Cash flow for agencies: surviving the 60-day payment gap

Agencies pay salaries monthly and get paid quarterly, more or less. That mismatch is the whole problem, and it's why profitable agencies run out of money.

You pay the team in the month they do the work. You invoice at the end of the project or the month. The client's terms are net 30 or net 60, their finance team runs payments every second Thursday, and the invoice went in a day after their cut-off. You are funding your client's working capital out of your own, and unlike a bank you're doing it at 0%.

Calculate your actual cash gap

Not your payment terms. The full distance between spending money and receiving it.

Cash gap (days) = days to deliver
                + days from delivery to invoice
                + payment terms
                + average days paid late
                − days you take to pay your own costs

A realistic version for a project-based agency:

	Days
Work delivered before invoicing	30
Delay between milestone and invoice going out	5
Payment terms (net 60)	60
Average overrun on terms	15
Less: your own supplier terms	−30
Cash gap	80 days

Then price the gap. If your monthly cost base is $68,000, that's $816,000 a year, or $2,235.62 a day. Eighty days of it is roughly $178,800 of cash you must have permanently tied up just to operate at current size.

That's the number to compare against your bank balance and your facility. Most owners have never calculated it, and are surprised by how large it is relative to their annual profit.

Growth makes it worse, not better

This is the part that catches people, because it's counterintuitive: the better your sales quarter, the tighter your cash gets.

Take an agency billing $80,000 a month, costs at 85% of billings, on net-60 terms so cash arrives two months after invoicing. It starts adding $8,000 of billings a month — steady, healthy, unspectacular growth.

Month	Invoiced	Cash in	Cash out	Net	Cumulative
1	$80,000	$80,000	$68,000	+$12,000	$12,000
2	$88,000	$80,000	$74,800	+$5,200	$17,200
3	$96,000	$80,000	$81,600	−$1,600	$15,600
4	$104,000	$88,000	$88,400	−$400	$15,200
5	$112,000	$96,000	$95,200	+$800	$16,000
6	$120,000	$104,000	$102,000	+$2,000	$18,000

Over six months: $600,000 invoiced, $510,000 of cost, $90,000 of profit. Cash generated: $18,000.

The missing $72,000 is receivables. At the start, two months of billings were outstanding — $160,000. By month six it's $232,000, because the two months now outstanding are bigger months. Growth converted $72,000 of profit into an asset you can't spend.

Profit $90,000 − increase in receivables $72,000 = cash $18,000

Nothing is wrong in this business. Margin is 15%, growth is steady, clients pay. And months three and four are cash-negative. Accelerate the growth and those months get deeper, which is exactly how agencies fail on the way up.

Six things that actually move the number

Most cash-flow advice is "invoice faster." That helps, but it's one of six levers and not the strongest.

Invoice on a schedule, not on completion. Monthly or fortnightly billing against progress rather than a single invoice at the end pulls weeks out of the gap. On a three-month project it can halve it.

Take a deposit. 30% up front on project work is normal and rarely refused by clients who intend to pay. It also filters out the ones who don't.

Bill retainers in advance. A retainer invoiced on the 1st for that month is a fundamentally different instrument from one invoiced on the 30th for the month just gone. Same revenue, entirely different cash profile.

Shorten the invoice lag, not the terms. Negotiating net 60 down to net 30 is hard. Getting your own invoices out within 24 hours of the milestone is free, and on the table above the internal delay is 5 of the 80 days.

Chase before the due date. A short note a week before an invoice is due, confirming it's in the payment run, moves more money than three angry emails afterwards. Most late payment is administrative, not adversarial.

Get a facility before you need it. An overdraft or invoice finance line arranged during a good quarter costs almost nothing to hold and is unobtainable during a bad one.

Watch the thirteen-week view

Annual budgets and monthly P&Ls are the wrong instrument for this. What you need is a rolling thirteen-week cash forecast: expected receipts by week based on actual invoice dates and each client's actual payment behaviour, minus payroll, tax, rent and suppliers by week.

Update it every Monday. It takes twenty minutes once it exists. It will show you, weeks in advance, the specific Friday where payroll is tight — which is enough time to accelerate an invoice, delay a hire, or draw on a facility calmly.

The forecast is also the only honest way to answer "can we afford this hire?" A hire is a cash commitment starting immediately against revenue arriving in three to five months. The P&L makes that look fine. The thirteen-week view shows you the trough.

This week

Pull your last twenty paid invoices and record two dates each: date issued and date the money landed. Average the difference. That's your real terms, as opposed to the terms printed on the invoice.

Then multiply it by your daily cost base. That's what your payment gap costs you to hold. If the number is larger than your cash balance, you don't have a profitability problem — you have a timing problem, and timing problems are far easier to fix.