The short version: If you’re doing the invoicing, chasing payments and checking job numbers at night, every call you make during the day runs on numbers that are a day old, sometimes older. That slows down your small business cash flow, lets late payers get away from you, and hides labour overruns until the job’s finished and it’s too late to fix them.

• Invoices sent at night go out later than they could have, so the money comes in later too.

• If nobody checks the debtors list during the week, a quick friendly call on Tuesday turns into an awkward one on Sunday night.

• If you only add up the hours after the job’s done, you find out about a 4 to 7 percent cost blowout when you can’t change anything.

It’s nine o’clock at night and you’re finally working out whether last week’s jobs made any money. If that’s a normal weeknight for you, you’re in good company. Doing the accounts after Beer O’Clock comes up a lot when I talk with small business owners here in New Zealand who are still out doing the work themselves.

What does doing the accounts after Beer O’Clock look like?

The day goes on jobs, phone calls and sorting out whatever went sideways by smoko. Then after dinner, the laptop comes out. Invoices get sent, overdue payments get chased, and the job numbers finally get a look.

From the outside it looks like dedication. The books are up to date, nobody can say you’ve let things slide, and the family has learned not to ask how the spreadsheet’s going.

But there’s a cost hiding in that routine. The late hour is the small part of it. The bigger part shows up the next day, in the decisions you make on the job.

Where this leaves you: Night-time bookwork keeps your records tidy, but by the time you use them during the day they’re already a day behind.

What happens when you run the business on yesterday’s numbers?

When the books only get looked at at night, every decision you make during the day runs on information that’s at least a day old. Often older.

That shows up in three places: invoicing, late payers and labour.

How do late invoices slow down your small business cash flow?

An invoice sitting in your head instead of in a customer’s inbox delays payment by exactly as long as it sits there. Research on small business cash flow shows that nearly three in five small businesses have invoices overdue by 30 days or more. Every one of those started out as an invoice that went out later than it could have.

Why do late payers slip through the cracks?

Because nobody looked at the debtors list on Tuesday, when a friendly phone call would have sorted it. By the time you spot it on Sunday night, the polite window has closed and the awkward conversation has grown teeth.

Why do labour costs show up too late?

And then there’s labour. This is the one that catches people out, because a job can look perfectly healthy right up until someone adds up the hours. Research on job costing in the trades found that even small slip-ups in time tracking, like rounding hours or logging them late, can push costs up by 4 to 7 percent. Small slip-ups, too. A rounded-up half hour here, a timesheet filled in on Friday from memory there.

If you only add up the hours after the job’s finished, you find all that out when it’s too late to change anything.

What this means for your week: Day-old numbers cost you in three places at once. Payments come in slower, late payers get harder to chase, and labour overruns turn up after you can do anything about them.

Common questions about doing the books after hours

What does “doing the accounts after Beer O’Clock” mean?

It’s the habit of leaving invoicing, chasing overdue payments and checking job numbers until the working day’s over, usually after dinner with the laptop out.

If the books still get done, what’s the problem?

The timing. When the books only get attention at night, the decisions you make during the day are based on information that’s at least a day old, and often older.

How do late invoices affect small business cash flow?

Payment is delayed by exactly as long as the invoice sits unsent. The research mentioned above shows nearly three in five small businesses have invoices overdue by 30 days or more.

Why does it matter which day I check the debtors list?

A late payer spotted on Tuesday usually needs a friendly phone call. Spotted on Sunday night, the chance for an easy reminder has often gone and the conversation is a lot harder.

How much can sloppy time tracking cost a trades business?

Research on job costing in the trades found that small inaccuracies, such as rounding hours or logging them late, can push costs up by 4 to 7 percent.

When should I add up the hours on a job?

While the job’s still running is better than after. If you only add them up once it’s finished, you find out about any overrun when it’s too late to change anything.

What to take away from this

• Doing the books at night keeps them up to date, but your daytime decisions still run on day-old numbers.

• Every day an invoice sits unsent is another day you wait to get paid, and your cash flow feels it.

• Checking the debtors list during the week means a friendly phone call instead of a hard conversation.

• Small slips in time tracking can add 4 to 7 percent to job costs.

• Hours you only add up after the job’s done can’t help you fix that job.