This is important because government borrowing finances the gap between public spending and tax revenues.
As interest rates have risen from the ultra-low levels that prevailed for much of the last decade, investors are demanding higher yields to hold government debt, increasing further the burden on public finances.
For policymakers, the arithmetic is becoming challenging.
Higher bond yields raise both the cost of refinancing maturing debt and the funding of new deficits, forcing difficult choices between raising taxes, reducing spending or borrowing even more.
At the same time, rising debt-servicing costs can crowd out more productive investment in areas such as infrastructure, housing and transport, potentially weakening long-term economic growth.
Without a credible plan to stabilise debt levels, there is a danger of a self-reinforcing cycle.
Concerns about fiscal sustainability can push borrowing costs higher, worsening budget deficits and further undermining investor confidence.
Bond markets are often willing to tolerate high debt burdens, but they can become far less forgiving when they sense governments lack a clear strategy for restoring order to the public finances.
Adding to the challenge, governments are no longer competing solely with one another for capital as technology companies, often with strong balance sheets, global revenue streams and long-term growth plans are increasingly tapping debt markets to finance their enormous levels of investment in artificial intelligence and data centre infrastructure.
To be clear, neither the UK nor the US faces an imminent funding crisis, but bond markets appear to be sending a clear message that fiscal discipline is becoming more valuable, and access to investor capital can no longer be taken for granted.
Capital at risk. All views expressed are those of the author and should not be considered a recommendation or solicitation to buy or sell any products or securities.
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