10 Tools for Tracking Outstanding Invoices in 2026

Quick Answer

The best tools for tracking outstanding invoices in 2026 are Duely, QuickBooks, Xero, FreshBooks, Wave, Zoho Invoice, Bill.com, Invoice Ninja, HoneyBook, and Bonsai. The right choice depends on whether you need a full accounting system, a dedicated collections tool, or something in between. For small agencies where the owner is personally chasing clients, Duely is the only tool on this list built specifically around that problem.

What This Guide Covers

• What outstanding invoice tracking actually requires
• The 10 best tools in 2026
• How each tool handles overdue invoices and follow-ups
• Which tool fits your agency size and situation
• Pricing comparison
• Frequently asked questions

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What does tracking outstanding invoices actually involve?

Most agency owners think invoice tracking means knowing which invoices are unpaid. That is the easy part. The harder part is everything that follows: knowing who promised to pay and when, remembering what was said in the last conversation, staying organized across dozens of clients in different payment stages, and following up consistently without it consuming hours every week.

A tool that only shows you which invoices are overdue solves maybe 20% of the problem. A tool that also helps you follow up, log promises, track partial payments, and escalate the tone over time solves the actual workflow.

The tools on this list are evaluated on both dimensions.

Definitions Block

Outstanding invoice An invoice that has been sent to a client but not yet paid, regardless of whether it is past the due date.

Overdue invoice An invoice that remains unpaid after the agreed payment due date has passed.

Payment promise A client's stated commitment to pay by a specific date, typically documented during a follow-up conversation.

Collections cadence A structured schedule of follow-up actions designed to recover outstanding invoice payments.

Partial payment A payment covering only part of the invoice total, often used when a client cannot pay the full amount immediately.

Accounts receivable (AR) Money owed to a business by clients for work already completed and invoiced.

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Why is tracking outstanding invoices difficult for small agencies?

Small agencies often manage 10 to 100 client relationships simultaneously, each at a different stage of the payment cycle. Some clients pay immediately. Some need one reminder. Some need five. Some make partial payments. Some make promises they do not keep.

Without a system, the agency owner carries all of this in their head or across scattered email threads. The result is predictable: invoices fall through the cracks, follow-ups get delayed because the owner is not sure what was said last time, and cash sits uncollected that has already been earned.

According to the Atradius Payment Practices Barometer, nearly 50% of US B2B invoices are currently overdue. A GoCardless and FSB study found that 52% of small businesses give up chasing payments to avoid the awkwardness. The average small agency is sitting on significant uncollected cash at any point in time.

The right tracking tool removes that cognitive load and turns collections into a predictable process.

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The 10 best tools for tracking outstanding invoices in 2026

1. Duely

Duely is a post-invoice collections tool built specifically for small agencies. Its focus is entirely on what happens after the invoice is sent, making it the most purpose-built tool on this list for tracking and recovering outstanding invoices.

Where most invoicing and accounting tools show you which invoices are overdue and send a generic automated reminder, Duely gives you a complete operational workflow. Every client has a chronological timeline showing every follow-up sent, every payment promise recorded, every partial payment logged, and every internal note added. The agency owner always knows exactly where each client stands before reaching out.

The standout feature is that reminders go out from the agency owner's own Gmail account, not from a branded billing system. Clients receive what looks like a personal email, which significantly increases response rates and maintains the working relationship in a way that automated billing system emails do not.

Key features:

• Send reminders from your own Gmail, not from Duely
• Track payment promises with dates and outcomes
• Log partial payments against outstanding balances
• Draft follow-ups in three tones: friendly, firm, or final notice
• Full chronological timeline per client
• QuickBooks, Xero, and Stripe integrations
• Automate reminder cadences at set frequency
• Client can mark invoice as paid from their end
• Internal notes per client
• Export to CSV

Best for: Small agency owners billing 10 to 100 clients who want a structured collections workflow without the manual effort

Pricing: $29/month. 14-day free trial, no credit card required.

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2. QuickBooks

QuickBooks is the most widely used accounting software for small businesses and includes invoice tracking as part of its broader financial management system. It shows overdue invoices clearly, sends automated payment reminders, and integrates with hundreds of other tools.

For agencies that need full accounting alongside invoice tracking, QuickBooks is a strong choice. For agencies whose primary problem is the collections workflow rather than accounting, QuickBooks' follow-up features are functional but not specialized. Many agencies use QuickBooks for accounting and Duely for the collections layer, using the direct integration between them.

Key features:

• Full accounting and payroll
• Invoice creation and overdue tracking
• Automated payment reminders
• Detailed financial reporting
• Multi-user access
• Direct integration with Duely

Best for: Agencies that need comprehensive accounting software with solid invoice tracking

Pricing: From $25/month

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3. Xero

Xero is a cloud-based accounting platform with strong invoice tracking capabilities. Its accounts receivable dashboard gives a clear view of outstanding and overdue invoices, and its automated reminders are more customizable than many competitors.

Xero is particularly popular with agencies in the UK, Australia, and Canada. Like QuickBooks, it covers accounting broadly but does not specialize in the collections workflow. Xero integrates directly with Duely for agencies that want to add dedicated follow-up tracking on top of their accounting system.

Key features:

• Clean accounts receivable dashboard
• Invoice creation and customizable automated reminders
• Bank reconciliation and expense tracking
• Multi-currency support
• Strong mobile app
• Direct integration with Duely

Best for: Agencies wanting a modern accounting platform with solid invoice tracking and international support

Pricing: From $13/month

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4. FreshBooks

FreshBooks is an invoicing and accounting platform popular with freelancers and small agencies. It provides a clear view of outstanding invoices and sends automated payment reminders on a preset schedule.

Its limitations for collections-focused agencies are that reminders go out from FreshBooks rather than the user's email, there is no payment promise tracking, and there is no follow-up conversation log. FreshBooks treats the invoice as the primary artifact and does not build a workflow around what happens when clients do not pay on time.

Key features:

• Invoice creation and outstanding invoice dashboard
• Automated payment reminders
• Expense tracking and time tracking
• Client portal
• Basic reporting

Best for: Freelancers and small agencies that need invoicing and basic accounting with light outstanding invoice tracking

Pricing: From $6/month

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5. Wave

Wave is a free invoicing and accounting tool that includes basic outstanding invoice tracking. The accounts receivable view shows which invoices are unpaid and overdue, and automated reminders can be set up to go out on a schedule.

For agencies on tight budgets, Wave provides the essentials at no cost. Its collections features are minimal and reminders go out from Wave rather than the user's email. For agencies with more than a handful of clients who regularly pay late, Wave quickly reaches its limits.

Key features:

• Free accounts receivable dashboard
• Automated payment reminders
• Invoice creation and expense tracking
• Payment processing available
• Basic reporting

Best for: Early-stage agencies that need free outstanding invoice tracking with basic reminders

Pricing: Free plan available. Transaction fees apply for payment processing.

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6. Zoho Invoice

Zoho Invoice provides an accounts receivable dashboard and automated payment reminders as part of its broader invoicing platform. It is most useful for agencies already using the Zoho suite, where it connects natively with Zoho CRM and Zoho Books.

As a standalone outstanding invoice tracking tool, Zoho Invoice is capable but not specialized. Reminders go out from Zoho rather than the user's email and there is no dedicated follow-up logging or payment promise tracking.

Key features:

• Invoice tracking and automated reminders
• Time tracking and expense management
• Client portal
• Zoho suite integration
• Free for up to 5 clients

Best for: Agencies in the Zoho ecosystem needing integrated invoice tracking

Pricing: Free for up to 5 clients. Paid plans from $15/month.

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7. Bill.com

Bill.com is an accounts payable and receivable automation platform designed for businesses processing higher invoice volumes. It provides a detailed accounts receivable dashboard, approval workflows, and automated reminders.

Bill.com is well suited to agencies that have grown beyond the point where one person is manually managing follow-ups, but it is expensive and complex for smaller teams. Its strength is in processing volume and workflow automation at scale.

Key features:

• Accounts payable and receivable automation
• Detailed AR dashboard and aging reports
• Automated payment reminders
• Approval workflows
• QuickBooks and Xero integration

Best for: Agencies with higher invoice volumes that need workflow automation and detailed AR reporting

Pricing: From $39/month

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8. Invoice Ninja

Invoice Ninja is a free and open-source invoicing platform with a functional outstanding invoice dashboard and automated reminder system. It supports multiple payment gateways and recurring billing, making it useful for agencies with subscription-based clients.

The self-hosted option gives technical users full control over their data. For non-technical agency owners, the setup complexity and limited support are barriers. Collections features are basic.

Key features:

• Free and open-source
• Outstanding invoice dashboard
• Automated reminders
• Recurring billing
• Multiple payment gateway integrations
• Self-hosting available

Best for: Technical agency owners who want free, customizable invoice tracking

Pricing: Free plan available. Paid plans from $10/month.

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9. HoneyBook

HoneyBook is a client management platform for creative freelancers and small agencies. It combines proposals, contracts, invoicing, and payment collection in a single workflow. Its outstanding invoice tracking is built into the client pipeline view, giving a project-level view of payment status across active clients.

HoneyBook is better suited to agencies managing the full client lifecycle than those specifically looking for collections depth. Automated reminders are available but follow-up logging and payment promise tracking are not.

Key features:

• Client pipeline with payment status view
• Proposals, contracts, and invoicing in one workflow
• Automated payment reminders and schedules
• Client portal and communication tools
• QuickBooks integration

Best for: Creative agencies wanting a full client lifecycle tool with invoice tracking built in

Pricing: From $16/month

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10. Bonsai

Bonsai is a freelancer-focused platform that covers contracts, invoicing, time tracking, and payment collection. Its outstanding invoice dashboard shows unpaid and overdue invoices with a clear aging view. Automated reminders help reduce manual follow-up effort.

Bonsai is stronger for solo freelancers than for agencies managing multiple clients. Its collections features are basic and there is no dedicated workflow for tracking follow-up conversations, payment promises, or partial payment agreements.

Key features:

• Outstanding invoice dashboard with aging view
• Automated payment reminders
• Contracts and proposals
• Time tracking
• Client portal

Best for: Solo freelancers wanting a combined contract, invoicing, and basic payment tracking tool

Pricing: From $17/month

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Quick Comparison

Tool	Outstanding invoice view	Follow-up tracking	Payment promises	Pricing
Duely	Yes	Yes	Yes	$29/mo
QuickBooks	Yes	Basic	No	From $25/mo
Xero	Yes	Basic	No	From $13/mo
FreshBooks	Yes	Basic	No	From $6/mo
Wave	Yes	Basic	No	Free
Zoho Invoice	Yes	Basic	No	Free to $15/mo
Bill.com	Yes	Medium	No	From $39/mo
Invoice Ninja	Yes	Basic	No	Free
HoneyBook	Yes	Basic	No	From $16/mo
Bonsai	Yes	Basic	No	From $17/mo

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Which tool is right for your agency?

If your main problem is staying organized across follow-ups with multiple clients: Duely is the only tool on this list that tracks payment promises, logs follow-up conversations, and gives you a full timeline per client. Every other tool shows you the invoice status but does not help you manage what happens next.

If you need full accounting alongside invoice tracking: QuickBooks for the most comprehensive platform, Xero if you prefer a cleaner interface or operate in the UK or Australia.

If you need to reduce costs: Wave handles the basics for free. Invoice Ninja is free and more customizable for technical users.

If you manage the full client lifecycle: HoneyBook or Bonsai cover proposals through payment in one workflow, suited better to solo freelancers than to agencies with multiple team members.

The most common setup for small agencies that have a real collections problem is using an accounting platform for the books and Duely for the follow-up workflow. The QuickBooks and Xero integrations mean invoices sync automatically and reminders stop the moment payment is recorded.

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FAQ

What is the difference between an outstanding invoice and an overdue invoice?

An outstanding invoice is any invoice that has not yet been paid, regardless of whether it has passed the due date. An overdue invoice is one that remains unpaid after the agreed payment due date. All overdue invoices are outstanding, but not all outstanding invoices are overdue.

How do I track outstanding invoices without accounting software?

Duely tracks outstanding invoices, follow-up history, payment promises, and partial payments without requiring a full accounting system. It integrates with QuickBooks, Xero, and Stripe but can also be used independently. A spreadsheet is another option but breaks down quickly as client count grows.

Is Duely free?

Duely is not free. It costs $29 per month with a 14-day free trial and no credit card required to start. There is no free plan.

How often should I follow up on an outstanding invoice?

A standard collections cadence for small agencies is to follow up 3 days after the due date with a friendly reminder, then every 5 to 7 days with increasing firmness if there is no response. After 30 days overdue, following up every 3 to 5 business days is reasonable. Consistency is more important than frequency.

What should I do if a client ignores all invoice reminders?

Send a final formal notice referencing all prior follow-up attempts. Pause ongoing work if the relationship allows it. Document every communication attempt in case escalation to legal or a collections agency becomes necessary. Duely's final notice tone is designed for this stage and logs all prior communication automatically.

Can I track partial payments on outstanding invoices?

Yes. Duely allows partial payments to be logged against outstanding invoices, showing the remaining balance and updating the client timeline accordingly. QuickBooks and Xero also support partial payment recording as part of their accounting functions.

Track overdue invoices, payment promises, and follow-ups more systematically with Duely.