Here's a number that should bother you: the average small business has 24% of its monthly revenue tied up in accounts receivable at any given time. For a $3M/year business, that's $60K sitting in other people's bank accounts, earning them interest instead of you.
The gap between “invoiced” and “collected” is where cash flow goes to die. And most businesses don't have a system for closing that gap. They invoice, they wait, they follow up when they remember, and they write off balances when they get tired of chasing them.
This is the playbook for fixing that.
Step 1: Set the Right Payment Terms (Before You Start Work)
The best time to get paid is before you do the work. The second best time is the moment you finish. The worst time is net-60, which is when you'll get paid if you don't set terms proactively.
For project-based work: Collect 25–50% up front before work begins. Bill the remainder at milestones, not at project completion. A $40K project should be structured as: $10K deposit, $15K at midpoint, $15K at delivery. This way, your maximum exposure at any point is $15K, not $40K.
For ongoing services: Bill on the 1st for the current month, not at the end for the previous month. “Pay for the month you're about to receive service” is a much easier conversation than “pay for the month you already used.”
For product-based businesses: Net-15 should be your default, not net-30. If a client pushes for net-30, that's a negotiation. They should be offering something in return — larger volume, longer contract, or a premium on the unit price.
The early payment discount. 2/10 net 30 means “take 2% off if you pay within 10 days, otherwise full amount due in 30.” That 2% discount annualizes to 36.7% for your client. It's a great deal for them and an acceleration tool for you. On $100K in monthly invoicing, if 40% of clients take the early discount, you collect $40K ten days faster in exchange for $800 — an excellent trade if you have any use for that cash.
Step 2: The Follow-Up Cadence That Gets Results
Most businesses have no follow-up system. Someone remembers that an invoice is overdue, sends an email, and waits. That's not a system. Here's one that works:
Day of invoice: Send the invoice with a clear due date and payment instructions. Attach the invoice as a PDF. Include a direct payment link if you use online payments. Remove any friction.
Day 7 (for net-15) or Day 20 (for net-30): Send a “friendly reminder” email. Subject line: “Invoice #1234 — due in [X] days.” No guilt, no pressure. Just a reminder. This catches the invoices that fell through the cracks on the client's end.
Due date +1: Send a “past due” notice. Change the tone slightly. “This invoice was due yesterday. Please let me know if there's an issue or when I can expect payment.” This is still professional, but it establishes that you're tracking.
Due date +7: Phone call. Not an email. A phone call. Emails get ignored. Phone calls get answered or returned. Keep it brief: “I'm following up on invoice #1234, which is now a week past due. Can we get this resolved this week?”
Due date +14: Escalation email. This goes to a higher contact at the client company if you have one. “I've been trying to resolve an outstanding balance with [person]. Can you help me get this routed to the right person?”
Due date +30: Final notice. “This invoice is now 30 days past due. If payment is not received by [date], we'll need to pause ongoing work and assess late fees per our agreement.”
Step 3: Know Your Numbers
You can't manage what you don't measure. Two metrics tell you how well your AR process is working:
Days Sales Outstanding (DSO): The average number of days it takes to collect payment after invoicing. Formula: (Accounts Receivable / Revenue) x Number of Days in Period.
If your DSO is 45 and your terms are net-30, you have a collection problem. Every day above your payment terms is a day you're financing your client's business with your cash.
Benchmark: Healthy DSO for most service businesses is 30–35 days. Under 25 is excellent. Over 50 means your collection process is broken or your clients are the wrong clients.
Accounts Receivable Turnover: How many times per year you collect your average AR balance. Formula: Annual Revenue / Average Accounts Receivable.
A turnover of 12 means you're collecting your full AR balance every month. A turnover of 6 means it takes two months on average. Higher is better.
Step 4: The Late Fee Conversation
Late fees work, but only if you actually charge them. Most contracts include a late fee clause (typically 1.5% per month on overdue balances). Most businesses never enforce it.
Here's my approach: include late fees in every contract. Don't charge them on the first late payment. Do charge them on the second. And tell the client when you waive them the first time: “I waived the late fee this time, but our policy is 1.5% monthly on overdue balances going forward.”
This accomplishes two things. First, it signals that you track overdue payments seriously. Second, it gives the client a clear incentive to pay on time going forward. The $150 late fee on a $10K invoice is nothing to argue about, but it's enough to change behavior.
Step 5: When to Fire a Client
Some clients are chronically late payers. Not because they can't afford to pay, but because paying you isn't a priority. They have the cash. They just don't respect your terms.
Here's the math on when a slow-paying client costs more than they're worth:
A client who pays 30 days late on a $15K/month invoice is holding $15K of your money for an extra month. At an 8% cost of capital, that's $100/month in implicit financing cost. Plus the time your team spends chasing payment — let's say 2 hours per month at $50/hour fully loaded — that's another $100. So the slow payment costs you $200/month, or $2,400/year.
If the client's gross margin contribution is $5K/month, $2,400/year is a tolerable nuisance. If the margin is $1,500/month, you're giving back 13% of your gross profit just to collection friction. That's a client worth replacing.
Before firing a client, try one more tactic: switch them to prepayment. “Based on our payment history, I need to move your account to payment-in-advance terms. We'll invoice at the beginning of each month for the upcoming month's work.” Clients who refuse this are telling you they value the float more than your relationship. Act accordingly.
Step 6: Automate What You Can
The follow-up cadence above works, but it requires someone to run it. For businesses sending more than 30 invoices a month, manual follow-up doesn't scale. Here's what to automate:
- Invoice delivery: Send automatically on the billing date. No human should be clicking “send” on invoices.
- Payment reminders: Automated emails at the intervals above. Most accounting software supports this natively.
- Aging reports: Weekly aging report showing all open invoices by age bucket (current, 1–30 days, 31–60 days, 60+ days). Review this every Monday.
- Escalation alerts: Flag any invoice that hits 15 days past due for a manual phone call. This is the step most automation misses.
The Bigger Picture
AR collection isn't a back-office task. It's a cash flow management strategy. Every dollar sitting in accounts receivable is a dollar you can't use for payroll, inventory, marketing, or growth. And unlike a loan, your clients aren't paying you interest on the float.
Reducing your DSO from 45 days to 30 days on $3M in annual revenue frees up approximately $123K in working capital. That's $123K you don't need to borrow, don't need to raise, and don't need to pay interest on. It's already your money. You just need a system to collect it.
