For freelancers & consultants

Time Tracking & Invoicing for Freelancers: A Simple System

By Yufan Chen · 7 min read

Most freelancers don't undercharge because their rate is too low. They undercharge because tracking time is a chore — so hours go unrecorded, invoices get estimated "close enough," and real money quietly disappears every month.

It doesn't have to be that way. Here's a simple system for tracking billable time accurately and turning it into professional invoices, without spreadsheets or end-of-month dread.

The spreadsheet trap

A spreadsheet feels free, but it costs you in three ways. You forget to fill it in, so it's incomplete. You reconstruct hours from memory, so it's inaccurate. And at invoice time you copy, reformat, and total everything by hand, so it's slow. A good time tracking app removes all three: it captures time as you work, keeps it tied to the right client, and turns it into an invoice in seconds.

What good time tracking looks like for freelancers

• One tap to start. If logging time takes effort, you won't do it consistently. The whole game is low friction.
• Add time after the fact. You'll forget sometimes — so adding a past block in seconds matters as much as the live timer.
• Per-client and per-project rates. You don't charge everyone the same, and your tracker shouldn't assume you do.
• Billable vs. non-billable. Track the unbillable work too, so you can see where your week actually goes.

Hourly, fixed-fee, or a mix

Freelance work rarely fits one billing model. Some clients pay by the hour; others want a flat project fee; some want a discount. A good hourly billing app handles all three — per-project rates, fixed fees, and discounts — so every entry bills at the right amount without mental math. Tracking time still matters on fixed-fee work, too: it tells you whether your flat rate is actually profitable.

From tracked time to a paid invoice

The moment that decides whether you get paid on time is the handoff from "hours worked" to "invoice sent." If those live in different tools, every invoice is a small project. If they live together, it's a tap: your hours, your rates, your branding, totaled into a clean PDF you can send to the client directly.

Working with international clients

If you bill clients in more than one country, currency matters. Tally supports invoicing in US dollars (USD) and New Taiwan dollars (NTD), with a per-client override — handy when some clients pay in NT$ and others in $. The app is also fully available in English and Traditional Chinese.

How Tally puts it together

Tally is a calm, beautifully simple time tracker for freelancers and consultants. One tap to start; add time you forgot; organize everything by client and project with its own rate; then turn your hours into a branded PDF invoice and send it — all from one app that syncs across iPhone, Mac, and the web. It does the few things that matter, and it does them without the busywork.

Related: How to track billable hours as a lawyer