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{{Under construction| comment=Discussed in {{Forum post|t=265828|title=Wiki: Backdoor Roth IRA (conversion formula)}}}}
#REDIRECT [[Backdoor Roth]]
A '''Backdoor Roth IRA''' is a technique for contributing to a [[Roth IRA]] when your income exceeds the contribution limit.  There is no income limit on contributing to a nondeductible [[Traditional IRA]], nor on [[Roth IRA conversion|converting]] a Traditional IRA to a Roth IRA.<ref>[https://www.irs.gov/publications/p590a/ch01.html Publication 590-A, Contributions to Individual Retirement Arrangements (IRAs)]</ref>
{{Notice| Read this comprehensive tutorial: [{{{url|http://thefinancebuff.com/the-backdoor-roth-ira-a-complete-how-to.html}}} Backdoor Roth: A Complete How-To], by forum member [[The Finance Buff|tfb]].}}
When you make a Backdoor Roth IRA contribution, you are making a nondeductible contribution (i.e., already taxed) to a Traditional IRA before making a Roth conversion. However, your pre-existing (non-Roth) IRA funds in Traditional, [[SEP]], and [[SIMPLE IRA | SIMPLE IRAs]] will likely all be deductible contributions and their pre-tax earnings. When you make a Roth conversion, you cannot limit your conversion to just your nondeductible contribution.<ref name="529guy">[http://www.bogleheads.org/forum/viewtopic.php?p=2113569#p2113569 ? "caution" section on backdoor Roth wiki], by forum member The529guy, direct link to post.</ref>
When filing your income taxes, the money you convert will be representative of all the money in all of your Traditional, SEP, and SIMPLE IRA accounts, regardless of which account the Roth conversion money comes from.<ref name="529guy" />
For example: If your nondeductible contribution is only 25% of all the money in your Traditional, SEP, and SIMPLE IRA accounts, then only 25% of your Roth conversion amount will be tax-free. The remaining 75% of your Roth conversion amount will represent the deductible (pre-tax) money across all of your Traditional, SEP, and SIMPLE IRAs.<ref name="529guy" />
Consequently, you will owe tax (at your current income tax rate) on 75% of your Roth conversion amount (see example [[#Caution|below]]). If you can transfer your pre-tax IRA funds to a solo 401k, employer-sponsored 401k, or 403b, then they will no longer be subject to taxation during the Roth conversion process.<ref name="529guy" />
To make a backdoor contribution, first make a regular contribution to a Traditional IRA with your IRA custodian.  You do not specify to the custodian whether the IRA is deductible or not; it is just treated as an IRA. Non-deductible simply means that you do not deduct the IRA contribution on your 1040 tax form (the transaction is recorded on form 8606 and submitted with your tax return).
As soon as the contribution posts, convert to a Roth IRA. The Roth account may be existing or new. Accomplish this transaction by selling the shares in your Traditional IRA and using the funds to buy shares (or merely deposit cash) in a Roth IRA.<ref group="note">Vanguard buy / sell account transactions are implemented as a fund exchange. Go to the traditional IRA and select "Exch" which is listed next to "Buy" and "Sell." Identify the shares to be sold. Then select the Roth account on the right hand side, and select the destination fund.</ref>
Since your initial contribution was non-deductible, you pay tax only on the difference between the converted value and the amount contributed, and since you held the Traditional IRA for only a few days, the tax should be trivial.  Thus, even though you are over the limit, you are in essentially the same situation as if you had made a contribution to the Roth IRA.
If you have any other (non-Roth) IRAs, the taxable portion of any conversion you make is prorated over all your IRAs; you cannot convert just the non-deductible amount.<ref>[https://www.irs.gov/retirement-plans/rollovers-of-after-tax-contributions-in-retirement-plans Rollovers of After-Tax Contributions in Retirement Plans], IRS, viewed August 7, 2016.</ref> In order to benefit from the backdoor, you must either convert your other IRAs as well (which may not be a good idea, as you are usually in a high tax bracket if you need to use the backdoor), or else transfer your deductible IRA contributions to an employer plan such as a [[401(k)]] (which may cost you if the 401(k) has poor investment options).
Because IRAs are ''Individual'' accounts, the IRA holdings of one spouse do not affect the proration of the other spouse's conversion, even when filing MFJ.
For example, suppose you have just created a new traditional IRA, and you add $5,000 of non-deductible contributions to it. You'd like to convert this IRA to a Roth IRA via the backdoor.
Suppose you also have another traditional IRA with $15,000 in deductible pre-tax contributions. These contributions may have come from a 401(k) rollover, or from standard deductible traditional IRA contributions from earlier years when you were eligible to make deductible contributions to a traditional IRA.
To compute the tax due, you would need to take $5,000 and divide it by $20,000 (the total value of all your traditional IRAs), to get the percentage of the conversion that will be tax-free. In this case, it is 25%. Therefore, the other 75% of  your conversion--in this case, $3,750--would be taxable.
This can be viewed with the following formula:
'''C''' = Amount to Convert to Roth
'''B''' = Balances of all pre-tax IRAs
'''TF''' = The percentage of the amount you're computing this would be tax-free
TF = 100 * [ C / (C + B)]
Using the numbers from the case study above results in:
100 * [ 5,000 / (5,000 + 15,000) ]
which is 25%.
If the $15,000 traditional IRA could be transferred into a 401(k), then the formula becomes:
100 * [ 5,000 / (5,000 + 0) ]
which is 100%, meaning that 100% of the conversion amount ($5,000) is tax-free.
<references group="note" />
==See also==
*[[Traditional IRA]]
*[[Roth IRA]]
*[[Roth IRA conversion]]
==External links==
*{{Forum post|t=66018|title=Backdoor Roth IRAs Could Cost Some Investors at Tax Time}}
*{{Forum post|p=2748967|title=Funding a backdoor Roth for 2015 in 2016}}, a step-by-step backdoor Roth conversion made easy, by forum member Duckie.
*[http://thefinancebuff.com/the-backdoor-roth-ira-a-complete-how-to.html The Backdoor Roth IRA: A Complete How-To], by tfb (forum member)
*[http://whitecoatinvestor.com/backdoor-roth-ira-tutorial/ BackDoor Roth IRA Tutorial], by [[Jim Dahle]] (forum member EmergDoc)
*[http://www.vanguard.com/pdf/ISGIRA9.pdf The benefits of a "backdoor" Roth], by Vanguard

Latest revision as of 21:32, 3 January 2019

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