Updated October 23, 2026. Quick answer: The 2025 Schedule C chart lists 541600 as “Management, scientific, & technical consulting services”. That six-digit number goes on line B, beside your line A description of the work. Depending on the principal source of your receipts, a neighboring row such as 541510, 541800, or 541990 may read closer to what you do.
The code the chart lists for consulting work
The 2025 chart has one row whose wording uses the word consulting. It is 541600, and the chart words it as “Management, scientific, & technical consulting services”. That is the closest wording on the chart for a self-employed person who sells advice or expertise, though the row is worded by field (management, scientific, technical) and not by job title.
| Code | Wording on the IRS chart |
|---|---|
| 541600 | Management, scientific, & technical consulting services |
How lines A and B ask for it
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 a consultant, an example of the kind of description, not IRS wording, might be a short phrase naming the field you advise on and the type of client you serve. Line A is where that plain description goes, and the six-digit number from the chart goes beside it on line B. The full form is covered on our Schedule C walkthrough.
Neighbors worth reading before you settle on a row
Consulting overlaps with several other rows, and the wording of each shows why. A computer-focused adviser may find the systems row closer; someone whose receipts come from marketing work may find the advertising row closer; a person who runs research projects may look at the research row. The catch-all professional services row sits at the end of the group.
| Code | Wording on the IRS chart |
|---|---|
| 541600 | Management, scientific, & technical consulting services |
| 541510 | Computer systems design & related services |
| 541800 | Advertising, public relations, & related services |
| 541700 | Scientific research & development services |
| 541990 | All other professional, scientific, & technical services |
| 561110 | Office administrative services |
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”.
When one person sells several kinds of help
Many consultants do a little of everything: some advising, some training, some project work. The chart’s rule keys on one thing, “Then select the activity that best identifies the principal source of your sales or receipts”. So the question to ask of your own books is which stream of receipts is largest, and which row’s wording describes that stream. If you really run two separate businesses, the instructions say: “If you owned more than one business, complete a separate Schedule C for each business.”
The chart has no row that names a consultant by title. The word consulting appears only in 541600, so a consultant in a narrower field is reading the chart for the closest field wording, not hunting for a job title.
Where the code goes next
The code sits on line B, directly under the line A description. Once the top of the schedule is done, the income side starts at Schedule C line 1 gross receipts or sales, and the profit side of the form leads into Schedule SE. Consultants who are paid on a Form 1099 can read about 1099-NEC box 1 nonemployee compensation as well.
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
- Reading the chart as a list of job titles. It is a list of activities, and the rule is to find “Then select the activity that best identifies the principal source of your sales or receipts”.
- Using one Schedule C for two unrelated businesses. The instructions say “If you owned more than one business, complete a separate Schedule C for each business.”
- Skipping the narrower rows. The chart also lists “Computer systems design & related services” and “Advertising, public relations, & related services”, so compare their wording before you decide.
Related: Schedule C (Form 1040) explained, Schedule C line 1 gross receipts or sales, Schedule SE (Form 1040), 1099-NEC box 1 nonemployee compensation, and Schedule C business codes: the full IRS list.
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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.