Interest Only

Interest only describes a loan structure or payment arrangement in which the borrower is required to pay only the interest accruing on the loan during a defined period, without making any payments toward reducing the principal balance itself. Once the interest-only period ends, the loan typically converts to a standard amortizing repayment structure, with the remaining principal repaid over the loan's remaining term, resulting in meaningfully higher monthly payments from that point forward than were required during the interest-only phase.

Interest-only structures are used across several types of lending, including some mortgages, business loans, and certain lines of credit, each with its own typical interest-only period length and resulting payment structure once that period ends.

An interest-only loan is like renting the use of borrowed money without yet paying any of it back: the borrower keeps the full original loan amount outstanding throughout the interest-only period, paying only the ongoing cost of having access to that money, with the actual debt itself remaining exactly where it started until the interest-only period finally ends and real repayment of principal begins.

• Lower monthly payments during the interest-only period, freeing up cash flow for other purposes such as investing, business expansion, or covering a temporary income gap.
• Expected future income growth or an anticipated lump sum, such as a bonus or the sale of another asset, intended to pay down or pay off the principal once it becomes due.
• Investment property financing, where some investors prefer to minimize current cash outflow and rely on eventual property appreciation or sale to address the principal.

Because no principal is being repaid during the interest-only period, the borrower builds no equity in the underlying asset from loan repayment alone during that time, and faces a significant, predictable jump in required payments once the interest-only period ends and full amortization begins. If property or asset values decline during the interest-only period, or if the borrower's anticipated future income or lump sum does not materialize as expected, the transition to full repayment can create serious financial strain, a risk that became particularly visible during the housing downturn following the 2008 financial crisis.

A fully amortizing loan steadily reduces the principal balance from the very first payment, building equity throughout the loan's term, while an interest-only loan defers that principal reduction entirely until a later point, trading lower initial payments for a larger repayment burden concentrated later in, or at the end of, the loan's life.

Lenders offering interest-only products increasingly require proof that a borrower has a credible plan for handling the later jump in payments, rather than simply qualifying borrowers based on the lower interest-only payment alone.

Some commercial real estate loans are structured as interest-only for their entire term, with the full principal due as a single balloon payment at maturity, reflecting an expectation that the property will be refinanced or sold before that date rather than paid down through ordinary amortization. Residential interest-only loans, by contrast, almost always convert to a fully amortizing structure at some point before maturity, since regulators have grown considerably more cautious about residential loans that never require any principal repayment at all.

Some borrowers use the lower payments during an interest-only period deliberately, investing the resulting cash-flow savings elsewhere, on the expectation that those investments will outperform the cost of eventually repaying the principal, a strategy that carries its own risk if the investments underperform or the principal repayment deadline arrives before expected.

Lenders typically price interest-only loans with a somewhat higher rate than an equivalent fully amortizing loan, reflecting the additional risk that comes with deferring principal repayment, meaning the lower initial payment does not necessarily reflect a genuinely cheaper loan overall.

A borrower nearing the end of an interest-only period should proactively contact their lender well in advance to confirm exactly what the new, fully amortizing payment will look like, since discovering the new amount only after it takes effect leaves far less time to adjust a household budget accordingly.

Some borrowers deliberately choose a shorter interest-only period specifically to reduce the eventual payment shock, accepting a smaller upfront savings in exchange for a less dramatic jump once full amortization begins, a compromise some lenders are willing to structure on request.

Interest-only home equity lines of credit are particularly common during the draw period of a HELOC, meaning a borrower using one for ongoing expenses may be paying interest only for years before any of the drawn principal actually starts being repaid at all.

A bank offering this structure will typically stress-test the borrower against the future fully amortizing payment before approval.

• Consumer Financial Protection Bureau