While credible sources confirm that tariffs could reduce the U.S. Deficit by up to $4 trillion over the next decade according to CBO estimates, there is no direct evidence that Karoline Leavitt specifically made this claim; moreover, the broader context shows that tariffs have complex economic impacts and other statements by Leavitt on related fiscal issues have been contradicted by independent analyses.
Karoline Leavitt says Tariffs will reduce deficit by $4 Trillion

ICYMI: Tariffs Will Reduce Deficit by $4 Trillion – The White House
Source: whitehouse.gov
Key Evidence
The CBO estimates reported by Reuters and The White House show tariffs could reduce deficits by roughly $4 trillion over a decade.
whitehouse.govwhitehouse.govICYMI: Tariffs Will Reduce Deficit by $4 Trillion
investing.cominvesting.comTrump’s tariffs could reduce US deficit by $4 trillion, CBO estimates By Reuters+1 more
PolitiFact found no evidence supporting Leavitt's claim about tariffs reducing deficits but did fact-check her statements on a related tax bill as false.
politifact.compolitifact.comPolitiFact
The Tax Foundation highlights economic costs of tariffs despite potential revenue gains.
taxfoundation.orgtaxfoundation.orgTrump Tariffs: The Economic Impact of the Trump Trade War
What the Evidence Shows
Multiple independent and credible sources, including the Congressional Budget Office (CBO) as reported by Reuters, The White House, and other news outlets, indicate that if the Trump-era tariffs remain in place for the next decade, they could reduce the primary deficit by approximately $3.3 trillion and cut federal interest payments by about $0.7 trillion, totaling around $4 trillion in deficit reduction.whitehouse.govwhitehouse.govICYMI: Tariffs Will Reduce Deficit by $4 Trillion
investing.cominvesting.comTrump’s tariffs could reduce US deficit by $4 trillion, CBO estimates By Reuters+3 more
These estimates are based on increased tariff revenues and their impact on federal finances over a 10-year horizon. However, these projections do not account for broader economic consequences such as increased costs to consumers or potential retaliatory trade measures.
Regarding Karoline Leavitt, the only direct mention in the sources relates to her statement about a tax and spending bill not adding to the deficit, which PolitiFact rated as false based on multiple analyses showing it would add $3 to $4 trillion over 10 years. There is no direct source confirming that Leavitt claimed tariffs would reduce the deficit by $4 trillion.politifact.compolitifact.comPolitiFact
Therefore, attributing this specific tariff-related claim to Karoline Leavitt lacks direct evidence from reliable sources. The claim is misleading because it combines a broadly supported economic projection with an unverified attribution.
Additionally, the economic impact of tariffs is complex and contested; while tariff revenues may reduce deficits on paper, they can also impose costs on households and businesses, which complicates the net economic effect.taxfoundation.orgtaxfoundation.orgTrump Tariffs: The Economic Impact of the Trump Trade War
In summary, while tariffs could reduce deficits by about $4 trillion according to CBO estimates, there is no verified evidence that Karoline Leavitt made this claim, and her related fiscal statements have been fact-checked as inaccurate.