Out-of-state accountants routinely get New Mexico wrong, because New Mexico’s gross receipts tax is not a sales tax. It just impersonates one at the cash register. It is a tax on the seller’s total receipts, it reaches services and licenses that most states never touch, and when the Taxation and Revenue Department audits a business, the exposure lands on the business itself, not on its customers. If a TRD audit letter has arrived, or you want to make sure the file is ready before one does, here is the field guide.
Why is gross receipts tax different from a sales tax?
Three structural differences drive nearly every audit issue. First, the legal incidence: GRT is imposed on the seller’s gross receipts from doing business in New Mexico. Passing it through to customers is customary and lawful, but the liability is yours, so an under-collection is your problem, not theirs. Second, the base: services are broadly taxable, consultants, contractors, therapists, designers, software developers, which startles businesses arriving from Texas or Arizona, where services largely escape tax. Third, the sourcing: since a 2021 overhaul, most receipts are sourced to the delivery location, with statewide rates that vary meaningfully by location. A Rio Rancho consultant serving Santa Fe and Las Cruces clients may owe three different combined rates in a single quarter, and getting the location code wrong is one of the most common audit adjustments in the state.
| Typical state sales tax | New Mexico gross receipts tax | |
|---|---|---|
| Who owes it | Customer; seller collects as agent | The seller, on its own receipts |
| Services | Mostly exempt | Broadly taxable |
| Exemption paperwork | Resale certificates | Nontaxable transaction certificates (NTTCs) and statutory deductions |
| Sourcing | Varies | Generally destination-based since July 2021 |
| Audit exposure | Uncollected tax from customers | Seller’s own liability, plus penalty and interest |
What triggers a TRD audit?
Mostly data. TRD cross-matches federal information, 1099s, Schedule C receipts, entity returns, against gross receipts reported on New Mexico returns, and a gap generates a letter. Industry projects are the second driver: construction contractors, professional services, cannabis, and businesses claiming large deductions get periodic sweeps. The third is the unhappy customer or former employee. Whatever the trigger, the audit typically opens with a records request covering three years (longer if returns weren’t filed), and the auditor’s working assumption is simple: all receipts are taxable unless the business proves a deduction or exemption applies. That burden allocation, receipts presumed taxable, taxpayer proves otherwise, is the single most important thing to understand about the process.
Got a TRD audit letter or assessment? The 60-day NTTC clock and the 90-day protest deadline are already running.
What is the 60-day NTTC rule, and why is it the audit’s biggest trap?
Many of GRT’s most valuable deductions, sales for resale, sales to manufacturers, certain services resold by the buyer, require the seller to hold a nontaxable transaction certificate from the buyer. The trap is timing: when TRD begins an audit, it issues a notice giving the taxpayer 60 days to produce the NTTCs supporting claimed deductions. Certificates obtained after that window generally cannot save the deduction, no matter how legitimate the underlying transaction was. Businesses lose six-figure assessments not because their sales were taxable, but because the paperwork chase started 61 days too late. The operational lesson: collect NTTCs at the time of sale, audit your certificate file annually, and treat the 60-day letter as a fire alarm, not correspondence.
What happens if you disagree with the assessment?
You have 90 days from the assessment to act, and two very different roads. The administrative road is a written protest, which freezes collection and routes the dispute to an informal conference and, if unresolved, a hearing before the independent Administrative Hearings Office, a forum where businesses genuinely win when the documentation is there. The judicial road is paying the assessment and suing for a refund. The protest is free and keeps your cash; the refund route sometimes fits better where interest exposure is large or a pure legal question is headed to the Court of Appeals anyway. Miss the 90-day window and the assessment becomes final, collection begins, and your options shrink to payment arrangements. Calendar the deadline the day the assessment arrives.
What is a managed audit, and when does it save real money?
A managed audit is a deal with TRD in which the taxpayer audits itself under a signed agreement, scope, periods, and methodology approved in advance, and reports the result. The prize is financial: liabilities disclosed through an approved managed audit are generally relieved of penalty and interest, which on a three-year exposure can be a quarter or more of the total bill. It fits businesses that already know something is wrong, a mis-sourced service line, an NTTC gap, an unregistered location, and want to fix it on their own timeline rather than an auditor’s. It is not amnesty: the tax itself is still due, and the agreement must come before TRD starts its own exam. That timing makes the managed audit a planning tool, not a rescue tool.
How do you keep deductions safe before anyone audits anything?
Four habits cover most of the risk. Match every claimed deduction to its statutory basis and its documentation, NTTC, government purchase order, out-of-state delivery proof, in a file you could hand an auditor tomorrow. Verify location codes and rates for every regular delivery destination once a year, because rates and codes change. Reconcile the federal return to the GRT returns annually, since that is precisely the match TRD’s computers run. And when the business model changes, new service line, new delivery footprint, first out-of-state customer, get the taxability answer in writing before the receipts start, not after the letter arrives.
Frequently Asked Questions
Can I just pass the gross receipts tax to my customers and forget about it?
You can pass it through, nearly everyone does, but the legal liability stays with your business. If you under-collect because of a rate error or a deduction that fails on audit, TRD assesses you, not your customers, and collecting it back from customers after the fact is rarely realistic.
Are services really taxable in New Mexico?
As a general rule, yes. Professional and personal services performed in or delivered into New Mexico are within the GRT base unless a specific deduction or exemption applies. This is the single biggest surprise for businesses relocating from states like Texas, where most services aren’t taxed.
What if I can’t get an NTTC from my customer during the 60-day window?
Act immediately, in writing, and involve a professional. Some deductions can be supported with alternative evidence, and in limited circumstances relief may exist for certificates that were applied for timely. But the safe answer is structural: collect certificates at the time of sale so the window never matters.
Is the Administrative Hearings Office really independent from TRD?
Yes. It’s a separate agency, deliberately placed outside the Taxation and Revenue Department, with hearing officers who rule against the Department regularly when the taxpayer’s documentation holds up. A well-prepared protest is a real remedy, not a rubber stamp.
How far back can TRD audit my business?
Generally three years from the end of the year the tax was due, extended to six or seven in cases of substantial underreporting or unfiled returns, and unlimited where no return was filed. Filing something, even imperfect, starts the clock, which is one more reason non-filers should come in from the cold deliberately.
How North Star Law Firm Can Help
North Star Law Firm represents New Mexico businesses through the full gross receipts tax lifecycle: audit defense, the 60-day NTTC scramble, protests before the Administrative Hearings Office, managed audit negotiations, and the structural cleanup that keeps the next audit boring. Phillip Zagotti, JD/CPA, pairs the accounting fluency GRT reconciliations demand with administrative tax controversy experience. The firm’s tax law practice handles GRT structuring and compliance design, and its tax defense practice takes over when an assessment is already on the table. If the audit letter has arrived, the 60-day and 90-day clocks are already running. Contact North Star Law Firm today.