A New Mexico LLC is a pass-through entity by default: the IRS treats a single-member LLC as a disregarded entity and a multi-member LLC as a partnership, so profit flows to the owners' personal returns. New Mexico personal income tax reaches 5.9%, but only on New-Mexico-sourced income. This 2026 guide covers federal default treatment, New Mexico state tax, the S-corp election, self-employment tax, non-resident filing with Form 5472, and BOI reporting under the March 21, 2025 FinCEN rule. New Mexico also charges no annual report or franchise tax.
A New Mexico LLC is a pass-through entity by default: a single-member LLC is a disregarded entity taxed on Schedule C of the owner's personal 1040, and a multi-member LLC is a partnership that files Form 1065 and issues K-1s. There is no federal entity-level tax in either case. Profit flows straight to the owners, who report it on their personal returns. This default treatment applies automatically the moment the LLC is formed - no election is needed. An LLC can change its federal treatment later by electing S-corporation or C-corporation status, but the pass-through default is what most New Mexico LLCs use.
New Mexico personal income tax reaches 5.9%, but it applies only to New-Mexico-sourced income. An LLC with no New-Mexico-sourced income owes no New Mexico state income tax. Because the LLC is a pass-through, the tax lands on the owners' personal returns rather than the entity. A non-resident owner earning income outside New Mexico owes nothing to the state. New Mexico also charges no franchise tax and no annual report fee, so beyond income tax on New-Mexico-sourced income, there is no recurring state tax on the entity itself.
An LLC can elect S-corporation treatment by filing IRS Form 2553, which lets the reasonable-salary portion of income avoid self-employment tax and saves 15.3% on the non-salary portion. It becomes worthwhile around $40,000-$60,000 in net annual income. Below that threshold, the payroll and compliance cost of running an S-corp outweighs the self-employment tax savings. Above it, the savings grow with income. The election adds a requirement to run payroll, pay a reasonable salary, and file a separate corporate return, so it suits an established, profitable LLC rather than a brand-new one.
A default New Mexico LLC owner pays 15.3% self-employment tax on net business income: 12.4% Social Security up to $168,600 plus 2.9% Medicare with no cap. This is on top of federal and any applicable state income tax. Electing S-corp treatment reduces the self-employment tax by splitting income into a reasonable salary (subject to payroll taxes) and distributions (not subject to self-employment tax). That saving comes with added payroll compliance. For owners under the $40,000-$60,000 net income range, the default pass-through treatment stays simpler and cheaper to run.
A single-member New Mexico LLC is a disregarded entity taxed on Schedule C of the owner's personal 1040. A multi-member LLC is a partnership that files Form 1065 and issues K-1s to members. Neither pays federal entity-level tax. The practical difference is the return that gets filed. A single-member owner reports business profit on their own 1040. A multi-member LLC files a partnership return and passes each member's share through on a K-1, which the member then reports personally. Both keep the pass-through benefit of taxing profit once, at the owner level.
It depends on whether the LLC has income effectively connected to a US trade or business. A non-resident-owned LLC with no US effectively connected income owes a Form 5472 information filing but no US income tax; with US effectively connected income, it is subject to US income tax. The distinction turns on where and how the income is earned, not on the owner's location. A foreign-owned single-member LLC files Form 5472 with a pro-forma 1120 each year regardless. An ITIN may be needed for personal US tax filing. Anonymousllc.co partners with US tax preparers familiar with non-resident filings, and every owner should confirm their position with one.
Form 5472 is an IRS information return required for any US disregarded entity with 25% or more foreign ownership. Most non-resident-owned single-member New Mexico LLCs must file it annually alongside a pro-forma Form 1120. It reports transactions between the LLC and its foreign owner, and it is an information filing, not a tax payment. Missing it carries a $25,000 penalty, so it is the one filing non-resident owners cannot skip. A US-resident-owned single-member LLC does not file Form 5472; it reports on Schedule C instead. Anonymousllc.co's partner tax preparers handle the 5472 and pro-forma 1120 for non-resident clients.
For most, no. Under the March 21, 2025 FinCEN interim final rule, domestic reporting companies are exempt from BOI reporting, and most New Mexico LLCs are domestic and file nothing. Foreign reporting companies formed outside the US remain obligated. A New Mexico LLC formed inside the US falls under the domestic exemption and has no BOI filing to submit. An LLC formed outside the US that registers to do business in a US state is a foreign reporting company and still files a BOI report at $150 per report through Anonymousllc.co. Owners uncertain of their status should confirm before assuming the exemption applies.
No recurring entity-level state tax. New Mexico charges no franchise tax and no annual report fee, so the only state tax exposure is income tax on New-Mexico-sourced income at up to 5.9%. This is a meaningful advantage over Delaware, which charges a $300 flat annual franchise tax, and over states with annual list or license fees. A New Mexico LLC with no New-Mexico-sourced income owes the state nothing on a recurring basis. The only ongoing cost is the $100/year registered agent renewal, which is a service fee rather than a state tax.
Yes. A New Mexico LLC can elect C-corporation treatment by filing IRS Form 8832, which taxes the company as a separate entity at the corporate rate. This suits founders who want to retain earnings in the business or raise outside investment. The trade-off is two layers of tax: the corporation pays tax on profit, and shareholders pay tax again on dividends. Most small LLCs stay with pass-through or elect S-corp status instead, because C-corp double taxation rarely helps a single owner. The C-corp election makes sense for companies reinvesting profit or courting venture capital, where the corporate structure matters more than the extra tax layer.
A single-member New Mexico LLC files Schedule C with the owner's personal 1040; a multi-member LLC files Form 1065 and issues K-1s. A foreign-owned single-member LLC also files Form 5472 with a pro-forma 1120 each year. The filing set depends on ownership and any tax election. An S-corp election adds Form 1120-S and payroll returns; a C-corp election adds Form 1120. Non-resident owners face the strictest requirement, since the Form 5472 filing carries a $25,000 penalty if missed. Anonymousllc.co's partner tax preparers match the correct return set to each owner's structure and residency.
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