Google offers signing bonuses ranging from \10$100$K+ (L5+). This is a one-time payment, usually paid within your first month.
The signing bonus is often used to bridge the gap during your first year before equity vests (the -year cliff). If you're leaving unvested equity at your current company, Google may increase the signing bonus to offset it.
Signing bonuses are taxed as ordinary income at your marginal rate. A \50$30$35$K after taxes.