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Treasury Ladder Break-Even Age Calculator

The Treasury Ladder Break-Even Age Calculator estimates the age at which cumulative after-tax Treasury interest reaches a target earnings amount. The target is explicit, so “break-even” can represent the amount you personally want the ladder’s net interest to recover rather than assuming one universal definition.

The model uses a constant average Treasury yield and applies a federal marginal tax rate to interest. It does not apply state or local income tax to Treasury interest, consistent with current U.S. tax treatment. The result is most useful as a payback-style planning measure, not as a forecast of bond prices or total investment return.

Inputs

years
USD
%
%
USD
Result
—
Estimated break-even age
Years to target—
After-tax annual interest—
Target amount—

1. Enter your current age
This sets the starting point for the age-based result.

2. Enter Treasury principal
Use the amount expected to remain invested in the ladder.

3. Add average yield and federal rate
The calculator converts the gross Treasury yield to a simplified after-tax annual interest rate.

4. Set your break-even target
Enter the cumulative after-tax interest amount you want the ladder to generate.

5. Review age and timing
The result adds the estimated years needed to your current age.

Annual after-tax interest = Principal × y × (1 − f)
Years to target = Target / Annual after-tax interest
Break-even age = Current age + Years to target

The model treats principal, yield, and federal rate as constant and assumes interest is taken as income rather than compounded. State and local income taxes are not applied to Treasury interest.

What the result means

The result is the estimated age when cumulative modeled after-tax interest equals the target amount you entered.

This payback-style measure is not an investment recommendation and does not capture changing yields, inflation, price changes, or reinvestment.

Given: Age 55, $250,000 Treasury ladder, 4.30% yield, 24% federal rate, and a $100,000 interest target.

Calculation: Annual after-tax interest = $250,000 × 4.30% × 76% = $8,170. Years to target = $100,000 / $8,170 ≈ 12.24 years. Break-even age = 55 + 12.24 ≈ 67.24.

Result: Estimated break-even age: about 67.2.

Interpretation: If the assumptions stay constant and interest is withdrawn rather than compounded, the target is reached a little over 12 years from now.

What exactly is breaking even here?

The calculator defines break-even as cumulative after-tax interest reaching the target amount you enter. It is not the same as recovering a trading loss or matching another investment.

Why is Treasury interest not reduced by state tax?

Marketable Treasury interest is exempt from state and local income taxes under current U.S. rules, although federal income tax generally applies.

Does reinvesting interest change the answer?

Yes. Reinvestment can shorten the time to a target because future interest may be earned on a larger balance. This calculator intentionally uses a non-compounding income model.

What if yields fall after I build the ladder?

The estimate will be too optimistic if the ladder’s average yield ultimately falls below the input. You can rerun the calculator with a lower yield for a stress case.

Can the break-even age exceed normal planning horizons?

Yes. A large target relative to principal and after-tax yield can produce a long payback period, which is useful information when comparing strategies.