Neglecting to withdraw a required minimum distribution (RMD) from an IRA by the due date brings about a painful tax code penalty: 50%. Yes, you read that right. If you are supposed to withdraw at least $4,000 and (uh oh!) did not do as such, you have to write the IRS a check for $2,000. Keep in mind that on January 1, 2020, the RMD rules were modified.

Like many investors, you're likely aiming to build a comfortable nest egg to ensure a comfortable retirement. Among retirement financial planners, this is called the "accumulation phase." In this phase, your goal is to invest wisely by choosing stocks with long-term potential for your retirement portfolio, such as Air Products and Chemicals (APD Quick QuoteAPD - Free Report) , a current top ranked dividend stock.

But there is a second phase of retirement planning that gets less attention, even though it's the more enjoyable part. It's the "distribution phase," which simply means spending the assets you've worked so hard to accumulate.

Planning for the distribution phase is the time where you may make decisions about where you'll want to live in retirement, whether you'll want to travel, hobbies you may pursue, and other decisions that will affect your retirement spending.

Along with those choices, you need to be mindful of the RMD, because it applies to the majority of retirement accounts. This IRS rule requires you to withdraw a specific minimum amount from any qualified accounts you have when you reach a certain age--previously it was 70 1/2, but beginning in 2020, it is 72.

Why does the IRS require these distributions? It's straightforward - they need to ensure they get their tax. In the event that this standard didn't exist, individuals could live off other pay and never pay tax on their retirement investment returns. So, that cash could be left to family or companions as an inheritance without the IRS getting any taxes from you.

Key Facts to Know About RMDs

What types of retirement accounts have RMDs? Qualified retirement accounts such as IRA accounts, 401(k)s, 457 plans and other tax-deferred retirement savings plans like a TSP, 403(b), TSA, SEP, or SIMPLE IRA plan require withdrawals in retirement.

When does it become necessary to begin taking distributions? Your first distribution must be taken by April 1 of the year following the calendar year that you turn 72 (for most accounts). Also, if you retire after that age, you must take your first RMD from your 401(k), profit-sharing, 403(b), or other defined contribution plan by April 1 of the year after the calendar year in which you retire.

For each year after your required starting date, you must take your RMD by December 31. Note that you don't need to take an RMD on a Roth IRA since you covered taxes before contributing. Other varieties of Roth accounts require RMDs. But, there are approaches to avoid them - for instance, you can roll your Roth 401(k) into your Roth IRA.

What will happen if I neglect to take my RMD? If you don't take an RMD, or don't take a large enough distribution, you are liable for a 50% tax on the amount that was not withdrawn in time.

How much cash do I need to withdraw? The RMD you are required to take is calculated by dividing your previous year's December 31st retirement account balance by a "distribution period" factor dependent on your age.

Here's an example to give you an idea of the amount: Ann is 71 and will take her first RMD in the year following the year she turns 72. Her IRA balance at the end of the prior year was $100,000. Her "distribution period" factor is 27.4. Dividing $100,000 by 27.4 equals $3,649.63. This is how much Ann is required to withdraw for her first RMD.

Learning about the "distribution phase" is just one aspect of preparing for your nest egg years.

To learn more about the tax implications of retirement spending - and much more about retirement planning - download our free guide: Retirement Made Easy.