The agreement will include partial pay and bonuses and help keep other Sheffield United staff members on other pay.
The deferrals are expected to last for six months, and include some of Wilder's senior staff.
Wilder said: "It is a difficult time for everyone and that includes football clubs and this particular measure is all about our football club.
"I've had similar experiences of cash flow problems at other clubs and I'm delighted that my staff have supported me in assisting our club in a small way."
United CEO Bettis added: "There is a long uncertain road ahead, but we remain committed to doing everything we can to ensure the stability of this great football club.
"I'd like to thank Chris and the senior coaching staff for being united in joining me in these short-term remuneration deferrals."