Publication 502
taxmap/pubs/p502-001.htm#en_us_publink1000178852You can include only the medical and dental expenses you paid
this year, regardless of when the services were provided. (But see
Decedent
under
Whose Medical Expenses Can You Include, for an exception.) If you pay medical expenses by check, the
day you mail or deliver the check generally is the date of payment. If you use a
"pay-by-phone" or "online" account to pay your medical expenses, the date
reported on the statement of the financial institution showing when payment was
made is the date of payment. If you use a credit card, include medical expenses
you charge to your credit card in the year the charge is made, not when you
actually pay the amount charged.
If you did not claim a medical or dental expense that would have been deductible
in an earlier year, you can file Form 1040X, Amended U.S. Individual Income Tax
Return, for the year in which you overlooked the expense. Do not claim the
expense on this year's return. Generally, an amended return must be filed within
3 years from the date the original return was filed or within 2 years from the
time the tax was paid, whichever is later.
You cannot include medical expenses that were paid by insurance
companies or other sources. This is true whether the payments were made directly
to you, to the patient, or to the provider of the medical services.
taxmap/pubs/p502-001.htm#en_us_publink1000178854If you and your spouse live in a noncommunity property state
and file separate returns, each of you can include only the medical expenses
each actually paid. Any medical expenses paid out of a joint checking account in
which you and your spouse have the same interest are considered to have been
paid equally by each of you, unless you can show otherwise.
taxmap/pubs/p502-001.htm#en_us_publink1000178855If you and your spouse live in a community property state and
file separate returns, any medical expenses paid out of community funds are
divided equally. Each of you should include half the expenses. If medical
expenses are paid out of the separate funds of one spouse, only the spouse who
paid the medical expenses can include them. If you live in a community property
state, are married, and file a separate return, see Publication 555, Community
Property.