---
title: "Cash-neutral vs duration-neutral rebalancing: pick a side"
description: Cash-neutral and duration-neutral rebalancing produce different trades, different risk profiles, and different compliance outcomes. Know which fixed income rebalancing strategy fits your mandate.
---

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# [Cash-neutral vs duration-neutral rebalancing: pick a side](https://www.thinkfolio.com/blog-and-guides/cash-neutral-vs-duration-neutral-rebalancing-pick-a-side)

 Written by [Thinkfolio](https://www.thinkfolio.com/blog-and-guides/author/thinkfolio) | Feb 16, 2026 5:30:00 PM

## Let's do a thought experiment: Two PMs sit next to each other. Both run IG GBP credit against the same benchmark. Both want to rotate from financials into utilities. One builds the trade list cash-neutral, the other duration-neutral. They end up with different trades, different risk profiles, different compliance outcomes. Same idea. Different implementation. Nobody discussed which method to use because of their platform defaults.

Cash-neutral is simple rebalancing: Sell proceeds fund the buys. Market value stays flat. The problem is that the bonds being sold and bought almost never have the same duration. A cash-neutral switch from a 3-year bank bond into a 10-year utility increases duration as a side effect. The PM wanted a sector rotation. They got a sector rotation and a long duration bet.

Duration-neutral is cleaner from a risk perspective. The trade list is sized so the portfolio's overall duration doesn't move. But the cash amounts on each leg rarely match. There's a residual that needs to go somewhere. Money market instrument, futures overlay, or just accepting the cash drag. In a mandate with tight liquidity constraints this becomes its own operational problem.

A few consecutive cash-neutral switches can drift duration by 0.3 years or more. If the mandate has a ±0.5 year band around the benchmark, that drift pushes the portfolio toward the edge without anyone intending it. The duration creep is a by-product of individually reasonable sector calls.

There is a third way of doing it: factor-neutral rebalancing. Hold duration constant, but also spread duration, convexity, or a set of factor exposures. Analytically this is more ambitious. Practically harder, because the rebalancing engine has to solve a multi-constraint optimisation. Most platforms support cash-neutral and duration-neutral. Fewer systems support arbitrary factor constraints, and the computation time on those can be lengthy.

Short-duration credit with a tight band should rebalance duration-neutral. Total return with wide limits might prefer cash-neutral for speed. Liability-matching portfolios should arguably be liability-neutral, which is a different constraint that most rebalancing tools do not support natively.

[View full post](https://www.thinkfolio.com/blog-and-guides/cash-neutral-vs-duration-neutral-rebalancing-pick-a-side)

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