How Do a Last Will and Power of Attorney Work Together?

What are the types of powers of attorney?

While all powers of attorney serve the same function of giving someone else authority to act for you, there are several types.

• Durable power of attorney: Takes effect from the date it is executed and remains in effect whether you are competent or not. If you sign a durable power of attorney today, your attorney-in-fact can manage your bank account tomorrow without any further authorization.
• Springing power of attorney: Does not go into effect until a triggering event occurs, usually your incapacity. If you create a springing power of attorney today, your attorney-in-fact cannot access your financial affairs until you are unable to manage them yourself. Not all states offer this option, and generally, a physician's letter is necessary to activate this type.

Healthcare power of attorney

A healthcare power of attorney (also called a medical power of attorney) is a separate document that authorizes someone to make medical decisions on your behalf when you cannot communicate or are otherwise incapacitated. Unlike a financial POA, a healthcare POA agent can only make decisions related to your medical care, not your finances or property.

Your healthcare agent can consent to or refuse medical treatments, choose doctors and healthcare facilities, approve surgeries, and make decisions about medications and therapies. This authority becomes critical during emergencies, during scheduled surgeries when you'll be under anesthesia, or with progressive illnesses that may affect your ability to communicate.

Because your healthcare agent may face difficult decisions about your medical treatment, choose someone who understands your values and preferences regarding care. Having both a financial POA and a healthcare POA ensures that all aspects of your life are covered if you become unable to make decisions yourself.

Limited vs. general authority

You can pick and choose what authority your power of attorney will give to your attorney-in-fact. Some states have boxes you can check to grant specific types of authority. For example, a financial power of attorney might give your son the right to manage your financial affairs and pay bills, but not the right to sell your real estate.

What is the difference between a living will and a medical power of attorney?

A living will is different from both a last will and a power of attorney. While a last will directs what happens to your assets after death, a living will specifies your preferences for end-of-life medical treatment while you're still alive but unable to communicate. It typically addresses decisions like whether you want life-sustaining treatment, mechanical ventilation, tube feeding, or resuscitation efforts if you have a terminal condition or are in a permanent vegetative state.

A healthcare power of attorney, by contrast, gives your designated agent the flexibility to make a wide range of medical decisions based on circumstances that arise—situations you may not have anticipated when creating your documents. The living will provides specific instructions; the healthcare POA provides adaptability.

Most people benefit from having both documents. Your living will ensures your end-of-life wishes are documented and followed, while your healthcare POA covers the countless other medical decisions that may arise during an illness, accident, or surgery. Some states combine these two documents into a single form called an advance directive, but the functions remain distinct.

Keep in mind that a financial power of attorney, the type discussed earlier in this article, handles money and property matters only. It does not give your agent any authority over healthcare decisions, which is why a separate healthcare POA or living will may be necessary.

Do I need both a will and a power of attorney?

Yes—a power of attorney protects you during your lifetime if you become incapacitated, while a will directs how your assets will be distributed after your death. Together, they ensure your wishes are carried out both during your life and after.

It's important to understand that all powers of attorney automatically terminate the moment you die. Your attorney-in-fact has no legal authority to act on your behalf after your death—not even to pay funeral expenses or access bank accounts. This is precisely why a will is essential: The executor you name in your will takes over where the POA ends. After death, your executor guides your estate through probate and distributes your assets according to your wishes. Rather than competing for authority, these documents work in sequence to protect you at different stages.

What are the costs of creating a will and a power of attorney?

The cost of creating a will and a power of attorney varies based on how you choose to prepare them. Attorney-drafted documents typically cost $150 to $400 for a power of attorney and $300 to $1,000 or more for a will, depending on the complexity of your estate and your attorney's experience. Online legal services generally offer documents for $100 to $300 combined, while free DIY templates are available but may not include state-specific requirements.

Several factors affect the total cost: the complexity of your estate, whether you need separate financial and healthcare powers of attorney, your geographic location, and whether you require additional documents like a living will or a trust. Remember that notarization—required in most states for a valid POA—adds approximately $5 to $25 per document.

While DIY options are the most affordable, having an attorney review your documents helps ensure they meet your state's legal requirements and accurately reflect your wishes. Some legal aid organizations also offer free or reduced-cost estate planning services for individuals who qualify based on income. Investing in properly drafted documents now can prevent costly legal complications later.

Brette Sember, J.D., contributed to this article.