Section 199A Business Deduction

The Support programs provided a dialog to enter a party’s net income from sole proprietorships, partnerships or s-corporations. The entries in this dialog are needed in order to accurately calculate the potential Section 199A business income deduction that can applied to reduce the business owner's federal taxes. As the business deduction can be taken from the income of multiple business entities and then combined, the dialog provides entries for the income of up to 4 businesses. Additionally, income from a real estate investment trust (REIT) can also be used as a Section 199A business deduction.

Before any income phase-outs, the business income deduction is 20% of the business owner's Qualified Business Income (QBI) or 20% of the business owner's Taxable Income, whichever is less. Taxable Income, for example, would be the business owner's Total Income minus the federal standard deduction, minus (1/2 of any SE tax) and minus any tax-free income like the portion of tips received by the business owner that may be tax-free.

When an individual’s Taxable Income exceeds certain inflation adjusted thresholds, then the business deduction can be reduced. The Taxable Income thresholds for 2026 are $201,750 for a single, head of household or married separate filers, but double that to $403,500 for an individual filing married jointly. If the business owner’s Taxable Income does not exceed these thresholds, then there is no limitation or phase-out of the Business Deduction.

In this dialog, you will need to check whether or not the business is a specified service trade. This is important as the phase-out of the business deduction is applied differently and can occur much quicker if the business can be characterized as a specified service trade. A "specified service trade" would include businesses involving the performance of services in the fields of health, law, consulting, athletics, financial or brokerage services, accounting, or commodity or security trading. It would not include though engineering or architectural services. As long the business owner's Taxable Income does not exceed the income phase-out thresholds, then there is no difference in the Business Deduction whether the business is a Specified Service Trade or not.

Business A or Business B on this dialog would be for income from a sole proprietorship or from a partnership where the individual’s income would be subject to the payment of self-employment taxes by the individual.

For an individual’s income from a sole proprietorship or partnership (Business A or B), there are two entry boxes. One entry box is for business income that would qualify for the business deduction and another entry box for income that would not qualify. We believe that most all net income taken by a sole proprietor or by a partner in a partnership should be available for the business deduction. An additional data entry box is provided for a sole proprietor’s or partner’s income from that business that may not otherwise qualify for the deduction but where the individual is still paying self employment taxes on that income.

Business C or Business D would be for an individual’s income taken from a s-corporation where the income is either W-2 wages subject to FICA paid at the corporate level or pass-thru income not considered wages or subject to payroll tax. Only the pass-thru income taken would be available for the business deduction, but the calculation needs to know the owner’s W-2 wages paid by the s-corporation to accurately determine any potential phase-out of the business deduction once the business owner's taxable income exceeds the inflation-adjusted income thresholds.

If a business owner's taxable income exceeds the phase-out limits, that amount of the business deduction can be dependent on the W-2 wages paid to employees of the business (and to the owner or a s-corporation) and also dependent on the original cost to the owner of business capital assets not yet fully depreciated. The dialog provides for two entry boxes for those amounts. These boxes are provided for both the sole proprietorships and partnership businesses (Business A an B) and for S-Corporations (Business C or Business D). If you are using a version of the program that provides for a tax calculation of a married filing jointly party, then this dialog will also show additional data entries to account for the businesses owned by the spouse. Note that for a partner where there are multiple partners or for a s-corporation with multiple owners this will only be the allocable share, to the individual owner or partner, of those employee wages or assets and not necessarily the full amount incurred by the business.

If a business owner's taxable income does not exceed the inflation adjusted income thresholds, then these additional data entries for employee wages and capital assets are not relevant.

This dialog also includes entry boxes for any tips received by the business owner in the course of the business activity. The maximum amount of tips that can used as federal tax-free income is $25K unless Total Income (without adjustments) exceeds $150,000 (Single, HH) or $300,000 (MFJ). Then the maximum amount of tips that can be used as tax-free income is $100 less for every $1000 that Total Income exceeds the phase-out threshold.

Once a business owner's Taxable Income exceeds the income thresholds, three initial calculations need to be made and the individual amounts compared to each other to determine the potential phase-out of the Business Deduction. At this point in the initial calculation, it does not matter whether or not the business is characterized as a Specified Service Trade or not.

The three amounts that need to be calculated are as follows:

1) 20% of the Qualified Business Income (QBI): QBI constitutes the reasonable compensation to the business owner that was entered in the dialog.

2) 50% of the W-2 Wages Paid: This can be W-2 wages paid to the owner of an S-Corp, or W-2 wages paid to an employee of the business (for any type of business entity). It does not appear to include the business income taken by a sole proprietor or partner which instead would be characterized as income subject to self-employment tax and not by the IRS as W-2 wages. For a partnership, it would include the allocable share of W-2 wages paid to employees. In other words, for a 50/50 partnership, each partner would be able to allocate 50% of the employee W-2 wage paid for purposes of the Business Deduction. It all depends on the partnership agreement. Same goes for an S-Corp as it would likely depend on the ownership agreement. But for an S-Corp, the business owner would certainly add his own W-2 wages received along with any allocable share of W-2 wages paid to employees. For an S-Corp, the owner’s individual W-2 wages would not be included in the QBI that is passed thru to the owner. For a sole proprietorship, this would include all of the W-2 wages paid to employees but not to independent contractors performing services for which no W-2 wages were reported to the IRS by the business.

3) 25% of W-2 Wages Paid plus 2.5% of percent of the unadjusted basis, immediately after acquisition, of all qualified property: OK, perhaps time to talk to your tax accountant. But again for an S-Corp or Partnership, this would be the partner’s or owner’s allocable share of the cost of all accumulated depreciable capital assets. For a sole proprietorship, it would simply be the sole business owner’s original cost of all acquired capital assets for that business that have not yet been fully depreciated.

Once these three items listed above are determined, then take the greater of 2) or 3) above, and then compare to 1), taking the lesser amount. This lesser amount will be the Lower Limit of the Business Deduction and 1) from above will be the Upper Limit of the Business Deduction.

The phase-out calculation for a business that is not a specified service trade is:

Business Deduction = UpperLimit – (UpperLimit – LowerLimit) X %Factor

Where for the 2026 Tax Filing Year:
UpperLimit = Always 20% of QBI
LowerLimit = Either 1), 2) or 3) from above
%Factor = (Taxable Income – 201,750)/75,000 for a Single filer; or
(Taxable Income – 403,500/150,000) for married filing jointly;

Note that the %Factor will range from 0 to 1 depending on how much the individual’s taxable income exceeds the income threshold. Therefore for a business that is not specified service trade, once a business owner’s Taxable Income fully exceeds the end of the phase-out bracket, the Business Deduction will be the Lower Limit of the Business Deduction as described above.

For a business that is not specified service trade, when a business owner’s Taxable Income falls between the phase-out threshold and the end of the phase-out bracket, the Business Deduction will proportionally fall between these upper and lower Business Deduction limits based on the where the individual’s Taxable Income proportionally falls within the phase-out bracket.

Note that for a business that not a specified service trade, if 20% of QBI is less than either 2) or 3) above), then the Lower and Upper Limits of the Business Deduction will be the same and there will be no phase-out or reduction of the Business Deduction. On the other hand, if that business has no W-2 employee wages to declare or no depreciable assets, then the Lower Limit of the Business Deduction will be zero resulting in a complete phase-out of the Business Deduction once the individual’s Taxable Income exceeds the end of the phase-out bracket ($276,750 for single and $553,500 for married jointly).

Now for a Specified Service Trade business, the Upper and Lower Limits of the Business Deduction are determined as above, but the formula is different. Again for the mathematically inclined, the phase-out calculation would look like this:

BusinessDeduction = UpperLimit X %RFactor - ((UpperLimit X %RFactor) - (LowerLimit X %RFactor)) X (1 - %RFactor)

Where for the 2026 Tax Filing Year:
UpperLimit = Always 20% of QBI
LowerLimit = Either 1), 2) or 3) above
%RFactor = 1 - (TaxableIncome – 201,750)/75,000 for a Single filer; or
1 - (TaxableIncome – 403,500/150,000) for MFJ;

Note that the %RFactor will now range from 1 to 0 depending on how much the individual’s taxable income exceeds the threshold. This is just the reverse as how the %Factor worked above for a business that is not specified service trade.

Therefore for Specified Service Trade Business, the Business Deduction will always be reduced to zero once the individual’s Taxable Income fully exceeds the end of the phase-out bracket. If 20% of QBI is less than either 2) or 3) above), then the Lower Limit and Upper Limit of the Business Deduction will be the same and the Business Deduction will be phased out in the same proportion as the individual’s Taxable Income that exceeds the range of phase out threshold.