ARE YOU FOR REAL .....
..... Where did you get 8750%apr from


You can't just pick an APR out of the sky and charge it.
First of all to charge interest you need to base all invoicing on 30 days, which it sounds like you are doing. I keep telling owners i know, what is the point of having 7 day terms ect as it is not backed by law, 30 days are.
You can find everything you need to know here -
http://www.contractorcalculator.co.uk/contractor_guide_charging_interest_late_payments.aspxYou can, for each day outstanding charge interest, after 30 days i let them know that i will send a revised invoice each week with interest untill the invoice is cleared.
The interest you can charge
legally is the reference rate of the Bank of England ( base rate ), plus 8%, this is APR i'm talking about, you need to break it down to a daily rate.
You can find out the current base here ( 0.5% at the moment ) -
http://www.bankofengland.co.uk/Pages/home.aspxThis is how you work out the daily rate from the 8.5 APR you can charge -
For example -
£1,000 x 8.5% = £85.00 (the interest to be paid in a year APR)
£85.00 / 365 days (variable) = 23p (the daily interest rounded off)
Let's say they are 50 days overdue after your 30 days terms,
you can charge 23p x 50 days = £11.50 (the interest owed to date on 50 days)
You can find a late payment calculator here to work it out -
http://www.contractorcalculator.co.uk/late_payment_calculator.aspxOne more thing, you will need to make it clear on your invoice that you will charge interest after each outstanding day in your terms or they will just say you did not warn them.
Here is part of my terms on my invoice that makes it clear were i stand on interest charges -
PAYMENT TERMS/DETAILS –
30 Days Terms -
Invoice payment to be completed before 30 days
after the invoice date. We WILL use our legal right
to charge interest for every day outstanding after
the 30 days. The current rate is 8.5% APR variable. If
payment is not received by the 30 day terms, we
will send you a revised invoice with a breakdown of
the daily interest charge for every outstanding day
after the 30 days. A revised invoice with interest will
be sent to you every 7 days until payment is
cleared.