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Midterm elections are three weeks away, and the market is watching. Over $276 million in political donations from one CEO alone. Control of Congress on the line. And your 401(k) caught in the middle.
Before you touch your portfolio, look at what actually happened in the last seven midterm cycles. We pulled the real closing data — no cherry-picking. The pattern is remarkably consistent, and it has direct implications for what you do (and don’t do) before year-end.
Pattern 1: October of Midterm Years Is Stocks’ Best Month
Since 1950, the S&P 500 has averaged +3.0% in October of midterm years, finishing positive 73.7% of the time (Carson Group). From October 1 to Election Day across the last seven midterms, the average gain was +4.3% — positive in 6 of 7 cycles. The lone loser: 2018 (-5.8%, trade war + QT).
The October lows, in every cycle except 2018, landed in the first half of the month — then markets rallied into month-end. Early-October chop has historically been the entry, not the exit.
Pattern 2: Election Day Brings Relief
The S&P 500 rose the day after the midterm vote in 6 of 7 cycles. Markets hate uncertainty more than they hate either party’s victory — once the outcome is known, the relief rally is the norm. 2018’s +2.12% post-election bounce is the textbook case.
Pattern 3: The Year After Is the Real Prize
Here’s the number that matters most for retirement savers: the 12 months following a midterm election have averaged roughly +15% across 20 cycles since 1946 — and have never been negative (Carson Group, BofA). UBS notes ~6% average gains from September into year-end in midterm years, extending to ~14% through the following March.
Why? Gridlock. Markets historically reward divided government — no sweeping legislation means no sweeping surprises for corporate earnings.
Pattern 4: Bitcoin Marches to Its Own Drum
Bitcoin fell in all three midterm Octobers on record (-4.0%, -2.0%, -13.9%). Crypto-specific shocks — FTX’s collapse on Election Day 2022, the Mt. Gox aftermath in 2014 — overrode any election seasonality. Don’t assume your crypto follows your stocks into November.
What To Actually Do Before Year-End
- Don’t trade the election. With 6-of-7 relief rallies and a never-negative year-after record, selling into midterm fear has been the losing trade.
- Rebalance on schedule. If tech’s run has left your 401(k) overweight equities, trim back to target — that’s discipline, not prediction.
- Tax-loss harvest. You have until December 31. Bank any losses in taxable accounts to offset gains; the wash-sale rule means waiting 30 days to repurchase.
- Max the accounts. 401(k) elective deferral limit for 2026: check your plan — if you haven’t hit it, November and December paychecks are your last chance.
- Review beneficiaries. Elections change tax law; outdated beneficiary forms cause more retirement-plan damage than any midterm.
The Bottom Line
Seven midterms of data say the same thing: October chop resolves higher, Election Day brings relief, and the year after has never lost money. The investors who got hurt weren’t the ones who stayed invested through the noise — they were the ones who traded it.
Related reading: Midterm October Market History: Stocks & Bitcoin — full data tables
Are you making any portfolio moves before the midterms, or sitting tight? Tell us your plan below.
Sources & Methodology
- Bull Lounge — Midterm October Market History (S&P 500 and BTC daily closes verified via StatMuse/Yahoo Finance, Oct 2026): bullounge.com
- Seasonality statistics: Ryan Detrick / Carson Group, UBS, JPMorgan Asset Management, Bank of America
Not financial advice. Past performance does not predict future results. Do your own research.
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