This feature (not offered by all lenders) allows you to double up your mortgage payments anytime without penalty. This feature is often associated with the ability to \"skip\" an equivalent number of payments. This can be used either to accelerate the pay-off of a mortgage (as it is an enhanced prepayment privilege) or to manage a volatile cash flow. For example, commission-based individuals such as Realtors could \"double-up\" with each commission cheque, and \"skip\" during low cash flow periods.