Average time freelancers spend on billing admin — tracking, invoicing, following up — when using separate tools. Combined tools cut this to under an hour.
Why Separate Apps Are Costing You Money
The two-app problem is real. You track time in Toggl or Clockify, then export to CSV, then rebuild the math in a Word template or Wave invoice. Every month. This isn't just tedious — it creates billing errors:
- Copy-paste mistakes — a transposed digit turns $1,250 into $1,520
- Forgotten entries — you export on the 30th but forgot about that session on the 28th
- Rate calculation errors — you multiply hours manually and miss a decimal
- Late invoices — the friction makes you delay sending, which delays payment
Research shows freelancers who invoice within 24 hours of project completion get paid 3× faster than those who batch invoices monthly. The tool friction is costing you cash flow.
The Ideal Freelance Billing Workflow
The right workflow runs like this — all in one tool:
Start the timer when work begins
One click. No app-switching, no manual note-taking. The clock starts when you do. Tag it with client, project, and whether it's billable.
Add a description as you go
"Homepage redesign — hero section and mobile nav." This becomes the line item on the invoice. Specific descriptions reduce client disputes and "what did you actually do?" emails.
Stop the timer when done
The entry logs automatically with the exact duration. No rounding, no guessing, no "I think I worked about 3 hours on that."
Review weekly (5 minutes)
Open your timesheet. Scan for anything you forgot to start/stop. Manual entries take 30 seconds. Weekly review beats monthly panic.
Select entries → generate invoice
At billing time, select the tracked entries for that client and period. The tool calculates totals automatically: hours × rate = amount due. Generate the PDF. Send.
Track invoice status
Mark as Sent, then Paid when payment arrives. Your billing history is clean, searchable, and auditable. If a client disputes an invoice, your time entries are the proof.
TimeApp does all 6 steps in one place
Free plan includes invoicing. No credit card, no upgrade required.
Start Free →What a Good Freelance Invoice Generator Includes
Not all invoice tools are equal. Here's what matters for freelancers who track time:
Auto-calculation from time entries
You should never multiply hours × rate manually. The tool knows your rate per client. When you select tracked entries, it calculates the total. Math errors drop to zero.
Line items with descriptions
Each time entry becomes a line item: "Homepage redesign — hero section | 2.5 hrs × $85/hr = $212.50." Your client sees exactly what they're paying for. Disputes drop by ~70% compared to lump-sum invoices.
Per-client billing rates
If you charge Client A $75/hr and Client B $120/hr, the tool needs to know this. Manually adjusting rates every time you generate an invoice is where errors sneak in.
PDF download (or direct send)
Clients pay faster when the invoice is professional and easy to forward to their accounting team. PDF is the universal format — every accounting software accepts it.
Invoice status tracking
Draft → Sent → Paid. You need to know at a glance what's outstanding, what's been paid, and what needs a follow-up email.
Tools That Combine Time Tracking + Invoicing
| Tool | Free Tier Invoicing | Invoice from Time Entries | Price |
|---|---|---|---|
| TimeApp | ✓ Yes | ✓ Yes | Free / $9/mo Pro |
| Harvest | ✗ (1 project only) | ✓ Yes | $12/mo |
| FreshBooks | ✗ | ✓ Yes | $17/mo |
| Clockify | ✗ | ✓ (paid plans) | $6.99/mo |
| Toggl Track | ✗ | ✗ (export only) | Free / $9/mo |
| Wave | ✓ (invoicing only) | ✗ (no time tracking) | Free |
TimeApp is the only tool in this list that offers free invoicing generated from time entries. Wave has free invoicing but no time tracking. Harvest has both but requires a paid plan. FreshBooks is excellent but starts at $17/month for a solo freelancer.
Setting Up Your Billing System in TimeApp
Step 1: Create one project per client engagement
Not one project per client — one project per engagement. "Acme Corp – Website Redesign" and "Acme Corp – Monthly Retainer" are separate projects. This keeps invoice line items clean and prevents billing confusion.
Step 2: Set hourly rates at the project level
TimeApp lets you set a billing rate per project. Client A's rate lives in their project — you never have to remember it. When you generate an invoice, the math is already done.
Step 3: Tag every entry as billable or non-billable
Billable: design work, development, writing, revisions. Non-billable: sales calls, project scoping, internal meetings. Tagging as you go prevents the "wait, did I charge for that?" panic.
Pro tip: If you're unsure whether something is billable, mark it billable and decide when you review. It's easier to remove a line item from an invoice than to remember to add one.
Step 4: Invoice at the end of each project (or monthly)
For project-based work: invoice when you hit a milestone or complete the project. For retainer clients: invoice on the same day every month (e.g., the 1st). Consistent invoicing = consistent cash flow.
Step 5: Set "Net 14" payment terms by default
Most freelancers use Net 30 by default. Switch to Net 14. Clients pay in the window you set — and Net 14 clients pay 2 weeks faster than Net 30 clients without significant pushback.
What to Include on a Freelance Invoice
A good invoice prevents follow-up emails and payment delays:
- Your name or business name (clients need to know who to pay)
- Invoice number (INV-0042 — unique and sequential)
- Invoice date and due date
- Client name and contact
- Line items with descriptions, hours, rate, and subtotal per item
- Total amount due (can't be buried or ambiguous)
- Payment method instructions (bank transfer details, PayPal, etc.)
- Short "thank you" note (optional, but it pays off in client goodwill)
TimeApp's invoice generator fills in all of this automatically from your tracked entries and client details. What used to take 20 minutes takes 90 seconds.
The Revenue Math: Why This Actually Matters
Let's say you're billing $80/hour and forget to track 2 hours per week:
- 2 hours/week × $80 = $160/week lost
- $160 × 50 working weeks = $8,000/year left on the table
Most freelancers don't lose 2 hours a week consciously — they lose it to rounding down ("I'll say it was 1.5 hours, not 1.75") and forgetting short sessions ("that email exchange took 20 minutes but I didn't start the timer").
A proper time tracking + invoicing system doesn't just save admin time. It directly recovers revenue you're already earning but not charging for.
Track time and invoice clients in one app
Free plan includes invoicing — no credit card, no trial limits on core features.
Start Free → Billable Hours GuideTrack time smarter. Try TimeApp free.
No surveillance, no lock-in. Just accurate hours and clean invoices.