Supported Decision-Making in New Mexico: The Guardianship Alternative Under SB 535

Guardianship strips an aging parent of their legal rights. For a parent with mild cognitive impairment who can still participate in decisions, that's an extreme response. New Mexico now offers a legal middle ground.

What SB 535 Changed

In April 2025, New Mexico enacted the Supported Decision-Making Act (SB 535), effective July 1, 2025. The law creates a voluntary, legally recognized framework that allows adults with cognitive impairment to retain their full legal capacity while getting structured support from trusted individuals.

This directly addresses a problem families have faced for years: the gap between a parent who's fully independent and one who needs a court-appointed guardian. SB 535 fills that gap without a courtroom.

How It Works

Under a supported decision-making agreement, your parent designates one or more supporters — typically adult children, trusted relatives, or close friends. The supporters are authorized to:

• Help gather and interpret information relevant to decisions
• Access medical and financial records on the parent's behalf
• Help the parent understand their options and their consequences
• Communicate the parent's decisions to third parties (doctors, banks, agencies)

Supporters are legally barred from making decisions on the parent's behalf. The parent retains all legal rights and is presumed to have capacity. The supporter assists the decision-making process — they do not replace the decision-maker.

Who This Is For

Supported decision-making is designed for parents who:

• Have early-stage Alzheimer's or mild cognitive impairment
• Can understand information when it's explained clearly but struggle to gather or process it independently
• Want to maintain control of their lives but acknowledge they need help
• Would resist or resent a power of attorney or guardianship

It's not appropriate for parents with moderate-to-severe dementia who can no longer meaningfully participate in decisions, even with support. Those situations require either a POA (if capacity still exists to sign one) or guardianship.

The Agreement

The supported decision-making agreement is:

• Voluntary — both the parent and the supporter must consent
• Written — documented in a formal agreement
• Revocable — the parent can terminate it at any time
• Specific — can be limited to certain types of decisions (medical, financial, housing)

The Act is administered and monitored by the New Mexico Developmental Disabilities Council, which provides education and oversight for the supported decision-making program.

How It Compares to Other Options

Using It as a Bridge

Many families use supported decision-making as a transitional step. A parent with early-stage cognitive decline starts with a supported decision-making agreement. While under this framework, they also execute a durable power of attorney and advance health-care directive — voluntary planning documents that require capacity to sign.

As cognition declines further, the POA and advance directive are already in place. The family transitions smoothly from supported decision-making to agent authority without ever needing court intervention.

This sequenced approach — supported decision-making first, then voluntary planning documents, with guardianship only as a last resort — is the least restrictive and most cost-effective path through a parent's cognitive decline.

The New Mexico Power of Attorney and Guardianship Kit covers all three layers of this framework, starting with the capacity assessment that determines which option fits your parent's current situation.

See more New Mexico guides →