Ask about a signing bonus or relocation only when there is a concrete reason and you understand which parts of the package are standardized.

MBB compensation can be tightly structured by level and office, so flexibility may be greater on timing, relocation support or specific one-time items than on base salary.

Frame the request around the actual constraint, such as documented relocation cost, rather than simply asking for more money.

Keep the conversation professional and be prepared for the answer to be no. For more detail, see the guide to choosing between consulting offers.

imo I asked once about relocation and they were completely normal about it. That was my experience.

A polite question is very different from trying to negotiate every line item.