The Last Schedule C Guide You'll Ever Need

Everyone loves a good DIY fail. That is, until it happens to you. If you’re filing your self-employment taxes yourself this year, you’ll need a Schedule C guide you can trust. This article tackles the most common questions and provides a comprehensive roadmap for how to do it yourself.

What is a Schedule C?

Schedule C is a form used to report self-employment income on a personal return.

“Self-employment income” is how we describe all earned income derived from non-W-2 sources. This could be income from your small business, freelance work, or just extra cash earned through a side hustle. It’s usually paired with a Schedule SE (Form 1040), or self-employment tax form.

Schedule C is also where you report your business write-offs. Those are the work-related expenses you incurred during the year, like supplies, software costs, your cell phone bill, and more.

Who needs to fill out Schedule C?

If you would describe yourself as one of the following, you should be using a Schedule C:

• Freelancer

• Gig worker

• Side hustler

• Sole proprietor

• Independent contractor

• Sole owner of an LLC (as long as the LLC hasn’t elected to be taxed as a corporation)

• Business owner with your spouse

In a nutshell, if you earn income that isn’t reported on a W-2, you don’t have a business partner, and your business isn’t incorporated (or treated as a corporation for tax purposes), Schedule C is for you.

Prior to 2019, the IRS offered some sole proprietors with very lean operations a simpler option called Schedule C-EZ. Unfortunately, it’s no longer available.

How many Schedule C forms do you need?

As a general rule, you should use one Schedule C for every business activity you’re involved in. For instance, if you DJ on the weekends and sell custom T-shirts on Etsy, those should be reported separately.

This isn’t just a best practice. The IRS instructions say that if you owned more than one business, you must complete a separate Schedule C for each one. Each business gets its own business code, and keeping them separate also keeps your expense categories in line with what the IRS expects to see for that industry.

The goal is to keep all similar or related activities together. So for example, if you drive for both Uber and Doordash, you could combine those activities on a single Schedule C, since they both fall under the umbrella of driving services.

How to fill out your Schedule C, step by step

The best way to learn is with examples. So for our Schedule C walkthrough we’re going to look at how Bruce Banner — also known as The Hulk — would complete his tax form.

Step #1: Input your information

The first section of the Schedule C is reserved for your business information. We’re going to review this in detail below.

Name of proprietor

This is always your own name, exactly as it appears on your Form 1040, even if you operate through a single-member LLC. Your LLC name or “doing business as” name goes in Box C, not here.

‍Social Security number

Your Social Security number always goes here. This box is never left blank. Box D is for an employer identification number (EIN), and you fill it in only if you have one for your business.

The important thing is that the tax ID number listed here matches any 1099-NECs you receive.

Box A: Principal profession‍

This box describes the industry you work in. In the example above, Bruce Banner’s profession is working as an Avenger.

There’s really no right or wrong here, just pick a word that best describes what you do. That could be “dog walker,” “massage therapist,” or even something general, like “janitorial services.”

Box B: Code‍

This code helps the IRS identify your industry more precisely. The IRS uses a list of predetermined NAICS codes to pick from.

It’s not always easy to determine which code makes the most sense, but your best guess is fine. There’s no penalty for accidentally choosing the wrong thing.

In Dr. Banner’s case, it’s hard to find a code that adequately describes “superhero,” so he went with 812990 - “other personal services.”

Box C: Business name

Leave this blank if you don’t have a separate business name. If you do have one, enter an LLC name or a “doing business as” name here.

This helps the IRS tie records in the event that some of your 1099’s are issued under your personal name, and some under your DBA name.

When working on the team, Mr. Banner goes by Bruce, but his public-facing name is The Hulk, so he listed both to minimize confusion.

Box E: Business address

If you have a separate location for your business, list it here. If not, your personal address will do.

Box F: Accounting method

The majority of taxpayers use the cash method.

The other accounting methods won’t be applicable to most of you, but if you’re like Tony Stark and don’t like being kept in the dark, here’s where you can learn more.

‍Box G: Material participation

For the majority of taxpayers, this will be yes.

You materially participated if you were regularly and actively involved in running the business — for example, you worked in it more than 500 hours during the year, or you did substantially all of the work yourself. (The instructions list seven tests; meeting any one is enough.) If you check “no,” the business is treated as a passive activity, and a loss can only be used against other passive income.

Box I & J: Filing 1099 forms

If you paid a contractor more than $600, you’re required to send them a 1099-NEC (and file a copy with the IRS). For payments made in 2026, that threshold rises to $2,000.

Payments you made by credit card or through a payment app don’t count — the card company or app reports those on a 1099-K instead. Boxes I and J ask whether you had any payments like this, and whether you filed (or will file) the forms.

Note that if you mark “yes” to the first box, and “no” to the second, it’s likely the IRS will follow up, and you could get penalized for every unsent 1099.

Step #2: Fill out your income and cost of goods sold

Part 1 of Schedule C is where you record your total income and the cost of your sales.

Box 1: Gross receipts

Remember all those 1099-NECs and 1099-Ks you’ve been saving? This is where they go. Tally up your income for the year using your 1099s and bank statements and input the total in box one.

If your 1099-NECs add up to more than what you report here, the IRS expects a statement explaining the difference.

Box 2: Returns

This is used to report any returns or refunds you had to give during the year. Typically it’s used by people selling physical products, but any refunds can be put here.

Box 4: Cost of goods sold

Cost of goods sold (COGS) refers to the costs directly related to creating a product. For example, if you sell artwork, your COGS would be things like canvases and paint.

To determine what amount should go on line 4 of the Schedule C, you have to fill out Part III on Page 2.

Line 33 asks you to choose an inventory method. For most taxpayers, this will be “cost.”

Line 34 asks if you’ve made any changes to how you track or value inventory. The answer will be “no” for most people.

How to calculate cost of goods

Traditionally, COGS is calculated using the following formula:

Starting inventory + (purchases + labor +materials) - ending inventory‍

So for example, say you have $300 worth of unsold artwork at the start of the year. During the year, you purchase supplies to make an additional $400 worth of artwork. At the end of the year, you have $500 of unsold artwork. In that case, your cost of goods would be $200. (300 + 400 - 500 = 200)

The idea is to not write off the cost of anything that hasn’t been sold yet.

Box 6: Other income

This is where you can report business income that doesn’t belong on line 1. For example, interest on a business bank account, scrap sales, a prize or award related to your business, a bad debt you wrote off earlier and later collected, or a state fuel-tax refund.

One thing that does not go here: selling business equipment. If you sell the computer you’ve been using (and depreciating or expensing) for your business, that sale is reported on Form 4797, not on Schedule C.

Step #3: Fill out your business expenses

For this next step, we’re going to look in-depth at Dr. Banner’s business expenses on Part II of his Schedule C:

Box 8: Advertising

As you can imagine, it’s not always easy for The Hulk to get good press, so Dr. Banner ran several social media campaigns to improve his public image.

In addition, he hired a firm to make Hulk T-shirts, action figures, and other merchandise. All of those costs are included in Box 8.

Naturally, Dr. Banner had a team of S.H.I.E.L.D’s top bookkeepers keeping track of these expenses for him.

While our bookkeepers don’t carry Vibranium weapons, the Keeper team can help you track your advertising costs during the year directly in our app.

Box 9: Car and truck expenses

Auto expenses are ubiquitous in many industries. Box 9 of the Schedule C is where you record either your actual car expenses or your business mileage deduction.

Regardless of the method you choose, you’ll have to report some additional information about your car.

If you plan to claim depreciation on your vehicle, you’re required to use Form 4562 to disclose your car details.

If you’re not claiming depreciation — either because you’re claiming mileage, your vehicle is leased, or it’s already been fully depreciated — you can use Part IV of the Schedule C to list your car details.

If you have multiple autos, you can attach as many copies of Part IV on Page 2 as you need.

Use line 44 to list your business, commuting, and other miles for the year. You need these numbers under either method. With actual expenses, business miles divided by total miles is the percentage of your car costs you get to deduct, so don’t leave line 44 blank. Lines 45 through 47b (personal use, other vehicles, and whether you have written evidence) also have to be completed under either method.

For your mileage deduction, “written evidence” refers to a mileage log. For actual expenses, your business records will do. (The summary of expenses on the Keeper app is sufficient).

Box 10: Commissions and fees

As a member of S.H.I.E.L.D, Dr. Banner is required to pay a 5% fee on his gross sales for their services.

This commission arrangement is similar to what many hair stylists and estheticians have with the beauty salons that they operate out of. These payments can be listed here.

Box 11: Contract labor

This field is for payments made to workers who perform services for you, but aren’t your employees. If you work as a DJ and hire a friend to help set up your equipment, that's contract labor.

Our friend Dr. Banner regularly contracts mechanics, translators, and local guides for his work. Since he usually pays them more than $600 (the threshold for 2025; it rises to $2,000 for payments made in 2026), he also files 1099-NEC forms for them.

Box 12: Depletion

This box is really only used by one specific sector: those in the oil and gas industry, or anyone mining natural resources. Most taxpayers can skip it.

Box 13: Depreciation

Most major purchases can’t be expensed all at once. Things like machinery, equipment, cars, and so on, must be reported as a fixed asset on Form 4562 and gradually depreciated over their useful lives.

For more on how this works, check out our guide to computer write-offs, which covers depreciation in depth!

The current year depreciation is reported here. ‍‍

Box 14: Employee benefits program

Anyone who has W-2 employees and offers them benefits like health or disability insurance, childcare, or group-term life insurance can report those costs here.

Box 15: Insurance

As you can imagine, when your catchphrase is “SMASH,” liability insurance is a must. Box 15 of the Schedule C is where all non-health insurance premiums are reported.

Box 16a: Interest

Do you have a mortgage for an office building or warehouse? If so, use this for the interest payments that are reported on Form 1098 by your bank at the end of the year.

Box 16b: Interest

This line is for business interest you didn’t get a Form 1098 for, such as the business portion of credit card interest, business loans, and (on 2025 returns) the loan on your business vehicle.

Heads up for 2026 returns: the IRS is splitting this line in two. Line 16b will be only for the business-use portion of vehicle loan interest, and everything else moves to a new line 16c.

Box 17: Legal and professional services

This is used to report payments to attorneys, accountants, and any other advisory service. Note that any attorney you pay more than $600 (for 2025; $2,000 or more for 2026 payments) needs to be issued a 1099-NEC.

Box 18: Office expense

Office expenses cover a wide variety of purchases. The obvious ones are printers, paper products, computers and accessories, software, and office furniture. In general, this is a catch-all account for basic overhead expenses.

There is one important exception – office rent isn’t included here. You’ll report that in Box 20b.

Box 19: Pension and profit sharing

If you have W-2 employees that you provide retirement plan options to, this is where you record those costs, including your employer contributions.

Box 20a: Rent or lease machinery and equipment

Little-known fact: While some of The Hulk’s equipment is provided by S.H.I.E.L.D, much of it is leased from Stark Industries. Costs for renting equipment go here.

Box 20b: Other business property‍

This is where you record office rent or lease costs.

Box 21: Repairs and maintenance

This category can include anything from computer repairs to plumbing fees.

As you’d expect, this is a big category for Dr. Banner, whose sheer size and mode of movement results in regular damages to his equipment.

Box 22: Supplies

Another great catch-all category, supplies can include anything you need to complete a job. Think of it as “cost of goods sold” for service providers.

To give an example, if you work as a manicurist, the nail polish you purchase could be included under supplies. If you side-hustle as a dog walker, this is where you’d report treats or whistles.

Box 23: Taxes and licenses

Use this box to report franchise taxes, property taxes on business assets, and payroll taxes (if you have employees). You can also report any business licenses you were required to pay for to operate in your state.

Sales tax you collected from customers and sent to the state goes here only if you also counted it in your gross receipts on line 1.

Box 24a: Travel

Business-related travel costs such as airfare, hotels, train tickets, and rental cars go here.

Note that Dr. Banner has left this box blank, even though he travels a lot for work during the year.

Why? Because he’s been floating around in space, so he doesn't have a designated “tax home”: a place that he routinely conducts business from. As such, he’s considered a “transient worker” for tax purposes and is explicitly disallowed from claiming travel expenses.

Box 24b: Meals

For a brief, glorious period from 2021 to 2022, taxpayers were allowed to claim 100% of their work-related meal costs. That’s over. Since 2023, business meals are back to 50% deductible, and that’s still the rule for 2025 and 2026 returns.

Box 25: Utilities

Typically, utilities can only be claimed if you own, rent, or lease an office space, since your home office utilities will be reported elsewhere.

Box 26: Wages

If you have employees, this is where you’ll report their wages.

Important note: report gross wages (what you agreed to pay) not take-home pay. The figure should line up with the total wages on your W-3 for the year (minus any employment credits you claimed, like the Work Opportunity Tax Credit). If you only deduct what your employees took home after withholding, you’ll understate your write-off and pay more income tax and self-employment tax than you owe. And don’t include anything you paid yourself; an owner’s draw isn’t a wage.

Box 27a: Other expenses

If you can’t figure out where to record an expense on lines 8-26, line 27 gives you the opportunity to list out alternative categories.

On page 2 of the Schedule C, under Part V, you can write custom expenses and their values. The total will carry to line 27 on page 1.

As you can see above, Dr Banner has some unusual business expenses that don’t fit in any of the other categories.

Because of the unique nature of his superpower, his modified garments are a good example of clothing that is specifically designed for work.‍

Hypnotherapy is normally a personal (medical) expense, which isn’t deductible on Schedule C. Dr. Banner can argue it’s a business expense only because keeping the Hulk under control is a core job requirement; a very fact-specific argument that most of us can’t make.

A similar exception is made for pro athletes, who are allowed to write off the costs of physical therapy and massages. Am I the only one who can’t forget Michael Phelps’s cupping marks?

Step #4: Calculate your net profit

Congratulations — you’re down to the final lap. All that remains is calculating your net profit or loss and factoring in your home office deduction.

Box 29: Tentative profit

Add up all of the expenses in lines 8-27b, and enter the total in Box 28. From there, subtract your total expenses from your gross income on line 7.

Voilà! Your tentative profit.

Box 30: Business use of home

You have two options when writing off your home office: the simplified method and the actual method.
‍
To learn more about each option and how to calculate them, check out our comprehensive home office guide.

If you’re claiming the actual method, you need to complete Form 8829 and attach it to your return.

Dr. Banner has elected the simplified method, so he included his home and office square footage on lines a and b. If he were to take the actual method, he could leave those lines blank.

However, since Dr. Banner spent the last few years in space, he actually doesn’t have a strong case to take the home office deduction.

Claiming the simplified method is the most conservative approach that will raise the least amount of scrutiny from the IRS. That’s a good thing, because nobody wants to be in the room when The Hulk learns he’s being audited.

Box 31: Net profit

‍The very last step is to subtract your home office deduction from your tentative profit to determine your actual net income.

This amount will carry to Schedule 1 of your 1040 and line 2 of Schedule SE to calculate self-employment taxes.

Box 32: Investment risk

This section prompts you to categorize the income as either “at risk” or “not at risk.”

It’s another way of asking, “what do you stand to lose?” In other words, if your business goes under, would you be personally on the hook for paying the outstanding debts?

For most taxpayers, the answer is going to be “all investment is at risk.”

You made it to the end — congratulations!

I hope you feel ready to file on your own.