You can deduct ordinary business expenses that reduce your taxable income

As a 1099 contractor, you report income on Schedule C (Form 1040), and you can subtract legitimate business expenses from that income before calculating what you owe in taxes. The IRS calls these ordinary and necessary expenses — meaning they are standard in your line of work and directly tied to earning that income. You do not need receipts to list them, but you must keep them for at least three years in case the IRS asks.

The key difference from a W-2 employee: you deduct expenses on Schedule C, not on your personal tax return. This means you reduce your self-employment income first, then pay taxes on what remains. A W-2 employee takes a standard deduction or itemizes; you do both — you reduce your business income and then take the standard deduction on top of that.

The most common mistake is deducting personal expenses. If you work from home but also live there, you cannot deduct your entire mortgage or rent. If you drive to the grocery store and then to a client meeting, you can only deduct the client meeting miles, not the grocery trip. The expense has to be for the business, not something you would pay anyway.

Key Takeaways

  • You deduct business expenses on Schedule C to reduce your taxable self-employment income before calculating what you owe.
  • Common deductible expenses include a home office (if you use a dedicated space), vehicle mileage for work, supplies, software subscriptions, and professional services like accounting or legal fees.
  • You must keep receipts and records for three years, even though you do not attach them to your return.
  • Personal expenses — groceries, commuting to a regular office, meals that are not business-related — cannot be deducted, and mixing them with business expenses triggers IRS scrutiny.
  • If you deduct a home office, you must use either the simplified method ($5 per square foot, up to 300 square feet) or actual expense method, and the choice affects what you can deduct in future years.

Home office deductions: simplified or actual expenses

If you have a dedicated space in your home where you work and do nothing else, you can deduct part of your rent or mortgage, utilities, and home maintenance. You have two methods, and you pick one each year on Schedule C.

The simplified method lets you deduct $5 per square foot of dedicated office space, up to 300 square feet (maximum $1,500 per year). You measure the room, multiply by $5, and enter that number. No receipts needed. This is faster and often better if your home expenses are low or your office is small.

The actual expense method means you calculate the percentage of your home used for business (office square footage divided by total home square footage) and deduct that same percentage of your mortgage interest or rent, property tax, utilities, insurance, repairs, and depreciation. This takes more record-keeping but often yields a larger deduction if you have a large office in an expensive home. If you choose this method, you must also depreciate the office portion of your home, which can create a tax bill when you sell the house.

Once you pick a method in the year you first claim the deduction, switching methods in later years is complicated and requires IRS permission. Choose carefully.

Vehicle and mileage deductions

You can deduct either the actual cost of operating your vehicle (gas, oil, repairs, insurance, registration) or the standard mileage rate, but not both in the same year. For 2024, the standard rate is set by the IRS and changes annually; you multiply your work miles by that rate.

The standard mileage method is simpler: you track the number of miles you drive for work (not your commute to a regular office, but trips to client sites, meetings, or to pick up supplies), and multiply by the current rate. You do not need receipts for gas or repairs. This method works well if you drive an older, paid-off vehicle or if your actual expenses are low.

The actual expense method means you track every dollar spent on the vehicle — gas, insurance, maintenance, registration, depreciation — and deduct the percentage that relates to business use. If you drive 60% for work and 40% for personal use, you deduct 60% of all vehicle costs. This method requires detailed records and often a mileage log to prove the business percentage. It works better if you have a newer, expensive vehicle with high operating costs.

Whichever method you use, you cannot deduct commuting to a regular workplace. If you are a consultant who works from home and drives to client sites, those miles count. If you are a 1099 employee who works at the same office every day, that drive is not deductible.

Supplies, equipment, and software

Office supplies (paper, pens, ink cartridges), software subscriptions, and tools directly used for your work are deductible. A laptop you use only for work, accounting software, design tools, or industry-specific applications all count.

Items under $2,500 can usually be deducted in full in the year you buy them (this is called Section 179 expensing). A desk, chair, monitor, or camera under that threshold goes on Schedule C as a deduction. Items over $2,500 (like a high-end workstation or vehicle) must be depreciated over several years instead.

If you buy something partly for business and partly for personal use, you can only deduct the business portion. A computer you use 70% for work and 30% for personal browsing is 70% deductible. You need to document that split.

Professional services and contract labor

Fees you pay to accountants, lawyers, bookkeepers, or other professionals for work related to your business are deductible. This includes tax preparation, business formation, contract review, or accounting services. If you hire a subcontractor or freelancer to do part of your work, that cost is deductible too.

Keep invoices from these vendors. If you pay someone more than $600 in a year, you will need to issue them a Form 1099-NEC in January, so get their tax ID number upfront and keep records of what you paid them and when.

Insurance, licenses, and memberships

Business liability insurance, professional liability insurance, and health insurance premiums you pay as a self-employed person are deductible. If you are a sole proprietor, you can also deduct half of your self-employment tax (the employer portion) as an above-the-line deduction on Form 1040, separate from Schedule C.

Professional licenses, certifications, and renewal fees are deductible if they are required for your work. Membership dues to professional organizations (a writers' guild, engineering society, or trade association) are deductible if the organization's primary purpose is to advance your profession, not to provide social or recreational benefits.

Continuing education and training courses that maintain or improve skills for your current business are deductible. A web developer taking a course on a new programming language can deduct it. A course to change careers into a different field is not deductible.

Meals, travel, and entertainment

Meals and entertainment are deductible only if they are directly tied to conducting business — you are meeting a client, prospect, or business associate, and you are discussing business. A meal alone at your desk is not deductible. A meal with a client where you discuss a project is 50% deductible (the IRS assumes half the cost is personal enjoyment).

You must document who you met, when, where, and what business was discussed. A credit card statement showing "Restaurant XYZ" is not enough; you need a note or receipt that explains the business purpose.

Travel for business — flights, hotels, rental cars — is deductible if the primary purpose is business. A trip where you spend three days in meetings and two days sightseeing is mostly deductible; a trip where you spend two days sightseeing and one day in a meeting is mostly personal. Airfare and hotel are deductible; meals are 50% deductible; entertainment is 0% deductible as of 2018 (the tax law changed).

What you cannot deduct

Personal expenses are never deductible, even if they happen to benefit your work. Haircuts, clothing (unless it is a uniform or safety gear required for your job), gym memberships, and commuting to a regular office are personal. Meals that are not business-related, personal vehicle insurance, and your mortgage or rent (except the home office portion) are personal.

Expenses that are lavish or extravagant are not deductible. The IRS looks for reasonableness. A $500 pen is not ordinary and necessary; a $50 office chair is.

Fines and penalties — parking tickets, speeding tickets, professional discipline fines — are not deductible. Lobbying expenses and political contributions are not deductible. Expenses for activities that are illegal or against public policy are not deductible.

If you deduct something and the IRS disagrees, you may owe back taxes, interest, and penalties. The burden is on you to prove the expense was ordinary and necessary and directly tied to your business income.

Frequently Asked Questions

Do I need to keep receipts to claim deductions on my 1099 tax return?

You do not attach receipts to your return, but you must keep them for at least three years. If the IRS audits you, they will ask for proof that the expenses were real and business-related. A credit card statement alone is usually not enough; you need an invoice, receipt, or other document showing what you bought and when.

Can I deduct my internet bill if I work from home?

Only the business portion. If you use your internet for work and personal use, you can deduct the percentage that is business-related. If you have a dedicated business line, the entire cost is deductible. Document how you calculated the split — for example, "80% work, 20% personal" — in case the IRS asks.

What if I use my personal vehicle for both work and personal driving?

You deduct only the work miles. Keep a mileage log showing the date, destination, miles driven, and business purpose for each trip. At the end of the year, add up the work miles and multiply by the IRS standard mileage rate. Personal miles (commuting, errands, social trips) are not deductible.

Can I deduct a home office if I also use the space for personal activities?

No. The space must be used regularly and exclusively for business. A bedroom that doubles as an office does not may have access to. A spare room you use only for work, or a dedicated desk in a corner of your home that you use only for business, does may have access to. The key word is exclusive.

If I deduct a large home office, will that trigger an audit?

A home office deduction does not automatically trigger an audit, but it is one of the items the IRS reviews more often. Keep good records — photos of the space, measurements, and documentation of your business use — and be prepared to explain why the deduction is reasonable for your income level. A $10,000 home office deduction on $12,000 of income looks suspicious; a $3,000 deduction on $100,000 of income looks normal.