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The Mortgage Interest Deduction


May 7, 2020


The mortgage interest deduction is of interest to
policymakers due to its association with homeownership.
The mortgage interest deduction is also of interest because
it is one of the largest tax benefits available to homeowners
in terms of forgone federal tax revenue. For 2020, the Joint
Committee on Taxation (JCT) estimates that the deduction
will reduce revenues by $30.2 billion. The only larger
housing-related tax expenditure is the exclusion for capital
gains on the sale of a principal residence at a revenue cost
of $35.9 billion in 2020. This In Focus provides a brief
overview of the mortgage interest deduction.

P.L. 115-97, often referred to as the Tax Cuts and Jobs Act
(TCJA), changed the tax treatment of mortgage interest
starting in tax year 2018. Although the mortgage interest
deduction is still generally available, TCJA reduced the
maximum mortgage balance eligible for the deduction and
restricted the deduction of interest associated with home
equity loans. TCJA also increased the standard deduction,
which reduced the number of taxpayers who claim itemized
deductions generally, including for mortgage interest.

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A taxpayer may claim an itemized deduction for qualified
residence interest, which includes interest paid on a
mortgage secured by a principal residence and a second
residence. The amount of interest that is deductible depends
on when the mortgage debt was incurred. For mortgage
debt incurred on or before December 15, 2017, the
combined mortgage limit is $1 million ($500,000 for
married filing separately). For mortgage debt incurred after
December 15, 2017, the deduction is limited to the interest
incurred on the first $750,000 ($375,000 for married filing
separately) of combined mortgage debt.

If a taxpayer has mortgage debt exceeding the applicable
mortgage limit ($750,000 or $1 million), he or she may still
claim a deduction for a percentage of interest paid equal to
the applicable mortgage limit divided by the remaining
mortgage balance. For example, a homeowner whose
mortgage was originated after December 15, 2017, and has
a balance of $1 million could deduct 75% ($750,000
divided by $1 million) of the interest payments.

Refinanced mortgage debt is treated as having been
incurred on the origination date of the original mortgage for
purposes of determining which mortgage limit applies
($750,000 or $1 million). The balance of the new loan
resulting from the refinance, however, may not exceed the
balance of the original loan. This may occur, for example,
when a homeowner cashes out equity in the home by
obtaining a larger loan than is necessary to pay off the
current mortgage balance.


For purposes of the deduction, mortgage debt includes
home equity loans secured by a principal or second
residence that are used to buy, build, or substantially
improve a taxpayer's home. Mortgage debt does not include
home equity loans when the proceeds are used for purposes
unrelated to the property securing the loan. For example,
interest associated with a home equity loan that is used to
pay off a credit card balance, go on a vacation, or send a
child to college does not qualify for the mortgage interest
deduction. The restrictions on the use of home equity loans
apply irrespective of when the loan was originated.

After 2025, the mortgage interest deduction will revert to
the law that existed prior to TCJA.

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Under prior law, a homeowner was allowed an itemized
deduction for the interest paid on the first $1 million of
combined mortgage debt associated with a primary or
secondary residence. As with current law, a homeowner
could deduct a percentage of interest paid if the mortgage
balance exceeded the $1 million limit. Additionally, a
homeowner was allowed to deduct the interest on the first
$100,000 of home equity debt regardless of whether or not
the taxpayer incurred the debt to finance costs associated
with the home. For example, under prior law, a homeowner
could use a home equity loan to purchase a boat, pay for a
child's college, cover medical costs, or any number of other
things not involving the property that secured the loan and
still deduct the associated interest.


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The reduced mortgage limits under TCJA decrease the
amount of interest that would otherwise be deducted under
prior law, though the reduction itselfwill likely not have a
significant impact on the number of homeowners claiming
the deduction. However, other changes enacted by TCJA,
specifically the near doubling of the standard deduction and
the $10,000 limit placed on the deduction for state and local
income taxes (SALT), are estimated to have reduced the
itemization rate generally, and will therefore reduce the
number of homeowners claiming the mortgage interest
deduction. Shortly after enactment, the Tax Policy Center
estimated that TCJA would reduce the overall itemization
rate from 26.4% of taxpayers to 10.9%. Because taxpayers
must itemize to claim the mortgage interest deduction,
fewer homeowners now benefit from the deduction.

The lower itemization rate and the fact that higher-income
homeowners have larger mortgage balances on average
means that the benefits of the mortgage interest deduction
disproportionately accrue to taxpayers at the upper end of


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