Somewhere in your books right now there is an invoice that has been sitting unpaid for 45 days. You did the work, you sent the bill, and now your customer has gone quiet. Every week it ages, your odds of seeing that money fall — and if you hand the account to a collection agency, you will typically give up 15 to 30 percent of whatever it recovers.
Here is the good news: most overdue invoices from legitimate customers do not need a collector. They need a system. A short, consistent follow-up cadence recovers the large majority of past-due balances, preserves the customer relationship, and costs you nothing but discipline. This guide gives you that system: the terms to set before work begins, the aging schedule that tells you who to chase, a 7/15/30-day dunning cadence you can run yourself, and the honest answer on where do-it-yourself collection ends.
Start Before the Invoice Is Late: Terms That Make Collection Possible
Collection gets dramatically easier when the groundwork is in your contract, quote, or written terms — agreed before the work starts, not added after the customer stops paying. Three clauses do most of the work:
Clear payment terms. State the due date plainly: Net 15, Net 30, due on receipt. Vague terms like "payable promptly" are unenforceable and invite every customer to define "promptly" in their own favor.
A late-fee clause. A common convention for small businesses is 1 to 1.5 percent per month on overdue balances, and a widely cited rule of thumb is to keep the annualized rate at or under 10 percent to stay clear of state restrictions. Name the rate, when it starts accruing, and whether payments apply to fees first. Whatever you choose, the fee must be disclosed in writing before the debt exists — a fee you invent after the invoice goes unpaid is generally unenforceable, and states set their own ceilings on what you can charge.
A collection-costs clause. One sentence — that the customer is responsible for reasonable collection or legal fees if the account goes to a third party or to court — changes the economics of ignoring you. Many customers who will shrug at a late fee will pay to avoid funding your lawyer.
Put the same terms on every invoice. Consistency is what makes them enforceable and what keeps any single customer from claiming they never agreed.
Build Your Aging Schedule: The Dashboard That Tells You Who to Chase
You cannot run collections off memory. An accounts receivable aging schedule groups every unpaid invoice by how long it has been outstanding, typically in five buckets: current, 1–30 days past due, 31–60 days, 61–90 days, and over 90 days. Run it weekly. The buckets tell you at a glance where the problem concentrates — two invoices in the 61–90 bucket deserve your attention far more than twenty current ones.
Pair the schedule with one headline metric: Days Sales Outstanding, or DSO. The formula is simple:
DSO = (Accounts Receivable / Credit Sales) x Number of Days in the Period
If you carry $50,000 in receivables against $100,000 in monthly credit sales, your DSO is 30 days. Compare the result to your stated terms. A business selling on Net 30 with a DSO drifting past 45 is financing its customers interest-free, and the aging schedule shows exactly which accounts are dragging the average. Watch both together: DSO tells you whether collections are slipping overall, and the aging buckets tell you which doors to knock on first.
The 7/15/30-Day Dunning Cadence
A dunning cadence is just a fixed sequence of reminders with escalating firmness. The schedule below works for most small businesses selling on Net 15 or Net 30 terms. Adjust the day counts to your terms, but keep the escalation logic: assume good faith early, get specific in the middle, and put consequences in writing at the end.
Before the due date: the pre-due reminder. A few days before the invoice comes due, send a short courtesy note with the invoice attached and a payment link. This single touch resolves a surprising share of "late" payments, because many of them were never going to be late — the invoice was sitting in someone's inbox behind a vacation auto-reply. It also removes the most common excuse later: nobody can claim they never received the bill.
Day 7 past due: the friendly nudge. Assume an oversight. A brief email restating the invoice number, amount, and due date, with the invoice attached again, collects most of what the pre-due reminder missed. Keep it to one invoice per message so nothing gets lost in a thread about five different bills.
Day 15 past due: the firm follow-up plus a phone call. The tone shifts from "in case you missed this" to "this is now two weeks overdue, please confirm a payment date." This is also when you pick up the phone. Email is easy to ignore; a calm, professional call surfaces the real story — a dispute over the work, an approver who left, a cash crunch — while there is still time to solve it. Whatever you learn, confirm it in writing the same day.
Day 30 past due: the formal notice. Send a written notice, on letterhead if you have it, stating the overdue amount including any accrued late fees, restating the original terms, and naming a deadline — typically 10 to 15 days — before you escalate. This is also the moment to warn that the account will be placed on credit hold: no new work or shipments until the balance is current. Send it to a decision-maker, not just accounts payable.
Day 45 past due: final demand and the payment-plan offer. A final demand letter restates the full balance, the deadline, and the specific next step you will take — referral to a collection agency or filing in small-claims court. Pair it with one constructive off-ramp: a written payment plan for customers who are struggling but acting in good faith. A customer who signs a plan and makes the first payment is worth more than a customer you sue.
Day 60 past due: the decision point. Internal efforts have a shelf life. Collection professionals generally advise pursuing accounts yourself for roughly the first 60 to 90 days past due, because recovery rates fall steeply once a debt passes the 90-to-120-day mark. At day 60, make a deliberate decision on every remaining balance: payment plan in good standing, referral to an agency or attorney, small-claims filing, or write-off. What you must not do is let the invoice drift into the over-90 bucket with no owner and no next step.
Three habits make the whole cadence work: attach or link the invoice on every outreach, put a payment link in the first paragraph of every email, and log every touch — date, channel, who you spoke with, what was promised. That log is your evidence if the account ever goes further.
Offer a Payment Plan Before You Threaten Anything
Some customers are not avoiding you; they are broke this month. A payment plan converts a balance you might never see into scheduled cash, and it keeps a customer who may order again. Keep plans short — two to four installments over 60 days or less — and always get the agreement in writing: the total balance, each payment amount and date, and what happens if a payment is missed. The standard consequence is acceleration: miss once and the full balance comes due immediately.
Two cautions. First, pause new work or shipments while a plan runs, or at least move the customer to prepayment — extending fresh credit to an account already on a plan is how a 30-day problem becomes a 120-day problem. Second, know that in some states a partial payment or written acknowledgment of the debt can restart the clock on the statute of limitations, which usually works in your favor as the creditor but is worth confirming under your state's rules.
Put Chronic Late-Payers on Credit Hold — and Mean It
A credit hold is exactly what it sounds like: until the overdue balance is paid, the customer gets no new goods, no new billable hours, and no new delivery dates. It is the single most effective lever a small business has, because it converts your problem into the customer's problem the next time they need you.
Announce it in writing, plainly: as of a specific date, the account is on hold; work resumes when the balance is current. Apply it evenly — a hold you lift the moment a customer complains is worse than no hold at all, because it teaches every customer that your deadlines are negotiable. When the balance clears, release the hold in writing and consider keeping the customer on tighter terms going forward: smaller credit limits, deposits on new orders, or shorter payment windows for the next few jobs.
Late Fees and Interest: Charge Them, but Legally
Late fees work partly as compensation and mostly as motivation — an invoice accruing 1.5 percent a month gets prioritized over one that costs nothing to ignore. But three legal guardrails apply everywhere:
- Disclose before, never after. The fee must appear in your contract, quote, or written terms agreed before the work, and on the invoice itself. A fee added retroactively will not survive a dispute.
- Respect state ceilings. Some states cap late penalties or monthly interest, and the caps vary widely. The 1 to 1.5 percent monthly convention and the keep-it-under-10-percent-annual rule of thumb keep most small businesses on safe ground, but verify your state's limit before your terms go out.
- Distinguish fees from interest. Flat late fees and accruing interest are treated differently under some state laws, and finance charges can trigger additional disclosure obligations. If your terms are anything beyond a simple monthly percentage, have a local business attorney review the clause once — it is a one-hour job that protects every invoice you ever send.
One more note on your own conduct while collecting: when you pursue your own invoices under your own business name, the federal Fair Debt Collection Practices Act generally does not apply to you — that law targets third-party collectors chasing consumer debts. But several states extend similar rules to original creditors, and harassment, deception, and 11 p.m. phone calls are off-limits everywhere as a matter of basic business sense. Be persistent, be documented, and be professional.
Know Where DIY Ends: Agencies, Small Claims, and Write-Offs
An honest playbook names its own limits. Here is how to think about each balance that survives your 60-day cadence:
Collection agencies make sense for larger balances where your time is worth more than their cut. Expect contingency fees in the 15 to 30 percent range or higher for older debts, and check any agency's licensing and reputation before you sign — your name stays attached to how they treat your customer.
Small-claims court is the DIY-friendly legal option for balances under your state's limit, which runs from a few thousand dollars to the mid five figures depending on where you file. Procedures are designed for non-lawyers, filing fees are modest, and in many cases the served summons alone produces payment. Send your final demand first — judges notice who tried to resolve things — and bring your documentation: contract, invoices, delivery proof, and your log of collection touches.
Write-offs are the right answer for balances that cost more to chase than they are worth. Writing off a debt is not giving up; it is a bookkeeping decision that clears a fictional asset from your ledger so your financials tell the truth. And as the next section explains, it can carry a tax benefit.
The Tax Consolation Prize: Writing Off What You Cannot Collect
If you report income on the accrual basis, an unpaid invoice was already counted as revenue — so when it becomes genuinely uncollectible, the tax code offers a business bad-debt deduction under Internal Revenue Code section 166. Two timing rules matter:
- A wholly worthless debt is deductible in the year it becomes worthless. You are not strictly required to remove it from your books to claim the deduction, but record the charge-off anyway — if the IRS later argues the debt was only partially worthless, the missing journal entry can cost you the entire deduction.
- A partially worthless debt is deductible only up to the amount you actually charge off on your books during the tax year, and the entry must be recorded before year-end. Spot a half-dead $10,000 balance in November but wait until spring tax prep to book the entry, and that year's partial deduction is gone.
One important caveat: if you report on the cash basis and never counted the invoice as income, there is generally no bad-debt deduction to take — you simply never had the income. (Your out-of-pocket costs on the job remain deductible as ordinary expenses.) Either way, your collection log doubles as tax substantiation: a file showing reminders, calls, a demand letter, and a credit hold is exactly the evidence that a debt went genuinely bad rather than merely stale. And in many states, you can also recover the sales tax you already remitted on a bad debt through your state revenue department's bad-debt deduction process — check the rules where you file.
Keep Every Touch on the Record
Notice how every section of this playbook ends in the same place: your books. The aging schedule that prioritizes your week, the log of calls and letters that backs your demand letter, the charge-off entry that secures your tax deduction, the reconciled payments that prove which invoices are truly outstanding — collections is a bookkeeping discipline wearing a negotiation costume. Businesses that review their receivables weekly collect faster, write off less, and spot troubled accounts while there is still time to act. The ones that discover a nine-month-old unpaid invoice during year-end cleanup have already lost most of their leverage.
Keep Your Cash Flow Visible From Invoice to Collection
Chasing payment is nobody's favorite job, but with clear terms, a weekly aging review, and a steady 7/15/30-day cadence, you can recover most overdue balances yourself — no agency cut required. The common thread is clean, current records: when every invoice, payment, reminder, and write-off lives in one transparent ledger, nothing slips into the over-90 bucket unnoticed. Beancount.io provides plain-text accounting that gives you complete transparency and control over your financial data — no black boxes, no vendor lock-in. Get started for free and see why developers and finance professionals are switching to plain-text accounting.
