most commercials are on contracts which have all the projected work for the year totaled and divided by 12 into equal installments...one billed each month..
in your case, I would bill on Oct 1 and expect payment by the 20th...
no billing after the fact and its not exactly billing before the work is completed...
its levelized billing; allowing you to expand and grow--
1989 BlueChevy 1500 Extended cab with FULL bed
1978 7ft Sears cargo trailer with added wood inserts to hold both my weedeaters
3 1976-83 vintage lawnboy lawnmowers with full self propel features as well as mulch kits
2 Sears electric weedeaters
1 green machine electric leaf blower
1 sears articulating hedge trimmer-electric
2 50ft power cords
3 Leaf rakes
1 pocket knife
cooler for beer
lawn chair to enjoy a beer while I wait for the cash to be handed to me