Most contractors think about deductions as a way to reduce their tax bill. That framing is incomplete. A $10,000 deduction on $40,000 of net 1099 income doesn't just cut income tax. It cuts self-employment tax too, which runs 15.3% before income tax ever enters the picture. Miss that distinction and you're leaving about $1,413 in SE tax savings untouched, on top of whatever income tax reduction you were thinking about.
The test for any deduction is §162 of the Internal Revenue Code: the expense must be ordinary (common for your type of business) and necessary (helpful and appropriate for your business). That test is the gate. Pass it and the deduction belongs on Schedule C. Fail it and no amount of creative framing changes what the IRS will find in an audit.
Does Deducting Expenses Reduce Both Income Tax and Self-Employment Tax?
A deduction reduces your Schedule C net profit, and self-employment tax applies to that profit, not your gross receipts. The IRS calculates SE tax at 15.3% on 92.35% of your net earnings from self-employment. Income tax applies on top of that.
$10,000 deduction (2026)$40,000$10,000 in deductions: $30,000$10,000 × 0.9235 × 0.153 = $1,413$10,000 × 0.22 = $2,200~$3,613That $3,613 comes from one $10,000 deduction.
What Can You Write Off as a 1099 Worker?
The deductions the IRS rarely challenges are the ones with clear documentation and consistent business purpose. For 2026, the main categories on Schedule C are:
Vehicle expenses: You take either actual costs or the standard mileage rate. The 2025 Schedule C instructions set the standard mileage rate at 70 cents per mile for business use. Ten thousand business miles produces a $7,000 deduction, with parking and tolls added separately. The requirement is a contemporaneous mileage log: date, destination, business purpose, and odometer readings recorded at the time of the trip. A log reconstructed in March from memory is not a contemporaneous mileage log. The IRS knows the difference.
Home office: Two methods exist. The simplified method multiplies your dedicated workspace square footage (up to 300 square feet) by $5 per square foot, producing a maximum deduction of $1,500. The actual expense method uses Form 8829 to allocate a percentage of your actual home costs, including mortgage interest, rent, utilities, insurance, and repairs, based on the business-use percentage of your home. The simplified method is easier to defend. The actual expense method is larger for most people, but requires more documentation and carries more IRS scrutiny.
Business insurance: Errors and omissions coverage, general liability, and professional liability go on Schedule C, line 15. Health insurance is handled on a different form and covered in the next section.
Professional services: Accounting fees, attorney fees for business matters, and tax preparation costs attributable to your business go on Schedule C, line 17. The instruction text is precise: "fees for tax advice related to your business and for preparation of the tax forms related to your business." A CPA charging you $400 to file your Schedule C is deductible there. Filing fees for your personal return are not.
Continuing education: Courses that improve skills required in your current business are deductible. A graphic designer taking an advanced Illustrator course qualifies. A graphic designer taking a real estate licensing course does not. The IRS tests whether the education maintains or improves skills in your existing trade, not whether the subject matter might one day apply to a new career.
Does Health Insurance Count as a 1099 Deduction?
Health insurance premiums paid for yourself, your spouse, and dependents are 100% deductible for self-employed workers, but the deduction does not go on Schedule C. It goes on Schedule 1 (Form 1040), line 17. This is important because the deduction reduces your adjusted gross income, not your Schedule C profit, which means it does not reduce SE tax. The income tax savings are real. The SE tax savings are not.
The eligibility condition: you cannot deduct premiums for any month in which you were eligible for coverage under an employer-sponsored health plan, whether your own employer or a spouse's employer. Eligibility disqualifies the deduction even if you chose not to enroll.
Can I Deduct My Retirement Contributions as an Independent Contractor?
Retirement contributions follow the same pattern as health insurance. They reduce income tax but not SE tax. Contributions you make as the employer to your own SEP-IRA or Solo 401(k) go on Schedule 1 (Form 1040), line 16, not on Schedule C. The 2026 Schedule C instructions confirm that self-employed persons report their own retirement contribution deduction on Schedule 1. The Schedule C line 19 entry is for contributions made on behalf of employees, not for the owner's own retirement contributions.
Both a SEP-IRA and a Solo 401(k) allow substantial contributions relative to W-2-based retirement accounts. The specific contribution limits for 2026 are set in IRS guidance issued annually; check IRS Publication 560 for the current numbers before calculating your deduction.
Can I Write Off My Car on a 1099?
Yes, with two conditions. First, only the business-use percentage of vehicle costs is deductible. A car used 60% for business and 40% for personal driving generates a deduction on 60% of costs, whether you use the standard mileage rate or actual expenses. Second, the IRS requires a contemporaneous mileage log for any vehicle deduction. This is not optional and it is not something you can reconstruct with precision after the fact.
If you own a vehicle and placed it in service for business use in a prior year, your choice of method in the first year locks you in. Owners who took the standard mileage rate in the first year can switch between methods in subsequent years. Owners who started with actual expenses cannot switch to the standard mileage rate later.
Section 179 allows expensing the full cost of qualifying equipment in the year of purchase. For 2025, the maximum Section 179 deduction is $2.5 million. For a contractor buying a $4,000 laptop used 70% for business, Section 179 on $2,800 of the cost is cleaner than multi-year depreciation, but the business-use documentation requirement is the same.
Can I Deduct Internet and Cell Phone as a 1099 Contractor?
Partial deductions are available for both, with the requirement that you document and apply a consistent business-use percentage. The Schedule C instructions state that you cannot deduct the base rate of the first telephone line into your residence. The deductible amount is the business portion of costs above that base rate: a second dedicated business line, or the documented business percentage of your cell plan.
For a phone and internet plan totaling $180 per month, a freelancer who uses these services 60% for business can deduct $108 per month, or $1,296 per year. The 60% figure needs to be defensible: keep records of how you estimated it and use the same percentage year over year.
Client meals deduct at 50%. Entertainment expenses do not deduct at all, regardless of whether a client was present. The IRS eliminated the entertainment deduction, and that remains the rule for 2026. Food and drinks at a sporting event may still qualify at 50% if the food costs are stated separately from the entertainment on the receipt.
A graphic designer I worked with claimed $14,200 in home office improvement deductions. The IRS audited the return and found personal renovation costs mixed with the business expenses. They allowed $3,800. The additional tax on $10,400 in disallowed deductions, plus the 20% accuracy-related penalty, cost her $2,745 before the CPA fees to unwind it.
What Deductions Get Flagged in IRS Audits?
The IRS uses a statistical scoring system called the Discriminant Function (DIF) to flag returns where deduction amounts diverge from typical patterns for a given income level. Abnormally high deductions relative to income are a trigger. Mixed-use assets without documented business-use percentages are a trigger. A home office that doesn't meet the exclusive-use test is a trigger.
Three practices reduce audit exposure:
Separate accounts do not create an audit shield by themselves. A freelancer who runs personal groceries through a business account and calls it a business expense will lose that argument at audit, as §162 requires the expense to be ordinary and necessary for the business, not just paid from a business account.
Tracks deductible expenses automatically and separates personal from business transactions in real time.
For more on tracking what comes in, see How to Track Freelance Income for Tax Purposes.
What Does "1099 Employee" Mean for Tax Purposes?
The term doesn't exist in the tax code. A worker is either a W-2 employee or a 1099 independent contractor. The IRS applies behavioral, financial, and relationship control tests to determine the correct classification. A company that controls how you perform your work, provides your tools, and sets your hours may owe payroll taxes on your compensation regardless of what the contract says. Independent contractor status is not something either party elects by writing it into a contract.
If the classification is wrong, the IRS can reclassify the arrangement and assess back payroll taxes against the business that paid you.
For context on the quarterly obligations that make these deductions relevant, see How to Pay Quarterly Taxes as a Freelancer(opens in new tab) and Do Freelancers Need a Business Bank Account?(opens in new tab)