Debt crisis from low fertility and transfers from young to old
Rich and middle-income countries made long-duration promises in a lower-rate, younger, less fragmented world. That world is disappearing. Tracking the gap betwe
Updated today.
The Promises
Total transfer payments to persons — Social Security, Medicare, Medicaid, and other entitlements at SAAR.
$1.2T
Trend YoY growth is +14.3%, accelerating by 70 bps/year over the last 25Y. Deviations have remained below trend for 6 consecutive periods. Latest: +6.5%, 7.7 pp below trend, a 0.73σ deviation. The latest YoY reading is boosted by 6.7 pp due to an easy comparison base from Jan '25. At current levels, YoY would fall to +1.6% by Jul '26 as comparisons tighten.
Level
YoY %
y = −3.3% + 70 bps/yr · t
Deviation from trend
Total federal government spending at SAAR — the numerator of the fiscal equation.
$7.7T
Trend YoY growth is +7.0%, accelerating by 6 bps/year over the last 25Y. Latest: +5.0%, 2.0 pp below trend, a 0.13σ deviation. At current levels, YoY would fall to +1.3% by Jul '26 as comparisons tighten.
Level
YoY %
y = 5.4% + 6 bps/yr · t
Deviation from trend
Total federal tax and fee revenue at SAAR — the denominator of the fiscal equation.
$5.9T
Trend YoY growth is +7.6%, accelerating by 25 bps/year over the last 25Y. Latest: +11.4%, 3.9 pp above trend, a 0.53σ deviation. The latest YoY reading is depressed by 55 bps due to an tough comparison base from Oct '24.
Level
YoY %
y = 1.3% + 25 bps/yr · t
Deviation from trend
The Gap
Annual fiscal balance — negative values show spending exceeding revenue. Structural deficits above 3% compound debt.
-5.8%
Trend YoY growth is +0.4%, accelerating by 5.7 pp/year over the last 24Y. Latest: +0.4%, 6 bps above trend, a 0.02σ deviation.
Level
YoY Change (bps)
y = −1.0% + 6 bps/yr · t
Deviation from trend
Total public debt relative to economic output — the headline solvency metric.
122.6%
Trend YoY growth is +2.2%, slowing by 3.3 pp/year over the last 25Y. Deviations have remained below trend for 9 consecutive periods. Latest: +1.1%, 1.1 pp below trend, a 0.18σ deviation.
Level
YoY Change (bps)
y = 3.0% − 3 bps/yr · t
Deviation from trend
Publicly-held federal debt — the standard headline measure that excludes intragovernmental holdings — relative to household net worth.
16.8% of net worth
Trend YoY growth is +0.2%, slowing by 1 bps/year over the last 24Y. Deviations have remained below trend for 4 consecutive periods. Latest: -0.2%, 45 bps below trend, a 0.51σ deviation.
Level
Change (pp)
y = 0.5% − 1 bps/yr · t
Deviation from trend
Debt Service
The cost of long-duration government borrowing — where promises meet market pricing of fiscal risk.
5.0%
Trend YoY growth is +0.3%, accelerating by 2.8 pp/year over the last 25Y. Latest: +0.2%, 13 bps below trend, a 0.91σ deviation.
Level
YoY Change (bps)
y = −0.4% + 3 bps/yr · t
Deviation from trend
Long-duration bond prices — falls when markets demand higher compensation for fiscal risk.
$85.4
Trend YoY growth is -6.9%, slowing by 1.4 pp/year over the last 9Y. Deviations have remained above trend for 166 consecutive periods. Latest: +2.0%, 8.9 pp above trend, a 4.1σ deviation. The latest YoY reading is depressed by 6.2 pp due to an tough comparison base from May '25.
Level
YoY %
y = 5.8% − 1.4 pp/yr · t
Deviation from trend
Foreign appetite for U.S. debt — declining share signals eroding external confidence in fiscal sustainability.
$9.2T
Trend YoY growth is +3.0%, slowing by 53 bps/year over the last 24Y. Deviations have remained above trend for 8 consecutive periods. Latest: +5.5%, 2.5 pp above trend, a 0.38σ deviation. The latest YoY reading is depressed by 13.2 pp due to an tough comparison base from Jul '24.
Level
YoY %
y = 15.9% − 53 bps/yr · t
Deviation from trend
The Squeeze
Share of working-age adults in the labor force — declining participation shrinks the tax base funding entitlements.
61.9%
Trend YoY growth is -0.1%, accelerating by 1.0 pp/year over the last 25Y. Latest: -0.6%, 54 bps below trend, a 1.1σ deviation.
Level
YoY Change (bps)
y = −0.3% + 1 bps/yr · t
Deviation from trend
Inflation is the stealth resolution mechanism — it erodes the real value of fixed-dollar promises.
330.3Index
Trend YoY growth is +3.2%, accelerating by 5 bps/year over the last 25Y. Latest: +3.3%, 13 bps above trend, a 0.07σ deviation. The latest YoY reading is boosted by 76 bps due to an easy comparison base from Mar '25. At current levels, YoY would fall to +2.8% by May '26 as comparisons tighten.
Level
YoY %
y = 1.9% + 5 bps/yr · t
Deviation from trend
Key Insight
The fiscal arithmetic has already crossed the threshold where the deficit is structural, not cyclical, and the only reason there is not yet a visible crisis is that the bond market still buys Treasuries and the labor force has not yet contracted enough to force the issue.
Debt crisis from low fertility and transfers from young to old
Rich and middle-income countries made long-duration promises in a lower-rate, younger, less fragmented world. That world is disappearing. Tracking the gap betwe
Updated today.
The Promises
Total transfer payments to persons — Social Security, Medicare, Medicaid, and other entitlements at SAAR.
$1.2T
Trend YoY growth is +14.3%, accelerating by 70 bps/year over the last 25Y. Deviations have remained below trend for 6 consecutive periods. Latest: +6.5%, 7.7 pp below trend, a 0.73σ deviation. The latest YoY reading is boosted by 6.7 pp due to an easy comparison base from Jan '25. At current levels, YoY would fall to +1.6% by Jul '26 as comparisons tighten.
Level
YoY %
y = −3.3% + 70 bps/yr · t
Deviation from trend
Total federal government spending at SAAR — the numerator of the fiscal equation.
$7.7T
Trend YoY growth is +7.0%, accelerating by 6 bps/year over the last 25Y. Latest: +5.0%, 2.0 pp below trend, a 0.13σ deviation. At current levels, YoY would fall to +1.3% by Jul '26 as comparisons tighten.
Level
YoY %
y = 5.4% + 6 bps/yr · t
Deviation from trend
Total federal tax and fee revenue at SAAR — the denominator of the fiscal equation.
$5.9T
Trend YoY growth is +7.6%, accelerating by 25 bps/year over the last 25Y. Latest: +11.4%, 3.9 pp above trend, a 0.53σ deviation. The latest YoY reading is depressed by 55 bps due to an tough comparison base from Oct '24.
Level
YoY %
y = 1.3% + 25 bps/yr · t
Deviation from trend
The Gap
Annual fiscal balance — negative values show spending exceeding revenue. Structural deficits above 3% compound debt.
-5.8%
Trend YoY growth is +0.4%, accelerating by 5.7 pp/year over the last 24Y. Latest: +0.4%, 6 bps above trend, a 0.02σ deviation.
Level
YoY Change (bps)
y = −1.0% + 6 bps/yr · t
Deviation from trend
Total public debt relative to economic output — the headline solvency metric.
122.6%
Trend YoY growth is +2.2%, slowing by 3.3 pp/year over the last 25Y. Deviations have remained below trend for 9 consecutive periods. Latest: +1.1%, 1.1 pp below trend, a 0.18σ deviation.
Level
YoY Change (bps)
y = 3.0% − 3 bps/yr · t
Deviation from trend
Publicly-held federal debt — the standard headline measure that excludes intragovernmental holdings — relative to household net worth.
16.8% of net worth
Trend YoY growth is +0.2%, slowing by 1 bps/year over the last 24Y. Deviations have remained below trend for 4 consecutive periods. Latest: -0.2%, 45 bps below trend, a 0.51σ deviation.
Level
Change (pp)
y = 0.5% − 1 bps/yr · t
Deviation from trend
Debt Service
The cost of long-duration government borrowing — where promises meet market pricing of fiscal risk.
5.0%
Trend YoY growth is +0.3%, accelerating by 2.8 pp/year over the last 25Y. Latest: +0.2%, 13 bps below trend, a 0.91σ deviation.
Level
YoY Change (bps)
y = −0.4% + 3 bps/yr · t
Deviation from trend
Long-duration bond prices — falls when markets demand higher compensation for fiscal risk.
$85.4
Trend YoY growth is -6.9%, slowing by 1.4 pp/year over the last 9Y. Deviations have remained above trend for 166 consecutive periods. Latest: +2.0%, 8.9 pp above trend, a 4.1σ deviation. The latest YoY reading is depressed by 6.2 pp due to an tough comparison base from May '25.
Level
YoY %
y = 5.8% − 1.4 pp/yr · t
Deviation from trend
Foreign appetite for U.S. debt — declining share signals eroding external confidence in fiscal sustainability.
$9.2T
Trend YoY growth is +3.0%, slowing by 53 bps/year over the last 24Y. Deviations have remained above trend for 8 consecutive periods. Latest: +5.5%, 2.5 pp above trend, a 0.38σ deviation. The latest YoY reading is depressed by 13.2 pp due to an tough comparison base from Jul '24.
Level
YoY %
y = 15.9% − 53 bps/yr · t
Deviation from trend
The Squeeze
Share of working-age adults in the labor force — declining participation shrinks the tax base funding entitlements.
61.9%
Trend YoY growth is -0.1%, accelerating by 1.0 pp/year over the last 25Y. Latest: -0.6%, 54 bps below trend, a 1.1σ deviation.
Level
YoY Change (bps)
y = −0.3% + 1 bps/yr · t
Deviation from trend
Inflation is the stealth resolution mechanism — it erodes the real value of fixed-dollar promises.
330.3Index
Trend YoY growth is +3.2%, accelerating by 5 bps/year over the last 25Y. Latest: +3.3%, 13 bps above trend, a 0.07σ deviation. The latest YoY reading is boosted by 76 bps due to an easy comparison base from Mar '25. At current levels, YoY would fall to +2.8% by May '26 as comparisons tighten.
Level
YoY %
y = 1.9% + 5 bps/yr · t
Deviation from trend