BENEFIT PLANS	12 Months Ended
Dec. 31, 2019
Retirement Benefits [Abstract]
BENEFIT PLANS	BENEFIT PLANS IAC has a retirement savings plan in the United States that qualifies under Section 401(k) of the Internal Revenue Code. Under the IAC/InterActiveCorp Retirement Savings Plan ("the Plan"), participating employees may contribute up to 50% of their pre-tax earnings, but not more than statutory limits. Prior to July 2019, IAC contributed a dollar for each dollar a participant contributed in this plan, with a maximum contribution of 3% of a participant's eligible earnings. In June 2019, the Company approved a change to its matching contribution to 100% of the first 10% of compensation, subject to IRS limits on the Company's matching contribution, that a participant contributes to the Plan. This change is being phased in beginning July 1, 2019 and will be fully implemented by all IAC subsidiaries participating in the Plan no later than January 1, 2020. Matching contributions for the Plan for the years ended December 31, 2019, 2018 and 2017 are $21.0 million, $12.9 million and $11.1 million, respectively. Matching contributions are invested in the same manner as each participant's voluntary contributions in the investment options provided under the Plan. An investment option in the Plan is IAC common stock, but neither participant nor matching contributions are required to be invested in IAC common stock. The increase in matching contributions in 2019 is due primarily to the aforementioned change to the Company's matching contribution. The increase in matching contributions in 2018 is due primarily to an increase in participation in the Plan due to increases in headcount from the Combination and continued corporate growth at ANGI, MTCH, Vimeo and Dotdash. IAC also has or participates in various benefit plans, principally defined contribution plans, for its international employees. IAC's contributions for these plans for the years ended December 31, 2019, 2018 and 2017 are $4.0 million, $3.4 million and $2.5 million, respectively.

BENEFIT PLANS

12 Months Ended

Dec. 31, 2019

IAC has a retirement savings plan in the United States that qualifies under Section 401(k) of the Internal Revenue Code. Under the IAC/InterActiveCorp Retirement Savings Plan ("the Plan"), participating employees may contribute up to 50% of their pre-tax earnings, but not more than statutory limits. Prior to July 2019, IAC contributed a dollar for each dollar a participant contributed in this plan, with a maximum contribution of 3% of a participant's eligible earnings. In June 2019, the Company approved a change to its matching contribution to 100% of the first 10% of compensation, subject to IRS limits on the Company's matching contribution, that a participant contributes to the Plan. This change is being phased in beginning July 1, 2019 and will be fully implemented by all IAC subsidiaries participating in the Plan no later than January 1, 2020. Matching contributions for the Plan for the years ended December 31, 2019, 2018 and 2017 are $21.0 million, $12.9 million and $11.1 million, respectively. Matching contributions are invested in the same manner as each participant's voluntary contributions in the investment options provided under the Plan. An investment option in the Plan is IAC common stock, but neither participant nor matching contributions are required to be invested in IAC common stock. The increase in matching contributions in 2019 is due primarily to the aforementioned change to the Company's matching contribution. The increase in matching contributions in 2018 is due primarily to an increase in participation in the Plan due to increases in headcount from the Combination and continued corporate growth at ANGI, MTCH, Vimeo and Dotdash.

IAC also has or participates in various benefit plans, principally defined contribution plans, for its international employees. IAC's contributions for these plans for the years ended December 31, 2019, 2018 and 2017 are $4.0 million, $3.4 million and $2.5 million, respectively.