A vendor take-back mortgage (VTB) is a mortgage granted by a seller to a buyer when a buyer is buying the property from the seller, but unable or unwilling to pay the entire purchase price on completion. A VTB mortgage similar in most respects to a normal mortgage, save for that it often is also a second mortgage, with the seller agreeing to subordinate its security to standard financing. VTB mortgages are more common when a seller is having difficulty selling a property, and as part of the purchase agreement, agrees to permit the buyer to pay some of the purchase price over time rather than entirely at completion.