GEO3: 3515 -5616
GEO4: 4545-7271

see the overlap. So if you are geo3 pay is 4k...get promoted to geo4 jump is abt 500odd.
If you geo3 pai is already at 4.5k then your jump is probably equivalent of 1 additional annual uncrement ie total 400.
Thats what happened to me when I went frm geo4 to geo5. Hence sime think nt worth it cos uncrement is little but expectations are higher ans chances of getting D as geo5 higher(mainly cos of KPs who are geo5 and nt gotten their seo grade yet)