How to Track Time When Multiple Clients Are Involved in One Project

When One Project Has Two Clients

It happens more than people talk about. A client brings you in to work with their client. Or two companies are co-funding a project. Or one client owns the strategy and another owns the execution budget.

However it happens, you now have one body of work and two billing relationships. Standard project setup does not cover this cleanly. You need a different approach before you log a single hour.

The Setup Problem

If you create one project and track everything there, you will eventually need to split the hours. You will do that from memory, which means you will get it wrong. Or you will spend an hour reviewing notes to figure out which work belonged to which client.

The fix is to decide upfront how the split works and build it into your tracker from day one.

Option One: Separate Projects, Same Tags

Create two separate projects in Time-Trak, one per client. Use consistent task names across both so your reports are readable later.

When you start a session, you pick the client you are billing that hour to. This works well when the two clients have genuinely separate scopes of work that happen to intersect.

The downside is that you have to be deliberate about which timer you start. If you are on a call with both clients, you need a rule for how to handle it. Pick one client and note it. Do not split a single session across two projects unless your tracker supports it directly.

Option Two: One Project, Split Rate Categories

If the work is genuinely shared and both clients are billed proportionally, set up one project with separate billing categories that map to each client.

Tag each session with the category before you stop the timer. Then when you generate a report, you filter by category to pull each client's portion.

This only works if your split is stable. If Client A covers 60 percent and Client B covers 40 percent of everything, this is clean. If the split shifts depending on the task, use separate projects.

What to Do With Shared Work

Some tasks genuinely belong to both clients. A kickoff call. A shared document. A review session.

You have two options. Bill one client for it by prior agreement, or split it and round each portion to your minimum billing increment. Do not try to track four minutes to one client and six minutes to another. That level of precision creates friction without adding accuracy.

Decide before the project starts which client owns the shared overhead. Write it in the project notes. Then follow it.

Communication Time Is the Sneaky One

When you are on a call with both clients, whose time is it? When you write an update email that goes to both, who gets billed?

This is where projects with multiple clients get messy fast. The answer is not universal. But the approach is. Create a communication category in your tracker and log it separately. At billing time, you have real data and a clear record. You can make a judgment call with receipts instead of guessing.

Time-Trak lets you add notes to individual time entries. Use them here. One line about who the communication was with makes the billing decision much easier two weeks later.

Before You Invoice

Run a report for each client before you generate an invoice. Review the line items. Make sure nothing crossed over that should not have. This takes five minutes and saves the conversation where a client questions a charge that was genuinely meant for someone else.

Multiple clients on one project is not a rare edge case. It is just a setup problem that most time trackers make you solve manually. Solve it before the project starts and your billing will stay clean throughout.

Track your time, bill every minute.

Time-Trak is a native Mac and Windows time tracker with a floating timer, automatic screenshots, and one-click invoicing.

Free during beta.

macOS + Windows · Floating widget · Auto screenshots