The DIME Method: A Simple Starting Point
The DIME method is a widely used framework for calculating your life insurance needs. Add together:
- D — Debts: All outstanding debts excluding your mortgage (loans, credit cards, car finance)
- I — Income: Your annual income multiplied by the number of years until your youngest child is financially independent (typically age 21)
- M — Mortgage: The outstanding balance on your mortgage
- E — Education: Estimated future education costs for your children
This total is your DIME figure — a reasonable starting point for the sum assured you need.
The 10x Salary Rule
A simpler rule of thumb widely used in the UK: insure yourself for 10 times your annual gross salary. For a salary of £40,000, this means £400,000 of cover.
This rule is a useful benchmark but does not account for your mortgage, specific debts, or whether you have dependants. Use it alongside the DIME method for a more accurate estimate.
Calculating Your Life Insurance Needs by Goal
If Your Primary Goal Is Mortgage Protection
Insure at least your outstanding mortgage balance. Use a decreasing term policy aligned to your mortgage term — this is the most cost-effective approach. Many people also add a level term element to cover living expenses beyond the mortgage.
If Your Primary Goal Is Income Replacement
Multiply your annual income by the number of years until your youngest child is financially independent. Add your mortgage balance and any other debts. A level term policy is most appropriate here.
If Your Primary Goal Is Inheritance Planning
Consider whole of life insurance, which guarantees a payout whenever you die. A common use is to cover an anticipated inheritance tax bill, so your beneficiaries receive the full estate rather than a depleted one.
If Your Primary Goal Is Funeral Cost Cover
A sum of £10,000–£15,000 is typically sufficient to cover a UK funeral and associated costs. An over-50s plan or a small whole of life policy is most suitable for this purpose.
Factors That Reduce the Cover You Need
- Your partner's income (the higher their income, the less of a shortfall your death would create)
- Existing savings and investments (your family's financial buffer)
- Death in service benefit from your employer (typically 2–4× salary)
- State death benefits (including Bereavement Support Payment)
- Pension death benefits payable to your dependants
Common Mistakes When Choosing a Sum Assured
- Underinsuring: The most common mistake. Choosing a low premium over adequate cover.
- Covering only the mortgage: This leaves family living expenses unprotected.
- Forgetting to account for inflation: Consider an increasing or indexed policy if cover will run for 20+ years.
- Ignoring existing cover: Don't double-count employer death in service benefit or existing policies.
Should I Have Multiple Life Insurance Policies?
Yes — many people hold more than one policy, each designed for a specific purpose. For example: a decreasing term policy to cover the mortgage, a level term policy for income replacement, and a whole of life policy for inheritance planning. There is no limit to the number of policies you can hold, provided the total sum assured is proportionate to your financial needs.
Frequently Asked Questions
The most common rule of thumb is 10× your annual salary. A more accurate approach is the DIME formula: Debts + Income replacement + Mortgage + Education. Your adviser will calculate a tailored recommendation based on your specific financial obligations and goals.
Technically no — insurers assess whether the sum assured is proportionate to your financial needs and won’t insure you for more than you can justify. In practice, the far more common problem is underinsurance, where people choose a lower sum assured to reduce the monthly premium.
It depends on the policy. A decreasing term policy is designed to track a repayment mortgage balance, reducing over time. A level term policy pays a fixed lump sum. For interest-only mortgages, level term cover is generally more appropriate as the mortgage balance does not reduce over time.
You have two options: a joint life policy (cheaper, covers both lives, pays out once on the first death) or two separate single policies (more expensive but each pays out independently). For couples with dependants, two single policies usually provide better overall protection, though the cost difference is worth discussing with your adviser.