Estimate the age at which a bond ladder's annual after-tax income advantage over a benchmark fixed-income option recovers an upfront switching or setup cost. This gives the unusual 'break-even age' label a concrete decision framework: the ladder must earn more after tax than the benchmark, and that annual advantage accumulates until it covers the entered cost. The calculator is useful when evaluating a ladder transition, advisory fee, or transaction expense. It does not compare bond prices, duration risk, defaults, liquidity, or future yield changes.
1. Enter your current age
This converts break-even years into an age.
2. Enter the investment amount
Use the principal being compared in both strategies.
3. Enter ladder and benchmark yields
Use comparable annual yield assumptions.
4. Apply an effective tax rate
The same entered rate is applied to both interest streams in this simplified model.
5. Enter the switching cost
The result shows how long the ladder's after-tax income advantage takes to recover it.
The formula requires the ladder's after-tax income to exceed the benchmark's. If the annual advantage is zero or negative, the calculator reports no break-even.
The same tax rate is applied to both yields. If the securities have different federal or state tax treatment, use after-tax-equivalent yields or a more detailed comparison.
The result is the age at which cumulative modeled after-tax income advantage equals the one-time switching cost.
It is not a recommendation to hold a ladder until that age; price risk, reinvestment risk, credit quality, and liquidity still matter.
Given
Calculation
Annual after-tax advantage = $250,000 × (0.048 − 0.040) × 0.76 = $1,520. Break-even years = $1,200 ÷ $1,520 = 0.79 year.
Result
Break-even age ≈ 55.8.
Under these inputs, less than one year of the modeled income advantage recovers the entered switching cost.
The calculator defines break-even as cost recovery versus a benchmark. Adding the recovery period to current age produces the break-even age.
The annual advantage becomes zero or negative, so the calculator reports no break-even under the entered assumptions.
Not necessarily. Federal and state tax treatment can differ by security. For cross-tax-status comparisons, convert each yield to an after-tax basis before using a simplified single-rate model.
It can, if you can estimate it and want it included. The field is a general one-time cost input and can also represent fees or advisory costs.
No. Break-even here measures only an income-and-cost comparison. Credit risk, duration, liquidity, call features, and reinvestment risk are separate issues.