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              Researh Sevice





Limits on Business Interest Deductions Under

the Coronavirus Aid, Relief, and Economic

Security (CARES) Act



Updated June 1, 2020
Thin capitalization rules, broadly, limit the amount of debt that can generate deductible interest for the
purpose of calculating taxable income. Limits on the tax deduction for business interest restrictions have
been relaxed by the Coronavirus Aid, Relief, and Economic Security (CARES) Act (H.R. 748, as
amended) providing economic stimulus and relief for taxpayers due to the expected slowdown of the
economy because of the coronavirus pandemic. These restrictions, also referred to by their Internal
Revenue Code Section 163(j), were expanded by the 2017 tax revision, P.L. 115-97.


Changes in P.L. 115-97, Popularly Known as the Tax

Cuts and Jobs Act (TCJA)

Restrictions on net interest deductions were significantly tightened in the 2017 tax legislation. Taken as a
whole, the tax revision was a tax cut, although a number of provisions were enacted to limit certain
deductions, among them the restrictions on interest deductions.

Rules Prior to TCJA
Prior to the TCJA, the thin capitalization rules were narrowly focused and limited. They applied only to
corporations and only to interest paid to related parties. Their objective was largely to limit earnings
stripping by multinational corporations that located debt in the United States. Even so, the rules could be
viewed as relatively liberal. They applied only to firms whose debt to equity ratio exceeded 1.5 to 1.
Interest deductions were limited to 50% of earnings before interest, taxes, depreciation, amortization, and
depletion (EBITDA). Disallowed deductions could be carried forward for three years.
Proposals to further restrict the thin capitalization rules had been made for some time to address corporate
inversions, in which firms shifted their headquarters to a foreign country in order to reduce profits in the
United States, in some cases by earnings stripping through locating debt in the United States.

                                                             Congressional Research Service
                                                               https://crsreports.congress.gov
                                                                                  IN11287

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