To execute an advance directive, you fill out the form completely, sign it while you still have decision-making capacity, have it witnessed (and often notarized) under your state’s specific rules, and then get copies into the hands of the people who will need them. The signing itself is short. The requirements around who can witness, how many witnesses you need, and whether a notary has to be involved are where directives most often fail, and a directive that fails on execution is treated as if you never signed anything at all.
Who Can Sign
You need to be a legal adult (18 or an emancipated minor) and have the mental capacity to understand what you’re signing at the moment you sign. Capacity here is a point-in-time assessment, not a verdict on your overall cognitive health. It comes down to four things: understanding the information in front of you, appreciating how it applies to your own situation, reasoning through the options and their consequences, and communicating a choice.1National Center for Biotechnology Information. Advance Directives – StatPearls
An early dementia diagnosis does not automatically disqualify someone. If you can meet those four capacities when you sit down to sign, the document is valid. Waiting is the risk. Once a condition progresses past the capacity standard, the ability to create a directive is gone.
You also need to be acting voluntarily. A directive signed under pressure from a family member or caregiver can be challenged later, which is part of why the witnessing rules exist.
Know What You’re Signing Before You Sign
Most advance directives bundle two instruments into one document, and the signing is for both.
A living will states your specific treatment preferences, such as whether you want mechanical ventilation, CPR, or artificial nutrition under defined circumstances. It generally takes effect only after physicians determine you are terminally ill, permanently unconscious, or otherwise unable to decide for yourself.1National Center for Biotechnology Information. Advance Directives – StatPearls
A healthcare power of attorney (also called a healthcare proxy or medical power of attorney) names a specific person to make medical decisions for you when you cannot communicate your own. Unlike a living will, it gives that person flexibility to respond to situations you never anticipated.2National Institute on Aging. Choosing A Health Care Proxy
One boundary worth clearing up before you sign: a POLST (Portable Medical Orders for Life-Sustaining Treatment) is not an advance directive. It is a medical order signed by a physician, nurse practitioner, or physician assistant for people already seriously ill or medically frail. Emergency responders can follow a POLST in the field but generally cannot honor a standard advance directive at the scene. If you are planning ahead while healthy, an advance directive is the right document. If you have a serious ongoing illness, ask your doctor whether a POLST should sit alongside it.
Choosing Your Proxy and a Backup
The proxy decision is part of execution because the name goes on the form you are about to sign. Your agent’s authority can include choosing providers, continuing or withdrawing treatment, accessing your medical records, and making decisions about organ donation and end-of-life care.2National Institute on Aging. Choosing A Health Care Proxy
Pick someone who will follow your wishes under family pressure rather than substitute their own judgment. You can restrict your proxy’s authority in the document itself, limiting them to certain decisions or requiring them to consult specific family members first, though some flexibility is wise because the whole point of a proxy is handling the unexpected.
Name at least one successor agent in the same document. If your primary proxy is unavailable, unable to serve, or dies before you, a successor steps in automatically. Without one, your family may have to pursue a court-appointed guardianship to get someone authorized to decide, which is expensive and slow. Adding a successor costs nothing when the document is drafted.
Witness Requirements and Who’s Disqualified
Witnessing rules vary by state, and this is the single area most likely to trip up an otherwise careful signer. The common principle across states is preventing conflicts of interest.
The Uniform Health-Care Decisions Act, which many states have adopted or adapted, requires at least one adult witness for a healthcare power of attorney. Under the Act, that witness cannot be the agent you appointed, the agent’s spouse or cohabitant, or an owner, operator, employee, or contractor of a nursing home or residential care facility where you live or receive care.3North Carolina General Assembly. Uniform Health-Care Decisions Act (2023) Many states extend the exclusions further, barring relatives by blood or marriage and anyone who stands to inherit from your estate.
The number of required witnesses is the biggest state-to-state variable. Some states accept one witness. Others require two. A handful require both witnesses and notarization. Check your state’s official form or your state bar association’s guidance before signing. Using the wrong number of witnesses, or the wrong people, is the straightforward way to produce a directive that looks valid but isn’t.
The disqualification rules are intuitive once you see them. Someone who benefits financially from your death or controls your daily care has an inherent conflict, and even where your relationship with that person is healthy, their signature creates an opening for opposing family members or cautious providers to challenge the document.
Signing and Notarization
Execution follows a sequence. Complete every field on the form first. A partially filled directive that gets signed and then completed later invites disputes about unauthorized alterations, and witnesses should be looking at the final version rather than a draft with blanks. If something needs to change mid-signing, start fresh with a clean form.
You sign first, declaring the document reflects your wishes. Your witnesses then sign and print their names, confirming they observed your signature and that you appeared competent and voluntary. Everyone should ideally be in the same room.
Some states accept notarization in place of witnesses, some require it in addition, and some make it optional but recommended. A notary verifies your identity through government-issued ID and applies an official seal. Notary fees for acknowledgments are set by state law and typically run from $2 to $15 per signature, with a few states going up to $25 and some setting no maximum.4National Notary Association. 2026 Notary Fees By State Even where notarization is not required, having it done adds authentication that can prevent challenges.
Remote and Electronic Signing
The 2023 revision of the Uniform Health-Care Decisions Act allows witnesses to be present through electronic means, including real-time video and even audio-only connections where the witness personally knows the signer or can verify identity through authentication questions.3North Carolina General Assembly. Uniform Health-Care Decisions Act (2023) As of early 2025, 45 states and the District of Columbia have permanent laws permitting remote online notarization, though not all of them extend remote notarization to advance directives specifically.
Before signing remotely, confirm two things. Your state has to allow remote witnessing for advance directives, not just for other legal documents. And the technology has to meet your state’s requirements, which may include a specific notary platform with identity verification and session recording. Some states also restrict remote execution for people classified as vulnerable adults. A directive executed remotely in a state that does not authorize it carries no more weight than an unsigned page.
After You Sign: Storage and Distribution
A properly executed directive is useless if no one can find it in an emergency. Keep the original somewhere secure but immediately accessible. A safe deposit box no one can open on a weekend is a poor choice.
Distribute copies to your primary care physician, your healthcare proxy and any successor agents, close family members, and any hospital or facility where you receive regular care. Ask your doctor’s office to upload it to your electronic health record, and ask hospitals to scan it into theirs during a scheduled visit.
About a dozen states run electronic advance directive registries that let healthcare providers retrieve your document quickly. Where one exists, registering is worth the small effort.
A wallet card identifying you as someone with an advance directive, and listing your proxy’s name and phone number, helps first responders know where to look and who to call. The American Hospital Association publishes a template for this purpose.5American Hospital Association. Put It In Writing – Wallet Card
If You Spend Time in More Than One State
Most states have laws recognizing out-of-state advance directives if the document was valid where you signed it or if it meets the requirements of the state where you are now receiving care. The UHCDA codifies this, treating an out-of-state directive as valid if it complies with the law of the state specified in the document or the state where it was created.3North Carolina General Assembly. Uniform Health-Care Decisions Act (2023)
Interpretation is the practical hazard. A term like “life-sustaining treatment” might include feeding tubes in one state and exclude them in another. If you regularly split time between two states, consider executing a directive that complies with both or signing a separate directive in each.
Changing or Revoking the Directive
You can change or cancel the directive at any time while you still have capacity. Under the UHCDA framework, you can revoke all or part of the directive (other than the agent designation) at any time and in any manner that communicates your intent. Revoking the agent designation specifically requires either a signed writing or personally informing your supervising healthcare provider.3North Carolina General Assembly. Uniform Health-Care Decisions Act (2023)
To make changes, execute a new directive rather than trying to amend the old one. Amendments require the same signing formalities as the original, so starting over is not more work. A new directive supersedes an earlier one to the extent they conflict.
Communication is the step people miss. A revocation does not take practical effect until your proxy, your doctor, and any facility holding the directive know about it. Destroy old copies, distribute the new version to everyone who had the previous one, and confirm receipt.
One automatic revocation surprises some signers: in many states, divorce automatically revokes your former spouse’s designation as your proxy. If you want an ex-spouse to continue in that role after divorce, you have to execute a new directive naming them.
What It Costs
You can complete an advance directive for free using forms from your state’s department of health, state bar association, or hospital system. Many hospitals provide the forms and help you fill them out at no charge, since federal law requires them to inform you about your rights regarding advance directives.6Office of the Law Revision Counsel. 42 U.S. Code 1395cc – Agreements With Providers of Services
An attorney typically charges between $150 and $1,000, depending on location and complexity. Hiring one adds value when you have a blended family, significant assets, property in multiple states, or wishes that go beyond what a standard form accommodates. For a simple situation, a state-provided form completed carefully is legally identical to one drafted by a lawyer.
Notarization adds a small cost where required or desired, generally under $15 in most states. The total out-of-pocket cost for a self-prepared, notarized directive is rarely more than $25.