Estimate the value of a bond ladder after taxes on interest and an assumed reinvestment return. The calculator treats the ladder as a principal amount earning a level annual yield, applies an effective tax rate to the interest, and then compounds the resulting balance at a user-selected reinvestment rate. It is useful for comparing taxable and tax-advantaged bond scenarios or stress-testing interest-rate assumptions. Actual bond ladders consist of separate maturities and cash flows, so this page is a simplified portfolio-level estimator rather than a bond-by-bond pricing model.
1. Enter total ladder principal
Use the amount allocated across the bond maturities.
2. Enter an average yield
Use a portfolio-level yield assumption for the ladder.
3. Choose the horizon
Set the number of years you want to model.
4. Enter an effective tax rate
Use zero for interest you reasonably expect to be exempt from the modeled tax.
5. Set a reinvestment return
This approximates growth on retained cash flows after tax.
For transparency, annual interest is calculated from the original principal rather than repricing each bond or changing coupon cash flows as rungs mature.
Federal tax treatment varies by bond type. Interest on many state and local government bonds can be excluded from federal gross income, while taxable bonds generally do not receive that exclusion; state treatment can differ.
The ending value combines the original modeled principal, after-tax interest cash flows, and the chosen reinvestment assumption.
Use bond-specific tax rules and maturity cash flows for a security-level analysis.
Given
Calculation
Gross annual interest = $200,000 × 4.5% = $9,000. After-tax interest = $9,000 × 76% = $6,840. Add that amount each year and compound the running value by 2%.
Result
The modeled ending value is about $320,193. Annual after-tax interest before reinvestment is $6,840.
The estimate helps compare tax and reinvestment assumptions but does not reproduce each bond's exact coupon and maturity schedule.
Use a rate that best approximates the tax applied to the ladder's interest in your scenario. For a simple comparison, a marginal rate may be reasonable, but bond type and jurisdiction matter.
If the interest is exempt from the tax you are modeling, use a 0% rate for that layer. Some municipal interest can have special federal or state treatment, so verify the specific bond.
No. It assumes a hold-and-reinvest style cash-flow model and does not price bond sales.
This keeps the ladder yield assumption separate from the reinvestment assumption. Real ladders may have changing principal and coupon cash flows as maturities roll.
Yes for a rough federal-tax comparison, but Treasury interest and state taxation have specific rules. A dedicated Treasury ladder estimator can use assumptions tailored to that structure.