Schedule C: What It Is, Who Files It, and How to Do It Right

A Schedule C is a form you attach to your personal tax return to report the profit/loss from your sole proprietorship/single-member LLC and is a part of Form 1040. If the business has a profit, then tax will apply here. If you lose money, you can apply that loss to other taxable income you have

Most people discover Schedule C because their accountant mentions it or issues them a 1099. You should understand Schedule C before you file.

Schedule C is how the IRS determines whether or not your side hustle is profitable. Schedule C will affect your self-employment tax, your taxable income, and your eligibility for certain deductions. Schedule C will also determine your eligibility for the QBI deduction, which falls under Section 199A.

Who Has to File Schedule C

You will need to file Schedule C if you are a sole proprietor, are a member of a single-member LLC that has not elected to have the LLC taxed as a corporation, or are an independent contractor who has business income. This also includes freelancers and gig workers who receive a 1099-NEC during the year.

Schedule C also does not apply if your single-member LLC has filed Form 8832 to elect to be taxed as a C-corporation or has filed Form 2553 to elect to be taxed as an S-corporation. These LLCs will also file corporate tax returns (Form 1120 or 1120-S). However, the default tax classification of a single-member LLC is a disregarded entity, meaning that the income will flow through and be reported on your Form 1040 via Schedule C.

LLCs and Partnerships

Schedule C does not apply to partnerships and multi-member LLCs, as they require Form 1065. Each partner receives a K-1 and files it with their personal return.

What Schedule C Actually Captures

To complete Schedule C, gross receipts are reported, and then business expenses are deducted to determine a net profit (or loss). This amount is transferred to Form 1040 as part of the total adjusted gross income.

There are several other deductions listed on the form, such as advertising, car and truck expenses, depreciation, insurance, office expenses, rent, utilities, and wages. If you sell a physical product, there is a Part II for the cost of goods sold, and a Part IV for expenses related to vehicles and mileage.

One of the most commonly missed deductions is the portion of the home used for business (if there is a home office). This is calculated on Form 8829 and filed with the return. This is a legitimate deduction, and the IRS takes home office claims seriously, so in order to take the deduction, the home office must be used exclusively and regularly for business.

Schedule C and Self-Employment Tax

This is the part of the filing that surprises most first-time filers. When you are an employee, the employer shares the liability for Social Security and Medicare taxes. As a self-employed individual, you bear the liability for the self-employment tax, which is calculated on Schedule SE.

In 2024, 15.3% of net earnings up to $168,600 (the Social Security wage base) is subject to self-employment tax, while 2.9% is levied on income exceeding that amount. Fortunately, to some extent, this number is reduced because 50% of the self-employment tax is deductible on the 1040, but the number is admittedly high and comes as a shock to most.

If the IRS expects you to owe more than $1,000 in taxes, you must make estimated payments on a quarterly basis using Form 1040-ES. Failure to make these payments does not result in an immediate penalty notice, but underpayment penalties may be incurred when the annual tax return is filed.

Common Mistakes on Schedule C

Combining personal and business expenses is, by far, the most common Schedule C problem, and having no separate business bank account is usually the main reason. If you pay for a mixed-use item, you can only claim a deduction for the business portion. If you paid your phone bill in full but use the phone for personal use, you will likely have your return flagged.

You have to keep a mileage log because the IRS standard mileage rate for 2024 is 67 cents per mile. If you drive a lot for business, costs can add up pretty quickly, but you need a contemporaneous log. Most likely, auditors will see the difference if you try to figure out how much mileage you had for business use when you file your return.

Incorrectly Reporting Hobby Income. According to IRC Section 183, the IRS can label your activity a hobby if there is no profit in 3 of the 5 years. You cannot use hobby losses to offset any income, and consistently negative income means you should consult your accountant about hobby losses before you file.

Not Claiming Depreciation. Long-term assets do not get fully expensed in the year of purchase unless you elect Section 179 or bonus depreciation. It is a common misconception that Section 179 applies to perpetual assets, and some people even forgo the deduction entirely.

Filing with the Wrong Business Name or EIN. As a single-member LLC, when you apply for an EIN, your business will be recognized as a separate entity. Business earnings should be listed under your EIN. Although you can provide your SSN instead of your EIN, it should be avoided. It may create unnecessary delays in processing and could raise some questions.

Schedule C Filing Deadlines and Costs

Schedule C and other forms, such as your 1040, will all have the same filing deadline of April 15. If you file a tax extension with Form 4868, you have until October 15. Note that this extension is only for the filing, not for payment, as any taxes owed must be paid on April 15.

There is no separate cost to file Schedule C, as it is part of the individual tax return. However, the cost of filing Schedule C with a tax preparer ranges from $150 to $400. Schedule C also becomes more expensive with complex returns that include the depreciation schedule, home office deductions, and the cost of goods sold (COGS).

Self-preparing taxes using tax preparation software (like TurboTax and H&R Block) is included in the self-employed tier, which costs between $90 and $130 in 2025. The IRS also has a Free File program for individuals with an Adjusted Gross Income (AGI) of $79,000 or less.

Schedule C vs. Schedule E: Which One Applies

Schedule C is not used to report rental income, which is reported on Schedule E. Schedule E also includes K-1 income, such as partnership and S corporation income.

This separation is important because income reported through Schedule C is also subject to self-employment tax, whereas income reported through Schedule E is not. Some real estate investors try to claim Schedule C income by aggressively using business deductions, but the IRS has specific guidelines for what qualifies as a business activity versus a rental activity. Failing to follow those guidelines can result in an unnecessary self-employment tax bill.

FAQ

Does a single-member LLC always file Schedule C?

A single-member LLC is considered a disregarded entity by the IRS. Income and expenses are reported on the owner’s Form 1040 through Schedule C. By default, single-member LLCs complete Schedule C. LLCs electing to be taxed as S-corporations or C-corporations complete a business tax return instead.

Can I file Schedule C if I have no income but have had expenses?

Yes, claiming a business loss on Schedule C is worth it. A business loss is an offset to income and may reduce tax liability. The IRS allows losses to be claimed for a period of time; after that, the loss will be considered a hobby loss, and tax benefits will not be allowed.

Do I need an EIN to file Schedule C?

No, a sole proprietor does not need an EIN to file a Schedule C. The owner may use their Social Security number. Consistency is key, so if the single-member LLC has an EIN, use it.

What is the Schedule C safe harbor for meals?

Business meals are a tax-deductible expense at 50% of the cost. The IRS requires record-keeping to document the meal and who was present. No records equal no deduction.

What triggers a Schedule C audit?

High vehicle expenses, a home office deduction, losses for multiple tax years, and disproportionately large business expenses relative to business income are common triggers. The IRS compares filed 1099s with reported income on Schedule C to verify income.

Can non-U.S. residents file Schedule C?

Non-resident aliens conducting business in the U.S. and having connected income must file Form 1040-NR, which has a Schedule C equivalent. The rules for non-residents are likely to be more complicated, especially regarding tax treaties, and differ from those for residents.

If you have a U.S. LLC or sole proprietorship and want to understand how your business structure impacts tax obligations, we can assist you. At EasyFiling, we work with founders in over 175 countries on LLC formation, EIN, and compliance services.