Public saving and its share of GDP as government purchases change, with revenue and transfers fixed.
Change in purchases
Public saving
Share of GDP
−400
−200
−1.0%
−200
−400
−2.0%
none
−600
−3.0%
◀ yours
+200
−800
−4.0%
+400
−1,000
−5.0%
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What it calculates: Public saving (Sg), Budget position, Balance as a share of GDP, Net taxes (T).
Updated 22 September 2026 · Transparent assumptions
Taxes of 4,500 less transfers of 1,500 and purchases of 3,600 leave public saving of −600
Public saving is the government’s budget balance seen as saving: revenue it keeps after paying for everything it buys and every transfer it makes. With net taxes T (tax revenue minus transfers) it is simply Sg = T − G. In the worked economy ($ billions), net taxes are 4,500 − 1,500 = 3,000 and public saving is 3,000 − 3,600 = −600 — a deficit of 3% of GDP.
Sg = (taxes − transfers) − G
A negative figure means the government is dissaving: it borrows 600 in the period, drawing on private or foreign saving to do it.
Worked example
T = 4,500 − 1,500 = 3,000
Sg = 3,000 − 3,600
Sg = −600
(a deficit of 3.0% of GDP)
The federal government dissaved $1.77 trillion in fiscal 2025, about 5.8% of GDP
The US federal deficit was $1,775 billion in fiscal year 2025 (October 2024 to September 2025) and $1,815 billion the year before, according to the Office of Management and Budget. Measured against average GDP over the fiscal year that is about 5.8% — large public dissaving at a time of low unemployment, when deficits usually shrink.
State and local governments are counted separately and usually run close to balance, so the federal figure dominates US public saving.
Transfers are not in GDP, but they still reduce public saving
Government purchases (G) are goods and services the government buys — salaries, equipment, construction — and they count in GDP. Transfers such as pensions and unemployment benefits buy nothing, so they are left out of GDP, but they are money leaving the government all the same, and public saving subtracts them through net taxes.
Interest on the public debt is treated the same way: a transfer from taxpayers to bondholders. As debt and interest rates rise, interest takes a larger share of revenue before any purchase is made.
A deficit competes with private investment for the same pool of saving
Public saving is part of national saving, so a larger deficit leaves less saving to fund private investment. In the loanable-funds model the extra government borrowing raises the real interest rate, and some private investment that would have happened is crowded out. In an open economy foreign saving can fill part of the gap, which shows up as a larger trade deficit.
How much crowding out happens depends on the state of the economy. With idle resources and low interest rates it can be small; near full employment it can be close to complete.
Recessions widen deficits without any change in policy
Tax revenue falls and benefit payments rise automatically when output falls — the automatic stabilizers — so public saving turns more negative in a recession even if no law changes. Economists therefore split the balance into a cyclical part, which disappears as the economy recovers, and a structural part, which would remain at full employment.
A deficit of 3% of GDP in a deep recession and the same deficit at full employment tell very different stories about fiscal policy. This calculator measures the total; judging it needs the business cycle alongside.
Spending on roads and schools counts against public saving here, though it builds assets
In the simple identity every government purchase reduces public saving, including investment in roads, bridges and equipment that will serve for decades. National accounts separate government consumption from government investment, and some economists argue a budget should borrow only for the second — the “golden rule” once used in UK fiscal policy.
The calculator follows the textbook identity. If you want public saving net of public investment, enter only current purchases as G and count the investment on the investment side of the national saving identity.
Frequently Asked Questions
What is public saving?
Public saving is the government’s budget balance: tax revenue minus transfers minus government purchases, Sg = T − G. It is positive for a surplus and negative for a deficit.
Is public saving the same as the budget deficit?
It is the same quantity with the opposite sign: a deficit of 600 is public saving of −600. National-accounts and official budget figures can differ slightly in timing and treatment of investment.
Why do transfers reduce public saving if they are not in GDP?
Transfers are money the government pays out without buying anything. They are excluded from GDP but they still leave the budget, so public saving subtracts them.
How does public saving affect interest rates?
Lower public saving means more government borrowing from the pool of saving, which in the loanable-funds model raises the real interest rate and crowds out some private investment.
Sources & References
Figures on this page are checked against primary, authoritative sources. Links open in a new tab.
Results are estimates for planning and analysis based on the figures you enter. They are not accounting, tax, or financial advice — verify with your own records and a qualified professional before making decisions.