"Budgetary restraints" refers to limitations or restrictions placed on spending. It means that there is a limit on the amount of money that can be spent or allocated for a particular purpose or project. Full definition
But, because the foundation has to work within existing budgetary restraints, fewer fellowships will be available overall, leading to grey skies for some. (sciencemag.org)
Many of those who do not subscribe expressed cost and budgetary restraints as a factor. (slaw.ca)
Their costumes, meant to be period - specific, reek of budgetary restraint, resembling a dinner - theatre production of a historical epic. (filmfreakcentral.net)