Montana transgender laws sit in an unusually unsettled place: the legislature passed a wave of restrictions between 2021 and 2025 covering healthcare, identity documents, sports, and public facilities, and Montana courts have blocked or struck down most of them. What you can and cannot do as a transgender person in Montana depends on which specific issue you’re facing, and in several areas the answer has changed within the past year.
Gender-Affirming Care for Minors
Senate Bill 99, passed in 2023, banned surgeries related to gender transition for anyone under 18 and prohibited puberty blockers and cross-sex hormones prescribed to alter a minor’s biological sex. It carved out exceptions for minors with medically verifiable disorders of sexual development. Providers who violated it faced a minimum one-year license suspension and could be sued for damages.
SB 99 never took full effect. In December 2024, the Montana Supreme Court upheld a preliminary injunction, finding the law likely violated the right to individual privacy under Article II, Section 10 of the Montana Constitution.1Justia Law. Cross v. State – 2024 Montana Supreme Court Decisions On May 13, 2025, the Missoula County District Court permanently struck the law down. Judge Jason Marks found it discriminatory because it banned treatments for transgender minors while permitting the same medical interventions for cisgender children, and concluded the state’s interest was “political and ideological” rather than medical. As of early 2026, the state has not announced whether it will appeal.
How Montana Defines Sex
Senate Bill 458, also passed in 2023, tried to define “sex” throughout Montana law as strictly male or female based on biological and genetic indicators at birth. That definition would have flowed into anti-discrimination statutes, vital records rules, and other legal frameworks.2Montana Department of Public Health and Human Services. DPHHS Officials State 2022 Administrative Rule Governs Sex Marker Birth Certificate Change Requests
A Montana district court struck down SB 458 in February 2025, finding its rigid two-sex definition excluded transgender, intersex, and Two Spirit individuals from the legal definition of “human beings” and stripped them of existing anti-discrimination protections. The court also held the law interfered with the doctor-patient relationship and violated the state constitutional right to privacy. The definition of sex under Montana law remains unsettled while litigation continues, which affects several of the other areas below.
Changing the Sex Marker on a Birth Certificate
Birth certificates are handled by the Department of Public Health and Human Services, and this is the most tangled area of Montana law right now. Senate Bill 280, passed in 2021, required a court order confirming that a person’s sex “has been changed by surgical procedure” before DPHHS could amend the certificate. In June 2023, a district court permanently blocked SB 280 in Marquez v. State of Montana, ruling it unconstitutionally vague. That injunction remains in effect as of April 2026.
Despite the injunction, DPHHS issued guidance in February 2024 stating that a 2022 administrative rule controls the process. Under that rule, the sex listed on a birth certificate can only be “corrected” if it was recorded incorrectly due to a scrivener’s error, a data entry error, or if the sex was “misidentified” on the original certificate. DPHHS requires a correction affidavit and supporting documents.2Montana Department of Public Health and Human Services. DPHHS Officials State 2022 Administrative Rule Governs Sex Marker Birth Certificate Change Requests
The fee for correcting a birth certificate after the first year of life is $41: $25 for processing and $16 for a certified copy.3Montana Department of Public Health and Human Services. Corrections to Certificates Because the court rulings against SB 280 and SB 458 may conflict with the DPHHS administrative interpretation, expect complications and consider legal help before you file.
Driver’s License and State ID
The Montana Motor Vehicle Division has historically accepted a Gender Designation Change Form signed by a licensed healthcare provider. With SB 458’s binary definition of sex struck down in early 2025, the specific requirements may be in transition. Contact the Motor Vehicle Division directly to confirm current procedures, documentation, and fees before applying.
Legal Name Change
Name changes are stable ground compared to the rest of Montana law here. Adults file a petition in the district court of the county where they live. The petition must include your place of birth, current residence, present name, proposed name, and reason for the change. If neither parent is living, you must also list your known close relatives and their addresses.4Montana State Legislature. Montana Code 27-31-101 – Petition for Change of Name of Natural Person
The filing fee is $120, the standard civil commencement fee for Montana district courts.5Montana Judicial Branch. Fee Schedule-Civil Montana Clerks of District Courts If you can’t afford it, ask the clerk of court for an affidavit of inability to pay, which requests a fee waiver.6Montana Judicial Branch. Changing Your Name as an Adult
After filing, publish notice of the hearing. If a newspaper is published in your county, the notice runs there for four successive weeks. If no newspaper exists in your county, post the notice in at least three public places for the same period.7Montana Code Annotated. Montana Code 27-31-201 – Order Setting Hearing Date, Notice, Safety At the hearing, the judge confirms publication was completed and may ask a few questions. If everything checks out, the court issues a Decree of Name Change, which you use to update other documents. Courts may also request a criminal background check. Standardized forms are available through the Montana Judicial Branch.8Montana Judicial Branch. Name Change
School Sports
The Save Women’s Sports Act (House Bill 112, 2021) requires public school sports teams to be designated by sex rather than gender identity. The Montana Supreme Court narrowed the law in Barrett v. State of Montana, holding it cannot apply to higher education institutions. HB 112 remains in effect for public elementary, middle, and high schools, so transgender students at those levels cannot participate on teams matching their gender identity if it differs from their sex assigned at birth.
Restrooms and Public Facilities
House Bill 121, passed in 2025, restricts access to public restrooms, changing rooms, and sleeping spaces based on sex assigned at birth. It applies broadly to public facilities and entities receiving public funding, including schools, libraries, hospitals, university buildings, correctional centers, juvenile detention facilities, domestic violence programs, and leased public spaces. Covered entities are required to take “reasonable steps” to keep members of the opposite sex out of sex-designated areas.
In May 2025, a Missoula District Court judge issued a preliminary injunction blocking HB 121 from being enforced. The 51-page ruling found enough constitutional concerns to pause the law while the case proceeds. Whether the injunction holds through trial or appeal is still open.
Discrimination in Employment, Housing, and Public Accommodations
The Montana Human Rights Act prohibits discrimination in employment, housing, and public accommodations based on sex, along with race, religion, age, disability, and marital status.9Montana State Legislature. Montana Code 49-2-303 – Discrimination in Employment The statute doesn’t list gender identity as a separate protected class. However, the state’s Human Rights Bureau has stated it accepts and analyzes complaints of sex discrimination “to include discrimination or harassment based on sexual orientation, gender identity, as well as caregiver status.”10Montana Department of Labor and Industry. Sex Discrimination and Sexual Harassment
That interpretation aligns with the U.S. Supreme Court’s 2020 decision in Bostock v. Clayton County, which held that firing an employee for being transgender is sex discrimination under federal Title VII.11Supreme Court of the United States. Bostock v. Clayton County, Georgia In practice, a transgender person in Montana facing discrimination at work, in housing, or in a public business can file with the Human Rights Bureau and have the complaint investigated under the sex-discrimination umbrella. If SB 458 or a similar statute were reinstated on appeal, that scope could narrow.
Public school and college students facing sex-based discrimination also have a federal route through Title IX, which covers most schools and colleges in Montana. Complaints go to the U.S. Department of Education’s Office for Civil Rights.12U.S. Department of Education. Title IX and Sex Discrimination
Federal Identity Documents
Two federal changes affect Montanans along with everyone else in the country.
Passports
A January 20, 2025 executive order directed the State Department to require that passports reflect the holder’s “sex assigned at birth” and to recognize only male and female, eliminating the “X” marker. A federal district court initially blocked the policy, but in late 2025 the U.S. Supreme Court stayed that order, finding the administration likely to succeed on the merits. As of early 2026, the executive order’s policy is in effect and obtaining a passport with a gender marker different from sex assigned at birth is not available through normal channels.
Social Security
On January 31, 2025, the Social Security Administration issued guidance prohibiting changes to the sex designation on Social Security records. Before that date, individuals could update their sex marker on Form SS-5. That option is no longer available. Name changes are still permitted with a completed SS-5, proof of identity, and legal documentation such as a court order. On the form, select the sex that matches your current Social Security record.
Federal Tax Deduction for Gender-Affirming Care
Gender-affirming medical expenses may be deductible on your federal return. The IRS has recognized hormone therapy and surgical procedures related to gender transition as medically necessary, making them eligible medical expenses. As with all medical deductions, you can only write off the portion of total medical costs that exceeds 7.5% of your adjusted gross income.13Internal Revenue Service. Publication 502 – Medical and Dental Expenses
Keep records from your healthcare providers confirming each treatment was medically appropriate. Procedures like breast augmentation or chest reconstruction qualify only when a provider documents them as medically indicated rather than purely cosmetic. Eligible expenses can also be paid through a flexible spending account if your employer’s plan covers them, subject to the plan’s contribution limits and documentation rules. IRS Publication 502 has the full list of what qualifies.