If working for commercial, i
Get the invoice in the post the same day if possible.
Wait 30 days and if no payment, i send a STATEMENT showing all outstading invoices with due dates and i highlight the overdue ones in RED. (this is good becuase of you have done work since the invoice you are chasing up the account people sometimes pay em all in one go)
If i dont hear any thing within 3 days from sending the letter i call my Contact and ask if they deal with the accounts or if not ask to speak to the acoidiots people, allways try to speak direct to accounts and cut out your contact who will just be an unessicarry link in the chain, this isnt allways possible and sometimes yout contact can be usefull, but ive found more times than not its best to speak to accounts direct as they have all the information, ask them who looks after ACCOUNTS PAYABLE, ask if they do payment run's and if so which dates in the month (this will help you predict when you will get paid on any future invoices and also let you work out if your invoice was missed in a payment run), ask when they will pay and also offer to supply BAC's details, it all seems to be going to BAC's nowadays and only takes 3 days to clear, better than a Cheque. If you still cannot get payment then follow the steps in the prevois posts, there are plenty of Debt recovery companies out there who are only too happy to add thier fee and chase up the money for you. Golden rule is not to sound like you are ASKING for your money and dont let accounts sound like they are doing you a favour, if it has got to the stage where you need to chase them up they OWE you a speedy resolution, after all you have been patient enough to wait 30 days for your money then send them a reminder and call them, you wouldnt do this for a domestic customer would you, i know i wouldnt dream of leaving without payment. Hope this helps.
Dene