Self-Employment Tax in New Mexico (2026)

Fact-checked by the LegalGlass editorial team against primary sources · Published Aug 6, 2026 · Last updated Aug 6, 2026

Self-employment (SE) tax is a federal 15.3% tax on net self-employment earnings - 12.4% for Social Security (up to the annual wage base) plus 2.9% for Medicare - reported on Schedule SE. It is separate from income tax. In New Mexico you also pay state income tax, and self-employed people often owe New Mexico gross receipts tax on their sales and services.

What Is Self-Employment Tax?

Self-employment tax funds Social Security and Medicare for people who work for themselves. When you are an employee, you and your employer each pay half of these payroll taxes. When you are self-employed - a sole proprietor, independent contractor, partner, or single-member LLC owner - you pay both halves yourself, which is what SE tax collects.

SE tax is separate from income tax. You can owe SE tax even in a year when your income tax is low, because it is based on net self-employment earnings rather than taxable income after deductions. It applies once you have $400 or more of net self-employment earnings in a year.

Understanding SE tax matters because it is often a self-employed person's largest tax after income tax, and it is easy to overlook when setting prices or saving for taxes. This page explains the federal SE tax and how New Mexico's income tax and gross receipts tax fit alongside it. For the national explainer, see self-employment tax.

The 15.3% Rate, Explained

The SE tax rate is 15.3% of net self-employment earnings, made up of two parts. The Social Security portion is 12.4%, and it applies only up to the annual Social Security wage base - a dollar cap that the Social Security Administration adjusts each year. Earnings above that cap are not subject to the 12.4% part.

The Medicare portion is 2.9%, and it has no cap - it applies to all net self-employment earnings. Higher earners also pay an Additional Medicare Tax of 0.9% on earnings above a threshold set by filing status, on top of the 2.9%.

One nuance reduces the bite: you calculate SE tax on about 92.35% of your net earnings (not 100%), because you are allowed to exclude the employer-equivalent portion first. Check the current wage base on the Social Security Administration site, since it changes annually. The statutory basis is 26 U.S.C. § 1401.

Reporting SE Tax on Schedule SE

You calculate and report SE tax on Schedule SE (Form 1040), which you file with your personal federal return. You first determine your net profit - typically from Schedule C for a sole proprietor or single-member LLC, or from a Schedule K-1 for a partner - and then compute SE tax on that amount.

The result is added to your income tax on Form 1040, so your total federal liability includes both. Because the two taxes are calculated separately but paid together, it is important not to plan only for income tax and forget SE tax when you set aside money.

Keeping clean records of business income and deductible expenses directly affects SE tax, since it is based on net profit - legitimate business deductions lower both your income tax and your SE tax. See business tax for how these returns fit together, and consider the free self-employment tax calculator to estimate the amount.

The One-Half SE Tax Deduction

To mirror how employees are treated, the tax code lets you deduct one-half of your self-employment tax when figuring your adjusted gross income. This is an "above-the-line" deduction, meaning you get it whether or not you itemize, and it reduces your income tax (not the SE tax itself).

Practically, this deduction offsets the fact that you are paying both the employer and employee shares. It does not eliminate the extra cost of being self-employed, but it softens it by lowering the income on which your income tax is calculated.

Do not confuse this with a reduction in the SE tax you owe - you still pay the full 15.3% on your net earnings; the deduction only affects income tax. This is one reason careful bookkeeping and, for some, professional tax help pay off. See how the deduction interacts with New Mexico income tax below.

Paying Quarterly Estimated Taxes

Because no employer withholds tax from your self-employment income, you generally must pay quarterly estimated taxes to cover both income tax and SE tax during the year. The IRS expects these payments on a roughly quarterly schedule using Form 1040-ES; missing them can trigger an underpayment penalty even if you pay in full at year-end.

A common approach is to set aside a percentage of each payment you receive - often 25% to 35%, depending on your income and state taxes - so the money is there when estimates are due. Self-employed people who underestimate SE tax are frequently surprised by a large bill, so build it into your pricing and savings.

New Mexico similarly expects estimated state income tax payments if you will owe enough, and gross receipts tax is filed on its own schedule (below). Coordinating federal estimates, New Mexico income tax estimates, and GRT filings is the core of staying current as a self-employed New Mexican. See IRS estimated taxes.

New Mexico State Income Tax

New Mexico imposes a state personal income tax with progressive brackets, and your self-employment profits are taxed as personal income on your New Mexico return. This is in addition to federal income tax and federal SE tax - three separate obligations on the same underlying earnings.

You report business income on your New Mexico personal income tax return filed with the New Mexico Taxation and Revenue Department. If you expect to owe a meaningful amount, New Mexico requires estimated state payments during the year, similar to the federal system.

Because New Mexico rates and brackets can change, confirm current figures with the Taxation and Revenue Department before relying on them. Note that New Mexico income tax is distinct from the gross receipts tax discussed next, which many self-employed people mistakenly overlook. See New Mexico LLC tax filing for entity-level detail.

New Mexico Gross Receipts Tax on the Self-Employed

New Mexico is unusual: instead of a conventional sales tax, it imposes a gross receipts tax (GRT) that applies broadly to services as well as goods. This is the single most important New Mexico-specific point for self-employed people, because in many states services are untaxed - but in New Mexico, a freelancer, consultant, or contractor generally owes GRT on their receipts.

The GRT is imposed on the seller (you), though in practice it is often passed on to customers. You must register with the Taxation and Revenue Department, obtain a business tax identification, and file GRT returns on the schedule assigned. The combined GRT rate varies by location within New Mexico, since it includes state and local components.

Missing GRT registration is a common and costly mistake for New Mexico self-employed workers who assume "no sales tax on services." Some receipts may be deductible or exempt, so review the rules or consult a professional. Between federal SE tax, New Mexico income tax, and GRT, New Mexico's self-employed face three distinct tax systems - plan for all three. See New Mexico business registration.

Frequently Asked Questions

What is the self-employment tax rate in New Mexico?

The self-employment tax is a federal 15.3% - 12.4% for Social Security up to the annual wage base plus 2.9% for Medicare. New Mexico does not add its own SE tax, but it does impose state income tax and gross receipts tax.

Do New Mexico freelancers pay gross receipts tax?

Usually yes. New Mexico's gross receipts tax applies to services as well as goods, so self-employed consultants, freelancers, and contractors generally must register with Taxation and Revenue and file GRT returns on their receipts.

How do I pay self-employment tax in New Mexico?

You calculate it on Schedule SE with your federal return and pay it, along with income tax, through quarterly estimated payments using Form 1040-ES. New Mexico income tax estimates and gross receipts tax are filed separately.

Is self-employment tax the same as income tax?

No. Self-employment tax funds Social Security and Medicare and is 15.3% of net earnings, separate from income tax. You can owe SE tax even when income tax is low, and you pay both on your federal return.

Can I deduct self-employment tax in New Mexico?

You can deduct one-half of your federal self-employment tax when figuring adjusted gross income, which lowers your income tax. It does not reduce the SE tax itself, and it flows through to your New Mexico return via AGI.

Related

• Self-Employment Tax (cluster hub)
• Self-Employment Tax Calculator
• Sole Proprietorship in New Mexico
• How to Get an EIN
• Self-Employment Tax in Arizona (sibling)
• Self-Employment Tax in Colorado (sibling)

Sources

1. IRS - Self-Employment Tax (Social Security and Medicare Taxes).
2. IRS - About Schedule SE (Form 1040).
3. IRS - Estimated Taxes.
4. IRS - About Form 1040-ES.
5. IRS - Tax Topic 554, Self-Employment Tax.
6. IRS - Additional Medicare Tax.
7. Social Security Administration - Contribution and Benefit Base (wage base).
8. New Mexico Taxation and Revenue - Gross Receipts Tax Overview.
9. New Mexico Taxation and Revenue - Personal Income Tax.
10. New Mexico Taxation and Revenue - Register Your Business.
11. IRS - About Schedule C (Form 1040).
12. Cornell Law School Legal Information Institute - 26 U.S. Code Sec. 1401 (Rate of tax).
13. Cornell Law School LII - Self-Employment Tax.

LegalGlass provides general information for educational purposes and is not a law firm or a substitute for advice from a licensed attorney or tax professional. Laws, fees, and thresholds change; verify current requirements with the IRS and the New Mexico Taxation and Revenue Department before acting.