Invoice Not Paid for 90 Days? Here's What to Actually Do Next

Three months. That's how long you've been waiting. You sent the invoice, followed up politely, maybe followed up again less politely, and... nothing. When a small business invoice hasn't been paid for 90 days, you're past the "maybe they forgot" stage. Something else is going on.

At this point, you need to stop hoping and start deciding. Not every old unpaid invoice is worth chasing. Some are. Here's how to figure out which is which, and what to actually do about it.

First: Figure Out Why It's Been 90 Days

Before you pick a strategy, you need an honest read on the situation. The reason matters because it changes what will actually work.

They're avoiding you. You've emailed, called, maybe texted. Radio silence. This is the most frustrating scenario, and unfortunately the most common one at the 90-day mark.

They're in financial trouble. They might actually want to pay but can't. Small businesses go through cash crunches. If your client is struggling, aggressive tactics might get you nothing faster — because there's nothing to get.

It fell through the cracks. Less likely at 90 days, but it happens — especially with larger companies where your invoice got stuck in an approval queue, someone quit, or accounts payable lost the paperwork. One final attempt through a different channel (a phone call to their office manager, a LinkedIn message to the owner) sometimes shakes this loose.

They dispute the work. Maybe they're unhappy with what you delivered but never told you. At 90 days, this silent dispute has calcified into "I'm just not going to pay."

Each of these calls for a different move.

Your Realistic Options for a Three Months Unpaid Invoice

Let's be honest about what's on the table and what each option actually looks like in practice.

Send a Final Demand Letter

If you haven't sent a formal demand letter yet, do it now. Not another friendly reminder — a letter that clearly states the amount owed, the original due date, and a deadline (usually 10-14 days) with a specific consequence if they don't pay.

Here's a template you can adapt:

Subject: Final Notice — Invoice #[NUMBER] — Payment Required by [DATE]

Hi [Name],

I've reached out several times regarding Invoice #[NUMBER] for $[AMOUNT], originally due on [DATE]. As of today, this invoice is [X] days overdue.

I'd like to resolve this directly. Please remit payment of $[AMOUNT] by [DEADLINE DATE].

If I don't receive payment or hear from you by that date, I'll need to explore other options to recover this debt, which may include collections, legal action, or reporting to credit agencies.

I'd genuinely prefer not to go that route. If there's an issue with the invoice or you need to discuss a payment arrangement, please let me know by [DEADLINE DATE].

[Your name]

Send it by email and certified mail if you have their physical address. The certified mail part matters — it creates a paper trail and signals you're serious.

Negotiate a Payment Plan

Sometimes getting paid slowly is better than not getting paid at all. If the client responds to your demand letter and says they can't pay the full amount, consider a payment plan.

Put it in writing. Even a simple email exchange where you both agree to "$500/month for three months starting May 1st" is better than a verbal promise. If they miss the first payment, you know the plan isn't going to work and you can move to harder options without guilt.

Hire a Collections Agency

At 90 days, this is a legitimate option. Collections agencies typically take 25-50% of whatever they recover. That sounds like a lot, and it is — but 50-75% of something beats 100% of nothing.

A few things to know:

• Recovery rates drop fast with age. The older the debt, the less likely collection. At 90 days, you're already on the downslope. Don't wait another 90.
• Pick an agency that works with small businesses. Some agencies have minimums ($500-$1,000) that make small invoices impractical.
• It will probably end the relationship. If that matters to you, weigh it. If the client has ghosted you for three months, the relationship is probably already over.

Small Claims Court

For invoices under your state's small claims limit (usually $5,000-$10,000, varies by state), small claims court is designed to be accessible without a lawyer.

The reality check:

• Filing fees are typically $30-$100.
• You'll need documentation: the contract or agreement, the invoice, proof you delivered the work, and records of your attempts to collect.
• Winning a judgment doesn't automatically mean getting paid. You still have to collect. But a court judgment gives you tools — wage garnishment, bank levies, property liens — that you didn't have before.
• The threat of court is sometimes enough. Sending a letter that says "I've filed in small claims court, your hearing date is [date]" gets attention in a way that emails don't.

Consult a Lawyer (for Larger Amounts)

If the invoice is over your small claims limit or the situation is complicated (multiple invoices, contract disputes, out-of-state client), a consultation with a business attorney is worth the $200-$400 it typically costs.

Some attorneys will send a demand letter on their letterhead for a flat fee. A letter from a law office hits differently than one from you. It's not magic, but it works more often than you'd expect.

When to Write It Off and Move On

Here's the part nobody wants to hear: sometimes the smartest business move is to stop chasing the money.

Consider writing off the invoice if:

• The amount is under $500 and you've already spent hours on it. Your time has value. Calculate what you've spent on follow-ups and weigh it against what you'd recover.
• The client has no assets or has gone out of business. You can't squeeze water from a stone. Check if their business is still operating before investing more effort.
• The cost of recovery exceeds the invoice. Lawyer fees, court costs, and your time can add up fast on a $1,500 invoice.
• Your mental health is taking a hit. This is a real factor. Spending months angry about an unpaid invoice affects your other work, your client relationships, and your ability to focus on earning new revenue.

If you do write it off, talk to your accountant. Bad debt can often be deducted as a business expense, which softens the blow.

How to Prevent the Next 90-Day Invoice

Getting burned once is a lesson. Getting burned the same way twice is a pattern. After you've dealt with the immediate problem, put systems in place:

Require deposits. 25-50% upfront means you're never fully exposed. Even if a client ghosts after delivery, you've already been paid for part of the work.

Shorter payment terms. Net 15 instead of Net 30 means an overdue invoice hits your radar sooner. The earlier you follow up, the more likely you are to get paid.

Automated follow-ups. The reason invoices hit 90 days is usually that nobody followed up consistently at 7, 14, and 30 days. Automating those early reminders catches problems while they're still small.

Better contracts. Include late payment fees, right to pause work, and clear payment milestones. You probably won't enforce all of these, but having them in writing changes the dynamic.

Credit checks for large projects. For projects over a few thousand dollars, it's reasonable to check whether a new client has a history of paying their bills.

An invoice that's 90 days overdue didn't get there overnight. It got there because something broke down in the first 30 days and nobody caught it. Fix the early warning system and you'll rarely face this situation again.

Automated payment reminder tools can catch overdue invoices long before they hit 90 days — so you can focus on the work instead of chasing payments.