprice. It is a good reminder to look at what portion of your monthly obligations are locked in versus floating.

No single number tells you if you are in trouble, but the trend does.

One thing I appreciated about the Schwab piece is that it pushes back on the idea that there is a single debt to GDP number that triggers a crisis. Japan carries far more debt than we do and has never defaulted, while other countries have defaulted at much lower levels. What matters more is the trend and who is holding the debt.

I would tell buyers the same thing about their own finances. There is no magic debt to income ratio that guarantees safety. Lenders use guidelines, but your own comfort matters more than a number on a worksheet. What I care about with clients is the direction things are heading. Is your debt shrinking relative to your income over time, or is it creeping up every year regardless of how well you are doing. That trend line tells you more than any single snapshot.

Build in room for the unexpected.

The Schwab piece includes a scenario where a recession forces a sudden surge in government borrowing, and debt climbs to its highest levels in the whole analysis. The lesson is that a household or a government that is already stretched thin has far less room to absorb a shock, whether that is a job loss, a medical bill, or a market downturn.

This is why I always encourage buyers here in the East Bay and South Bay to think past the purchase price and think about their reserves. A home that fits your budget today should still fit if your circumstances change for a few months. That cushion is not about being pessimistic. It is about giving yourself room to breathe if life throws something unexpected your way, which it eventually does for all of us.

I know the national debt conversation can feel abstract and far removed from your own life. But the underlying lesson is not abstract at all. Borrow for the right reasons, keep an eye on whether your rate is working with you or against you, and always leave yourself some room. Those same principles that economists use to evaluate a country's fiscal health are honestly some of the best guardrails you can use for your own.

If you are thinking about buying a home in Contra Costa, Alameda, or Santa Clara County and want to talk through what a comfortable and sustainable budget looks like for your situation, I am always happy to sit down and walk through it with you. No pressure, just an honest conversation about what makes sense for your life.