Concerns that borrowers could default en masse on home equity lines of credit are overblown, according to a report released Thursday by the credit bureau TransUnion.

Though some borrowers will suffer from payment shock when home equity lines reach their end-of-draw-period after 10 years, the risks are isolated, TransUnion found. Fewer than 20% of home equity lines have an "elevated risk" of default in the next few years.

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