Workplace-based Plans
In the late 1970s, U.S. legislation paved the way for the 401(k) plan—the traditional version of which allows employees to contribute a certain percentage of their pre-tax pay to an account that is specifically earmarked for retirement. That money is typically invested in a mix of securities, like mutual funds, stocks and bonds. The funds in a traditional 401(k) grow tax-deferred throughout your career and then are taxed upon withdrawal in retirement.
A 403(b) plan can function similarly but is specifically for employees of nonprofit or other tax-exempt organizations, such as schools, hospitals and government agencies. There are a few distinctions between 403(b)s and 401(k)s, but the principle of tax-deferral still applies.
One of the advantages of these workplace retirement plans is that many employers will also contribute to them on their workers’ behalf. The structure of this "employer match" varies from organization to organization, but the idea is that for every dollar the employee contributes up to a set percentage of their salary, the employer will match it with specific amount. An example of a formula is a match of 50 cents on the dollar up to 6 percent of the employee’s salary.
Because these accounts come with tax advantages, the Internal Revenue Service (IRS) will only allow you to contribute up to a specified amount each year (and a higher amount in "catch-up contributions" if you are age 50 or older and therefore closer to retirement).