What is a 401K and What is a IRA?

In the United States, a 401(k) plan is the tax-qualified, defined-contribution pension account defined in subsection 401(k) of the Internal Revenue Code.[1] Under the plan, retirement savings contributions are provided (and sometimes proportionately matched) by an employer, deducted from the employee’s paycheck before taxation (therefore tax-deferred until withdrawn after retirement or as otherwise permitted by applicable law), and limited to a maximum pre-tax annual contribution of $18,000 (as of 2015)The different parts of Medicare help cover specific services:

An individual retirement account (IRA) that allows individuals to direct pretax income, up to specific annual limits, toward investments that can grow tax-deferred (no capital gains or dividend income is taxed). Individual taxpayers are allowed to contribute 100% of compensation up to a specified maximum dollar amount to their Traditional IRA. Contributions to the Traditional IRA may be tax-deductible depending on the taxpayer’s income, tax-filing status and other factors.