Updated October 23, 2026. Quick answer: The 2025 Schedule C chart lists 541510 as “Computer systems design & related services”, which is the closest wording for information technology consulting. It goes on line B. Neighboring rows such as 541600 may read closer, depending on what brings in most of your receipts.
The row whose wording is closest
The chart has no row for IT consulting under that name. The row with the closest wording is this one:
| Code | Wording on the IRS chart |
|---|---|
| 541510 | Computer systems design & related services |
Its wording names systems design and related services for computers. A consultant who plans, configures or builds computer systems for clients can compare their work against that wording and decide whether it reads as a match.
Writing line A and line B
Line A asks for a description of the work: “Describe the business or professional activity that provided your principal source of income reported on line 1.” Line B asks for the code: “Enter on line B the six-digit code from the Principal Business or Professional Activity Codes chart” The code goes in the box on line B, beside the description.
For an example of the kind of description, not IRS wording, a line A entry might say technology consulting for small businesses. The words on line A are yours; the number on line B has to be one of the chart’s six-digit codes.
Neighbors that may read closer
IT work gets described in several ways, and the chart spreads it across more than one group. Compare the wording of each of these before settling on one.
| Code | Wording on the IRS chart |
|---|---|
| 541510 | Computer systems design & related services |
| 541600 | Management, scientific, & technical consulting services |
| 518210 | Computing infrastructure providers, data processing, web hosting, & related services |
| 541990 | All other professional, scientific, & technical services |
| 541800 | Advertising, public relations, & related services |
The management and technical consulting row is the one a pure advisory practice might weigh, since its wording names consulting directly. The computing infrastructure row names data processing and web hosting, which is the services side of running systems. The all-other row is a catch-all inside the same professional and technical group.
The chart’s rule has two steps: “Select the category that best describes your primary business activity”, and then “Then select the activity that best identifies the principal source of your sales or receipts”.
Does the chart use the term IT consultant?
It does not. The chart has no row that names information technology, software or programming, and the word consulting appears in exactly one row, 541600. Computers show up by name in three rows, one of them a manufacturing row and one a retail row, so only the systems design row sits in the same line of work as a consultant. Reading that out loud is not a recommendation, only a map of where the words are.
Hours billed versus things sold
Many consultants earn from more than one stream: hourly advice, a monthly support plan, a resale of a product. The chart does not sort those streams for you. Its rule is about the single activity that best identifies where most of your sales or receipts come from. A person who also runs an unrelated business has a separate rule to read: “If you owned more than one business, complete a separate Schedule C for each business.”
Next steps after the code
With a number chosen, it sits on line B beside the line A description. The full form is explained at Schedule C (Form 1040). Consultants who get paid by clients directly often see their income reported on forms covered at the page on 1099-NEC box 1, and a home workspace comes up at the page on line 30.
Edition and chart year
This page reads the 2025 Schedule C (Form 1040) and its 2025 instructions, the current files irs.gov served on 2026-10-23 (byte-identical to the archived copies). They are the files for the tax year 2025 return, filed in 2026. The schedule says “Attach to Form 1040, 1040-SR, 1040-SS, 1040-NR, or 1041”. Check the tax year printed on the schedule you are filling in and use the chart that comes with that year’s instructions, because a different year’s chart can list different codes or reword them.
Common mistakes
- Assuming the chart has a row for technology consulting by name: the closest wording is “Computer systems design & related services”, and consulting is named only in “Management, scientific, & technical consulting services”.
- Writing the code on line A: the instructions say “Enter on line B the six-digit code from the Principal Business or Professional Activity Codes chart”, while line A takes a description.
- Treating every client project as its own code: the chart asks for the activity that “best identifies the principal source of your sales or receipts”.
Related: Schedule C (Form 1040), 1099-NEC box 1, nonemployee compensation, Schedule C line 30, business use of your home, and Schedule C line 1, gross receipts or sales.
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Answer againSources
- Instructions for Schedule C (Form 1040), Profit or Loss From Business (2025): https://www.irs.gov/pub/irs-pdf/i1040sc.pdf
- Schedule C (Form 1040), Profit or Loss From Business (2025): https://www.irs.gov/pub/irs-pdf/f1040sc.pdf
Read from the IRS documents linked above on October 23, 2026. General information, not tax advice. Your own facts decide the outcome, and a preparer, the account provider or the IRS is the right place to confirm anything consequential.