What are the best time tracking and billing software for consultants

TL;DR: Tracking billable hours is only half the job. You still need to apply the right rates, prepare accurate invoices, and make sure clients pay on time. The best time tracking and billing software for consultants connects these steps so fewer hours are missed and less time is spent on administration. This guide compares seven tools based on time tracking, project billing, invoicing, and how well they fit different consulting businesses.

What makes a billing tool right for consultants

Consultants don't bill the same way as most other businesses. A retail business sells products. A consultant usually sells expertise, time, or a specific project outcome. That makes billing a little more complicated. Imagine you're an IT consultant working with three clients. One pays by the hour, another has a fixed monthly retainer, and the third pays when specific project milestones are completed.

You can't always use the same invoice format or billing schedule for all three. And if you're tracking hours in one tool and preparing invoices somewhere else, it's easy to miss something. Maybe you forget to include two hours spent troubleshooting a client's issue. Or you apply the wrong hourly rate. Sometimes the invoice simply goes out late because nobody has reviewed the timesheet. That's why choosing the right billing software for consultants matters.

A good platform should help you record work, organise it by client or project, apply the correct rates, and prepare invoices without rebuilding the same information every month. For consulting firms, there's another consideration: multiple people may be working on the same client engagement. You may need managers to approve hours, track project budgets, and review invoices before they go out. The best time and billing software for consultants should support how you actually charge clients, whether that's hourly, fixed-fee, milestone-based, or recurring billing.

Features to look for before you buy

Not every feature advertised by a billing platform will matter to your consulting business. Some tools are excellent for tracking hours but offer limited invoicing. Others manage invoices well but depend on a separate application for time tracking.

Before choosing, focus on these five features.

1. Time Tracking That Connects to Invoicing

This is one of the most important features for hourly consultants. Your time entries should be associated with a client, project, or task. When it's time to invoice, you should be able to use those records without manually copying every hour into a new document. For example, if you log 18 billable hours for a client during the week, the software should help turn those records into an accurate billing statement. Check whether that conversion happens automatically, requires approval, or involves importing a time report. These differences matter when you're billing multiple clients every month.

2. Support for Different Billing Models

Not every consulting engagement is billed hourly.

You may also charge:

• Fixed fees for specific projects

• Milestone payments for completed deliverables

• Monthly retainers for ongoing support

• Different hourly rates for different team members

The right time tracking and billing software for consultants should support your billing arrangements without complicated workarounds. A platform designed for simple hourly billing may not be the best option for a firm managing several types of client contracts.

3. Timesheet Review and Approval

When you're working alone, reviewing your time entries is relatively straightforward. Once you have a consulting team, someone may need to check whether the hours are accurate before the customer receives an invoice. A proper approval process helps identify missing entries, incorrect project codes, or work that shouldn't be billed. This is particularly useful for firms managing several consultants across different clients.

4. Multiple Billing Rates and Currencies

A senior consultant may charge $150 per hour, while a junior consultant charges $75. Some clients may have negotiated different rates, and international customers may be billed in different currencies. Your billing software should make these arrangements easy to manage. Otherwise, someone ends up correcting invoice amounts manually every billing cycle.

5. Payment Tracking and Follow-Ups

Creating an invoice doesn't mean the job is finished. You still need to know whether it was sent, when payment is due, and whether the client has paid. Look for invoice status tracking, payment reminders, partial payment handling, and reporting on overdue invoices. These features are especially useful when you're managing recurring consulting engagements. The goal is simple: fewer missing hours, fewer invoice corrections, and a clearer picture of what clients owe.

7 best time tracking and billing tools for consultants in 2026

Not every tool on this list approaches consulting billing in the same way. Some focus on capturing time accurately. Others connect timesheets directly to invoices, while a few are designed around project-based billing and financial management.

Here's how the seven options compare.

1. Inzo (Worksbuddy) – Best for Consulting Firms Managing Project-Based Billing

For consulting businesses, the gap between completing work and sending an invoice can create unnecessary delays. A project milestone gets approved, but finance still needs to collect the billing information, check the contract, and prepare the invoice. When several projects are running at once, those handoffs become difficult to manage.

Inzo by Worksbuddy is an AI-powered invoicing and financial management agent designed to help businesses manage invoices, payments, recurring billing, and financial records. Its main advantage for consulting firms is its connection with the wider WorksBuddy ecosystem. For example, consultants can manage project tasks and time records in Taro. When a billable milestone is completed, a configured workflow can create a draft invoice in Inzo using the project's billing details.

Inzo also connects with other Worksbuddy agents, including Lio for CRM workflows and Sigi for signed agreements. That makes it useful for consulting firms where billing depends on project progress, contracts, or recurring customer work. Inzo is primarily the billing part of this setup. Consultants looking for time tracking alongside invoicing should evaluate Taro and Inzo together rather than treating Inzo as a standalone time tracker.

Key features:

• Invoice creation, sending, and payment tracking

• Recurring billing and payment reminders

• Project milestone-based invoice automation

• Partial payment and overdue invoice management

• AI-assisted financial insights and cash flow forecasting

• Integration with Taro and other WorksBuddy agents

What works well: Connects project delivery with invoicing and helps reduce manual handoffs between operations and finance.

What to consider: Time tracking is handled through connected project workflows rather than Inzo itself. Consulting firms needing detailed timesheet-to-invoice conversion should confirm that their required workflow is supported.

Best for: IT consulting firms, project-based agencies, and service businesses that want connected project management and billing.

Pricing: Check current Worksbuddy Inzo pricing plans.

2. BigTime – Best for Consulting Firms Managing Multiple Billable Employees

Once a consulting firm grows beyond a few people, billing becomes more than adding up hours. You need to know who's working on each engagement, whether their time is billable, and whether the hours have been approved.

BigTime is designed around these requirements. It's a professional services automation platform that combines time tracking, project budgeting, billing, and financial reporting. For example, imagine a consulting firm with 15 employees working on several client projects. Each consultant records their hours, but the project manager needs to review those records before finance prepares invoices.

BigTime supports timesheet approval workflows, helping firms review billable work before it reaches customers. It also supports project-based billing and financial visibility, which can be useful when managing larger engagements.

Key features:

• Timesheets and expense tracking

• Project-based billing

• Billing rates and project budgets

• Timesheet approval workflows

• Work-in-progress reporting

• Professional services reporting

What works well: Strong fit for consulting firms that need structured timesheet approvals and control over project billing.

What to consider: May be more complex than necessary for freelancers or very small consulting businesses.

Best for: Growing consulting firms and professional service companies managing several billable employees.

Pricing: Available through BigTime's current plans.

3. Harvest – Best for Consultants Who Bill Clients by the Hour

For many consultants, the process is straightforward. You work on a client project, track the hours, and send an invoice at the end of the billing period.

Harvest is built to make that process easier. It combines time tracking, expense tracking, invoicing, and payment-related features. Let's say you spent 12 hours on one client's project and 20 hours on another. Instead of preparing invoices from separate spreadsheets, you can use Harvest's time records to create invoices for the appropriate clients. The platform can turn tracked billable hours and expenses into invoice line items, reducing the need to enter the same information again. Harvest also supports payment integrations and reporting, making it useful for service businesses with straightforward billing arrangements.

Key features:

• Time tracking by project and client

• Billable and non-billable hours

• Invoice creation from timesheets

• Expense tracking

• Online payment integrations

• Project budget reporting

What works well: Keeps time tracking and invoicing closely connected, making it practical for hourly consulting work.

What to consider: Firms with complex approval structures or advanced project management requirements may need additional software.

Best for: Freelancers, independent consultants, and small consulting teams billing primarily by the hour.

Pricing: Free and paid plans available.

4. Toggl Track – Best for Consultants Who Want Simple Time Tracking

Sometimes, the biggest problem isn't invoicing. It's remembering how much time you actually spent working. You start answering a client's question, move into troubleshooting, attend a meeting, and suddenly two hours have passed without being recorded.

Toggl Track helps solve that problem. It's a time tracking platform with an easy-to-use timer, client and project categorisation, billable rates, and detailed reports. Consultants can record their time as they work and review the billable totals later. For example, a freelancer working across five clients can generate separate time reports showing how many hours were spent on each engagement. Those reports can then be used to prepare invoices in another application. Toggl is particularly useful when you want accurate time records but already have an invoicing system you're comfortable using.

Key features:

• One-click time tracking

• Client and project categorisation

• Billable rates

• Time reports and exports

• Project budgets and alerts

• Timesheet approval features

What works well: Simple time capture and useful reporting without a complicated setup.

What to consider: Invoice creation generally requires exporting data or using another invoicing tool.

Best for: Solo consultants and small teams that prioritise tracking their billable hours accurately.

Pricing: Free and paid plans available.

5. FreshBooks – Best for Independent Consultants and Small Firms

Running a consulting business often means handling everything yourself. You manage clients, track work, prepare invoices, and follow up on payments.

FreshBooks brings many of those activities together. It's an accounting and invoicing platform designed for freelancers and small service businesses. Alongside invoice creation, it offers time tracking, expense management, recurring billing, and payment reminders. For example, a marketing consultant can track hours spent on client work, prepare an invoice, and monitor whether the customer has paid. Having those activities in one application makes it easier to manage the billing cycle without relying on multiple spreadsheets. FreshBooks is particularly appealing to consultants who want a familiar, straightforward interface.

Key features:

• Time tracking

• Project-based invoicing

• Recurring invoices

• Expense management

• Payment reminders

• Client billing and reporting

What works well: Covers many everyday billing needs in one platform and is relatively easy to get started with.

What to consider: Larger consulting firms may need more detailed project financial controls and approval workflows.

Best for: Independent consultants, freelancers, and small professional services firms.

Pricing: Paid subscription plans available.

6. QuickBooks Time – Best for Consultants Already Using QuickBooks

If your consulting business already uses QuickBooks for accounting, adding another disconnected time tracking application may not make sense.

QuickBooks Time is designed to work within the QuickBooks ecosystem. It helps businesses record employee hours, manage timesheets, and connect time data with supported accounting and payroll workflows. For consulting firms, this can be useful when billable time needs to flow into an existing financial system. For example, a small consulting company can use QuickBooks Time to record hours and then manage the related billing through its compatible QuickBooks setup. It also provides workforce tracking features, which may be useful for firms with employees working at customer locations. However, it's important to check which invoicing and time-related functions are included in your QuickBooks plan.

Key features:

• Employee time tracking

• Timesheets

• Project and customer time records

• Mobile time tracking

• QuickBooks integration

• Scheduling and workforce features

What works well: Convenient for businesses already using QuickBooks for accounting or payroll.

What to consider: The complete time-to-invoice workflow depends on the connected QuickBooks products and subscription.

Best for: Consulting firms using QuickBooks that want to keep time tracking and financial records within the same ecosystem.

Pricing: Depends on the selected QuickBooks products and plans.

7. Clockify – Best for Budget-Conscious Consultants

If you're starting a consulting business, you may not want to spend much on software before you have a steady flow of clients.

Clockify offers a practical starting point. It provides time tracking, project records, timesheets, and reports, with a free plan for core tracking needs. Consultants can record hours against different clients and projects, then review how much time they've spent on billable work. Clockify also supports invoicing from tracked time and expenses on eligible paid plans. That means businesses can start with basic time tracking and add more billing features as their needs grow. For example, a small consulting team can use Clockify to track work across several client projects and generate reports before preparing invoices.

Key features:

• Time tracking and timesheets

• Project and client categorisation

• Billable rates

• Time reports

• Invoice creation on eligible paid plans

• Expense tracking and project budgets

What works well: Accessible starting point for consultants who want structured time records without high initial costs.

What to consider: Invoice generation and more advanced management features require paid plans.

Best for: New consultants, freelancers, and small teams looking for affordable time tracking and billing software.

Pricing: Free plan available; invoicing is included in eligible paid plans.

How to compare these tools side by side

Four dimensions separate useful billing software for consulting firms from tools that just track hours: project-based billing, automated invoice generation, a client-facing portal, and AI assistance. Here's how the seven tools stack up.

The main difference is how each product moves information from recorded work to a billable invoice. Harvest is useful when consultants want to turn timesheets into invoices directly. BigTime is more suitable when timesheets need approval and consulting projects have different billing arrangements.

Toggl Track works well for consultants who primarily need accurate time records. Inzo and Taro are worth considering when project progress and billing milestones need to be connected. For consulting firms managing several clients, the important question isn't just whether a platform tracks time.

It's whether the billing process still requires someone to copy, calculate, or verify information manually every month.

How to automate invoicing from your time logs

Here's a common situation. Your consulting team finishes the month with dozens of time entries across different clients. The hours are recorded, but someone still needs to prepare the invoices. They open the time tracking application, export a report, apply the correct rates, and transfer the numbers to an invoice template. That's where mistakes happen. A better time and billing workflow connects the information from the beginning.

Step 1: Record Time Against the Right Client and Project

Every time entry should include enough information to identify what the work was for. That usually means the client, project, task, date, and whether the work is billable.

For example:

When those records are accurate, preparing an invoice becomes much easier.

Step 2: Apply Billing Rules and Generate the Invoice

The software should apply the relevant billing rates and use the approved time entries. For hourly consulting, that may mean generating an invoice from tracked hours. For milestone-based work, it may mean creating a draft invoice when a deliverable is completed. These are different workflows. Harvest supports invoicing from timesheets, while Inzo can generate milestone-based invoices through connected Taro project workflows. Choose the setup that matches how your consulting business charges clients.

Step 3: Review and Send the Invoice

Before sending, check that the invoice includes the correct client details, service descriptions, hours or milestone amounts, taxes, and payment terms. Some consulting firms require manager approval before an invoice is sent. Once approved, send it through the billing platform or connected delivery method.

Step 4: Track Payments and Follow Up

The billing process doesn't end when the invoice is sent. You still need to know whether the customer has paid in full, made a partial payment, or missed the due date. Software with payment status tracking and reminders can make those follow-ups easier. The purpose of automating this workflow isn't to remove every review step. It's to stop entering the same information repeatedly and reduce the chances of missing billable work.

How to choose the right tool for your consulting business

There's no single platform that's right for every consultant. A freelancer billing five clients each month has different needs from an IT consulting firm managing several teams and dozens of ongoing engagements.

Four questions will help narrow your choice.

1. How do you charge clients?

If you bill hourly, prioritise accurate time tracking, billable rates, and timesheet-to-invoice conversion. If you use fixed-fee contracts or project milestones, look for software that connects billing to project deliverables. If you charge monthly retainers, recurring billing and payment reminders become more important.

2. How many clients and projects are you managing?

For a handful of clients, a simple time tracker and invoicing platform may be enough. As the number of engagements grows, client-level reporting, invoice history, and billing controls become more important.

3. How much manual work happens between tracking time and sending invoices?

This is worth examining closely. If your team has to copy hours between applications every month, you're adding time and increasing the chances of billing errors. Look for software that can use recorded time or project information directly in the invoicing process.

4. How many people need to approve billable work?

A solo consultant may only need to review their own entries. A consulting firm with several employees may require managers to approve timesheets and finance staff to review invoices. Make sure the platform supports the level of control your business needs. Before committing to a subscription, test the software with one actual client engagement. Track time, apply your billing rates, prepare an invoice, and check how easily the payment can be recorded.

You'll quickly see whether the tool simplifies the process or just gives you another application to manage.

Stop Losing Billable Hours Between Your Time Tracker and Your Invoice

For consultants, time is directly connected to revenue. Every billable hour needs to be recorded, every invoice needs to be accurate, and every outstanding payment needs attention. But that doesn't mean every consultant needs complicated software.

If you're working independently and billing a few clients, a straightforward platform such as Harvest, FreshBooks, or Clockify may cover your requirements. If your firm manages detailed timesheets and approval workflows, BigTime is worth evaluating. And if your billing depends on project milestones, client contracts, and connected business workflows, Inzo and Taro can help bring project delivery and invoicing closer together.

The important part is what happens between completing the work and sending the invoice. If your team is still rebuilding billing information every month, that's the first process worth improving. The best time tracking and billing software for consultants should help you spend less time preparing invoices and more time delivering the work clients pay you for.