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How to Track Project Hours for Billing — IT and Services Guide

Zaffre HRM Team · May 30, 2026

For service businesses — IT, consulting, legal, design, marketing — project hour tracking is the difference between profit and loss per client. Tracked badly, you under-bill (revenue loss) or over-bill (client dispute). Tracked well, you have honest billing, project profitability visibility, and capacity-planning data. Here is the practical setup.

What "tracking project hours" actually requires

1. Project structure

Each project: name, client, start date, end date (or "ongoing"), budget (hours and/or fee), team members, billing model (T&M, fixed fee, retainer).

2. Task structure within projects

Tasks within a project for granular tracking. "Backend development - sprint 12 - feature X" rather than "work on Project A." Granularity supports both billing detail and capacity analysis.

3. Billable vs non-billable distinction

Internal meetings, training, sales work — non-billable. Client-facing work, project deliverables — billable. The system should support both, billing only the billable hours.

4. Time entry — by employee, per day

Daily, employees log their hours per task. Tomorrow's memory is not yesterday's accuracy.

5. Approval workflow

Manager / project lead approves time entries weekly or monthly before invoicing.

6. Billing data export

Approved billable hours export to invoicing — by client, by project, by task. Invoice generated.

7. Project profitability view

Hours invested (billable + non-billable) × cost rate vs project revenue = profitability. Live, per project.

The two big tracking patterns

Time-block tracking

Employee enters time blocks at end of day — 9-11 Project A task 1, 11-12 internal meeting, 1-3 Project B task 2, etc. Accurate, requires discipline.

Timer-based tracking

Start timer when beginning a task, stop when done. Switch tasks → switch timer. More accurate (no end-of-day reconstruction) but requires the employee to remember to switch.

Most modern tools support both. Best practice: timer-driven during work, end-of-day review to clean up.

What goes wrong

"I'll fill it on Friday"

Friday's memory of Monday's work is approximate at best. Daily entry is non-negotiable. Make it 30 seconds via mobile if necessary.

"This task fits one of these 50 task codes... I'll pick one"

Too many task codes → employees pick the nearest match, breaking analysis. Keep task taxonomy lean. Add codes as needed.

Non-billable hidden as billable

Internal sprint planning billed to the client. Once the client notices, trust is gone. Discipline on what counts as billable matters.

Billable hidden as non-billable

Employee helps a client urgently outside the contract scope, doesn't track. Bill never sent. Lost revenue.

No client-facing report

Client receives an invoice with a single line "consulting services - PKR X". They want detail. Provide task-level breakdown.

The integration that matters

With HR / employee records

Time entries roll up to the employee's record. Total billable hours per month per employee — visible for performance and utilisation analysis.

With attendance

Time entries and attendance should agree on total hours. If they don't, one is wrong.

With payroll

For per-hour-paid contractors, time entries × rate = payroll. For salaried staff, time entries inform performance not pay.

With invoicing

Approved billable hours export to invoicing tool / module. Invoice generated automatically.

The Pakistani IT services pattern

For Lahore / Islamabad / Karachi software houses, the typical setup:

  • Multiple offshore clients with different billing models
  • Mix of salaried employees + offshore-paid contractors
  • Dual currency (PKR for local salaries, USD for client billing)
  • Sprint / scrum structure for projects

The time tracking system must handle all of this in one place, integrated with HR + payroll + attendance.

The Zaffre HRM project tracking fit

Zaffre HRM includes project management with time tracking integrated with HR, attendance and payroll. Project + task structure, billable / non-billable, approval workflow, billing data export. See: IT services HR guide.

Book a demo for project hour tracking setup.