How to Track Time When One Project Involves More Than One Client

When One Project Has Two Bosses

You have been hired by Company A to build something that Company B will also use. Or you are working with an agency and their end client. Or two founders from different businesses are splitting the cost of a project.

Whatever the arrangement, the billing structure is split but the work is unified. You cannot always separate the hours cleanly because a single meeting or a single deliverable serves both parties.

This is one of the situations where time tracking setups that work fine for single-client work quietly fall apart.

The First Question: Who Gets the Invoice?

Before you set anything up, be clear on who is paying you and in what proportion. If Company A covers sixty percent and Company B covers forty, you need to know that before you log a single hour.

Get this in writing. Not because clients are dishonest but because split billing arrangements are easy to misremember six weeks in when everyone is busy and the original conversation has faded.

Once you have the split confirmed, you can set up your tracker to reflect it.

Setting Up the Project Structure in Time-Trak

The cleanest way to handle this is to create one project per billing party, even if the work is shared.

So you create a project for Client A and a project for Client B. When you log hours, you log to whichever client the work most directly serves. A call where both clients are present gets split proportionally across both projects, even if that means logging thirty minutes to each.

This keeps your invoices clean. When you are ready to invoice Client A, you pull from their project. Client B gets their own invoice from their own project. No mixing, no manual calculations at the end.

What to Do When Work Cannot Be Split Cleanly

Some hours genuinely cannot be allocated to one client over another. A strategy meeting that shapes the entire project. Research that informs decisions for both parties.

For these, you have a few options.

One is to log the full time to a shared overhead project and divide it manually when invoicing. The other is to agree upfront with both clients that certain categories of work will be split evenly, and document that assumption.

The option that causes the most trouble is ignoring the question and logging everything to whichever project you happened to have open. That creates discrepancies that are painful to untangle.

Naming Conventions Save You in Client Reports

When both clients can see reports, your entry labels need to be clear enough that neither party is confused about what they are being billed for.

Avoid generic entries like "meeting" or "work session." Use labels that describe what was done and why it was billed to that client. "Strategy call, Client A deliverables" is better than "call." It takes five more seconds to type and saves you a twenty-minute conversation when the invoice arrives.

In Time-Trak, the entries you write now become the line items on the invoice. Clean labels mean the invoice explains itself. That matters more when clients are splitting a bill and each one is looking closely at their share.

Running the Final Check Before Invoicing

Before you send any invoice in a split project, run the totals for both clients side by side. Check that the split matches your original agreement. Check that hours are not double-logged, meaning the same entry does not appear in both projects.

Also check that the total across both projects reflects the real hours you worked. If you logged twenty hours in total but the two projects only add up to sixteen, four hours went somewhere else or nowhere at all.

Split billing is not complicated once the system is set up right. The problem is almost always that the system was never set up at all and someone tried to figure it out at invoice time.

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