Calculate How Much Life Insurance You Need

How much life insurance do you need? The fastest starting point is a salary multiplier: take your annual income and multiply it by a set number based on your circumstances. It's the method most comparison sites quote because it takes seconds to work out and doesn't require you to know exact figures for your mortgage or family costs.

The multiplier you use should reflect what your family would actually lose if your income stopped. Someone with no mortgage and no dependants might only need 5 to 10 times their salary, enough to cover their own debts and funeral costs. A homeowner with a mortgage but no children typically needs closer to 10 times income, enough to clear the mortgage and leave some income replacement behind. A sole earner with young children usually needs 10 to 15 times income or more, because that income has to stretch further and for longer.

This shortcut works as a starting figure, not a personalised one. It ignores your actual mortgage balance, existing debts, number of children and any employer death-in-service benefit you already have. If you want a number tailored to your situation rather than a rough guess, the DIME method below gets you there in about 10 minutes, building on the wider life insurance options covered in our main guide.

A salary multiplier gets you a ballpark figure fast, but it can't account for your actual mortgage balance, your specific debts or how many years your family would need your income replaced. A proper cover calculation adds up what your family would need to pay off or replace, then subtracts anything you already have in place.

To work out a personalised figure, you need five pieces of information: your outstanding mortgage balance, any other debts such as credit cards, car finance or personal loans, your monthly living costs multiplied by the number of years you want covered, an estimate for funeral costs, and the value of any existing life cover or savings you'd want to deduct from the total. SunLife's Cost of Dying Report puts the average UK funeral at around £4,000, rising towards £9,000 once a wake, flowers and a headstone are included, so it's worth building that in rather than assuming the state will cover it.

Add the first four figures together, subtract the last one, and you have a cover amount that reflects your actual finances rather than a flat multiple of salary. Once you have that number, the next question most people ask is how much life insurance costs for that level of cover, which depends heavily on your age and health.

DIME is the method insurance advisers use to size cover properly, and it stands for Debt, Income, Mortgage and Education. Instead of guessing a multiple of your salary, you add up four separate categories of financial need and arrive at a total that's specific to your household.

• Debt: Any borrowing outside your mortgage, credit cards, car finance, personal loans, that your family would otherwise have to keep paying or clear from your estate.
• Income: Your annual take-home pay multiplied by the number of years your family would need it replaced, often 10 to 15 years or until your youngest child becomes financially independent. Some people prefer this paid as an ongoing income rather than a lump sum through a family income benefit policy.
• Mortgage: The full outstanding balance on your mortgage, so your family isn't forced to sell the home to clear it.
• Education: Future school trips, university tuition and living costs for any children, which Child Poverty Action Group research suggests can run into tens of thousands of pounds per child by the time they finish full-time education.

Here's how it works for Sarah, a 34-year-old sole earner on £38,000 a year with a £180,000 mortgage, a £6,000 car loan and two children aged 4 and 7. She wants 10 years of income replaced and has budgeted £25,000 per child for future education costs, with £76,000 of existing death-in-service cover and savings to deduct.

Both methods get you to a cover figure, but they suit different people. A salary multiplier takes seconds and works fine as a rough guide if you're young, renting and have no one financially dependent on you. It falls down quickly once you have a mortgage, children or debts, because a flat multiple of income doesn't know your mortgage is £180,000 rather than £80,000, or that you have two children rather than none.

DIME takes longer, usually 10 to 15 minutes if you have your mortgage statement and a rough idea of your outgoings to hand, but the number it produces is tied to your actual financial commitments rather than an industry average. As a general rule, use a multiplier for a fast ballpark and switch to DIME, or a calculator that applies the same logic, as soon as you have a mortgage, a partner or children relying on your income.

The right cover amount also depends on your life stage, not just your income. A young family with a large mortgage has very different priorities to a single person renting with no dependants, even if they earn the same salary.

If you're buying a home with a partner, your main priority is usually making sure the mortgage gets cleared and your partner isn't left covering it alone. Our guide to life insurance for your mortgage covers how to match cover to your mortgage term. Single parents typically need to prioritise income replacement and childcare costs above everything else, since there's no second income to fall back on. Couples without children usually need enough to cover shared debts and give the surviving partner breathing room, rather than decades of income replacement.

If you're over 50, guaranteed acceptance policies work differently, they're designed for funeral and small debt costs rather than income replacement, and our over 50s life insurance guide explains the trade-offs. Self-employed workers should also budget for a few months of business overheads on top of personal costs, since there's no employer death-in-service benefit to fall back on. Our life insurance for the self-employed guide covers this in more detail.

How much cover you need is only half the equation, how long it lasts matters just as much. Term length should match the point at which the need for cover actually ends, not an arbitrary round number.

If cover is protecting your mortgage, match the term to your remaining mortgage term. Most residential mortgages run 25 to 35 years, though yours may have less left if you're partway through. A decreasing term life insurance policy is often the cheapest option here because the payout falls in line with your reducing mortgage balance. If cover is protecting your children, set the term to run until your youngest turns 18, or 21 if you want to cover them through university. A straightforward term life insurance policy with a level payout suits this better, since your family's income needs don't shrink the way a mortgage balance does. Getting the term wrong in either direction means paying for cover you no longer need, or letting it lapse just before you actually need it.

Your cover needs will change as your life does, so treat the figure you land on today as a starting point rather than a permanent decision. Reviewing it after major changes stops you from being underinsured, or paying for cover you've outgrown.

• New mortgage or remortgage: A larger mortgage or a new lender usually means your existing cover no longer matches your outstanding balance.
• New baby: Each additional child adds to the income and education components of your calculation.
• Marriage or a new partner: Shared finances and dependants change what your household would lose.
• Pay rise or new job: A higher income raises the income-replacement figure in both the multiplier and DIME calculations.
• Becoming self-employed: You lose any employer death-in-service benefit, which often needs replacing with extra personal cover.

A quick review takes minutes and costs nothing, but leaving a mismatch in place for years is the more expensive mistake.

Most underinsurance comes down to a handful of repeated mistakes rather than genuinely difficult decisions. Knowing what to watch for takes a few minutes and can save your family a significant shortfall.

• Using a salary multiplier with a large mortgage: A flat 10x income figure can leave a six-figure gap if your mortgage balance is unusually high for your income.
• Forgetting funeral and probate costs: These land immediately, often before other assets or cover payouts have cleared, and can run to several thousand pounds.
• Ignoring a partner's income loss: Couples often insure only the higher earner, leaving a gap if the lower earner dies and childcare costs replace their contribution.
• Not deducting existing employer cover: Many employees already have 2-4x salary in death-in-service benefit, and forgetting to subtract it means over-insuring and overpaying.
• Buying cover for life instead of matching the term: Whole of life policies cost significantly more than term cover for the same payout, and most needs, a mortgage, raising children, have a clear end date.

This guide provides general information rather than regulated financial advice. If your situation involves multiple properties, a business or a blended family, speak to a qualified adviser before settling on a figure.