Opposition research on FEC filings starts at the FEC's Campaign Finance Disclosure Portal (fec.gov), where every federal candidate committee posts Form 3 or 3X reports, itemized contributions on Schedule A, and disbursements on Schedule B. Pull the summary page first for total raised, total spent, and cash on hand, then drill into the schedules for donor names, employers, vendor payments, and burn rate. The portal only covers federal candidates — state legislative, county, and municipal races aren't required to file with the FEC, so you'll need the relevant state disclosure database for anything below Congress.
- Research an opponent’s FEC filings on fec.gov by pulling Form 3/3X summaries, then Schedule A donors and Schedule B vendors.
- The $200 itemization threshold hides small-dollar donors from public view — only contributions above that show a name.
- Senate candidates still file paper reports with the Secretary of the Senate, which can lag FEC.gov by weeks.
- 48-hour notices reveal late-race contributions over $1,000 during the pre-election window.
- Campaign Deputy’s compliance reporting tools keep your own filings clean while you study the other side’s.
Why this matters
An opponent's FEC filings tell you who's funding them, how fast they're spending, and whether their compliance is sloppy enough to become a story. Democrats, non-partisan campaigns, and independents running against a poorly-organized opponent can use late filings, amended reports, or vendor patterns as real signals — not just gossip. In 2026, with filing deadlines unchanged from prior cycles, a campaign that misses a quarterly deadline or files three amendments in one cycle is telling you something about their internal operation before you ever knock a door.
How to research an opponent's FEC filings
Work through these steps in order — each one builds on the last.
- Search fec.gov by candidate or committee name. Every registered federal candidate has a committee ID; use it to pull every report filed since the committee registered.
- Read the Form 3 or 3X summary first. This gives total receipts, total disbursements, and cash on hand as of the reporting period's end date — your baseline for comparison.
- Open Schedule A for itemized contributions. Only contributions over $200 from an individual require a name, employer, and occupation. Anything under that threshold appears as an unitemized lump sum, so the donor list you see is partial by design.
- Open Schedule B for disbursements. This shows who's getting paid — consultants, ad buyers, printers, list vendors — and how much of the budget is going to overhead versus direct voter or donor contact.
- Check 48-hour notices during the pre-election period. Contributions of $1,000 or more received in the days before an election trigger a separate, faster disclosure than the standard quarterly report.
- Compare filing dates to deadlines. Standard quarterly deadlines fall on April 15 (Q1), July 15 (Q2), October 15 (Q3), and January 31 (Year-End). A report filed late or amended repeatedly is a compliance red flag worth noting.
- Cross-reference the donor list against your own targets. Overlap between your opponent's itemized donors and your prospect list tells you where fundraising competition is tightest.
For your own side of the ledger, FEC compliance reporting software built for candidates removes the guesswork on which numbers roll into which schedule — useful once you start comparing your own totals against what you're reading in an opponent's filings.
House and presidential candidates: filings live directly on FEC.gov
House and presidential campaign committees file electronically with the FEC, and those reports post to fec.gov typically within a day or two of the filing deadline. This is the cleanest data set to work with — searchable, downloadable, and current. If you're studying a House race, the summary, Schedule A, and Schedule B for that committee will all be current as of the last quarterly or monthly filing, whichever schedule the committee has chosen.
Senate candidates: filings route through the Secretary of the Senate first
Senate campaign committees have historically filed paper reports with the Secretary of the Senate rather than electronically with the FEC. Those paper filings get imaged and forwarded to the FEC, which then re-enters the data onto fec.gov — a process that can add real lag between when a Senate candidate files and when the numbers show up searchable online. If a Senate opponent's report seems to be missing in the days right after a deadline, check whether it's sitting at the Secretary of the Senate stage before assuming it's late.
“If a Senate filing looks late three weeks after the deadline, it’s probably sitting at the Secretary of the Senate, not missing.”
Why FEC filing data varies from committee to committee
- Committee type — a candidate committee, joint fundraising committee, and leadership PAC all file separately, and money can move between them.
- Filing frequency — some committees choose monthly filing during an election year instead of quarterly, which changes how current the public data looks.
- Reporting period — off-year filings cover longer stretches with less activity; election-year filings are denser and more frequent.
- Amendments — a committee can amend a prior report, which restates numbers you may have already logged.
- In-kind versus cash contributions — in-kind donations (donated services, goods) show up differently than cash and can inflate or deflate the headline total depending on how you're reading it.
- State versus federal jurisdiction — a state legislative or city council opponent won't appear on fec.gov at all; you need the relevant state's disclosure system instead, and Campaign Deputy's guides on how to run for state representative and comparable races point to where those filings live.
Track your own fundraising while you research theirs
Compare your totals against an opponent’s filings in real time.
Related questions
What's the difference between Schedule A and Schedule B on FEC filings?
Schedule A lists itemized contributions received — donor name, employer, occupation, and amount for anyone giving over $200. Schedule B lists disbursements — every vendor payment, consulting fee, and ad buy a committee made during the reporting period. Reading both together shows you the full money-in, money-out picture for a campaign.
How often do candidates have to file FEC reports?
Most federal candidate committees file quarterly, with deadlines on April 15, July 15, October 15, and January 31, though some choose monthly filing in an election year. Committees also file 48-hour notices for large contributions received right before an election, on top of the regular quarterly schedule.
Can I see an opponent's donor list for free?
Yes — itemized contributions over $200 are public and searchable for free on fec.gov, no account or paywall required. Contributions under $200 aren't itemized by name, so the full donor list is never fully visible for any committee.
Do state legislative candidates show up on FEC.gov?
No, FEC.gov only covers federal candidates running for the House, Senate, or presidency. State legislative, county, and municipal candidates file with their state's own disclosure system, which varies by state in format and update frequency.
How do I compare fundraising totals against an opponent fairly?
Compare total receipts and cash on hand as of the same reporting period end date, since a mid-cycle comparison of mismatched periods will distort the picture. Tools like Campaign Deputy's fundraising goal tracker help keep your own numbers aligned to the same reporting windows you're pulling for an opponent.
How do I research an opponent’s FEC filings in 2026?
Search fec.gov by the candidate or committee name, pull the Form 3 or 3X summary for totals, then check Schedule A for itemized donors and Schedule B for vendor payments. Filing deadlines in 2026 follow the standard quarterly schedule unless a committee has opted into monthly filing.
What does the $200 itemization threshold mean for opposition research?
Any individual contribution of $200 or less does not require the donor’s name to be disclosed on Schedule A. This means the public donor list you’re reading is only a partial picture of who’s actually funding a campaign.
Why does a Senate candidate’s FEC filing show up later than a House candidate’s?
Senate campaign committees have historically filed paper reports with the Secretary of the Senate, which then get imaged and forwarded to the FEC for entry onto fec.gov. That extra step adds lag compared to House and presidential committees, which file electronically direct to the FEC.
Is an opponent’s cash-on-hand number more useful than total raised?
Cash on hand tells you what a campaign can spend right now, while total raised only tells you cumulative fundraising history. For late-race strategy in 2026, cash on hand is usually the more actionable number to track.
Can amended FEC reports change what I already logged about an opponent?
Yes, a committee can file an amendment that restates a prior report’s totals, sometimes months after the original filing. Check the filing date and version number on fec.gov before treating any single report as final.
What’s the best way to track an opponent’s vendor spending?
Schedule B disbursements list every vendor payment by name, amount, and purpose code, so sorting that schedule by amount surfaces the biggest spends fast. Repeated payments to the same consulting firm or list vendor usually signal a campaign’s core strategy.
Do 48-hour notices matter if I’m not close to election day?
48-hour notices only apply to contributions of $1,000 or more received during the pre-election period, so they’re not relevant outside that window. Outside the 48-hour window, the same contribution would just appear on the next quarterly Schedule A.
One last thing
The most overlooked signal in FEC research isn't the total raised — it's the ratio of itemized to unitemized contributions on Schedule A. A campaign with a high share of contributions under $200 is running on grassroots small-dollar donors; a campaign with mostly large itemized gifts is leaning on a short list of major donors and bundlers, which is a more fragile fundraising base to attack or defend against depending on which side you're on in 2026.
Related guides
