I’ve been using a combo of digital and paper that works pretty well for me:
For contracts, I have a filing cabinet with folders for each client. All the paperwork goes in there. Easy to grab when I need to double-check something.
For invoices and tracking, I use Google Sheets. One tab for each year, columns for:
Client name
Invoice number
Date sent
Amount
Due date
Date paid
I color code rows - green for paid, yellow for sent but not due yet, red for overdue. Helps me see at a glance what needs attention.
For creating invoices, I made a template in Google Docs. Just duplicate it, fill in the details, and send as a PDF. Takes maybe 5 minutes tops.
It’s not fancy, but it keeps everything organized without costing me anything extra. Just gotta be diligent about updating it regularly.
Spreadsheets work, but they’re a pain to update. I use a basic invoicing app on my phone. Costs me about 10 bucks a month, but saves hours of headaches.
Enter client info once, then just plug in hours and rates for each job. Spits out professional invoices I can email right away. Tracks payments too.
For contracts, I keep it old school. File folder for each client, hard copies inside. Quick to grab when I need to check details. Not fancy, but it gets the job done without fuss.
I use a notebook and a calendar. Write down jobs and payments. Mark 'em off when done. Easy to flip through and see what’s what. Don’t need fancy stuff for this kinda work.