Updated October 30, 2026. Quick answer: The 2025 chart lists 541400 for specialized design services, and its wording names interior design in brackets. The code goes on line B beside your line A description. Neighbors such as 541310 and 449120 may read closer depending on the principal source of your receipts.
On deductions by profession: tax deductions for interior designers.
Where interior design appears on the chart
Interior design is named inside a broader design row rather than on a line of its own.
| Code | Wording on the IRS chart |
|---|---|
| 541400 | Specialized design services (including interior, industrial, graphic, & fashion design) |
The full wording is “Specialized design services (including interior, industrial, graphic, & fashion design)”. The word interior is the first of four design fields in the brackets, so a business that does interior work reads this row and sees its field named.
Putting the work into words on line A
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.
An example of the kind of description, not IRS wording: planning room layouts, colors and furnishings for homeowners and small offices. The description can be that specific, and line B still carries just one code from the chart.
Neighbors that read differently
Design work sits close to building, drawing and furnishing rows on the chart. Each is worded around a different activity.
| Code | Wording on the IRS chart |
|---|---|
| 541310 | Architectural services |
| 541340 | Drafting services |
| 449120 | Home furnishings retailers |
| 449110 | Furniture retailers |
| 423200 | Furniture & home furnishing |
A business centered on building plans would read “Architectural services”, and one centered on drawings would read “Drafting services”. If most receipts come from selling goods, “Home furnishings retailers” and “Furniture retailers” are retail rows, while “Furniture & home furnishing” is a wholesale row.
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”.
A design fee, a furniture sale, or both
Some designers bill for their time and also resell furniture and decor to clients. The chart does not say which of those is the principal source. Its second step asks the owner to look at the receipts: “Then select the activity that best identifies the principal source of your sales or receipts”.
The chart has no row that uses the word designer. It names the field instead, so interior design is found by the field word in “Specialized design services (including interior, industrial, graphic, & fashion design)”. If a design practice and a store are two separate businesses, the instructions say: “If you owned more than one business, complete a separate Schedule C for each business.”
Where to go next
The code sits on line B next to the line A description on Schedule C (Form 1040). A designer who works from a spare room can read about the home office deduction, and the owner of a client-facing studio can see Schedule C lines 20 to 22. the full list of Schedule C business codes shows every row at once.
Edition and chart year
This page reads the 2025 Schedule C (Form 1040) and its 2025 instructions, 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
- Searching for a row called interior designer. The chart has no such row; the wording is “Specialized design services (including interior, industrial, graphic, & fashion design)”.
- Treating a furniture retail row as the design row. Those rows read “Furniture retailers” and “Home furnishings retailers”.
- Using two codes for one business. The rule is “Then select the activity that best identifies the principal source of your sales or receipts” so one activity leads on line B.
Related: Schedule C (Form 1040), Schedule C business codes: the full IRS list, the home office deduction, and Schedule C lines 20 to 22.
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Answer againSources
- Instructions for Schedule C (Form 1040), Profit or Loss From Business (2025): IRS archived PDF (irs.gov)
- Schedule C (Form 1040), Profit or Loss From Business (2025): IRS archived PDF (irs.gov)
Read from the IRS documents linked above on October 30, 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.