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IRS.gov Website
Publication 502
taxmap/pubs/p502-003.htm#en_us_publink1000178858

Whose Medical Expenses  
Can You Include?(p3)

rule
You can generally include medical expenses you pay for yourself, as well as those you pay for someone who was your spouse or your dependent either when the services were provided or when you paid for them. There are different rules for decedents and for individuals who are the subject of multiple support agreements. See Support claimed under a multiple support agreement, later under Qualifying Relative.
taxmap/pubs/p502-003.htm#en_us_publink1000178862

Yourself(p3)

rule
You can include medical expenses that you paid for yourself.
taxmap/pubs/p502-003.htm#en_us_publink1000178863

Spouse(p3)

rule
You can include medical expenses you paid for your spouse. To include these expenses, you must have been married either at the time your spouse received the medical services or at the time you paid the medical expenses.
taxmap/pubs/p502-003.htm#en_us_publink1000178864

Example 1.(p3)

Mary received medical treatment before she married Bill. Bill paid for the treatment after they married. Bill can include these expenses in figuring his medical expense deduction even if Bill and Mary file separate returns.
If Mary had paid the expenses, Bill could not include Mary's expenses in his separate return. Mary would include the amounts she paid during the year in her separate return. If they filed a joint return, the medical expenses both paid during the year would be used to figure their medical expense deduction.
taxmap/pubs/p502-003.htm#en_us_publink1000178865

Example 2.(p3)

This year, John paid medical expenses for his wife Louise, who died last year. John married Belle this year and they file a joint return. Because John was married to Louise when she received the medical services, he can include those expenses in figuring his medical expense deduction for this year.
taxmap/pubs/p502-003.htm#en_us_publink1000178866

Dependent(p3)

rule
You can include medical expenses you paid for your dependent. For you to include these expenses, the person must have been your dependent either at the time the medical services were provided or at the time you paid the expenses. A person generally qualifies as your dependent for purposes of the medical expense deduction if both of the following requirements are met.
  1. The person was a qualifying child (defined later) or a qualifying relative (defined later), and
  2. The person was a U.S. citizen or national or a resident of the United States, Canada, or Mexico. If your qualifying child was adopted, see Exception for adopted child, below.
You can include medical expenses you paid for an individual that would have been your dependent except that:
  1. He or she received gross income of $3,650 or more in 2010,
  2. He or she filed a joint return for 2010, or
  3. You, or your spouse if filing jointly, could be claimed as a dependent on someone else's 2010 return.
taxmap/pubs/p502-003.htm#en_us_publink1000178868

Exception for adopted child.(p4)

rule
If you are a U.S. citizen or national and your adopted child lived with you as a member of your household for 2010, that child does not have to be a U.S. citizen or national, or a resident of the United States, Canada, or Mexico.
taxmap/pubs/p502-003.htm#en_us_publink1000178869

Qualifying Child(p4)

rule
A qualifying child is a child who:
  1. Is your son, daughter, stepchild, foster child, brother, sister, stepbrother, stepsister, half brother, half sister, or a descendant of any of them (for example, your grandchild, niece, or nephew),
  2. Was:
    1. Under age 19 at the end of 2010 and younger than you (or your spouse, if filing jointly),
    2. Under age 24 at the end of 2010, a full-time student, and younger than you (or your spouse, if filing jointly), or
    3. Any age and permanently and totally disabled,
  3. Lived with you for more than half of 2010,
  4. Did not provide over half of his or her own support for 2010, and
  5. Did not file a joint return, other than to claim a refund.
taxmap/pubs/p502-003.htm#en_us_publink1000178870

Adopted child.(p4)

rule
A legally adopted child is treated as your own child. This child includes a child lawfully placed with you for legal adoption.
You can include medical expenses that you paid for a child before adoption if the child qualified as your dependent when the medical services were provided or when the expenses were paid.
If you pay back an adoption agency or other persons for medical expenses they paid under an agreement with you, you are treated as having paid those expenses provided you clearly substantiate that the payment is directly attributable to the medical care of the child.
But if you pay the agency or other person for medical care that was provided and paid for before adoption negotiations began, you cannot include them as medical expenses.
Deposit
You may be able to take a credit for other expenses related to an adoption. See the Instructions for Form 8839, Qualified Adoption Expenses, for more information.
taxmap/pubs/p502-003.htm#en_us_publink1000178872

Child of divorced or separated parents.(p4)

rule
For purposes of the medical and dental expenses deduction, a child of divorced or separated parents can be treated as a dependent of both parents. Each parent can include the medical expenses he or she pays for the child, even if the other parent claims the child's dependency exemption, if:
  1. The child is in the custody of one or both parents for more than half the year,
  2. The child receives over half of his or her support during the year from his or her parents, and
  3. The child's parents:
    1. Are divorced or legally separated under a decree of divorce or separate maintenance,
    2. Are separated under a written separation agreement, or
    3. Live apart at all times during the last 6 months of the year.
This does not apply if the child's exemption is being claimed under a multiple support agreement (discussed later).
taxmap/pubs/p502-003.htm#en_us_publink1000178873

Qualifying Relative(p4)

rule
A qualifying relative is a person:
  1. Who is your:
    1. Son, daughter, stepchild, or foster child, or a descendant of any of them (for example, your grandchild),
    2. Brother or sister, half brother, half sister, or a son or daughter of any of them,
    3. Father or mother, or an ancestor or sibling of either of them (for example, your grandmother, grandfather, aunt, or uncle),
    4. Stepbrother, stepsister, stepfather, stepmother, son-in-law, daughter-in-law, father-in-law, mother-in-law, brother-in-law, or sister-in-law, or
    5. Any other person (other than your spouse) who lived with you all year as a member of your household if your relationship did not violate local law,
  2. Who was not a qualifying child (see Qualifying Child earlier) of any taxpayer for 2010, and
  3. For whom you provided over half of the support in 2010. But see Child of divorced or separated parents, earlier, Support claimed under a multiple support agreement, next, and Kidnapped child under Qualifying Relative in Publication 501, Exemptions, Standard Deduction, and Filing Information.
taxmap/pubs/p502-003.htm#en_us_publink1000178877

Support claimed under a multiple support agreement.(p5)

rule
If you are considered to have provided more than half of a qualifying relative's support under a multiple support agreement, you can include medical expenses you pay for that person. A multiple support agreement is used when two or more people provide more than half of a person's support, but no one alone provides more than half.
Any medical expenses paid by others who joined you in the agreement cannot be included as medical expenses by anyone. However, you can include the entire unreimbursed amount you paid for medical expenses.
taxmap/pubs/p502-003.htm#en_us_publink1000178879

Example.(p5)

You and your three brothers each provide one-fourth of your mother's total support. Under a multiple support agreement, you treat your mother as your dependent. You paid all of her medical expenses. Your brothers repaid you for three-fourths of these expenses. In figuring your medical expense deduction, you can include only one-fourth of your mother's medical expenses. Your brothers cannot include any part of the expenses. However, if you and your brothers share the nonmedical support items and you separately pay all of your mother's medical expenses, you can include the unreimbursed amount you paid for her medical expenses in your medical expenses.
taxmap/pubs/p502-003.htm#en_us_publink1000178880

Decedent(p5)

rule
Medical expenses paid before death by the decedent are included in figuring any deduction for medical and dental expenses on the decedent's final income tax return. This includes expenses for the decedent's spouse and dependents as well as for the decedent.
The survivor or personal representative of a decedent can choose to treat certain expenses paid by the decedent's estate for the decedent's medical care as paid by the decedent at the time the medical services were provided. The expenses must be paid within the 1-year period beginning with the day after the date of death. If you are the survivor or personal representative making this choice, you must attach a statement to the decedent's Form 1040 (or the decedent's amended return, Form 1040X) saying that the expenses have not been and will not be claimed on the estate tax return.
EIC
Qualified medical expenses paid before death by the decedent are not deductible if paid with a tax-free distribution from any Archer MSA, Medicare Advantage MSA, or health savings account.
taxmap/pubs/p502-003.htm#en_us_publink1000178882

What if the decedent's return had been filed and the medical expenses were not included?(p5)

rule
Form 1040X can be filed for the year or years the expenses are treated as paid, unless the period for filing an amended return for that year has passed. Generally, an amended return must be filed within 3 years of the date the original return was filed, or within 2 years from the time the tax was paid, whichever date is later.
taxmap/pubs/p502-003.htm#en_us_publink1000178883

Example.(p5)

John properly filed his 2009 income tax return. He died in 2010 with unpaid medical expenses of $1,500 from 2009 and $1,800 in 2010. If the expenses are paid within the 1-year period, his survivor or personal representative can file an amended return for 2009 claiming a deduction based on the $1,500 medical expenses. The $1,800 of medical expenses from 2010 can be included on the decedent's final return for 2010.
taxmap/pubs/p502-003.htm#en_us_publink1000178884

What if you pay medical expenses of a deceased spouse or dependent?(p5)

rule
If you paid medical expenses for your deceased spouse or dependent, include them as medical expenses on your Form 1040 in the year paid, whether they are paid before or after the decedent's death. The expenses can be included if the person was your spouse or dependent either at the time the medical services were provided or at the time you paid the expenses.