Under what circumstance can a nation’s welfare improve by imposing an import tariff?

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When the nation is relatively small compared to othersIf the tariff leads to a significant improvement in the country's terms of tradeWhen the tariff benefits the welfare of its trade partnersIf the government collects more tax revenue as a result of the tariff

Explanation

A country can experience an increase in welfare from an import tariff if the tariff sufficiently improves its terms of trade. This means the country gains more favorable prices on its imports relative to its exports. Being a small country usually limits this effect, and benefits to trading partners or increased government revenue do not necessarily translate into improved national welfare.