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Bond Strategies

Laddering Mechanics

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Laddering Mechanics

Successful laddering is less about theory and more about consistent execution: equal allocation per rung, disciplined reinvestment into the long end, and clear documentation to avoid drift.

Key takeaways​

  • Equal dollar allocations across rungs ensure balanced reinvestment timing and consistent yield over time.
  • Reinvestment discipline is critical: always reinvest maturing principal into the longest maturity rung to maintain the ladder's structure.
  • Tracking tools (spreadsheet, broker platform, or portfolio software) are essential to stay organized and avoid missed maturity dates.
  • Rebalancing decisions should be made consciously—document whether you are maintaining equal allocations, overweighting certain maturities, or adjusting for changing goals.
  • Minor deviations (5–10% drift in allocation) are acceptable; beyond that, consider a quarterly or annual rebalance.

Building your ladder from scratch​

To build a ladder, you need three decisions: total capital, maturity range, and rung count.

Example: 150,000 dollar ladder over 10 years with five rungs (2, 4, 6, 8, 10):

MaturityAllocationExample Fund/Bond
2 years30,000IEF (2-year Treasury ETF) or individual 2y Treasury
4 years30,000BND subset (4y corporates) or individual bond
6 years30,000TLT-subset (6y Treasuries) or individual bond
8 years30,000Individual 8y municipal or corporate
10 years30,000VBTLX (10y core bond fund) or individual 10y Treasury

Each rung gets exactly one-fifth of the capital. This symmetry is the ladder's structural foundation.

If you are uncomfortable with exactly equal allocations, keep the allocations within 5% of each other. Avoid weighting one rung at 50% and another at 10%; the imbalance will cause reinvestment clumping.

Calculating target duration per rung​

When using bond funds or ETFs instead of individual bonds, you need to ensure your chosen fund has a duration (interest-rate sensitivity) matching your target maturity rung. The fund's stated duration tells you its average time-to-maturity and interest-rate sensitivity.

For example:

  • IEF (iShares 7-10 Year Treasury ETF) has a duration of around 7 years.
  • BND (Vanguard Total Bond Market ETF) is a 5–6 year blend.
  • VBTLX (Vanguard Total Bond Market Index Admiral) is roughly a 5–6 year fund.

If your 2-year rung uses IEF (which has a 7-year duration), your ladder is no longer a true ladder: you have two long rungs and the 2-year is not actually 2 years.

Better choices for specific rungs:

  • 2-year rung: SHV (short-term Treasury), IEF (7-10 year, mismatched), or individual 2y bonds. Use SHV for true 2-year exposure.
  • 5-year rung: IEF, VBTLX, or individual 5-year bonds.
  • 7-10 year rung: TLT (20+ year Treasuries, overlong), or individual 7-10 year bonds.

The challenge is that ETFs do not have fixed maturities. A more reliable approach for a true ladder is to use individual bonds or laddered bond funds (some mutual fund families offer "laddered" funds with defined maturity dates).

Reinvestment into the long rung​

When principal matures, reinvest at the long end of the ladder to maintain its structure. This is the discipline that makes laddering work.

Scenario: 100,000 dollar 10-year ladder, five rungs (2, 4, 6, 8, 10), 20k per rung.

Year 2 event:

  • The 2-year rung matures and returns 20,000 dollars principal plus accrued interest.
  • Decision: Reinvest the 20,000 dollars principal into a new 10-year bond (not a 2-year).
  • The previous 4-year rung is now effectively a 2-year rung (it has 2 years left).
  • The previous 6-year rung is now a 4-year rung.
  • And so on: the ladder has "rolled down."
  • Your new 10-year bond sits at the long end.

Now your ladder spans 2, 4, 6, 8, and 10 years again.

This rolling structure is what makes a ladder work: you are always collecting maturing principal and always deploying it at the highest yield (the long end).

Handling coupon payments​

Your rungs will pay semi-annual (or annual) coupons. These are interest payments, not principal.

Treatment:

  • You can spend the coupons (good for retirees seeking current income).
  • Or reinvest them into new bonds (adds to your total capital but complicates the ladder's allocation).

If you are holding a ladder for the income, spend the coupons—that is the point. If you are building capital, reinvest the coupons, but do so consciously. Many investors keep coupons in a money-market fund and use them to build a new "secondary" ladder or to fund the next maturity rung when it comes due.

Example: If your 2-year rung pays 1,000 dollars in coupons annually, you can:

  1. Spend it.
  2. Hold it in cash and use it to reinvest part of the principal when the rung matures.
  3. Reinvest it into the longest rung now, increasing that rung beyond 20,000 dollars.

Consistency matters more than perfection here; pick a rule and stick to it.

Using a tracking spreadsheet​

Create a simple table to track your ladder. Update it quarterly or when any maturity event occurs.

Ladder Name: Conservative Core Bond Ladder
Target Total: 100,000
Current Total: 99,850
Target Rung Size: 20,000
Last Updated: 2026-05-01

| Rung | Target Maturity | Ticker/Cusip | Quantity | Current Value | Maturity Date | Notes |
|------|-----------------|---------------|----------|---------------|---------------|-------|
| 1 | 2 years | SHV | 25 shares | 2,512 | 2028-05-15 | Plus 80% of coupons reinvested |
| 2 | 4 years | IEF | 12 shares | 19,870 | 2030-07-10 | Drift 0.65% under target |
| 3 | 6 years | VBTLX | [units] | 20,150 | 2032-03-20 | OK |
| 4 | 8 years | CUSIP:XXXXX | 20 bonds | 20,045 | 2034-01-15 | Corporate, A-rated |
| 5 | 10 years | TLT | 11 shares | 20,245 | 2036-09-30 | Target outward maturity is 10y; actual in TLT is 20y+ |

Include:

  • Current market value and target allocation size.
  • Maturity date (critical: set phone reminders 30 days before maturity).
  • Ticker or CUSIP, quantity, and cost basis (for tax tracking).
  • Notes on coupon reinvestment or allocation decisions.

This spreadsheet is your insurance against forgetting a maturity date or drifting into an unbalanced structure.

Rebalancing: when and how​

Perfect balance is nice but not necessary. A 5% drift is normal and does not hurt. When drift exceeds 10%, consider rebalancing.

Rebalancing methods:

  1. Reinvest maturing principal selectively (easiest): When the 2-year matures, instead of reinvesting the full 20,000 dollars into a 10-year bond, reinvest 15,000 into the 10-year and 5,000 into a shorter rung that has grown too large. This gradually nudges allocations back into balance.

  2. Swap between rungs (more active): Sell from the oversized rung and buy for the undersized rung. This triggers a taxable event if done in a taxable account, so consider doing it in a tax-sheltered account (IRA, RRSP) if possible.

  3. Accept the drift (passive): If the drift is small and your overall ladder still works, leave it alone. Life happens; perfect symmetry is not worth constant fiddling.

For most long-term investors, annual or semi-annual rebalancing (not monthly) is sufficient.

Handling default or credit events​

If you hold individual corporate or municipal bonds, one might default or be downgraded. Your reinvestment plan should address this.

Action plan:

  • If a rung defaults and pays 50 cents on the dollar, you lose 50% of that rung's capital. The ladder will be unbalanced, and you will need to rebalance: either inject new capital or reduce other rungs.
  • If a bond is downgraded but still investment-grade, you can hold it to maturity and accept the loss (if you bought it when it was higher-rated). Or sell and redeploy.
  • Always diversify rungs using multiple bond issuers. A single-bond rung is too risky; use funds or buy multiple bonds per rung.

Tax considerations in laddering​

In a tax-deferred account (401k, IRA, RRSP), laddering is tax-free until you withdraw.

In a taxable account:

  • Coupon income is taxed yearly as ordinary income (unless the bonds are municipal, in which case federal coupons are tax-free).
  • When you sell a bond for a gain or loss before maturity, you realize a capital gain or loss.
  • If you hold to maturity, there is no capital gain or loss (barring credit events).
  • Reinvesting maturing bonds does not trigger a tax event; you simply receive principal and redeploy it.

Ladder advantage in taxable accounts: Because you are holding to maturity, you avoid the constant trading and realization of gains that befall active bond managers. You pay tax on coupons each year, but you do not pay tax on price fluctuations.

If you want to minimize coupon tax, consider holding tax-efficient bonds (municipal bonds if you are in a high tax bracket, Treasury bonds in taxable accounts, and corporate bonds in tax-sheltered accounts).

Next​

With the mechanics understood, the next article walks through a concrete example: the 3-5-7-10 year ladder, one of the simplest and most widely used templates for individual investors.