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Investment
Rebalancing bands trigger action only when drift exceeds a threshold — more efficient than calendar rebalancing.
By FreeCalculators Editorial · Published 2026-09-01 · Updated 2026-09-04 · 4 min read · 967 words
A rebalancing band is a tolerance around each target weight that must be breached before you trade. With 5-percentage-point bands, a 60% equity target is left alone anywhere between 55% and 65% and rebalanced only outside that range. The design intent is to trade on meaningful drift rather than on the calendar, which cuts the number of taxable events sharply while keeping risk inside a stated range.
An absolute band is expressed in percentage points of the whole portfolio: plus or minus 5 points around a 60% target. A relative band is expressed as a share of the sleeve own weight: plus or minus 25% of a 60% target gives a range of 45% to 75%.
The distinction matters most for small sleeves. A 5-point absolute band around a 5% REIT sleeve means the sleeve can double before it trips, since 5 points of drift is 100% of its weight. A 25% relative band trips at 6.25%, which is what you actually intended.
| Sleeve target | 5-point absolute band | 25% relative band | Which is sensible |
|---|---|---|---|
| 60% US equity | 55% to 65% | 45% to 75% | Absolute — relative is far too loose |
| 30% bonds | 25% to 35% | 22.5% to 37.5% | Either works |
| 20% international | 15% to 25% | 15% to 25% | Identical at this weight |
| 10% small-cap value | 5% to 15% | 7.5% to 12.5% | Relative — absolute allows a doubling |
| 5% REITs | 0% to 10% | 3.75% to 6.25% | Relative — absolute is meaningless here |
| 2% satellite position | Never trips | 1.5% to 2.5% | Relative only |
The saving is in trade count. Quarterly calendar rebalancing places trades four times a year whether or not the portfolio has moved, and in a taxable account each of those sales realizes a gain. A 5-point band on a two-sleeve portfolio typically trips somewhere between zero and twice a year.
Ten years of quarterly rebalancing versus 5-point bands (2026)
Portfolio = $500,000 taxable, 70/30 target Assumed realized gain per rebalance = $9,000 Combined tax rate on long-term gains = 20% Quarterly calendar Rebalance events = 4 x 10 = 40 Events with a taxable sale (assume 60%) = 24 Tax paid = 24 x $9,000 x 20% = $43,200 5-point bands Rebalance events over 10 years = about 7 Events with a taxable sale = 7 Tax paid = 7 x $9,000 x 20% = $12,600 Difference over 10 years = about $30,600 Risk control is comparable; the tax bill is not.
The gain-per-rebalance figure is an assumption used to make the comparison visible, and your own number depends on how appreciated your lots are. The structural point holds regardless: fewer trigger events means fewer realized gains, and the IRS taxes realized gains in the year they occur rather than when you eventually sell.
Checking quarterly and trading rarely is the combination that makes bands work. Checking annually means a band can trip in February and go uncorrected until December, which defeats the purpose of having a threshold at all.
Test candidate band widths against your own sleeve sizes in the portfolio rebalancing strategy tool, and check how volatile the sleeves are first with the portfolio volatility calculator. A band narrower than the sleeve normal quarterly movement will trip constantly.
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This guide was written and reviewed by FreeCalculators Editorial, drawing on published formulas, official government sources, and real calculator outputs from our 4 calculators in this category. Every claim is sourced; every formula is auditable. Read our review policy.