Contribution limits are among the most important and most misunderstood features of American campaign finance. They determine how much money any person or committee may give directly to a candidate, a party, or another committee, and they shape the entire structure of how campaigns are funded. This guide explains where these limits come from, how they work, what they apply to, and just as importantly, what they do not apply to. The aim is a clear, nonpartisan understanding of the rules that govern direct giving in federal elections.
The rationale for contribution limits was settled by the Supreme Court in its 1976 decision in Buckley v. Valeo. The Court held that the government has a legitimate interest in preventing corruption and the appearance of corruption, and that placing limits on direct contributions to candidates serves that interest. The concern is straightforward: a very large gift given directly to a candidate could create a sense of obligation, or at least the public perception of one. Limits are meant to reduce that risk while still allowing citizens to support the candidates they favor.
At the same time, the Buckley Court drew a sharp distinction that continues to define the field. While contributions to candidates may be limited, independent spending generally may not, because money spent independently of a campaign was judged to pose less danger of a corrupt exchange. This distinction explains why the limits described below apply to direct contributions but not to many other forms of political spending.
The most familiar limit governs how much an individual may give directly to a candidate's campaign. This limit applies separately to each election, meaning a primary and a general election are treated as two distinct elections, so a donor may give the maximum amount for the primary and again for the general. The limit is not fixed permanently. Under changes made by the Bipartisan Campaign Reform Act of 2002, the individual contribution limit is adjusted for inflation every two years, so it rises gradually over time. In recent cycles it has stood at a few thousand dollars per election; for example, it was set at three thousand three hundred dollars per election for the 2023 to 2024 cycle and continues to be indexed upward in subsequent cycles. Because the figure changes, the reliable way to think about it is as a periodically adjusted cap rather than a single permanent number.
Individuals may also contribute to political action committees and to party committees, each subject to its own limit. An individual's contribution to a traditional political action committee is capped at a fixed annual amount, long set at five thousand dollars per year, a figure that is not indexed for inflation. Contributions to the national committees of a political party are subject to a separate, higher limit that is adjusted for inflation. Contributions to state and local party committees have their own caps as well. These layered limits reflect the principle that money given to intermediaries, which then support candidates, is also regulated, though at different levels depending on the type of recipient.
Political action committees are not only recipients of contributions; they also make them, and their giving is limited too. A political action committee that qualifies as a multicandidate committee, generally one that has received contributions from a sufficient number of donors and has supported multiple candidates, may contribute up to five thousand dollars to a candidate per election. This is the figure most often cited when describing PAC contributions. Multicandidate committees may also give to party committees and to other PACs within applicable limits. These caps are what distinguish traditional PACs from the independent-expenditure-only committees known as Super PACs, which face no such limits because they do not contribute directly to candidates.
For many years, federal law also imposed an aggregate limit, a ceiling on the total amount any single individual could contribute to all federal candidates and committees combined during an election cycle. This was separate from the per-candidate limits. In 2014, however, the Supreme Court in McCutcheon v. Federal Election Commission struck down the aggregate limit, holding that it did not serve the anti-corruption interest closely enough to justify restricting how many different candidates and committees a donor could support. Importantly, the decision did not eliminate the limits on giving to any single candidate; a donor still cannot exceed the per-candidate cap. What changed is that a donor may now give the maximum to as many different candidates and committees as they wish.
Understanding contribution limits requires understanding their boundaries. Several significant categories of political spending are not subject to these caps. Independent expenditures, money spent to support or oppose a candidate without coordinating with that candidate, are not limited, a direct consequence of the Buckley framework and later decisions. Super PACs may raise and spend unlimited amounts precisely because they make only independent expenditures. Candidates spending their own money on their own campaigns are also not limited, since the Buckley Court struck down restrictions on a candidate's personal spending as a form of protected expression. These exceptions explain why the total money involved in a competitive race can far exceed what the contribution limits alone might suggest.
Beyond the dollar limits, federal law also bars certain sources from contributing at all. Corporations and labor unions may not contribute their treasury funds directly to candidates, a prohibition rooted in the Tillman Act of 1907 and the Taft Hartley Act of 1947, though they may operate political action committees funded by voluntary individual contributions. Foreign nationals are prohibited from contributing in connection with any United States election. Federal government contractors face their own restrictions. The law also forbids making a contribution in the name of another person, a practice known as a straw donor scheme, which is treated as a serious violation because it conceals the true source of the money and undermines the disclosure system.
Because several of the limits are adjusted for inflation on a two-year cycle, the specific dollar figures evolve from one election to the next. This indexing, introduced by the 2002 reforms, was designed to keep the limits from eroding in real terms as prices rise. For anyone tracking campaign finance, this means the maximum contribution figures are best understood as a moving target, updated each cycle by the Federal Election Commission, rather than as permanent constants.
Contribution limits leave a clear imprint on the figures you see in any campaign finance report. Because no individual may exceed the per-candidate cap, a campaign that has raised a large sum from individuals has necessarily attracted many separate donors, not a few enormous gifts. The mix between individual and PAC money, the presence of candidate self-funding, and the scale of independent spending around a race all reflect the rules described here. Knowing the limits allows a reader to interpret a filing accurately: to recognize what a fundraising total implies about a candidate's base of support, and to understand why the money flowing through independent channels operates under entirely different rules.
See it in the data: Compare each candidate's individual, PAC, and self-funded money in our 2026 Campaign Finance Tracker.