Quick Summary
Monthly @ start rate:
Monthly @ buydown rate:
Monthly @ refi rate:
Monthly savings (buydown vs start):
REAL breakeven
Includes refinance costs.
Formula: (Buydown upfront − refi costs) ÷ monthly savings
“LIE” breakeven
Ignores refinance costs (the number you’re often quoted).
Formula: Buydown upfront ÷ monthly savings
Note: If “REAL” shows fewer months than the “LIE,” it means including refi costs gets you to parity sooner than the sales-y figure suggests.