One 30-year term policy or a ladder of three: cost and risk compared

A ladder of three term policies usually costs less in total than one big 30-year policy, because it buys the large amounts of coverage only for the years you are likely to need them. The single policy wins on simplicity and on guaranteeing the same death benefit for the full 30 years. Which is better depends on whether your need really shrinks over time, and on how much you value having one contract instead of three.

The numbers in this article are hypothetical illustrations with round figures. They are chosen to show how the comparison is built, not to suggest what any insurer charges. Your quotes will differ, and the order of the results can differ too.

The two designs

A single policy is one term life insurance contract with a fixed amount and a fixed length, for example $900,000 for 30 years. The premium is level, meaning it does not change during the term.

A ladder is several policies bought at the same time with different lengths and often different amounts, so that coverage steps down as time passes. A common three-rung ladder is a 10-year, a 20-year and a 30-year policy of equal size. Coverage is three layers at the start, two layers after year 10 and one layer after year 20. The laddering term life policies to match your needs guide explains the idea in general. The term life ladder builder tool lets you test amounts and lengths.

Ladders are sometimes also built by buying one policy now and another later. That is a different strategy, with a different risk, and it is covered near the end.

Why the question arises

Most family needs shrink. A mortgage balance falls every year. Children grow up and leave. Savings accumulate. A household that needs $900,000 of coverage at 35 may need $600,000 at 45 and $300,000 at 55. A single policy sized for the first number is oversized for most of its life, and the premium reflects that.

If your need does not shrink, the ladder loses its main advantage. Someone who has a lifelong dependent or a permanent obligation will usually need the same amount all the way through.

The illustrated household

Say a couple, both healthy and 35, has two young children and a mortgage. They work out that they would need about $900,000 of replacement coverage on the main earner now, about $600,000 once the oldest child is through school and the mortgage is much lower, and about $300,000 in their mid-50s. We will compare two ways to buy this for the main earner, using invented premiums.

Option A: one policy. $900,000, 30 years, at an illustrative $100 a month.

Option B: a ladder of three. $300,000 each:

• 10-year policy at an illustrative $18 a month.
• 20-year policy at an illustrative $25 a month.
• 30-year policy at an illustrative $38 a month.

Why would three policies of $300,000 cost less than one of $900,000? In this illustration the answer is that the 10-year and 20-year policies are cheap per dollar, and they drop off. Real quotes follow the same general pattern: longer terms cost more per dollar of coverage, because the insurer takes on more risk of death at older ages.

The arithmetic

Ladder premiums by period:

Total cost over 30 years, each period being 120 months:

• Years 1 to 10: $81 × 120 = $9,720.
• Years 11 to 20: $63 × 120 = $7,560.
• Years 21 to 30: $38 × 120 = $4,560.
• Ladder total: $9,720 + $7,560 + $4,560 = $21,840.

Single policy total: $100 × 360 months = $36,000.

The ladder is $36,000 − $21,840 = $14,160 cheaper in this illustration. In the early years, the ladder costs $19 less per month ($100 − $81). In years 11 to 20 it is $37 less per month, and in years 21 to 30 it is $62 less per month.

What you give up for that saving

The ladder also provides less coverage later:

The ladder is cheaper because it assumes your need falls. If your need stays at $900,000, the two options are not comparable, and the single policy is the only one that delivers. If your need follows the plan, the ladder gives the same protection when it is needed and the single policy over-delivers in later years.

A table to weigh both routes

What each design pays, depending on when the insured dies

Totals tell you what you spend. The other half of the comparison is what your family receives. Using the same illustration, here is the death benefit paid in four different years:

The premium column is a plain multiplication: five years of $100 is $6,000, five years of $81 is $4,860, and so on. In year 15, for example, the ladder insured paid ten years at $81 and five years at $63: $9,720 + $3,780 = $13,500.

Two things stand out. First, the difference in benefit is zero for the first ten years, which is when the family is most exposed. Second, the benefit gap widens only later, when the plan assumes the need has shrunk. Whether that assumption holds is the question to ask yourself honestly. A mortgage on a fixed schedule and children who will be independent by a known age make the assumption easy to defend. An open-ended obligation does not.

Notice also the last row. Neither design pays anything after year 30. Both leave the same unanswered question for the final years: what protects the family if you live past the term and the need has not ended? The converting term life to permanent: how the conversion option works guide covers one answer, and the renewing term life insurance after the level period ends guide covers the cost of another.

A ladder shaped to the need, not to equal thirds

The equal-thirds ladder is the easiest to explain, but real needs rarely fall in equal steps. Suppose the couple decides that the long tail of their need is larger than a third, because the youngest child will not be independent until the 20-year policy is almost over and because they want a cushion for the surviving spouse's retirement years. They could shape the ladder this way, again with invented premiums:

• 30-year policy: $400,000 at $48 a month.
• 20-year policy: $300,000 at $25 a month.
• 10-year policy: $200,000 at $13 a month.

Coverage steps from $900,000 in years 1 to 10, to $700,000 in years 11 to 20, to $400,000 in years 21 to 30. The premium is $86 a month in years 1 to 10, $73 in years 11 to 20 and $48 in years 21 to 30.

• Years 1 to 10: $86 × 120 = $10,320.
• Years 11 to 20: $73 × 120 = $8,760.
• Years 21 to 30: $48 × 120 = $5,760.
• Total: $10,320 + $8,760 + $5,760 = $24,840.

Compared with the equal-thirds ladder at $21,840, this version costs $3,000 more over 30 years and provides $100,000 more coverage in years 11 to 20 and $100,000 more in years 21 to 30. It still costs $11,160 less than the single policy at $36,000. The lesson is that a ladder is a family of designs. You can pick the shape that matches your need, and the saving shrinks as the shape moves toward the single policy.

The risks that never show up in a premium table

Repricing risk

Repricing risk means being forced to buy coverage again at a higher price. A ladder bought all at once has little of it, because each rung is locked in at today's age and health. The risk is in the other kind of ladder: if you buy only a 10-year policy now and plan to buy more later, you are betting that you will still be insurable and that prices will be acceptable. If your health changes in the meantime, the later purchase may cost much more, be rated, or be declined.

A single 30-year policy has the least repricing risk of all, because there is nothing to buy again. That is the main thing the extra money buys.

Need risk

Need risk is the chance that your need turns out different from the plan. A second child, a larger mortgage, a business or a lasting health condition in the family can leave you wanting the full $900,000 for longer. A ladder that ends rungs on schedule leaves you short. A single policy covers the surprise at the cost of overpaying if it never comes.

One way to reduce this risk is to make the top rung longer. For example, make the longest policy larger than one-third of the total need. Another is to confirm that each policy has a conversion privilege and know the deadline, so that you can convert part of a rung to permanent coverage if a lasting need appears.

Lapse and administration risk

Three contracts mean three bills, three sets of notices and three places where the address or the card can go stale. They also mean three beneficiary forms. If the ladder is held with one insurer, many of these chores can be combined, but the contracts are still separate. If the family does not know all three exist, a claim can be missed. The simple fix is a one-page list kept with your important papers. A short checklist like this works:

1. Insurer and policy number for each rung.
2. Face amount and end date of each rung.
3. Beneficiaries on each, with a contingent named.
4. Payment method and due date.
5. Conversion deadline for each rung.

The insurer's solvency and the guaranty backstop

A ladder with several insurers spreads exposure to any one company's financial trouble, but it adds complexity. A ladder with one insurer is simpler. State guaranty associations back policies up to limits that differ by state, with a common baseline of $300,000 in death benefits per insured life per insurer. If you use one insurer for $900,000, part of the total could be above that baseline in a rare insolvency, which is one reason some people divide coverage among companies. That event is rare, and the AM Best, S&P, Moody's and Fitch ratings explained guide covers how to judge a company. Check your state's guide for the limit that applies.

A middle option: two policies

You do not have to pick between one and three. Two policies of different lengths can capture much of the saving with half the paperwork. In the illustration, a $600,000 30-year policy and a $300,000 20-year policy would give $900,000 for 20 years and $600,000 for the last 10, but would not step down at year 10. Run both shapes through the How long a term do I need? and compare. The how long a term should you buy: 10, 20 or 30 years guide explains how to choose lengths from what you are insuring: a mortgage, children's dependence, a spouse's retirement.

How to build a comparison with real quotes

1. Define the need by period. Write down how much you need in years 1 to 10, 11 to 20 and 21 to 30, and why.
2. Request quotes for each piece from the same insurer or comparable ones: three single-length policies and the one big policy, same health class.
3. Add up the totals as above, using monthly premiums and months in force.
4. Check the quotes are comparable. Same rate class, same riders, same payment frequency. The what to compare between term policies besides price guide lists the traps.
5. Check the conversion rights on each policy, including the deadline for the longest one.
6. Look at the insurer's lower limits. Very small policies sometimes carry a policy fee that makes them less efficient. In that case the ladder's rungs may be pricier per dollar than they appear, and the comparison should use real quotes, not rule-of-thumb figures.
7. Decide using the list below.

A decision list

• If your need clearly shrinks and you can manage three contracts, a ladder is likely to cost less and fit better.
• If your need is constant for 30 years, or you cannot predict it, a single policy is simpler and safer.
• If you are very likely to need coverage longer than 30 years, consider a longer-lasting form. See 30-year term life insurance: pros and cons for what a 30-year contract covers and what it does not.
• If you hesitate between two designs, consider the two-policy middle option.
• If you have a health condition that may worsen, favor buying the longer coverage now rather than planning to buy later.
• If you are older, check that a 30-year term is even available at your age.

A fee-only planner can help model the numbers, and a licensed agent can supply real quotes. Neither should push you toward a design you cannot explain in a sentence.

Key takeaways

• A ladder usually costs less in total because the large coverage amounts are bought only for the years they are needed; in the illustration it saved $14,160 over 30 years.
• The saving comes with less coverage in later years, so the ladder only works if your need really falls.
• A single policy has the lowest repricing risk and the simplest administration, while a ladder is more flexible because each rung can be dropped alone.
• Three contracts mean three bills, three beneficiary forms and three conversion deadlines, so keep a one-page list.
• Compare designs with real quotes for the same health class and riders, not with rules of thumb.