That was your mistake. The grant recipient or department has as much incentive to fully spend the money as your consultant boss does to bill it. It's a implied understanding.
Spend the budget or next time people will ask why you need all that money when you didn't spend it last time. Expensive projects are important projects. Important projects make careers. That is baked in several layers deep. You'd need to report it to a waste and fraud line, ombudsman, or similar.
I'm not sure its unusual enough to bother, though.
> Spend the budget or next time people will ask why you need all that money when you didn't spend it last time.
I've always heard of this nugget of wisdom but never really understood it. By punishing those who underspend (by making the next application harder), wouldn't you incentivise inflated research costs, or worse, fraud. Seems like a quick path to a positive feedback loop towards the degradation of trust in academic spending, leading to "poor government efficiency".
But if someone doesn't need a big budget it makes sense to decrease it. It reduces efficiency if you force yourself to spend the whole budget.
This is all simultaneously true and simultaneously disappointing. It requires a certain forfeiture of morality to be a part of this status quo. But, especially on grants between academia and the government, this very much seems to be the status quo.
I decided to take the advice of my lawyers who specialized in the topic of government projects. Based on the budget someone could have easily gone to prison and it probably would have been me because it looked like I was billing 80-hours a week when it was just one of many projects and so I was actually billing ~20/wk. The $1M threshold wasn't an anecdote - at the time it really was the limit in project size for prison time.