How Much Should You Raise Bond Allocation When Rates Fall?
Bond prices and market interest rates work like a seesaw: they move in opposite directions. When rates fall, bonds already issued at higher coupons become more valuable, pushing their prices up. That's why once a central bank starts cutting rates, many investors raise their bond allocation to capture both price appreciation and coupon income. Still, the right weight depends on more than the rate outlook alone; your own risk tolerance matters just as much.
This calculator starts with a base bond weight for your investor type, then adds an allocation bump based on your expected rate cut to arrive at a recommended weight. It also multiplies your bond's duration (rate sensitivity) by the expected cut to give a rough estimate of the price gain. Longer duration means bigger gains for the same rate cut, but also bigger losses if rates rise instead. Treat the result as a general guide for sizing a position, not a recommendation for any specific bond or fund.
If the market has already priced in expected rate cuts, further upside may be limited, so rather than piling into a large position at once based on a forecast, it's often safer to build the position gradually across several points in time while managing duration.
Frequently Asked Questions
Falling rates make existing higher-coupon bonds more attractive, pushing prices up. That's why bond allocation often rises during rate-cut cycles.
A measure (in years) of how sensitive a bond's price is to rate changes. Longer duration means bigger price moves for the same rate cut.
No. It's a general reference based on your type and outlook. Adjust for your full portfolio and goals.
※ Estimated gains and recommended weights are based on simple assumptions and are for reference only.