New Mexico Corporate Income Tax: Rate, Filing, and Credits

The New Mexico corporate income tax is a flat 5.9% on taxable income, paired with a separate $50 annual franchise tax that every corporation owes regardless of whether it had any income. Both are reported on Form CIT-1 and due by the 15th day of the fourth month after the close of the tax year, which is April 15 for calendar-year filers.1New Mexico Taxation & Revenue Department. Filing Requirements

Which Corporations Have to File

The tax reaches every domestic corporation and every foreign corporation that transacts business in, into, or from New Mexico or earns income from property or employment in the state.2New Mexico Taxation & Revenue Department. Corporate Income and Franchise Tax Overview Physical presence through offices, employees, or property creates nexus. So does revenue from New Mexico customers under the economic nexus standard most states now apply.

The $50 franchise tax has a wider net than the income tax. Every domestic and foreign corporation that exercises its corporate franchise in New Mexico owes it, S corporations included, and it is due even if the company is dormant for the year or owes nothing in income tax.2New Mexico Taxation & Revenue Department. Corporate Income and Franchise Tax Overview There is no separate form; the $50 is reported on the CIT-1 alongside any income tax. This is where inactive corporations most often slip up.

The 5.9% Flat Rate

New Mexico applies a single 5.9% rate to all corporate taxable income. The state previously used two brackets, with 4.8% on the first $500,000 and 5.9% above that, but H.B. 252 (signed in March 2024) eliminated the lower bracket effective January 1, 2025.3Deloitte. New Mexico New Law Provides Flat Corporate Income Tax Rate and Includes Subpart F Income in Tax Base There is no separate minimum income tax beyond the $50 franchise tax.

How Taxable Income Is Figured

Start with federal taxable income as computed under the Internal Revenue Code, then apply the adjustments in Section 7-2A-2 to arrive at New Mexico base income.4Justia. New Mexico Code 7-2A-2 – Definitions

Add back to federal taxable income:

Subtract from federal taxable income:

Combined Reporting for Unitary Groups

Since January 1, 2020, corporations that are part of a unitary group must file a combined return. The default is worldwide combined reporting, which pulls in every member regardless of where it is incorporated or operates. A group may elect water’s-edge reporting on its first return filed on or after that date, which excludes foreign affiliates deriving less than 20% of their property, payroll, and sales from U.S. locations.6New Mexico Legislature. SB0335 Once elected, the filing basis cannot be changed without permission from the TRD secretary. All members of a combined group are jointly and severally liable for the tax.

Apportionment for Multistate Corporations

A corporation doing business in more than one state does not pay New Mexico tax on all its income. Business income is apportioned using a formula that compares New Mexico activity to activity everywhere.

The default formula gives equal weight to three factors: property, payroll, and sales. Each factor is a ratio of New Mexico amounts to total amounts; the three ratios are added and divided by three, and the resulting percentage is applied to total business income.7Justia. New Mexico Code 7-4-10 – Apportionment of Business Income

Two kinds of businesses can elect single sales factor apportionment, which typically lowers the New Mexico bill for companies with meaningful property and payroll in the state:

  • Manufacturers and computer processing facilities, if 80% or more of the filing group’s New Mexico property and payroll factors are used in manufacturing or computer processing.7Justia. New Mexico Code 7-4-10 – Apportionment of Business Income
  • Corporations or filing groups with a New Mexico headquarters.

Non-business income, such as a gain from selling real estate unrelated to the company’s main operations, is generally allocated directly to the state where the asset sits rather than running through the apportionment formula.

Credits Worth Knowing

Federal deductions flow through because New Mexico starts from federal taxable income. The planning opportunities that move the needle are the state’s targeted credits, which reduce tax owed dollar for dollar.

High-Wage Jobs Tax Credit

The credit equals 8.5% of wages paid to an eligible employee in a qualifying new job, capped at $12,750 per job per qualifying period.8Justia. New Mexico Code 7-9G-1 – High-Wage Jobs Tax Credit Qualifying High-Wage Jobs For jobs created on or after July 1, 2015, the position must pay at least $60,000 a year if located in or near a city of 60,000 or more, or $40,000 in smaller communities. The employee must hold the position for at least 44 weeks of a qualifying 12-month period, and the credit can be claimed for up to four consecutive qualifying periods per job. It applies to jobs created before July 1, 2026.

Angel Investment Credit

Accredited investors in qualifying New Mexico startups can claim up to 25% of their investment, capped at $62,500 per investment.9Justia. New Mexico Code 7-2-18.17 – Angel Investment Credit The target company must be headquartered in New Mexico, engaged in research or manufacturing, with no more than 100 full-time-equivalent employees and no more than $5 million in gross revenue. Businesses in finance, professional services, insurance, real estate, construction, mining, and retail, among others, are excluded.

Technology Jobs and Research and Development Credit

Corporations conducting qualified research at a New Mexico facility can claim a basic 5% credit on qualified research expenditures, plus an additional 5% credit for a combined 10%.10Justia. New Mexico Code 7-9F-5 – Basic Credit

Filing, Extensions, and Estimated Payments

Every corporation subject to the income tax or the franchise tax files Form CIT-1. The return is due the 15th day of the fourth month after the close of the tax year, and electronic filing is available through the Taxpayer Access Point (TAP).1New Mexico Taxation & Revenue Department. Filing Requirements An extension gives you more time to file, not more time to pay. The tax still has to be paid by the original due date.

A corporation with current-year tax of $5,000 or more after credits must make quarterly estimated payments. Four installments of 25% each are due on the 15th day of the 4th, 6th, 9th, and 12th months of the tax year, which for calendar-year filers means April 15, June 15, September 15, and December 15.11Justia. New Mexico Code 7-2A-9.1 – Estimated Tax Due

Several safe harbors let you avoid underpayment penalties:

  • At least 80% of the actual current-year liability.
  • 100% of the prior year’s tax, if that year was a full 12 months.
  • 110% of the tax from two years prior, if the previous year’s return has not been filed and its extended due date has not passed.
  • A quarter-by-quarter method where each quarter’s payment covers at least 80% of that quarter’s actual liability.

Falling short on any of these triggers interest and penalties on the underpayment.11Justia. New Mexico Code 7-2A-9.1 – Estimated Tax Due

If You Are Not a C Corporation

S corporations, partnerships, and LLCs taxed as partnerships are not subject to the corporate income tax, but they can elect to pay a 5.9% entity-level tax on distributed net income for tax years beginning on or after January 1, 2022.12New Mexico Taxation & Revenue Department. Pass-Through Entity The election is a workaround for the federal $10,000 cap on state and local tax deductions. S corporations still owe the $50 franchise tax.

Penalties and Interest for Missing the Deadline

The penalty for failing to file or failing to pay on time is 2% of the unpaid amount for each month or part of a month the obligation remains outstanding, capped at 20%, when the failure is due to negligence or disregard of TRD rules without intent to evade.13Justia. New Mexico Code 7-1-69 – Civil Penalty for Failure to Pay Tax or File a Return A corporation five months late is already at 10%, and the cap hits at month ten.

Willful tax evasion carries a 50% penalty on the tax due, with a $25 minimum, on top of the unpaid tax and interest.13Justia. New Mexico Code 7-1-69 – Civil Penalty for Failure to Pay Tax or File a Return

Interest runs on unpaid tax from the original due date until paid. The rate is set quarterly and tracks the IRS individual underpayment rate; for the second quarter of 2026 it is 6%, calculated daily.14New Mexico Taxation & Revenue Department. Penalty Interest Rates Interest compounds and cannot be waived, so even a corporation that eventually settles a dispute over the tax owes interest for the full period the balance was outstanding.