Are you self-employed? Is your self-employment income your primary source of income? If so, you might want to consider doing a Roth conversion before the end of the year.

Why? Because of the still relatively new qualified business income (“QBI”) deduction (also known as the Section 199A deduction). 

QBI Deduction and Initial Limitation

Starting in 2018, there is a deduction for “qualified business income.” This is generally income from a qualified trade or business received from a sole proprietorship (and reported on Schedule C), from a partnership, or from a S Corporation (in these cases, generally reported to the taxpayer on a Form K-1 and reported on the Schedule E with the tax return). 

Important for this purpose is the initial limit on the QBI deduction. It is the lesser of following two amounts:

1. 20 percent of taxable income less “net capital gain” which is generally capital gains plus qualified dividend income (“QDI”) (the “Income Limit”) or
2. 20 percent of QBI (the “QBI Limit”).

As a practical matter, in most cases the limit will be determined by the second limitation (such taxpayers are what I call “QBI Limited”). Many taxpayers will have much more taxable income than they have QBI. Consider spouses where one has self-employment income and the other has W-2 income. Unless the W-2 income is very small, their combined taxable income is likely to be in excess of their combined QBI, and thus they will be QBI Limited.

Alternatively, consider a situation where a single person has QBI from an S corporation (say $50,000) and the S corporation also pays him or her a W-2 salary (say $60,000). In such a case the QBI is $50,000 (20% of which is $10,000) and the taxable income might be $97,450 ($110,000 total from the S corporation less a $12,550 standard deduction), 20% of which is $19,490. This taxpayer would also be QBI Limited. 

Income Limited

But what if you are not QBI Limited, but rather, limited by the Income Limit listed above (what I call “Income Limited”)? Here is an illustrative example.

Example 1: Seth is single and self-employed. He claims the standard deduction in 2021. He reports a business profit of $100,000 on his Schedule C. He also has $1,000 of interest income.

His Income Limit is computed as follows:

Schedule C Income: $100,000

Interest Income: $1,000

Deduction for ½ Self-Employment Taxes: ($7,065)

Standard Deduction: ($12,550)

Taxable Income: $81,385

20% Limit: $16,277

Seth’s QBI Limit is computed as follows:

Schedule C Income: $100,000

Deduction for ½ Self-Employment Taxes: ($7,065)

QBI: $92,935

20% Limit: $18,587

In this case, Seth’s QBI deduction is only $16,277 (he is Income Limited), the lesser of these two calculated limits. 

Roth Conversion Planning

Is there anything Seth can do to increase his limitation and optimize his QBI deduction?

Imagine Seth has $20,000 in a traditional IRA (with zero basis). He could convert some of that traditional IRA to a Roth IRA by December 31, 2021. This would create taxable income, which would increase Seth’s Income Limit. Here is how that could play out:

Without Roth Conversion

Schedule C Income	$ 100,000
Interest Income	$ 1,000
Deduction for ½ Self-Employment Taxes	$ (7,065)
Adjusted Gross Income	$ 93,935
Standard Deduction	$ (12,550)
Qualified Business Income Deduction (see above)	$ (16,277)
Taxable Income	$ 65,108
Federal Income Tax	$ 10,072

With Roth Conversion

Schedule C Income	$ 100,000
Interest Income	$ 1,000
Deduction for ½ Self-Employment Taxes	$ (7,065)
Roth IRA Conversion	$ 11,550
Adjusted Gross Income	$ 105,485
Standard Deduction	$ (12,550)
Qualified Business Income Deduction	$ (18,587)
Taxable Income	$ 74,348
Federal Income Tax	$ 12,105

What has the $11,550 Roth IRA conversion done? First, it has made the Income Limit ($18,587) the exact same as the QBI Limit ($18,587). Thus, Seth’s QBI deduction increases from $16,227 to $18,587. 

Second, notice that Seth’s taxable income has increased, but not by $11,550! Usually one would expect that a Roth IRA conversion with no basis recovery would simply increase taxable income by the amount converted. But not here! The interaction with the QBI deduction caused Seth’s taxable income to increase only $9,240 ($74,348 minus $65,108). 

This example illustrates that, under the right circumstances, a Roth IRA conversion can receive the benefit of the QBI deduction!

As a result, at Seth’s 22 percent marginal federal income tax bracket, his total federal income tax increased only $2,033. In effect, Seth pays only a 17.6 percent rate on his Roth IRA conversion ($2,033 of federal income tax on a $11,550 Roth IRA conversion). This is true even though Seth is in the 22 percent marginal tax bracket. His Roth IRA conversion is only 80 percent taxable. This is the flip-side of the 80% deduction phenomenon I previously blogged about here. 

Is it advantageous for Seth to convert his traditional IRA? Well, it depends on Seth’s expected future tax rates. If Seth’s future marginal tax bracket is anticipated to be 22 percent, then absolutely. Why not convert at a 17.6 percent instead of face a 22 percent rate on future traditional IRA withdrawals?

Strategy

Seth’s Roth IRA conversion is optimized. The takeaway is that the Roth IRA conversion gets the benefit of the QBI deduction, but only for amounts that increase the Income Limit up to the QBI Limit.

A *very general* rule of thumb for solving for the optimal Roth conversion amount is to multiply the difference between the QBI Limit and the Income Limit (without a Roth conversion) by 5. In Seth’s case, that was $18,587 minus $16,277 (which equals $2,310) times 5.

In this case, converting exactly $11,550 made Seth’s Income Limit exactly equal his QBI Limit. As long as the Roth conversion increases the Income Limit toward the QBI Limit, the conversion benefits from the QBI deduction.

But the first dollar of the Roth conversion that pushes the Income Limit above the QBI Limit does not receive the benefit. If Seth converted $11,551 from his traditional IRA to his Roth IRA, that last dollar above $11,550 would be taxed at Seth’s full 22 percent federal marginal tax bracket. 

Note that instead of / in addition to a Roth IRA conversion, Seth could do an in-plan traditional 401(k) to Roth 401(k) conversion, if he had sufficient funds in a traditional 401(k), and the 401(k) plan permits Roth 401(k) conversions.

Also note that the strategic considerations with QBI deductions become much more complicated once taxpayers exceed the initial QBI taxable income limitations (in 2021, those are $164,900 for single taxpayers and $329,800 for married filing joint taxpayers). 

Conclusion

Taxpayers whose taxable income consists mostly or exclusively of self-employment income should consider Roth conversions toward year-end. This is often an area that benefits from consulting with a professional tax advisor before taking action.

Further Reading

I have blogged about the QBI deduction and retirement plans here. After the IRS and Treasury provided some QBI deduction regulations in January 2019, I provided some QBI deduction examples and lessons here. 

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This post is for entertainment and educational purposes only. It does not constitute accounting, financial, legal, or tax advice. Please consult with your advisor(s) regarding your personal accounting, financial, legal, and tax matters. Please also refer to the Disclaimer & Warning section found here.