W-2 vs 1099: What Actually Changes in Your Taxes

A W-2 reports wages paid to an employee; a 1099-NEC reports payments to an independent contractor. The same $100,000 of income produces a materially different tax bill and a completely different compliance calendar depending on which form it arrives on, so understanding the mechanics matters whether you are choosing between offers or classifying someone you pay.

The biggest difference is payroll tax. An employee pays 6.2 per cent Social Security on wages up to the 2026 wage base of $184,500 and 1.45 per cent Medicare on everything, and the employer pays an identical amount out of its own pocket. A contractor is both the worker and the business, so they owe the full 15.3 per cent as self-employment tax. Two partial reliefs apply: the tax is computed on 92.35 per cent of net earnings rather than the whole amount, and half of the resulting self-employment tax is deductible against income tax.

Withholding is the next difference. An employee's income tax is withheld from each paycheck based on the Form W-4 they filed, so the April return is usually a small settlement either way. A contractor receives gross payments and must make quarterly estimated tax payments — due 15 April, 15 June, 15 September and 15 January — covering both income tax and self-employment tax. Miss them and an underpayment penalty accrues even if you pay in full by the deadline.

Contractors gain a real advantage on deductions. Business expenses come off gross receipts on Schedule C before any tax is calculated: software, professional subscriptions, a proportionate home office, business mileage, equipment, professional insurance, bank fees and the business share of a phone plan. Self-employed people may also deduct health insurance premiums for themselves and their family, and may qualify for the qualified business income deduction of up to 20 per cent of net business profit. Employees lost the ability to deduct unreimbursed work expenses in 2018.

Retirement saving is also more generous for the self-employed. A solo 401(k) or SEP-IRA allows contributions far above the employee elective limit of a workplace plan, because the contractor contributes both as employee and as employer. For a profitable freelancer this is often the largest single tax-planning lever available, and it must be set up before year end even if funded later.

Against all that, employees receive benefits with substantial cash value that never appear on the pay stub: employer-subsidised health insurance, a 401(k) match, paid leave, disability cover, unemployment insurance and workers' compensation. A rough rule used by recruiters is that a contractor rate needs to be 25 to 40 per cent above an equivalent salary to break even once self-employment tax, health insurance and unpaid leave are funded privately.

Classification is not a choice the parties can simply agree. The IRS examines behavioural control, financial control and the nature of the relationship: who sets the hours, who supplies the tools, whether the worker can profit or lose, whether the arrangement is open-ended, whether the work is central to the payer's business. Misclassifying an employee as a contractor exposes the business to back payroll taxes, penalties and interest, and several states apply an even stricter test than the federal one.

If you hold both kinds of income in the same year — a salary plus freelance work — remember that the Social Security wage base is shared. Wages fill it first, and self-employment earnings only attract the Social Security component on whatever room remains, though the Medicare component applies to all of it. Our US calculator handles that interaction, which is the part hand-built spreadsheets almost always get wrong.