Unless you have the luxury of an in-house credit controller - which is something even some larger firms can't afford - you might be tempted to take a head-in-the-sand approach to chasing overdue invoices, and simply try to pretend they never happen.
Sadly they do happen, even from trusted long-term customers, and that can lead in turn to some soul-searching: Why didn't they pay? Did I do something wrong? Is there no trust in business any more?
Many small to medium-sized enterprises (SMEs) across the UK are effectively being forced to loan money to large firms interest-free, according to the Federation of Small Businesses.
In one of a pair of landmark reports issued since the beginning of the year, the FSB warns that late payments and unreasonable renegotiation of payment terms is taking money out of the hands of SMEs, and allowing it to languish for longer in the accounts of the nation's largest corporations.
Many SMEs are aware of the importance of a 'level playing field' when it comes to prompt payments - including the right to be paid on time by big brands, without them using their clout to negotiate longer terms, or their complexity as an excuse for failing to pay at all.
But when you start trading across borders, things can very quickly become even more complicated, because in other countries, even small business clients might be used to significantly different payment terms than they would be in the UK.
The OFT has refused to renew the consumer credit licences of debt purchaser HFO Capital Limited, and two associated debt collectors, HFO Services Limited and Roxburghe (UK) Limited.
Back in March of 2013 we ran an article called "Dodgy Debt Collection Agencies Liquidated" that featured the story of how the Insolvency Service had liquidated two companies run by a Mr Stuart Paul Cooper of Topping Street, Blackpool.
Then it all went quiet and we heard no mention of the name Stuart Paul Cooper until an eagle eyed reader contacted us this week. They informed us that the infamous Mr Stuart Paul Cooper is now serving a three year jail sentence for fraud. So what happened?
It's good to know that, when a dodgy dealer makes off with client money and there's no record of where it's gone, they will face prosecution to the fullest extent of the law.
New figures from the Department of Business, Innovation and Skills show that the BIS Criminal Enforcement Team achieved 198 successful prosecutions in the 2012-13 financial year.
Following on from part one "Going Dutch: Contractor Debt Recovery in the Netherlands" we speak to Alex Tucker, the contractor who found himself at loggerheads with the Dutch agency and find out more about what brought him to this point.
Working for overseas clients is either a gamble, or a logical expansion, depending on which way you look at it - but as a self-employed contractor, you need to be confident that you will be paid promptly, as international debts can be more difficult to pursue.
A recent client handled by Safe Collections demonstrates this well; Alex Tucker had every reason to expect prompt settlement of his invoices by his Dutch client. He had worked with the company, both as a self-employed individual and as temporary staff, since 2005, as well as supplying services via a third-party limited company.
The Professional Contractors Group have called for an anonymous hotline to be created, allowing small business owners to 'name and shame' large companies that pay late or otherwise try to use their 'brand power' to manipulate payment terms.
While the PCG are calling it a 'witness protection' hotline, we prefer to call it Slimeshoppers, as it doesn't get much lower than a big business trying to use their size as an excuse to withhold payment to small suppliers.
Late payment of invoices is now - for the first time in recent years - the single greatest risk to creditors, even outranking debtor insolvency in a report from credit risk insurer Coface UK.
According to the insurer, 60% of the claims it received in the first nine months of 2013 arose due to "a customer's protracted default" - that is, either late or non-payment.