Here are some formulae to help in your financial journey! None of these rules is infallible, so consider them as guides, not real rules!
1. Rule of 72 (Years It Will Take To Double Your Money)
2. Rule of 114 (Triple your money)
3. Rule of 144 (Quadruple your money)
4. Rule of 70 (Inflation)
5. The 4% Withdrawal Rule (Suggested Safe Rate of Withdrawal)
6. The 100 Minus Age Rule (Suggested Asset Allocation)
7. The 10, 5, 3 Rule (Expected Returns)
8. The 50-30-20 Rule (Guide to Budgeting)
9. The 3X Emergency Rule (How Much Do You Need for an Emergency)
10. The 40% EMI Rule (Maximum Amount You Should Pay as EMI)
11. The Life Insurance Rule (How Much Life Insurance Do You Need)
1. Rule of 72
Eg. To know how long it will
take to double your money at 8% interest, divide 72 by 8 to get 9 yrs
At a 6% rate, it will take 12 yrs
At a 9% rate, it will take 8 yrs
2. Rule of 114
For example, if you want to know how long it will take to triple your money at 12% interest, divide 114 by 12 and get 9.5 years
At 6% interest rate, it will take 19yrs
3. Rule of 144
No. of years required to quadruple your money at a given rate, divide 144 by interest rate.
For example, if you want to know how long it will take to quadruple your money at 12% interest, divide 144 by 12 and get 12 yrs.
4. Rule of 70
Divide 70 by current inflation rate to know how fast the value of your investment will get reduced to half its present value.
Inflation rate of 7% will reduce the value of your money to half in 10 years.
5. The 4% Rule for Financial Freedom
Corpus Required to retire on = 100 divided by what you consider a safe rate of withdrawal. If 4% is your safe rate of withdrawal, you need 25 times of your estimated Annual Expenses.
If your annual expense after 50 years of age is 500,000 per year and you wish to retire, then the corpus you require is 1.25 cr.
Put 50% of this into fixed income & 50% into equity.
Withdraw 4% every year, i.e. 500,000.
6. The 100 minus your age rule
This rule is used for asset allocation. Subtract your age from 100 to find out, how much of your portfolio should be allocated to equity.
Suppose your Age is 30, then (100 - 30 = 70)
Equity : 70% Debt : 30%
But at Age 60, you should hold 100 - 60 = 40 in equity.
Equity : 40% Debt : 60%
One should have reasonable returns expectations
10% Rate of return - Equity / Mutual Funds
5% - Debts ( Fixed Deposits or Other Debt
instruments)
3% - Savings Account
8. The 50-30-20 Rule - a Guide to Budgeting
50% - Needs
(Groceries, rent, EMI, etc.)
30% - Wants
(Entertainment, vacations, etc.)
20% - Savings (Equity, MFs, Debt, FD, etc.)
Try to save at least 20% of your income (50% if you are single and have no responsibilities)
Save more if you can, your day of financial freedom will arrive much more quickly!
9. The 3X Emergency Rule - Your Emergency Cushion
Always put at least 3 times your monthly income in an Emergency Fund for emergencies such as loss of employment, a medical emergency, etc. If you are self employed and your cash flow is unpredictable, you will need a bigger cushion.
Save this fund in liquid or near liquid assets - these should be readily accessible.
10. The 40% EMI Rule - Maximum You Should Pay as EMI
Your expense on EMIs should be within 40% of your income, at the maximum. Finance companies will not generally lend you more! But of course, if you can postpone your expenses and save more, your day of financial freedom comes earlier.
So if you earn 50,000 per month, your EMIs should not be more than 20,000.
11. Life Insurance Rule - How Much Life Insurance
Always have a Sum Assured of 20 to 25 times of your Annual Income to provide for your dependents. This amount will depend on your current savings, whether your spouse has an income, how old your children are, what you need to provide for the care of your parents and so on.
If your expenses are 500,000 annually, you should have 1.00 to 1.25 crore in insurance if you have no savings, your wife has no income and if your children are young.
Which type of insurance (whole life, market linked, term or other) is another big question. If you are interested in a blog post on this topic, please post a request in the comments below.