Backdoor Roth IRA Ultimate Guide and Tutorial

Backdoor Roth IRA Ultimate Guide and Tutorial

I’m still getting frequent questions on how to do a Backdoor Roth IRA. So I thought I’d put together a basic step-by-step tutorial people can refer to when they do this. Before I get into it, realize that if you are a low earner you can just contribute DIRECTLY to a Roth IRA and skip this Backdoor Roth IRA process. Low earner is defined as a Modified Adjusted Gross Income under a phaseout range in 2020 of $124,000-139,000 ($196,000-206,000 married) and in 2021 of $125,000-140,000 ($198,000-208,000 married). Some docs like residents or even attendings in the lower paying specialties who are married to a non-earner can just contribute to a Roth IRA directly.

Note also that a Backdoor Roth IRA is primarily a two-step process, an IRA contribution and a Roth conversion. If you understand the rules of both of these steps, putting them together is no problem.

Married physicians should be using a personal and spousal Roth IRA, and will usually need to fund both indirectly (i.e. through the back door). Not only does this provide an additional $6,000 each ($7,000 each if you and your spouse are over 50) of tax-protected and (in most states) asset-protected space for both 2020 and 2021, but it allows for more tax diversification in retirement. That allows you to determine your own tax rate as a retiree by deciding how much to take from tax-deferred accounts and how much from Roth accounts. Remember that IRA stands for INDIVIDUAL Retirement Arrangement. So even  if the pro-rata rule (discussed below) keeps you from doing the Backdoor Roth IRA, it doesn’t necessarily keep your spouse from doing so. Each spouse reports their Backdoor Roth IRA on their own separate 8606, so my tax returns always include two form 8606s.


5 Steps to Making the Backdoor Roth IRA Contribution

Step 1 Contribute to Your Traditional IRA

Make a $6,000 ($7,000 if over 50) non-deductible traditional IRA contribution for yourself, and one for your spouse. You can use the same traditional IRA accounts every year—they just spend most of the time with $0 in it. Most fund companies, including Vanguard, don’t close the account just because there is nothing in it. I do this every January 2nd. Leave it in cash (i.e. a money market fund or settlement fund) while it is in the traditional IRA to keep the math simple. You don’t want any losses or much of a gain between the contribution and conversion step.

Backdoor roth ira steps 2020

2020/21 Contribution Limits

Step 2 Convert the Traditional IRA to a Roth IRA

Next, convert the non-deductible traditional IRA to a Roth IRA by transferring the money from your traditional IRA into your Roth IRA at the same fund company. If you don’t already have a Roth IRA there, you’ll need to open one. This can be done in a minute or two online at Vanguard and is essentially the same process as opening the traditional IRA. I do this the very next day after I make the contribution. It is very straightforward. When you transfer the money, the website will throw up a scary banner saying something like “THIS IS A TAXABLE EVENT”. That’s true. It is taxable. It is just that the tax bill is zero for it since you’ve already paid taxes on the $6,000 and couldn’t claim it as a deduction because you make too much money. You can now invest the money as per your investing plan. You can do step 2 basically immediately after step 1. Some companies will let you do it the same day. Other companies will make you wait until the next day or even a week or so. But there is no reason to wait months to do it.

Step 3 Beware of the Pro-Rata Rule

Get rid of any SEP-IRASIMPLE IRAtraditional IRA, or rollover IRA money. The total sum of these accounts on December 31st of the year in which you do the conversion step (Step 2) must be zero to avoid a “pro-rata” calculation (see line 6 on Form 8606) that can eliminate most of the benefit of a Backdoor Roth IRA.

You can get rid of these accounts in 3 ways:

  1. Withdraw the money (not recommended, as the money would be subject to tax and/or penalties, not to mention DECREASING your tax-advantaged/asset-protected investment space).
  2. Convert the entire sum to a Roth IRA. Only recommended if it is a relatively small amount and you can afford to pay the taxes out of current earnings or taxable investments with relatively high basis.
  3. Roll the money over into a 401(k), 403(b), or Individual 401(k). 401(k)s don’t count in the aforementioned pro-rata calculation. Some physicians have even opened an Individual 401(k) at Fidelity or eTrade (the Vanguard Individual 401(k) doesn’t accept IRA rollovers) in order to facilitate a Backdoor Roth IRA.

Step 4 Fill Out IRS Form 8606 Correctly

The next part of the Backdoor Roth IRA is done months later when you (or your accountant) fill out your IRS Form 8606 on your taxes. Don’t forget to do it or there is a $50 penalty. Remember that you need one form for each spouse. INDIVIDUAL Retirement Arrangements. You need to double-check this to make sure it is done right, even if you hire a pro. Advisors have told me that they have had to help clients fix dozens of these that tax preparers have done improperly. If you don’t do it right, you’ll pay taxes twice on your Backdoor Roth IRA contribution.


Page 1 (below) shows a “distribution” from your non-deductible IRA. Since the money was already taxed, the taxable amount on your distribution is zero. Line 1 is your non-deductible contribution. On Line 2, your basis is zero because you had no money in a traditional IRA on December 31 of last year (if you’ve been carrying a non-deductible IRA for years this may not be zero). Line 6 is zero in a typical year. Note that Turbotax may fill this out a little differently (may leave lines 6-12 blank) but you end up with the same thing. Line 13 is the same as line 3, so tax due is to fill out form 8606

On page 2 (below), you are showing the Roth conversion. I’m not really sure why you have to do this twice (since you’re just transferring the amounts from lines 8 and 11 and then subtracting them), but that’s what the form calls for. As you can see, a Roth conversion of a non-deductible traditional IRA contribution without any gains is a taxable event, it’s just that the tax bill is zero for it.

Backdoor roth IRA Form 8606 pt 2 & 3


When double-checking your tax preparer’s work, you want to concentrate on lines 2, 14, 15c, and 18, and make sure they’re a very small amount, like zero, and not a very large amount, like $6,000. The form can get more complicated if you are doing other Roth conversions at the same time or if you made a contribution for the previous year (i.e. made your 2020 contribution in 2021). See below for more details.

Notice how there is no place on the form to put the date when you made the contribution or the date when you made the conversion. It isn’t on the form your IRA custodian sends to the IRS (1099-R) either.

Harry Sit’s blog, The Finance Buff, has a nice tutorial showing how to fill out form 8606 using Turbotax, which, believe it or not, is trickier than doing it by hand.

Step 5 Repeat Next Year 

Contribute and Convert Each Year

You do not have to wait any period of time between the contribution and conversion. Each year, I make my Traditional IRA contribution on January 2, then convert to a Roth IRA the next day. That gets my investment money working as soon as possible and simplifies the record keeping. Vanguard won’t let you do it the same day, so I have to wait one day anyway. If you find you have a few pennies left in the account and are worried you’ll get pro-rated, take a look at this post: Pennies and the Backdoor Roth IRA.

The Step Transaction Doctrine

There used to be concern that the IRS would have a problem with the backdoor Roth due to an IRS rule called The Step Transaction Doctrine. This rule basically says that if the sum of a bunch of legal steps is illegal, then you can’t do it. Some wondered if this backdoor conversion from traditional IRA to Roth was a legal transaction considering this doctrine. Those concerns, valid or not, are no longer an issue. The IRS clarified in early 2018 that no waiting period is required between the contribution and conversion steps of the Backdoor Roth IRA and essentially has given its blessing on the whole process. Waiting just makes things more complicated on the 8606, as discussed in Pennies and the Backdoor Roth IRA.


Late Contributions to the Backdoor Roth IRA

While it is “cleaner” to make your contribution and your conversion all in the same calendar tax year, you can make your contribution up until your tax filing date of the next year. Late Contributions to the Backdoor Roth IRA has more details about doing this but hasn’t been updated in a while, so let’s do it now. The key to filling out the 8606 correctly when you make a contribution after the calendar year is to recognize that the contribution step is reported for the tax year and the conversion step is reported for the calendar year. So imagine you did the following during the calendar year 2021:

  • Made a 2020 IRA contribution (reported on 2020 8606)
  • Did a Roth conversion of that contribution (reported on 2021 8606)
  • Made a 2021 IRA contribution (reported on 2021 8606)
  • Did a Roth conversion of that contribution (reported on 2021 8606)

Your forms would look like this:

2020 Form 8606 (only have to fill out part I)

backdoor roth ira late contributions 2020

Note that all this serves to do is report basis for the next year. No tax is due. Since no conversion step was done during the calendar year 2020, you only have to fill out lines 1-3 and 14.

2021 Form 8606 (must fill out parts I and II)


Backdoor roth late Contributions 2021Backdoor Roth IRA Late Contributions Pt2

Notice a couple of things here. First, you’ve got to do all of Part I plus Part II for this year because you did the conversion step, unlike last year (2020). Second, don’t get confused by the fact that this form above says “2020” and line 4 asks about 2021. This is the 2020 form but you will actually be filling out the 2021 form. The 2021 form isn’t published yet by the IRS so I had to use the 2020 form for this demonstration. So add one year to anything you see here. Let’s go through this line by line.

physician wellness and financial literacy conference

Part I

Part II

  • Line 16 – Line 8 is $12,000 so $12,000
  • Line 17 – Line 11 is $12,000 so $12,000
  • Line 18 – $12,000 – $12,000 = $0

As simple as this all seems, there are a few ways to screw up the process. Read 17 Ways to Screw Up A Backdoor Roth IRA to see them and How to Fix Backdoor Roth IRA Screw-ups to fix them.

What do you think? Are you doing Backdoor Roth IRAs? Why or why not? Any questions about it? Comment below!