The phrase "additional outlay" refers to extra money that needs to be spent on top of the initial cost or expense. It represents the additional or extra payment required for something. Full definition
Yet the hybrid powertrain itself commands very little additional outlay over the equivalent non-hybrid RAV4. (Autoweek.com)
Reliance on USB - C for a headset connection is not unusual at the higher end these days, and it's nice to see HTC helping USB - C newcomers avoid additional outlay: you get a pair of HTC USonic earbuds, and in case you want to use an existing set there's also a 3.5 mm converter in the box. (zdnet.com)
Qualification for champions league and fourth place in the premiership where the club would set to gain money set against the additional outlay on top class players to finish a few places above fourth and pocket slightly more money — its a no brainer from a business perspective. (justarsenal.com)