Finance

In a Pennsylvania adjustable-rate mortgage (ARM), what is the 'index' and how does it affect the interest rate?

AThe index is a fixed margin set by the lender added to the borrower's credit score
BThe index is a benchmark interest rate (SOFR, Treasury) to which the lender's margin is added to determine the ARM rate✓ Correct
CThe index is the PA Realty Transfer Tax rate used to calculate closing costs
DThe index is the ratio of the loan amount to the appraised value

Explanation

An ARM's interest rate is calculated by adding the lender's fixed margin to a variable index rate (such as SOFR, one-year Treasury, or LIBOR's successor). When the index rises, the borrower's rate increases at the next adjustment; when the index falls, the rate decreases.

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