The arithmetic people skip
A cash-out refinance replaces the entire first mortgage. That means the rate on the new loan applies to the whole balance, not just the cash being taken out.
When the existing first carries a rate well below what is available today, that trade can cost far more over time than the equity being accessed is worth. A second lien avoids the trade entirely, the first stays exactly where it is and the new loan sits behind it.
Line of credit or fixed second
A line of credit suits money you will draw unpredictably and repay, a rehab pipeline, or reserves you want available but not borrowed until needed. You pay on what you have drawn.
A fixed second suits a known one-time number, like the down payment on a specific purchase. The payment is predictable from day one.
The wrong choice here is rarely fatal, but a line used for a single lump-sum purchase usually costs more in rate than a fixed second would have.
Combined position is what gets underwritten
A second lender is not looking at the new loan in isolation. It is looking at the first mortgage plus the new loan measured against the property’s value, the combined position.
That is why the payoff balance and the rate on the existing first matter as much as the property does, and why the honest first question is what you owe rather than what the house is worth.
Investment property changes the product
Seconds on a rental exist but come from a smaller set of lenders than owner-occupied ones, and the terms differ. An investment-property second is business purpose, which is a different lane from the consumer version, available in nearly every state rather than only where I am licensed.
A home you live in is a consumer loan and available in select states.
When a refinance really is the better answer
If the existing first is already at or above current market, the reason to protect it disappears and a single refinance is usually simpler and cheaper than carrying two liens.
The same is true when the amount needed is large relative to the first mortgage. Send both numbers and the comparison is quick to run. Terms and eligibility vary by scenario; this is not a commitment to lend.