Agency Invoicing, Retainer Billing, and Time Tracking: FreshBooks vs. QuickBooks vs. Harvest
Late payments and unpaid invoices are a silent tax on marketing agencies. The average small agency spends 15-20 hours per year chasing overdue invoices — time that could be spent on client work or sales. The right billing infrastructure eliminates this: automated retainer billing via Stripe, professional invoices through FreshBooks or QuickBooks, and time tracking via Harvest ensures every hour is accounted for and every invoice gets paid on time. This guide compares your options so you can build a billing system that runs on autopilot.
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FreshBooks for Marketing Agencies
FreshBooks ($17-55/month, 30-day free trial) is the most agency-friendly invoicing platform on the market. Its core features for agencies: recurring invoice creation (set up a retainer invoice once, it auto-sends monthly), time tracking built into the platform (log hours against specific clients and projects), automatic late payment reminders (FreshBooks follows up on overdue invoices automatically so you don't have to), expense tracking by client (categorize tool costs and contractor payments by client for accurate profitability reporting), and client portals where clients can view all invoices and pay by credit card or bank transfer. The Lite plan ($17/month) handles up to 5 active clients — perfect for solo founders. The Plus plan ($30/month) adds unlimited clients, proposals, and double-entry accounting. Integration with Stripe for automated credit card billing requires the Plus plan or higher.
QuickBooks Online for Established Agencies
QuickBooks Online ($30-100/month) is better than FreshBooks for agencies that need robust financial reporting, complex expense categorization, payroll integration, and CPA-grade bookkeeping. Its project profitability feature tracks revenue, expenses, and unbilled time per client — invaluable for understanding which clients are actually profitable. QuickBooks integrates with virtually every other business tool and is the default choice for accountants. The learning curve is steeper than FreshBooks, and its invoicing interface is less polished. Recommended for agencies billing over $15,000/month or those with employees and payroll complexity. Pair it with a dedicated bookkeeper (Bench.co starts at $299/month) for monthly reconciliation, tax preparation, and financial reporting.
Harvest for Time Tracking Against Retainers
Harvest ($12/user/month, free for solo with 2 clients) is the most-used time tracking tool in the agency industry for one reason: it tracks time against retainer budgets and sends alerts when a client's budget is nearly consumed. Set up a retainer project in Harvest with a monthly budget of hours. As you and your team log time, Harvest shows the budget burn rate in real time. When a client's allotted hours are 80% consumed, Harvest alerts you — before you go over-budget and into unpaid work. Harvest integrates directly with FreshBooks and QuickBooks (time entries flow into invoices automatically), Asana (start the Harvest timer from within a task), ClickUp, and Basecamp. For any agency with retainer clients, Harvest pays for itself in the first month by preventing budget overruns.
Automating Retainer Billing with Stripe
Stripe's subscription billing feature ($0.25 per invoice + 2.9% + 30 cents per successful card charge) lets you charge clients automatically on the 1st of each month without sending a manual invoice. Setup takes 15 minutes per client: enter the client's credit card, set the recurring amount and billing date, and Stripe handles everything else. For ACH bank transfer (cheaper at 0.8%, capped at $5), Stripe's ACH feature requires client bank account verification but is worth it for large retainers ($5,000+/month). FreshBooks and QuickBooks both integrate with Stripe for automatic payment collection directly from invoices. Many agency owners use both: FreshBooks for invoice creation and reporting, Stripe for automatic payment collection. Stripe's dashboard also shows your MRR, failed payments, and churn — useful metrics for any subscription-based business.
Handling Failed Payments and Overdue Invoices
Failed payments happen — expired cards, insufficient funds, bank issues. Build a policy: Stripe automatically retries failed payments 3 times over 7 days. If payment fails, send a personalized (not automated) email within 24 hours: 'Hi [name], your payment for [month] didn't go through — could be an expired card. Can you update your payment method here [Stripe customer portal link]?' Most clients fix payment issues within 48 hours when approached professionally. For invoices that remain unpaid past net 30 days, apply the late fee specified in your contract (1.5%/month is standard). After 60 days, pause service with written notice. After 90 days, engage a collections agency or small claims court depending on the amount.
RECOMMENDED TOOLS
FreshBooks
Agency invoicing, recurring retainer billing, time tracking, and expense management in one platform
Harvest
Time tracking against retainer budgets with budget alerts and automatic invoice integration
Stripe
Automated monthly retainer billing — charge clients on autopilot with subscription payments
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FREQUENTLY ASKED QUESTIONS
Should I require clients to pay by credit card or bank transfer?
Offer both. Credit cards are faster to collect but carry a 2.9% fee — for a $5,000/month retainer, that's $145/month in processing fees. Bank transfer (ACH) is cheaper (0.8%, max $5) but takes 3-5 business days. Many agencies absorb credit card fees for retainers under $3,000/month for the convenience, and negotiate ACH for larger retainers.
How do I track contractor costs against client retainers?
Create expense categories in FreshBooks or QuickBooks for each client. When you pay a contractor for work on Client A, categorize that expense under Client A. This gives you per-client gross margin at a glance. Harvest also lets contractors log time directly against client projects, giving you a time-based view of delivery costs.
What's the best invoice payment term for agencies?
Net 15 is the agency standard for retainers. Net 30 is acceptable for larger clients with formal AP processes. Avoid net 60 — it means you're financing your client's business. For project work, never allow payment terms longer than the project duration.
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