Tax Deductions for the Self-Employed: Ways to Reduce Taxable Income

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Self-employed taxpayers lower their taxable income in three places on the return: adjustments to income that come off before adjusted gross income (retirement contributions, half of self-employment tax, health insurance premiums), business expenses subtracted from gross receipts on Schedule C (home office, vehicle, phone, travel, supplies and similar costs), and the qualified business income (QBI) deduction, which applies after the standard or itemized deduction. Each layer works differently. Knowing which layer an expense belongs to tells you which form it goes on and whether it also reduces self-employment tax.

How the deduction layers fit together

Suppose a hypothetical freelancer has $80,000 in gross receipts and $15,000 in business expenses. Schedule C shows net profit of $60,000. Self-employment tax is figured on that $60,000 (more precisely, on 92.35% of it). The freelancer then subtracts half of the self-employment tax, any self-employed retirement contributions and health insurance premiums on Schedule 1 to reach adjusted gross income. The standard deduction comes next, and the QBI deduction after that.

That order explains why a $1,000 business expense is generally worth more than a $1,000 adjustment: the expense cuts the base for the 15.3% self-employment tax as well as income tax. Either way, a deduction saves roughly the amount deducted multiplied by your marginal rate. Only a tax credit reduces the tax itself.

Retirement plan contributions

Self-employed people can fund their own retirement plans, most commonly a SEP IRA, a solo 401(k) or a SIMPLE IRA, and deduct the contributions on Schedule 1. With a solo 401(k), you contribute in two roles: as the employee, through elective deferrals, and as the employer, through a matching or profit-sharing contribution. The combined total cannot exceed an annual cap, with catch-up contributions allowed on top of it for those 50 and older.

These limits change each year, including SIMPLE IRA limits and the age-50 catch-up. Retirement contributions are often the largest single lever a high-earning sole proprietor has. Withdrawals are taxed as ordinary income, and the taxes on IRA withdrawals depend on age and account type.

Self-employment tax deduction

Employees split Social Security and Medicare taxes with their employer, each paying 7.65%. Self-employed people pay both halves through self-employment tax: 12.4% for Social Security and 2.9% for Medicare, a total of 15.3%. The half an employer would normally pay is deductible as an adjustment to income, and both the tax and the deduction are figured on Schedule SE. This deduction lowers income tax only. Self-employment tax itself shrinks only when net profit does.

Home office deduction

A part of your home used regularly and exclusively for business qualifies for a home office deduction, whether you own or rent. A guest room that doubles as an office fails the exclusive-use test.

Expenses that can be partly counted include:

• Rent
• Deductible mortgage interest
• Utilities
• Homeowners or renters insurance
• Repairs and maintenance

You can calculate the deduction in one of two ways:

1. Regular method. Divide the office’s square footage by the home’s total square footage and apply that percentage to the indirect home expenses above. Expenses that relate only to the office, such as painting that room, are deducted in full. Depreciation on the business portion of an owned home is included. This method is reported on Form 8829, Expenses for Business Use of Your Home.
2. Simplified method. Multiply the office’s square footage by an IRS-set rate. The deduction is capped at $1,500, no depreciation is allowed, and the whole amount goes on Schedule C. Mortgage interest and property taxes stay fully available as itemized deductions on Schedule A if you itemize.

You can switch between methods from one year to the next. The regular method takes more recordkeeping but can produce a larger deduction for a large office or a high-cost home. Depreciation claimed under it can matter later if you sell, which affects capital gains tax on a home sale.

The deduction is self-reported, so keep measurements, photos of the space and expense records in case of an audit.

Health insurance premiums

If you are self-employed and not eligible for a health plan subsidized by your own or a spouse’s employer, you can deduct premiums for medical, dental and qualified long-term care insurance. Coverage for your spouse, your dependents and your children under age 27 counts too, even if those children are not your dependents.

Because this is an adjustment to income, you claim it whether you itemize or take the standard deduction. It is figured on Form 7206. Premiums for insurance that covers employees of your business are a separate matter: those are business expenses on Schedule C.

Vehicle use

Driving for business is deductible. Commuting and personal trips are not. For each business trip, record the date, the purpose and the miles driven. A mileage log kept at the time is far stronger evidence than one rebuilt at tax time.

There are two ways to calculate the deduction:

1. Standard mileage rate. Multiply business miles by the rate the IRS sets each year, then add business tolls and parking fees. The total goes on Schedule C.
2. Actual expense method. Work out business miles as a percentage of total miles. Apply that percentage to the full annual cost of running the car: gas, oil changes, repairs, insurance, registration and depreciation.

If you want the standard mileage rate available for a car, you must use it in the first year the car is used for business. After that, you can choose either method.

Qualified business income (QBI) deduction

The QBI deduction lets eligible owners of pass-through businesses (sole proprietorships, single-member LLCs, partnerships and S corporations) deduct up to 20% of their qualified business income. Partners and S corporation shareholders get their share of income on Schedule K-1.

Owners whose taxable income stays below set thresholds can claim the full 20%, whether or not they itemize. Above those thresholds, limits apply, and the type of business can determine whether any deduction remains. The One Big Beautiful Bill Act made the deduction permanent in 2025. Smaller cases use Form 8995. Those above the thresholds use Form 8995-A.

Other business expenses

These costs go on Schedule C.

• Internet and phone. Deduct the business share of internet service, website costs and your cell phone bill. The first landline in your home is not deductible even with a home office, but a second line used for business is.
• Meals. Meals while traveling for business, with a client or at a business conference can be deducted, generally at 50%. The meal must be separately identified on the receipt. Entertainment itself, such as event tickets, is not deductible.
• Travel. A trip qualifies when it lasts longer than an ordinary workday, requires sleep or rest, and takes you away from your tax home. You need to do business while you are there and keep detailed records of costs and activities.
• Interest. Interest on business loans is deductible. Credit card interest on business purchases is deductible even when the card is a personal one. Interest on personal purchases is not.
• Education. Courses, seminars and materials qualify only if they maintain or improve skills used in your current business. Training for a new career does not qualify.
• Business insurance. Premiums for business policies are deductible, such as liability, fire, business vehicle and employee group health coverage.
• Startup costs. Major costs are usually capital expenses recovered over time. Some startup costs, such as market research, travel to set up the business, legal fees and pre-opening advertising, can be deducted in your first active year. Organizational costs have a separate allowance of up to $5,000.
• Advertising. Business advertising is generally deductible, from social media and search ads to broadcast spots, flyers, signs and billboards.
• Office supplies and equipment. Paper, postage and printer ink are deductible when bought. Books, equipment and professional instruments are deductible too. If an item will be used for more than a year, the cost is generally recovered through depreciation.
• Professional and operating fees. Accountant and attorney fees, credit card processing fees (including those charged by payment services such as PayPal), and repairs or maintenance on business equipment are all ordinary business costs.

Records and limits worth knowing

• Mixed-use items need an allocation. A phone, car or home used partly for personal purposes is deductible only for the business share, and you need a reasonable, documented basis for that percentage.
• Paying yourself is not an expense. A sole proprietor’s draws from the business are not deductible wages. Profit is taxed whether or not you take it out. Health premiums, retirement contributions and home office costs have their own deduction rules.
• Deductions lower the tax but not the obligation to pay during the year. Self-employed people usually need to make estimated quarterly payments, and deductions shrink the amount owed on those payments.
• Classification affects your deductions. If a client sends you a Form W-9, they are treating you as an independent contractor, and the Schedule C deductions described here apply. Employees paid on a W-2 generally cannot deduct unreimbursed job expenses.

FAQs

The Bottom Line

Sole proprietors, freelancers and other independent contractors who file Schedule C benefit most from sorting each cost into the right layer of the return. Business expenses reduce both income tax and self-employment tax, while adjustments and the QBI deduction lower income tax only. Keeping mileage logs, home office measurements and a documented business share for mixed-use items supports these deductions and lowers the estimated quarterly payments owed during the year.