We’ve also learned this lesson the hard way. These are now the clauses we require in every project we do:

- Payment is due X days after receipt of invoice, or immediately after the consultant has addressed any quality issues, whichever is sooner

- Late payment shall incur interest at 8% above the BoE base rate and a late fee of 100 GBP as per the UK Late Payment Legislation. Partial payments on invoices shall apply to late fees, interest, and then principal, in that order.

- In the event of a late payment the invoice for the next deliverable shall immediately fall due.

- The consultant shall be entitled to shift deadlines on deliverables in the event of a late payment as a result of any work disruption, without incurring any liability.

- Payment shall be made in X currency, or an exchange rate at X date on Oanda.com shall apply.

- The client is responsible for any bank fees incurred by their, or any intermediary bank. In the event of a SWIFT transaction it shall be made with the OUR payment code.

- The jurisdiction in the event of a conflict shall be England and Wales. Neither party shall be bound by arbitration.

- The client and consultant shall both indemnify the other up to the total value of the contract and shall not under any circumstance be liable beyond X GBP.

We also no longer share downloadable links of our deliverables until they are paid up. They get a view/comment only link for reports/data etc.

We’ve found that clients that aren’t willing to accept these terms won’t pay you either way.

We determine the net days on the invoice based on the credit rating of the client. Ironically, the good clients pay within 2-3 days normally, and the difficult ones are very “long tail”. About 1% of contracts tend to fully or partially default on their payments.

We’re in a particularly credit poor industry but our average delay due to late payment is 23 days. Those clients where we stop delivery pay on average 11 days sooner than those contracts where we don’t stop delivery.

This is based on around 2,000 invoices sent over the last 5 years.