How much money do you really need for retirement: the power of compound interest

do you really need $1.2 billion?

there are many people who need to save for retirement, but they don't know how much they should save. opinions are divided, such as 1 billion won is enough, or it should be much more since we are living to be 100 years old. there are also people who have real estate and financial assets worth 2 billion won, but they are stressed because they are worried about their old age.

according to the results of the 2024 Household Financial Welfare Survey released by Statistics Korea, the appropriate living cost for a retired couple is 336 million won per month. Some people say that if you retire at 60 and live to 90, you need 360 months of living expenses, so you simply multiply 336 million won by 360 months to get 1.2 billion won.

but that's financial illiteracy math. it ignores the basic concept that investing money in financial instruments earns a return. When you apply the principle of compounding, the actual retirement fund needed is much less.

recalculating with a compounding withdrawal strategy

let's say you have 1.2 billion won in assets and they earn an average return of 5% per year. If you withdraw 40 million won on January 1 of each year, your assets will be reduced to 11.6 billion won. however, that 11.6 billion won earns 5% in one year and grows to 12.18 billion won the next year.

amazingly, even if you continue to withdraw 40 million won every year, your 1.2 billion won retirement fund won't be depleted, it will grow, and in 30 years it will be worth 2.4 billion won, double the original amount. this is the magic of compounding.

to reach zero in 30 years, you'd need to withdraw 644 million won per month, and to reach zero in 40 years, you'd need to withdraw 578 million won per month, which is much more than the 3.36 million won you need to live on.

on the other hand, to withdraw 3.36 million won per month for 30 years, you would need 6.3 billion won. that's about half of the 1.2 billion won calculated by simple multiplication.

how to easily calculate your retirement fund with a loan calculator

there is an easy way to do these complex calculations. just search the internet for a loan calculator. for the loan amount, enter the principal amount of your retirement assets, for the loan term, enter the number of years until your assets go to zero, and for the loan rate, enter the average annualized return. for the repayment method, select equalization and hit the calculate button to get the amount you can withdraw each month.

repaying a loan and withdrawing from an asset are mathematically the same thing. the only difference is who gives the money to whom. by playing around with the numbers in the loan calculator, it's easy to see how much you'll need to accumulate in assets to provide for your needs during retirement.

adding the national pension and retirement pension

if you want to increase your standard of living to $500,000 per month, you'll need to consider other sources of income. most working people have a public pension, such as a national pension or government pension. if you've been working for some time, you should receive at least 1 million won per month.

there are also severance pay or retirement pensions. if you retire after 30 years of service with a final salary of 80 million won, you will receive about 200 million won in severance pay. if you invest it at 5% per year and plan to run out after 30 years, you can withdraw 1.07 million won per month.

combined with about 2 million won from the national pension and retirement pension, and 336 million won from assets of 700 million won, you can live on more than 5 million won per month. if you also utilize a housing pension, you can further reduce the amount of financial assets you need.

risks to consider when preparing for retirement

of course, there's no guarantee that you'll live past 100, or that you'll earn an average of 5% per year, or that you'll be able to leave a legacy for your children, or that you'll have unexpectedly large expenses. the calculations above don't take these variables into account, so it's wise to have some cushion.

frequently asked questions

Q How much do I need to save for retirement?

A If you withdraw 3.36 million won per month for 30 years, you'll need about 6.3 million won. the actual amount you need may be lower if you consider national pension and retirement pension.

Q What should I assume is the compounding rate of return?

A To be conservative, it's reasonable to assume 4 to 5 percent per year. this is based on the long-term average return of a diversified portfolio.

Q Why use the loan calculator to calculate my retirement savings?

A Because the math is the same for loan repayments and asset withdrawals. Calculating on an amortized basis makes it easy to see how much you can withdraw each month.

Q How does a home annuity help me prepare for retirement?

A A home equity annuity allows you to cash out your property, which can significantly reduce the amount of financial assets you need.

wrapping up

don't be intimidated by the idea of needing $1.2 billion for retirement. with the power of compound interest, it's possible to have a secure retirement with half the assets. use our loan calculator to calculate your own retirement fund based on your own situation.

if you have any questions, let us know in the comments. if you'd like more information about saving for retirement, subscribe and set up notifications to get new articles delivered right to your inbox.