34-year-old Rahul earns ₹18 lakh a year and he bought a term plan of ₹50 lakh right after his wedding. That was after an agent asked him to buy a cover ten times his salary. Six years later, he has a home loan of ₹62 lakh and a four-year-old daughter. His mother also lives with him and has no income. That ₹50 lakh would not even clear his home loan if something happened to him tomorrow. His income never changed, but his life did.
This is the real question most people get stuck on when they sit down to buy a policy: do you size your cover to your income, your monthly expenses, or the debts and future costs in your name?
Each method gives a different number, sometimes a very different one, and picking the wrong one is how families end up underinsured. If you are planning to buy term insurance this year, the method you use matters more than the insurer you pick.
What Happens If You Calculate Cover Using Only Your Income?
The income multiple method is the one most people have heard of. Multiply your annual income by 10 to 15, depending on your age. That gives a cover of ₹1.8 crore to ₹2.7 crore on an income of ₹18 lakh.
It is easy to calculate and works fine for a single income household with average liabilities. But it says nothing about what your family actually owes or spends. Two people earning the same salary can have very different financial lives, one with a paid off house, the other with a fresh home loan and two aging parents. The income method treats them identically, which is its main weakness.
What Happens If You Base Cover On Your Monthly Expenses Instead?
Here you estimate your family’s monthly household expenses, multiply by 12, then again by the number of years your dependents will need that support. Rahul’s family spends ₹90,000 a month, and his daughter is 4, so that is roughly 21 years if you plan support until she is 25.
₹90,000 x 12 x 21 comes to about ₹2.27 crore, before inflation. Its weak point is that it can undercount one-time costs like a wedding, higher education abroad, or a medical emergency outside the monthly budget.
What About Calculating Cover From Your Outstanding Liabilities?
This is the narrowest method. You simply add up what you owe: home loan outstanding, car loan, personal loan, credit card balances, and any loan you have co-signed for someone else. For Rahul, that would be his ₹62 lakh home loan plus a small personal loan, so roughly ₹65 lakh.
This protects your family from losing the house or being chased by lenders, which matters, but it stops there. It says nothing about daily living costs, your child’s school fees next year, or the fact that your mother needs monthly support. Used alone, it almost always underestimates the real number.
Once you have a clearer idea of the financial responsibilities your family needs to manage, choose a good term cover to help protect them.
So Which Method Should You Actually Use?
None of the three should be used alone. A useful cover number adds the pieces together: outstanding liabilities, plus future goals such as a child’s education or marriage, plus income replacement for the years until your youngest dependent is financially independent, minus existing savings and investments you could liquidate if needed.
How Do You Work Out The Actual Number For Your Situation?
Using Rahul’s numbers: liabilities of ₹65 lakh, an education and marriage goal fund of roughly ₹80 lakh for his daughter, and income replacement of about ₹2.27 crore. Add these, and you get close to ₹3.7 crore. Subtract his mutual fund and PF balance of about ₹40 lakh, and his family needs cover close to ₹3.3 crore, more than six times what he currently holds.
This is exactly the kind of calculation a life insurance calculator is built for. Plugging in your income, expenses, existing loans, and dependents into one gives you a working number in minutes instead of a rough guess based on someone else’s rule of thumb.
One adjustment worth making here is to build in inflation for goals that are 10 or more years away. Education costs in India have historically risen faster than general inflation, and many planners inflate long-term goals like education and marriage by 8% to 10% a year rather than using today’s fees as the final number.
What Does This Look Like As A Decision Table?
| Your Situation | Method to Lean On |
| Single, no loans, aging parents depend on you | Expense-based |
| Home loan plus young children | Liabilities plus income replacement |
| Sole earner in a large joint family | All three combined, reviewed every 2 to 3 years |
| Dual income household, shared expenses | Income multiple, split with your partner’s cover |
| Business owner with debt in personal name | Liabilities first, then income replacement |
Who Should Not Simply Follow The Income Multiple Rule?
A few groups should be cautious about relying on income alone.
- Anyone with a large home loan taken in the last few years.
- Someone supporting parents or in-laws with no independent income or pension.
- Freelancers and business owners whose income swings year to year, since a multiple of a good year or a bad year both mislead.
- A person who has co-signed a loan for a sibling or parent.
What Should You Do Next?
Do not carry forward a cover amount from years ago just because it once made sense. Sit down with your current loans, monthly expenses, your dependents’ ages, and your existing savings, run them through a life insurance calculator, and see where the number actually lands.
If it is higher than what you hold today, look at whether to buy term insurance as an additional policy rather than replacing what you already have, since your older policy often carries better terms from when you were younger and healthier.
