How do I choose the length of a term life policy?

Match the term to the number of years your family would be financially hurt by losing your income: typically until the mortgage is paid off, the kids are independent, and you've built enough savings to self-insure. Count the years to that point and buy a term at least that long. For young parents that's often 20 or 30 years; for someone a decade from a paid-off house and grown kids, 10 or 15 may be plenty.

Is a longer term always better?

No. A longer term costs more, and coverage you no longer need is wasted money. The goal is to be covered through your years of financial responsibility, then let the policy expire once your family could absorb the loss of your income. Buying 30 years when your obligations end in 15 means overpaying for a decade of protection you don't need.

What happens when my term policy ends?

Coverage simply stops and premiums end. If you've planned it right, that's fine: by then your mortgage is gone, your kids are independent, and your savings cover the gap. If you still need coverage, most term policies can be renewed annually at a much higher rate or converted to permanent insurance, but both are expensive; the better plan is to buy the right length up front.

Should I buy one long policy or stack a few shorter ones?

Laddering, buying several policies of different lengths, lets your total coverage step down as your obligations shrink, which can cost less than one large long-term policy. For example, a 30-year policy for the mortgage plus a 15-year policy for the child-rearing years. It's more paperwork but can be more efficient if your needs clearly decline over time.

How long should your term life insurance be? Choosing a 10, 20, or 30-year policy

Once you know how much term life to buy, the next question is how long. The right length is the number of years your family stays financially dependent on you. Here's how to figure that out and why longer isn't always better.

In short

Choose a term length that matches the number of years your family stays financially dependent on your income: usually until the mortgage is paid off, the kids are grown, and your savings could absorb the loss. Count the years to that point and buy a level-term policy at least that long: often 20 or 30 years for young parents, 10 or 15 for someone closer to those milestones. Longer isn't automatically better. Coverage past the years you're financially responsible is wasted premium. If your obligations clearly shrink over time, laddering two shorter policies can cost less than one long one. Figure out your coverage amount first, then set the length to your timeline.

Once you've used a method like DIME to decide how much term life insurance to buy, one question remains: how long? Term policies come in level lengths (commonly 10, 20, or 30 years) where the premium stays fixed for the whole term and then the policy ends. Picking the length is simpler than it looks, because it isn't really about your age. It's about your timeline of financial responsibility.

The core idea: insure the years you're needed

Term life exists to protect the people who depend on your income for as long as they depend on it. So the right length is the number of years until your family could absorb the loss of your paycheck without hardship. Work backward from the milestones that end your financial obligations:

The mortgage is paid off: the biggest debt your death benefit needs to clear.
The kids are independent: through school and self-supporting, so no future income or education to replace.
Your savings are enough: you've built assets that could stand in for lost income (sometimes called becoming "self-insured").

Count the years to the latest of those, and buy a term at least that long. A 32-year-old with a newborn and a fresh 30-year mortgage is looking at roughly 30 years of responsibility. A 30-year term fits. A 48-year-old with ten years left on the house and teenagers heading to college might need only 10 or 15.

Why longer isn't automatically better

It's tempting to just buy the longest term "to be safe," but that's not free. A longer term costs more, every year, and coverage that outlasts your obligations is money spent protecting a loss that would no longer hurt anyone.

Think of it as a curve that declines over time: early on, you owe a mortgage, have young kids, and little savings: maximum need. Decade by decade the debt shrinks, the kids grow up, and your savings grow: the need falls toward zero. The job of term insurance is to cover the years the need is real, then get out of the way.

The mirror-image mistake is buying a term that's too short to save on premium, then reaching the end still carrying a mortgage and dependents. Renewing an expired term is priced at your new, older age and can cost many times the original, so a too-short policy can force an expensive scramble exactly when your health may no longer qualify you for a cheap new one. Err toward matching your real timeline, not toward the cheapest short option.

Laddering: stepping coverage down as needs shrink

Because your need genuinely declines over time, you don't have to carry one flat amount for the whole period. Laddering means buying two or more policies of different lengths that expire in stages:

A 30-year policy sized to your mortgage.
Plus a 15- or 20-year policy sized to the child-rearing and peak-income-replacement years.

In the early years both are in force, giving you maximum coverage when the need is highest. As the shorter policy expires, your total coverage steps down to match your shrinking obligations, and the combined premium is often lower than one large 30-year policy for the full amount. It's a bit more paperwork, but it can be meaningfully cheaper if your needs decline predictably.

What happens at the end

When a level term ends, coverage stops and so do the premiums. If you planned the length well, that's a non-event: the mortgage is gone, the kids are grown, and your savings cover any gap. Most policies let you renew annually (at a steep, rising price) or convert to permanent insurance (also expensive), but treat those as fallbacks, not the plan. The clean approach is to buy the right length once, at a young enough age to lock in a low level premium.

Key takeaways

Match the term to the years your family depends on your income: mortgage paid, kids grown, savings built.
Young parents often need 20–30 years; those closer to those milestones may need only 10–15.
Longer isn't automatically better. Coverage past your obligations is wasted premium.
A too-short term risks an expensive renewal at older age; err toward matching your real timeline.
Laddering shorter and longer policies steps coverage down as your needs shrink, often for less.

The bottom line

The length of your term policy isn't a guess: it's a countdown to the point where your family no longer needs your income. Find that year by looking at your mortgage, your kids, and your savings, and buy a level term that reaches it. Resist both the "buy the longest to be safe" overspend and the "buy the shortest to save" trap. Get the amount right, get the length right, lock in the level premium while you're young, and your family is covered for exactly the years it matters.

Life Insurance Needs Calculator →

Run the DIME method to size your coverage, then match the term length to your timeline of mortgage, kids, and savings. Free, no email, open source.