To report consulting income on your tax return, you file a Schedule C with your Form 1040 showing your gross receipts and business expenses, calculate self-employment tax on Schedule SE, and pay estimated taxes in four installments during the year rather than waiting until April. Your net profit from Schedule C flows to Schedule 1 as business income, and half of your self-employment tax comes back off as an adjustment. Because no employer withholds anything from client payments, you owe both income tax and the full 15.3% self-employment tax yourself.
Add Up Every Dollar Clients Paid You
Start with the forms. Any client who paid you $600 or more during the year should send a Form 1099-NEC by the end of January, and copies go to the IRS as well.1Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC The agency already knows about most of your income before you sit down to file.
Forms don’t capture everything, though. Payments under $600 from a single client, cash, and direct bank transfers are all taxable whether or not a form arrives. If clients pay you through PayPal, Venmo, Stripe, or a similar platform, you’ll receive a Form 1099-K once your payments cross $20,000 across more than 200 transactions.2Internal Revenue Service. Understanding Your Form 1099-K Below that, the income is still reportable. Track it as it arrives. Reconciling twelve months of deposits in March is miserable, and the number you put on Schedule C should reflect what you were paid, not just what got documented on a form.
Schedule C: Turning Receipts Into Net Profit
Schedule C works like an income statement for your consulting practice.3Internal Revenue Service. About Schedule C (Form 1040), Profit or Loss from Business (Sole Proprietorship) Gross receipts go at the top. Business expenses come off in Part II. What remains on Line 31 is your net profit, and that single figure drives the rest of your return: it sets your income tax base and it determines your self-employment tax.
A deductible expense has to be “ordinary” (common in consulting work) and “necessary” (helpful and appropriate for your business). It doesn’t have to be indispensable.4Internal Revenue Service. Instructions for Schedule C (Form 1040) Software subscriptions, professional development, client meals (deductible at 50%), office supplies, subcontractor payments, and professional insurance all qualify. The size of the expense doesn’t matter; the business purpose does.
Home Office
If a specific area of your home is used regularly and exclusively for consulting, you can claim a home office deduction on Line 30. Two methods are available. The simplified method gives you $5 per square foot up to 300 square feet, capped at $1,500.5Internal Revenue Service. Simplified Option for Home Office Deduction The actual-expense method, calculated on Form 8829, applies the business-use percentage of your home to real housing costs: rent or mortgage interest, utilities, insurance, and repairs.4Internal Revenue Service. Instructions for Schedule C (Form 1040) The actual method usually produces a larger deduction for consultants with high housing costs, though it takes more work.
Vehicle Use
Driving to client sites, conferences, or supply stores counts as a business expense. For 2026, the IRS standard mileage rate is 72.5 cents per mile.6Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents Per Mile The alternative is tracking actual costs (gas, insurance, repairs, depreciation) and deducting the business-use percentage. Most solo consultants use the mileage rate because a mileage log is all it requires. Commuting to a regular office doesn’t count, but if you work from a home office, every business trip starts there.
Equipment
Computers, monitors, and office furniture used for consulting are deductible. Rather than depreciating a $2,000 laptop across several years, the Section 179 deduction lets you write off the full cost in the year you purchased it. The 2026 expensing limit runs well above $2 million, so no solo consultant will reach it. The deduction can’t exceed your net business income for the year, so a thin-margin year may push part of it into a carryforward.
The 20% Qualified Business Income Deduction
Section 199A lets many self-employed taxpayers deduct up to 20% of their qualified business income. You claim it on Form 8995 (or Form 8995-A for higher earners), and it comes off taxable income rather than reducing self-employment tax.7Internal Revenue Service. Instructions for Form 8995 Under the One Big Beautiful Bill Act, this deduction is permanent starting in 2026.
There’s a catch specific to consultants. The IRS classifies consulting as a “specified service trade or business,” which means the deduction phases out as your taxable income rises. For 2026, single filers with taxable income (before QBI) below roughly $201,750 and married joint filers below $403,500 get the full 20%. Above those thresholds the deduction shrinks, and once you clear the upper end of the phase-in range it disappears for consulting income. Below the threshold, this is one of the largest tax breaks available: a consultant with $100,000 of net profit could shave $20,000 off taxable income.
Self-Employment Tax on Schedule SE
Self-employment tax covers Social Security and Medicare. You pay both the worker’s share and the employer’s share, for a combined 15.3%: 12.4% Social Security and 2.9% Medicare.8Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) You owe it once your net earnings from all self-employment activities reach $400 for the year.9Internal Revenue Service. Schedule C and Schedule SE
One quirk trips people up. The tax isn’t calculated on your full net profit. Schedule SE first multiplies your net earnings by 92.35%, and that reduced figure is your SE tax base.10Internal Revenue Service. Topic No. 554, Self-Employment Tax On $100,000 of net profit, the base would be $92,350, and 15.3% of that comes to roughly $14,130.
The 12.4% Social Security portion applies only up to the annual wage base, which is $184,500 for 2026.11Social Security Administration. 2026 Cost-of-Living Adjustment (COLA) Fact Sheet Earnings above that ceiling escape the Social Security piece. The 2.9% Medicare portion has no cap. An additional 0.9% Medicare tax applies to self-employment income above $200,000 (or $250,000 for married filing jointly).12Internal Revenue Service. Questions and Answers for the Additional Medicare Tax
After Schedule SE computes the tax, you get to deduct half of it as an adjustment to income on Schedule 1. That mirrors how W-2 employees never pay income tax on their employer’s FICA share. The deduction lowers your AGI and, in turn, your income tax.8Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes)
Health Insurance and Retirement Deductions
Two more deductions live above the line on Schedule 1. They reduce AGI but don’t touch self-employment tax.
If you pay for your own health insurance and aren’t eligible for coverage through a spouse’s employer plan, you can deduct 100% of the premiums for yourself, your spouse, and your dependents.13Internal Revenue Service. Instructions for Form 7206 The plan must be established under your business (though it can be in your personal name), and the deduction can’t exceed your net self-employment income. Calculate it on Form 7206 and carry it to Schedule 1.
Self-employed retirement accounts open up substantial deductions. A SEP IRA takes contributions of up to 25% of your net self-employment earnings (after the SE tax adjustment), capped at $72,000 for 2026.14Internal Revenue Service. SEP Contribution Limits (Including Grandfathered SARSEPs) A solo 401(k) reaches a similar total cap but adds an employee elective deferral, which can help if your net income is on the lower side. Either one reduces AGI dollar for dollar.
How the Numbers Land on Form 1040
Once Schedule C and Schedule SE are done, two supporting schedules carry the results onto your personal return.
Net profit from Schedule C, Line 31 goes to Schedule 1, Line 3 as “Business income or (loss).”15Internal Revenue Service. Schedule 1 (Form 1040), Additional Income and Adjustments to Income That combines with any W-2 wages, investment income, or rental income on Form 1040 to produce total income. On Schedule 1, Part II, your above-the-line adjustments appear: the deductible half of self-employment tax on Line 15, retirement contributions on Line 16, and self-employed health insurance on Line 17. These reduce total income to AGI.
The self-employment tax itself, meaning the full liability rather than the deduction for half, lands on Schedule 2, Line 4 under “Other Taxes.”16Internal Revenue Service. Schedule 2 (Form 1040), Additional Taxes That amount combines with your regular income tax on Form 1040. From the total, subtract estimated payments made during the year, any withholding from other income sources, and any credits. What’s left is a balance due or a refund.
Estimated Quarterly Payments
The IRS runs on pay-as-you-go. With no withholding on client checks, you send estimated payments four times a year using Form 1040-ES.17Internal Revenue Service. Estimated Taxes You’re required to make them if you expect to owe at least $1,000 for the year.18Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty Payment options include IRS Direct Pay, the IRS2Go app, or mailing a check with the voucher.
The four due dates don’t fall evenly across the calendar:
- April 15, covering January through March
- June 15, covering April and May
- September 15, covering June through August
- January 15 of the following year, covering September through December
Weekend and holiday dates roll to the next business day.17Internal Revenue Service. Estimated Taxes
To avoid an underpayment penalty, total estimated payments and withholding have to meet one of two safe harbors: 90% of the current year’s tax, or 100% of the prior year’s tax. If your prior-year AGI exceeded $150,000 ($75,000 if married filing separately), the prior-year test rises to 110%.18Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty First-year consultants rely on the 90% current-year test since they have no prior return; after that, matching last year’s number is usually easier.
If your consulting income is genuinely seasonal or clumped into certain quarters, the annualized income installment method on Schedule AI of Form 2210 lets you tie each payment to what you actually earned during that period.19Internal Revenue Service. Instructions for Form 2210 Use it for one quarter and you use it for all four.
Records to Keep
The IRS can audit returns filed within the last three years, and if it finds a substantial error, it can reach back six.20Internal Revenue Service. IRS Audits Every expense you deduct needs documentation: a receipt, invoice, or bank statement showing the amount, date, and business purpose. Missing records for one category can put your whole Schedule C in doubt.
Digital records are fine as long as the scans are legible, complete, and retrievable.21Internal Revenue Service. Rev. Proc. 97-22 A cloud accounting tool or a folder of photographed receipts works. For vehicle use, keep a contemporaneous mileage log with dates, destinations, and business purpose; the IRS is strict on car deductions without one. Sort expenses into the Schedule C categories (advertising, supplies, travel, professional fees, insurance, home office) as you go, so filing becomes a matter of copying totals rather than rebuilding a year from scratch.