A home equity line of credit is structured in two distinct phases, and confusing the two — or not planning for the transition between them — is one of the more common pitfalls HELOC borrowers run into. Understanding how the draw period and repayment period differ can help homeowners budget accurately over the full life of the credit line.
The Draw Period
The draw period is the initial phase of a HELOC, during which the homeowner can borrow against the credit line as needed, up to the approved limit. Common draw periods run around 10 years, though the exact length varies by lender and loan agreement.
Key characteristics of the draw period include:
- Flexible borrowing. Funds can be drawn, repaid, and drawn again during this period, similar to how a credit card works, up to the approved credit limit.
- Interest-only payments are common. Many HELOCs only require the homeowner to pay interest on the outstanding balance during the draw period, not principal. This can make monthly payments significantly lower than they will be later, but it also means the principal balance doesn't shrink unless the homeowner chooses to pay more than the minimum.
- Variable interest rate. Most HELOCs carry a variable rate tied to an index, such as the prime rate, plus a margin set by the lender. This means the interest-only payment amount can fluctuate throughout the draw period as rates change.
- Access via checks, cards, or transfers, depending on the lender, making it easy to draw funds for ongoing or phased expenses like renovations.
The Repayment Period
Once the draw period ends, the HELOC enters the repayment period, during which no further draws are typically allowed and the homeowner must begin paying down both principal and interest on the outstanding balance. Repayment periods commonly run 10 to 20 years, depending on the loan agreement.
Key characteristics of the repayment period include:
- Principal and interest payments. Unlike the interest-only structure common during the draw period, repayment period payments are amortized to pay off the full balance by the end of the term, similar to a traditional loan payment structure.
- Payment shock is common. Because draw period payments are often interest-only, the transition to a fully amortizing principal-and-interest payment can result in a significantly higher monthly payment — sometimes described as "payment shock" — even if the interest rate itself doesn't change.
- Rate may still be variable. In many cases, the interest rate continues to be variable during the repayment period as well, meaning payments can still fluctuate with rate changes on top of the shift to principal-and-interest payments.
- No further access to funds. Once repayment begins, the homeowner generally can no longer draw additional funds, even if they pay down part of the balance, unless the lender offers a renewal or new line.
Estimating the Payment Jump
The size of the jump between draw-period and repayment-period payments depends on the outstanding balance, the interest rate, and the length of the repayment term. As a general pattern, the larger the balance carried into repayment and the shorter the repayment term, the bigger the payment increase tends to be, since the remaining balance must be paid off faster. A mortgage payment calculator or amortization schedule calculator can help estimate what a fully amortizing payment would look like on a given balance, rate, and term, which can be a useful proxy for what a HELOC repayment period payment might resemble.
Planning for the Transition
Because the shift from draw to repayment can significantly change a household's monthly obligations, it's worth planning ahead:
- Know the exact draw period end date, which is specified in the original HELOC agreement, so the transition isn't a surprise.
- Pay down principal during the draw period when possible, even though it's not required, to reduce the balance that carries into the more expensive repayment phase.
- Model the repayment-period payment using the current balance and remaining term, to understand roughly what the new payment might look like under different rate scenarios.
- Consider refinancing options before the draw period ends, such as converting the HELOC balance into a fixed-rate home equity loan, or exploring a cash-out refinance that could roll the balance into a new first mortgage, depending on rates and overall financial goals at the time.
- Check whether the lender offers a renewal, since some lenders allow qualified borrowers to renew or extend a HELOC's draw period rather than automatically entering repayment.
Why This Structure Exists
The two-phase structure of a HELOC reflects its design as a flexible, revolving credit tool rather than a lump-sum loan. It allows homeowners to access funds over an extended period for varied or evolving needs — home improvements, unexpected costs, or other borrowing — without needing to reapply for a new loan each time, while still ultimately requiring the balance to be paid down like any other debt. Understanding this structure from the outset, rather than focusing only on the lower draw-period payment, is central to using a HELOC responsibly. For more on how HELOCs compare to lump-sum alternatives, see home equity loans vs. HELOCs and HELOC requirements explained.