What a cash-out refinance really costs
The cost lands on your whole mortgage, not just the cash you pull out.
- Closing costs run 2–6% of the new loan, and the new loan is your whole balance plus the cash.
- The new rate applies to that whole balance. A higher rate reprices money you'd been paying down cheaply.
- Restarting the term, often back to 30 years, can add a lot of total interest.
- The catch: a small cash-out can carry a large cost, because the reset hits the entire mortgage.
The three costs, put in numbers
A cash-out refinance replaces your mortgage with a bigger one and hands you the difference in cash. That means three costs, and none of them stay small just because the cash is small.
Closing costs run 2–6% of the new loan amount. The new loan is your whole mortgage plus the cash you pull out, so the percent is charged on the full balance. On a large balance, 2–6% is a large dollar figure — before you've spent a cent of the cash.
The new rate applies to the entire balance. Not just the cash. If today's rate is higher than your current one, you now pay that higher rate on money you'd already been paying down cheaply. You gave back a low rate to reach the cash.
Restarting the term resets the clock. A refi often puts you back to a fresh 30 years. Even at the same rate, more years of interest means a lot more total interest over the life of the loan.
A worked example
Say you owe $250,000 at 3.5% with 22 years left, and you need $40,000. Two ways to get it:
Keep the low-rate mortgage + a small second mortgage $250,000 stays at 3.5% (untouched) $40,000 second at 8.5% over 15 years Interest on the $40,000 ≈ $30,900 Refinance the whole balance $290,000 new loan at 7.0% over a fresh 30 years You reprice the old $250,000 up from 3.5% to 7.0% Extra interest on that repricing ≈ $175,000+ Plus closing costs of 2–6% on $290,000 ≈ $5,800–$17,400
Refinancing the whole balance can cost far more overall, because you repriced $250,000 you were carrying cheaply. Keeping the low rate and adding a small second loan touches only the $40,000 you actually need.
The rule: only cash-out refinance when the new rate is at or below your current one, and you'll stay in the home long enough to earn back the closing costs.
The closing costs and the rate reset apply to your entire mortgage, not to the slice of cash you take out.
So a small cash-out can carry a large cost. Pulling $20,000 can still reprice a $250,000 balance and reset its clock. Before you refinance, compare it with a second mortgage that leaves your first loan alone.