850 is the ceiling — and it matters less than you think
Base FICO and VantageScore both run 300–850. The 900 you sometimes hear about is only on special auto and bankcard scores (250–900).
Roughly 1.6–1.7% of U.S. consumers hold an 850 FICO Score, based on Experian/FICO data reported in recent years.
Lenders price loans in tiers. The best terms usually start in the mid-to-upper 700s — above that, the offer stops improving.
Hypothetical example: a borrower at 780 and one at 850 can qualify for the same mortgage tier — the extra 70 points change the payment by exactly $0.
In the same hypothetical example, dropping one rate tier (7.0% to 6.5% on $300,000) saves $99.71 a month — $35,893.22 over 30 years.
An 850 reflects years of on-time, low-balance borrowing. Income and wealth are not scoring inputs at all.