How to effectively link your tracked hours to your invoice to avoid disputes with clients.

Invoice Based on Tracked Hours

For hourly billing, invoice clarity is critical. Clients need to see exactly what they're paying for and how many hours you worked.

Format: Weekly/Monthly Timesheet Summary

INVOICE

Consulting Services (May 2026)

Week 1: 22-26 May
Monday 8 hours, Tuesday 8 hours, Wednesday 6 hours, Thursday 8 hours = 30 hours
Friday: Public holiday (not billed)

Week 2: 29 May - 2 June
Monday 8 hours, Tuesday 8 hours, Wednesday 8 hours, Thursday: Client meeting (4 hours)

Total Hours: 38 hours
Rate: £75/hour
Subtotal: £2,850
VAT @ 20%: £570
TOTAL: £3,420

Attach Detailed Timesheet

Include a PDF attachment showing daily breakdown:

Date        Task Description              Hours  Rate    Total
────────────────────────────────────────────────────────────
22 May      Strategy session              8      £75     £600
23 May      Implementation work           8      £75     £600
24 May      Documentation & review       6      £75     £450
25 May      Client meeting + reporting   8      £75     £600
29 May      Development work             8      £75     £600
30 May      Testing & refinement         8      £75     £600
31 May      Finalisation                 8      £75     £600
1 June      Client handover/training     4      £75     £300

TOTAL:      58 hours                              £4,350

Common Mistakes

No detail ("Consulting: £3,000" with no hours breakdown)
Rounding hours (8.5 hours becomes 8)
Not matching hours to project (client can't verify)
Mixing different rates without clarity

FAQ

What if I worked 7.5 hours in a day?

Bill 7.5 hours. Many consultants bill in 0.5-hour increments (not whole hours only).

Should I disclose all my hours?

Yes. Transparency builds trust. If you worked 60 hours but only bill for 40, you're underselling.

Timesheet Invoicing: Best Practices for Hourly Consultants