Schedule C Deductions for Online Shoppers: The Complete 2026 Guide

Schedule C is the IRS form that sole proprietors, freelancers, gig workers, and single member LLCs use to report business income and expenses. Every legitimate dollar you put on Schedule C reduces the income that gets taxed at your federal rate, and it also reduces the income that gets taxed at the 15.3 percent self-employment rate, so deductions are roughly twice as valuable to a self-employed person as they are to a W-2 employee.

Most self-employed people now buy a real share of their business supplies from Amazon, Walmart, Best Buy, Home Depot, Temu, and delivery apps. The trouble is that a bank line like AMAZON MKTPL doesn't say what was bought, so a lot of legitimate purchases never make it onto the return.

This guide walks through the Schedule C lines that matter most for online shoppers, the IRS rules for mixed-use purchases, what documentation actually holds up, and what to expect from each major platform you buy from. The goal is to give you a single reference you can come back to every quarter and every tax season.

1. Schedule C Explained for Non-Accountants

Schedule C is officially titled Profit or Loss From Business (Sole Proprietorship). It attaches to your personal Form 1040 and reports the income and expenses of any unincorporated business you run. If you receive a 1099-NEC, drive for Uber, sell on Etsy, freelance on the side, or run a single member LLC that has not elected corporate taxation, you file Schedule C.

The bottom line of Schedule C is your net profit, and that net profit flows into two different tax calculations. First, it is added to your regular taxable income, where it is taxed at your federal bracket (10, 12, 22, 24, 32, 35, or 37 percent in 2026), plus state income tax if applicable. Second, it is taxed at the self-employment rate of 15.3 percent, which covers Social Security and Medicare. The combined marginal rate on a self-employed dollar typically lands somewhere between 22 and 40 percent.

That is why every legitimate deduction matters: each dollar you can prove lowers both your income tax and your self-employment tax.

2. The Schedule C Lines That Matter Most for Online Shoppers

Schedule C Part II is a list of expense categories. Most online purchases land in one of eight specific lines. Knowing which line each type of purchase belongs on is the difference between a clean return and a return that gets pushed back by your accountant or, in a worse case, questioned by the IRS.

3. The Mixed-Use Problem (and How the IRS Wants You to Handle It)

Most online purchases by self-employed people are partly business and partly personal. The Amazon Prime membership covers personal Sunday shopping and the boxes you ship to clients. The phone plan rings for your mom and your customers. The home internet runs the family Netflix and the Zoom calls.

The IRS rule is straightforward: only the business-use percentage is deductible, and you must use a reasonable, consistent method to calculate that percentage. There is no required formula, but there is a required logic. You should be able to explain how you arrived at the number.

Three common worked examples:

• Laptop used 70 percent for work, 30 percent personal: a $2,000 MacBook gives a $1,400 deductible amount. If it is over the $2,500 capitalization threshold, the same 70 percent applies to depreciation or Section 179.
• Phone plan split between business and personal: a $90 a month plan used 60 percent for business gives $54 a month, or $648 a year, deductible. A simple way to estimate the split is to look at one representative month of call and data history.
• Home internet bill: a $75 a month plan in a home where the dedicated office occupies 12 percent of the square footage gives a $9 a month deduction, or $108 a year. If the internet supports business use beyond the office itself, a higher, usage-based percentage may be defensible.

The percentage you choose should be the same percentage your records would show if the IRS asked. Picking 80 percent because it sounds reasonable, when an honest count would be closer to 40, is the single most common cause of a denied mixed-use deduction.

4. What the IRS Actually Requires for Documentation

IRS Publication 463 and Publication 535 set out the documentation standard for business expenses. For each deductible purchase you should be able to show five things: the date, the vendor, the amount, the item or service, and the business purpose. Anything less and the deduction is at risk.

The records have to be contemporaneous, meaning they were created at the time of the purchase or close to it. A receipt saved the day you bought the item is contemporaneous. A spreadsheet you rebuild from memory in March of the following year is not, even if the numbers are accurate. The contemporaneous standard is what separates a record the IRS will accept from a story the IRS will discount.

A bank or credit card statement on its own is not sufficient documentation. A line that reads AMAZON MKTPL $84.21 tells the IRS that money left your account, but it does not show what was purchased. The order confirmation, the email receipt, or the item-level export is what proves the deduction. The bank statement is supporting evidence that the payment cleared.

For online purchases the practical setup is: keep the order confirmation email, capture the item-level detail (vendor, date, amount, item description), and write a short note on the business purpose for any purchase that is not obvious from the item itself. The note can live on the receipt, in a spreadsheet column, or in a tag on a categorization tool. What matters is that it exists at the time of the purchase and survives until you file.

5. The Platforms Self-Employed People Use Most

Different platforms drive different categories of deductions. Here is what each one typically yields for self-employed shoppers and resellers, and which Schedule C lines those purchases tend to land on.

Amazon

The dominant source of deductible online purchases for most self-employed people. Amazon purchases for businesses fall almost entirely into Line 18 (office supplies, software, small electronics under the capitalization threshold) and Line 22 (shipping supplies, materials used in the work). Resellers also use Amazon to source inventory, which is treated as cost of goods sold rather than ordinary expenses. Item-level Amazon export is the cleanest way to separate business from personal purchases at scale.

Walmart

Heavy in everyday business consumables: cleaning supplies for a rental property, packing materials for a small ecommerce operation, basic office furniture, breakroom supplies for a one-person studio that hosts clients. Most Walmart business purchases land on Line 18 or Line 22. The challenge with Walmart is that personal grocery and household runs sit in the same order history as business purchases, so item-level review is essential.

Best Buy

The go-to for business electronics. Monitors, docking stations, cables, drives, and printers under $2,500 belong on Line 18. Items over $2,500 (high-end laptops, professional cameras, large displays) go on Line 13 with depreciation or Section 179. Best Buy receipts are also where warranty and Geek Squad service plans show up, both of which are deductible on the same line as the equipment.

Home Depot and Lowe's

The deduction engines for trades, contractors, real estate investors, and anyone with a home office. Tools and small equipment under the capitalization threshold go on Line 18 or Line 22 depending on whether they support the office or the work itself. Materials used on jobs (lumber, paint, hardware, fixtures) go on Line 22. Major equipment over $2,500 lands on Line 13. Home office improvements may flow into the home office calculation on Line 30.

Temu and AliExpress

Heavily used by resellers, dropshippers, and crafters sourcing low cost inventory. Inventory purchases are not Schedule C expenses in the same way office supplies are. They flow through cost of goods sold (Lines 35 to 42), so the deduction recognizes only when the inventory is sold. Non-inventory business purchases (packaging supplies, small tools, business decor) go on Line 18 or Line 22. Both platforms make item-level export important because order data is fragmented.

Uber and Lyft

Two situations to keep separate. As a driver, the platform fees, car expenses, and supplies are reported on Schedule C with the standard mileage method or the actual expense method. As a rider, business trips for client meetings or work travel are deductible on Line 24a (travel) or as part of business meal travel. Personal rides are not deductible. The same Uber account often has both, so monthly receipts have to be filtered.

Instacart and Grocery Delivery

Largely personal, but with real business pockets: food and beverages provided to staff or clients on site (Line 24b at 50 percent), office breakroom supplies for a home office that meets clients (Line 18), and any consumable supplies used directly in the business. As an Instacart shopper, the dynamic flips and the earnings are reported on Schedule C with the same mileage and supply deductions available to other gig drivers.

DoorDash and Uber Eats

The most common Line 24b source. Business meals delivered to client meetings, working sessions with collaborators, or eaten during business travel are 50 percent deductible. Solo meals at your desk are not, no matter how late the work runs. As a delivery driver, the income side flows to Schedule C and the same vehicle and supply deductions apply.

6. Five Common Mistakes That Get Schedule C Deductions Rejected

1. Relying on bank statements alone. A statement line for an online retailer does not document what was bought. Without the order detail, the deduction is unsupported, and a careful accountant will not include it on the return.
2. Claiming 100 percent of a clearly mixed-use purchase. Deducting the entire phone bill, the entire internet bill, or the entire laptop when the items have any meaningful personal use is a classic trigger for adjustment in an audit.
3. Putting inventory on Line 22 instead of cost of goods sold. For resellers and product businesses, inventory has to flow through Lines 35 to 42 and the deduction recognizes only when the inventory is sold. Treating sourced inventory as ordinary supplies overstates the current-year deduction.
4. Capitalizing nothing and expensing equipment over $2,500. The de minimis safe harbor lets most small businesses expense items up to $2,500 per invoice, but bigger purchases need to be capitalized or run through Section 179 on Line 13. Putting a $4,000 camera on Line 18 is a structural error.
5. Missing the contemporaneous standard. Rebuilding an entire year of receipts from memory and bank statements in March is not contemporaneous, and the IRS gives those records less weight than a clean trail captured at the time of purchase.

7. How to Estimate Deductions Before You Have Exact Records

Quarterly estimated taxes are due on April 15, June 15, September 15, and January 15. You usually have to pay them before your year-end records are clean, which is why a defensible estimate matters.

A workable two-step method:

1. Pull total spend by retailer for the quarter. Bank statements and credit card exports show total dollars at Amazon, Walmart, Best Buy, Home Depot, and the rest. This is not documentation, but it is a starting number.
2. Apply a realistic business-use percentage by retailer. Most self-employed shoppers know that, say, 60 percent of their Amazon spend is business and 20 percent of their Walmart spend is. Multiply the totals by those percentages, sum them, and you have a defensible estimate of deductible online purchases for the quarter.

Use that figure to size your quarterly estimated payment, then tighten the number with item-level records before you file the annual return. The estimate keeps the IRS off your back during the year. The exact records keep your accountant happy in March.