As a 1099 worker, your tax write-offs fall into three buckets: ordinary and necessary business expenses you report on Schedule C, above-the-line adjustments like half of your self-employment tax and your health insurance premiums, and the qualified business income deduction that shaves 23 percent off your net profit in 2026. The IRS defines a deductible business expense as one that is common in your line of work and helpful for running it.1Office of the Law Revision Counsel. 26 USC 162 – Trade or Business Expenses Everything below fits inside those rules.
Half of Your Self-Employment Tax
Self-employment tax runs 15.3 percent (12.4 percent Social Security, 2.9 percent Medicare) on your net earnings, with the Social Security portion capped at the first $184,500 for 2026.2Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) An employee only pays half that rate because the employer covers the other half. You get to deduct the equivalent of that employer half as an adjustment to income on Schedule 1.3Internal Revenue Service. Topic No. 554, Self-Employment Tax
The number comes off Schedule SE and lowers your adjusted gross income, which can help you qualify for other credits and deductions farther down the return. Tax software handles it automatically. If you file on paper, it’s one of the easiest deductions to miss.
The Home Office Deduction
A home office qualifies only if a specific area is used regularly and exclusively as your principal place of business or a place where you meet clients. Exclusively means what it says: a desk you also use for personal email won’t cut it. No separate room is required, but the space cannot serve double duty.4Office of the Law Revision Counsel. 26 USC 280A – Disallowance of Certain Expenses in Connection With Business Use of Home
You choose one of two methods each year. The simplified method gives you $5 per square foot up to 300 square feet, for a maximum of $1,500.5Internal Revenue Service. Simplified Option for Home Office Deduction The actual expense method uses the percentage of your home devoted to the office and applies it to rent or mortgage interest, property taxes, utilities, and homeowner’s insurance, reported on Form 8829.6Internal Revenue Service. Instructions for Form 8829 (2025)
The actual method usually produces a larger deduction, but there’s a catch worth knowing about before you commit. You also claim depreciation on the business-use portion of your home, and when you sell, the IRS recaptures that depreciation at a rate of up to 25 percent, even if the rest of your gain qualifies for the primary residence exclusion.7Internal Revenue Service. Depreciation and Recapture 3 The simplified method treats depreciation as zero and sidesteps the issue. If a sale is on the horizon, factor that in.
Internet and phone bills get prorated between business and personal use, and only the business share is deductible. A second phone line dedicated entirely to work is fully deductible with no split.
Vehicle Costs and Business Travel
Two methods again, chosen each year. The standard mileage rate for 2026 is 72.5 cents per mile and bundles in gas, insurance, depreciation, and maintenance.8Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents Per Mile The actual expense method deducts real fuel, repairs, insurance, and lease payments in proportion to business miles. If you want the option to switch later, start with the standard rate in the first year you use the vehicle for business.9Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses
Commuting between your home and a regular workplace is never deductible. Business travel means leaving your general work area for a trip long enough to require sleep or rest. Miscategorizing commuting miles as business travel can draw a 20 percent accuracy-related penalty on the resulting underpayment.10Internal Revenue Service. Accuracy-Related Penalty
On overnight business trips, airfare, train tickets, lodging, and incidentals are deductible in full. Meals while traveling are deductible at 50 percent of the cost.9Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses Record the date, location, amount, and business purpose of each meal. For any expense other than lodging, receipts are required at $75 or more; lodging always needs a receipt regardless of amount.
Equipment, Supplies, and Software
Computers, printers, cameras, and similar equipment can be written off in the year you place them in service instead of depreciated over several years. Section 179 lets you expense qualifying equipment immediately, up to $2,560,000 for 2026.11Office of the Law Revision Counsel. 26 USC 179 – Election to Expense Certain Depreciable Business Assets For anything used for both work and personal purposes, only the business-use percentage is deductible. A laptop used 70 percent for client work gets a 70 percent deduction, and a usage log is worth keeping if you expect any scrutiny.
Everyday supplies like paper, ink, and postage are fully deductible in the year you buy them. Software subscriptions, cloud storage, and project management tools work the same way. If you sell physical products, raw materials and inventory flow through cost of goods sold on Schedule C rather than as a straight expense.
Contract Labor and Professional Fees
Fees paid to a CPA who prepares your business return, an attorney who drafts a contract, or a bookkeeper who manages your records all deduct on Schedule C. The work has to connect to the business; a lawyer handling a personal matter doesn’t qualify.
Payments to subcontractors and freelancers are deductible as contract labor. Starting in 2026, if you pay any single contractor $2,000 or more during the year, you must file Form 1099-NEC by January 31 of the following year.12Internal Revenue Service. General Instructions for Certain Information Returns (2026) The threshold was $600 in prior years. Missing the filing when it’s required can trigger penalties.
Advertising and Startup Costs
Money spent attracting clients is deductible if it relates to your current business. Website hosting, domain registrations, pay-per-click campaigns, social media ads, business cards, and brochures all qualify. Sponsoring a local event can qualify if the primary purpose is promoting your business. Political contributions are never deductible.13Internal Revenue Service. Nondeductible Lobbying and Political Expenditures
Advertising spent before the business officially opens gets different treatment. The first $5,000 of startup expenses can be deducted in the year the business begins, but only if total startup costs stay at or below $50,000. Amounts above that first $5,000 are spread over 180 months.14Office of the Law Revision Counsel. 26 USC 195 – Start-Up Expenditures Once you’re up and running, there’s no annual cap on advertising, though the amount has to remain reasonable.
Health Insurance and Retirement Contributions
Health insurance premiums for yourself, your spouse, and your dependents are deductible as an adjustment to income on Schedule 1, calculated on Form 7206.15Internal Revenue Service. Instructions for Form 7206 (2025) Two limits apply. You can’t take the deduction for any month you were eligible for an employer-sponsored plan through a spouse or another job, and the deduction can’t exceed your net self-employment income. It cannot create a business loss.
Retirement contributions offer some of the largest write-offs available. A SEP IRA lets you contribute up to 25 percent of your net self-employment earnings, capped at $69,000 for 2026.16Internal Revenue Service. SEP Contribution Limits (Including Grandfathered SARSEPs) A Solo 401(k) combines an employee elective deferral of up to $24,500 with an employer profit-sharing contribution of up to 25 percent of net earnings. If you’re 50 or older, an $8,000 catch-up contribution brings the elective deferral piece to $32,500.17Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026
Both plans reduce adjusted gross income even if you take the standard deduction. Contributions must be in by the tax filing deadline, including extensions. Overcontributing triggers a 6 percent excise tax each year the excess sits in the account, so run the numbers before you fund.18Office of the Law Revision Counsel. 26 USC 4973 – Tax on Excess Contributions to Certain Tax-Favored Accounts
Professional Development and Dues
Education that maintains or improves skills you already use is deductible. Online courses, workshops, trade conferences, and certifications tied to your current work all count, and so do dues to professional associations.
The IRS draws a hard line between improving existing skills and preparing for a new career. A freelance graphic designer can deduct an advanced typography course. That same designer can’t deduct law school tuition, because the education qualifies them for a different profession. Conference travel follows the normal business travel rules, and when a trip mixes professional sessions with vacation days, only the education-related costs are deductible. Keep the agenda and any attendance records.
The 23 Percent Qualified Business Income Deduction
Separate from anything you spend, the qualified business income deduction under Section 199A lets you exclude a slice of your net profit from tax. The One Big Beautiful Bill Act made the deduction permanent and raised it from 20 percent to 23 percent starting in 2026.19Internal Revenue Service. Qualified Business Income Deduction You claim it on your personal return whether you itemize or take the standard deduction.
Income-based limits apply. Service businesses like consulting, accounting, law, and health care see the deduction phase out once taxable income clears certain thresholds, which were also adjusted upward for 2026. Non-service businesses face fewer restrictions but can still hit limits at higher income levels based on wages paid and the cost of business property.
For most freelancers under the phase-out thresholds, the math is simple: take net Schedule C income, multiply by 0.23, and reduce taxable income by that amount. On $80,000 of net profit, that’s an $18,400 deduction before you count any of the write-offs above. You don’t need to spend anything to claim it.
Quarterly Payments So Your Deductions Actually Count
Nobody withholds tax from a 1099 check, so the IRS expects quarterly estimated payments. The 2026 deadlines are:20Internal Revenue Service. Estimated Tax
- April 15, 2026, for income earned January through March
- June 15, 2026, for income earned April through May
- September 15, 2026, for income earned June through August
- January 15, 2027, for income earned September through December
Underpaying triggers an interest-style penalty. For the first quarter of 2026, the rate is 7 percent per year, compounded daily.21Internal Revenue Service. Interest Rates Remain the Same for the First Quarter of 2026 You avoid the penalty entirely if you owe less than $1,000 at filing or pay at least 100 percent of last year’s tax through your quarterly payments. If your adjusted gross income exceeded $150,000 in the prior year ($75,000 if married filing separately), the safe harbor rises to 110 percent of last year’s tax.22Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty Every deduction listed above lowers the net income that drives those payments, which is the practical reason for tracking expenses as they happen instead of hunting for receipts in April.