New Mexico Fiduciary Income Tax Return — FID-1 Filing Guide for Executors

Most executors expect to deal with the decedent's final personal tax return. What they do not expect is that the estate itself becomes a separate tax entity the moment probate opens — and New Mexico requires its own state-level fiduciary income tax filing on top of the federal one. If the estate earns any income during the settlement period (interest on bank accounts, rent from property, dividends from investments), the executor must file a FID-1 New Mexico Fiduciary Income Tax Return with the Taxation and Revenue Department.

When the FID-1 Is Required

An estate becomes a taxable entity when income-producing assets continue generating revenue after the date of death. Common triggers include:

• Interest accruing in bank accounts or CDs held in the estate's name
• Rental income from real property managed during the settlement period
• Dividends and capital gains from investment accounts that have not been distributed to beneficiaries
• Business income from a sole proprietorship or LLC owned by the decedent

New Mexico taxes this estate income at the same graduated personal income tax rates that apply to individuals — ranging from 1.7% to 5.9%. The FID-1 is due on the 15th day of the fourth month after the close of the estate's tax year. For most estates using a calendar year, that deadline is April 15.

The FID-1 is entirely separate from any estate tax obligation. New Mexico imposes no state-level estate or inheritance tax for the vast majority of residents. The FID-1 applies to income earned by the estate as an entity, not to the value of the estate itself.

Step-by-Step: Filing the FID-1

1. Obtain an EIN. Before filing anything, the estate needs its own federal Employer Identification Number from the IRS. This is free and can be obtained online at irs.gov. The EIN identifies the estate as a separate taxpayer — you cannot use the decedent's Social Security number for estate income.

2. File the federal Form 1041. The IRS requires a U.S. Income Tax Return for Estates and Trusts (Form 1041) for any estate with gross income of $600 or more during the tax year. The FID-1 largely mirrors the federal return, so completing the 1041 first simplifies the state filing.

3. Complete the FID-1. The New Mexico FID-1 reports the estate's income, deductions, and distributions to beneficiaries. Income distributed to beneficiaries is deducted from the estate's return — the beneficiaries then report it on their personal New Mexico PIT-1 returns. Only income retained by the estate is taxed at the estate level.

4. File with the Taxation and Revenue Department. The FID-1 can be filed electronically through the state's Taxpayer Access Point (TAP) system or mailed to the TRD. Electronic filing is faster and provides confirmation of receipt.

Closing Business Tax Accounts

If the decedent owned a business — whether a restaurant, consulting practice, or retail shop — the executor faces additional obligations with the TRD that many overlook until penalties start accumulating.

New Mexico's Gross Receipts Tax (GRT) is the state's equivalent of a sales tax, and active GRT accounts continue to generate filing obligations every month even if the business has ceased operations. If the executor does not formally close these accounts, the TRD will assess non-filing penalties against the estate.

To close business tax accounts:

1. Log into the Taxpayer Access Point (TAP) using the business's existing credentials, or contact the TRD to request access as the estate's personal representative
2. File all outstanding GRT returns through the final month of business activity
3. Submit Form ACD-31015 to formally close the GRT account
4. Request a Tax Clearance Certificate by filing Form ACD-31096 — this generates a Certificate of No Tax Due, which proves to heirs or potential buyers of the business that no hidden state tax liabilities exist

The Tax Clearance Certificate is not technically required by statute for estate closure, but it provides critical protection. Without it, heirs who inherit the business (or buyers who purchase it from the estate) could face surprise assessments for the decedent's unpaid taxes.

The Decedent's Final Personal Return

Separate from the estate's FID-1, the executor must also file the decedent's final personal income tax return — a New Mexico PIT-1 covering the period from January 1 through the date of death. This return reports the decedent's personal wages, investment income, and deductions for their final partial year.

If the decedent was married, the surviving spouse may elect to file a joint return for the year of death, which often produces a lower total tax liability than filing separately.

Common Mistakes That Trigger Penalties

Missing the EIN step. Filing the FID-1 under the decedent's SSN rather than the estate's EIN creates processing errors and potential IRS correspondence.

Ignoring small amounts of income. Even $50 in bank interest triggers the obligation if the estate's total gross income crosses the $600 federal threshold. Many executors assume small estates are exempt — they are not.

Leaving GRT accounts open. The most expensive mistake. Monthly non-filing penalties compound quickly, and the TRD can place liens on estate assets for unpaid GRT obligations.

Distributing all assets before filing. If the executor distributes every dollar to beneficiaries without retaining funds for the estate's tax obligations, the executor becomes personally liable for the unpaid taxes under fiduciary duty rules.

The New Mexico Estate Settlement Guide includes the complete tax filing timeline alongside every other statutory deadline executors face — from the first 48 hours through final estate closure.

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