Updated November 8, 2026. Quick answer: An interior designer’s deductions are travel to clients and showrooms, samples and supplies, software, a home office and insurance. Two issues are specific to the work: money you spend for a client and get reimbursed for is handled separately from your own expenses, and the exception that lets some home businesses store inventory without exclusive use is written for retail and wholesale, not services.
The deductions this work usually has to sort out
This page reads the IRS documents linked under Sources, as retrieved on November 8, 2026. The IRS publications and instructions cited here are the 2025 editions, written for returns filed for 2025; check the current edition before relying on a figure.
Every deduction below has to pass one test first. Publication 334 puts it this way: “To be deductible, a business expense must be both ordinary and necessary.” “An ordinary expense is one that is common and accepted in your field of business.” “A necessary expense is one that is helpful and appropriate for your business.” And where a cost is mixed: “If you have an expense that is partly for business and partly personal, separate the personal part from the business part.”
This table is the usual set for a solo interior designer. The line shows where the Schedule C instructions place that kind of cost; whether a particular purchase qualifies is the ordinary-and-necessary question above.
| Cost | Schedule C line | What to keep | Where it is explained |
|---|---|---|---|
| Driving to clients and showrooms | Line 9 | Mileage log | mileage log requirements |
| Fabric, paint and material samples | Line 22 | Receipts | Schedule C lines 20 to 22 |
| Design software (subscription) | Line 18 or Part V | Subscription invoices | Schedule C lines 17 to 19 |
| Computer, printer, large-format equipment | Line 13 or Part V | Invoice with the date and price | equipment and depreciation records |
| Out-of-town client or trade-show travel | Line 24a | Receipts; trip dates, place and purpose | Schedule C lines 24a and 24b |
| Meals on trips | Line 24b | Receipts; who, where, why | business meals records |
| Contract help (drafters, installers) | Line 11 | Invoices and each payee’s Form W-9 | Schedule C lines 10 and 11 |
| Liability insurance | Line 15 | Policy declarations | Schedule C lines 14 and 15 |
| Advertising and portfolio costs | Line 8 | Invoices | Schedule C lines 8 and 9 |
Money spent for a client
When you buy for a client and the client reimburses you, the money passes through your books differently from your own expenses. The live page on reimbursed client expenses on Schedule C explains how those amounts are reported, and the records on it determine whether the reimbursement is income, an offset or neither. A client’s check for design services also arrives on a date that matters: Publication 334’s example reads “On December 30, 2024, a client sent you a check for interior decorating services you provided. You received the check on January 4, 2025. You must include the amount of the check in income for 2025.” That example is a cash-method one and shows why the deposit date, not the invoice date, decides the year for a cash-method business.
Samples, storage and the home office
Publication 334’s exceptions to the exclusive-use test include “For the storage of inventory or product samples (for businesses in retail or wholesale trade with no other fixed location).” That exception is written for retail and wholesale businesses. A design business that sells services should not assume it applies to a room full of samples; the safer reading is that the exclusive-use rule applies: “You don’t meet the requirements of the exclusive use test if you use the area in question both for business and for personal purposes.” A showroom corner in a home, used only for the business, can qualify. Records are on home office records for Form 8829.
Equipment and samples under the safe harbor
A computer, printer or sample library purchased as tangible property can be expensed in one year if it falls under the small-purchase election: “If you don’t have an applicable financial statement, you may use the de minimis safe harbor to deduct amounts paid for tangible property up to $2,500 per item or invoice.” Keep the invoice; the election is explained on the de minimis safe harbor and receipts.
Showrooms and local drives
Publication 334 lists “Visiting clients or customers.” as local business transportation, and its commuting rule is “You can’t deduct the costs of driving your car or truck between your home and your main or regular workplace.” A designer who drives to a client site or a showroom is on a client visit; the commute to a regular studio is not. Log date, miles and purpose.
The big items outside the line-by-line list
| Big item | How it comes up for this work | Live pages |
|---|---|---|
| Home office | See the previous section; the exclusive-use rule decides it. | home office records for Form 8829; Schedule C line 30 |
| Vehicle | Client and showroom driving is where the mileage log earns its keep. | mileage log requirements; Schedule C lines 8 and 9 |
| Health insurance | Your own premiums are a Schedule 1 deduction, not a Schedule C cost. “Do not include on line 14 any contributions you made on your behalf as a self-employed person to an accident and health plan.” The same instructions point you to Schedule 1: “you may be able to deduct on Schedule 1 (Form 1040), line 17, the amount you paid for health insurance on behalf of yourself, your spouse, and dependents, even if you do not itemize your deductions.” | Schedule 1 line 17 |
| Retirement plan for yourself | “If you are a sole proprietor, you can deduct contributions you make to the plan for yourself on line 16 of Schedule 1 (Form 1040).” Plan contributions for employees go on Schedule C line 19, which is why the retirement row sits outside the Schedule C table. | Schedule 1 lines 15 and 16; SEP-IRA contributions |
| Qualified business income | Whether interior design qualifies for the QBI deduction at higher income depends on thresholds that change yearly; read the live page for the current numbers. | QBI deduction thresholds for 2026 |
Records
Publication 463 sets the bar: “You must generally have documentary evidence such as receipts, canceled checks, or bills, to support your expenses.”
For capture of sample, supply and trip receipts, SparkReceipt’s home page says you can snap a receipt at the counter in the phone app; Dext’s US home page says you can send receipts, invoices and statements by mobile, email, WhatsApp or desktop. These are the vendors’ statements; this page has not used either product. A folder of photographed receipts and a spreadsheet meet the same IRS test, which is whether the record exists and was made close to the time.
Common mistakes
- Treating a client reimbursement as your own income, or your own expense as the client’s, without the reimbursement records.
- Deducting a room of samples under an exception written for retail and wholesale trades.
- Recording income by invoice date when the check arrived in January.
Related: tax deductions by profession, Schedule C business code for interior designers, and reimbursed client expenses on Schedule C.
Sources
- IRS Publication 334 (2025), Tax Guide for Small Business (For Individuals Who Use Schedule C)
- IRS Publication 463 (2025), Travel, Gift, and Car Expenses
- Instructions for Schedule C (Form 1040) (2025)
Read from the IRS documents linked above on November 8, 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.