6. Build the bond plan before the rate forecast

Liquidity moving through layers of capital spending and branching into several market paths — Image generated with OpenAI from the article topic

Official sources checked September 6, 2026. Unless stated otherwise, numbers and scenarios are hypothetical, not current rates or product returns.

After learning about bonds, the next question is usually how much to buy now. A plan built around one rate forecast becomes unstable whenever that forecast changes. Begin with the dates money must leave the account.

The purpose changes the investment

Won needed for a home purchase next year and dollars needed for tuition in three years are different liabilities. Buying the same long dollar bond for both can mismatch currency and timing.

Purpose	First constraint	Remaining question
Near-term won expense	Won availability and withdrawal date	Can price or currency fluctuations be tolerated?
Scheduled dollar expense	Dollar payments and redemption timing	Will proceeds arrive before spending?
Long-term income	Payment schedule and reinvestment	Can the budget handle lower future income?
A view that long yields will fall	Sensitivity and position size	What if yields rise instead?

This is a sequence of questions, not an allocation recommendation. Replace “bonds are safe” with a description of the risk you intend to reduce.

Stagger maturities with a ladder

A bond ladder spreads principal repayments across maturities. Proceeds can fund expenses or be reinvested further out. Fidelity’s explanation connects staggered maturities with those reinvestment decisions.¹

Suppose $10,000 is needed in each of the next three years. You could examine bonds returning $10,000 face value in each year. This does not imply a purchase cost of exactly $30,000: prices, accrued interest, and fees determine the cash needed.

Redemption	Hypothetical face value	Intended action
In one year	$10,000	Pay the first expense
In two years	$10,000	Pay the second expense
In three years	$10,000	Pay the third expense

Here, principal is spent rather than reinvested. Without those expenses, maturing proceeds could instead purchase a new three-year security to continue the ladder. Record coupons separately and allow time for proceeds to become available before spending.

A ladder does not eliminate loss. Early sales depend on market prices; reinvestment may occur at lower yields. Credit and transaction costs still matter.²

Translate sensitivity into money

Equal investments with modified durations of 2 and 15 have very different approximate responses to a one-percentage-point yield change.³

Assumed modified duration	Yield rises 1 percentage point	Yield falls 1 percentage point
2	Price about −2%	Price about +2%
7	Price about −7%	Price about +7%
15	Price about −15%	Price about +15%

These are first-order, all-else-equal approximations. Convexity, elapsed time, income, and costs affect actual outcomes. Errors can be material for large moves and long durations. This is not a forecast-return table.

A 15% price decline on KRW 10 million represents KRW 1.5 million before other effects. If that would delay a home payment or debt repayment, the position conflicts with the purpose of the money. Consider adverse outcomes before the attractive upside scenario.

A slowdown does not lift every bond

When corporate credit deteriorates, the spread over comparable Treasuries can widen.⁴ Suppose Treasury yields fall 0.5 percentage points while a corporate spread widens 1 percentage point. A simplified combined corporate yield rises 0.5 percentage points, putting downward pressure on price.

Treasuries held for a slowdown and high-yield corporate debt held for income are therefore different exposures. Property debt or REIT holdings can add refinancing and rental-income vulnerabilities.

Apply three scenarios to the cash-flow plan. The purpose is to find weaknesses, not assign precise probabilities:

Inflation persists. Long yields rise, long-bond prices fall, and property refinancing stays expensive.
Activity contracts sharply. Treasury yields may fall while credit spreads and vacancy risks increase.
The dollar weakens. A dollar bond earns income but loses value in won. The consequence differs depending on whether the planned expense is in dollars or won.⁵

Leave a plan that survives a headline

Record the purchase reason, intended horizon, spending currency, tolerable price movement, and review trigger. “Revisit the maturity if the three-year dollar expense changes” is a different rule from trading after every policy announcement.

Review the redemption calendar against spending plans periodically, and check automatic reinvestment settings before money is needed. Add quotes, maturity dates, and pretax cash flows to the earlier investment-data verification note.

Buying the bond happens once. Deciding what to do when the money returns remains part of the job. That plan makes the next action explainable even when rates move differently from your forecast.