If you want $50,000 a year in passive dividend income, you need a portfolio of $1 million with a 5% dividend yield.

But is that enough to retire on?

At age 30, some financial professionals suggest accumulating the equivalent of your current annual income.

By age 40, you should have accumulated three times your current income for retirement.

By retirement age, it should be 10-12 times your income at that time to be reasonably confident that you'll have enough funds.

How much do you think you need to retire?