Sign-on bonuses are mostly reserved for hard to fill roles or higher level leaders and even in those instances, it's mostly for equity that you would leave behind in your prior company so WF will "buy you out" of that equity by granting RSRs of WF that would vest over time (sometimes w/ a certain portion of it being cash up front upon onboarding). So if you're just a typical person who gets a yearly bonus from your former company, but not until January (think our discretionary bonuses here) and you're leaving midyear from your employer and say "but by doing this, I will lose the bonus from my employer from the whole year", that almost never will qualify for them to give you a sign-on bonus to make up for this, except for rare instances in which the business agrees to fund it for just an average joe who doesn't have a specialized hard to find skillset or a senor level position.