Last checked September 4, 2026 · Official sources
InvoiceAgent vs BigTime
BigTime connects time, expenses, project delivery, approvals, invoicing, payments, accounting integrations, and professional-services reporting. InvoiceAgent is the lighter choice when the firm does not need a PSA rollout and wants invoice preparation, delivery, and follow-up to stay simple.
Choose BigTime
Choose BigTime when billing must inherit approved time, expenses, rates, budgets, project controls, payment collection, and general-ledger connections.
Choose InvoiceAgent
Small service teams that keep projects and accounting elsewhere and want WakaTime or Toggl imports, test sends, recurring delivery, reminders, and send-time FX without a PSA implementation.
Timing-first invoicing
Schedule the invoice once. Weekend rules, reminders, recurring sends, manual-send overrides, and PDF delivery stay coordinated from one queue.
Live FX at dispatch
Draft early in the source currency. Let the final conversion happen when the invoice actually goes out.
Branding and time-tracking built in
Choose invoice templates, colors, fonts, logo treatment, and import billable hours from WakaTime or Toggl without adding another tool.
What this comparison is for
Consultancies, engineering firms, agencies, IT services teams, and other professional-services firms comparing a PSA platform with a focused invoice workflow.
Here is the real tradeoff.
Choose BigTime when the invoice must be the financial result of approved time, expenses, rates, budgets, WIP, payments, and project controls. Choose InvoiceAgent when those layers would be unnecessary and the real problem is reliable, reviewable invoice delivery.
Why teams switch
Your team is too small to benefit from project portfolios, utilization, WIP, resource planning, multi-level approvals, and a broader PSA implementation.
Why teams switch
Approved hours already live in WakaTime or Toggl and need a direct path into a client-ready invoice rather than a new time-entry system.
Why teams switch
You need an email and PDF preview before delivery, with the latest available exchange rate applied when the invoice is sent.
Why teams switch
Your accounting and payment systems already work, so the buying job is a clearer invoice queue rather than finance-platform consolidation.
Side-by-side without the marketing fog.
Core audience
Small service businesses that want invoice preparation, delivery, and follow-up without a PSA rollout.
Professional-services firms that need financial and delivery operations connected across projects and teams.
Invoice creation
Import tracked work, build a service invoice, preview the PDF and email, and choose manual or scheduled delivery.
Generate invoices from time, expenses, rates, WIP, projects, budgets, and multiple billing models with configurable approvals.
Recurring schedules
Keep recurring sends visible in one queue with weekend-aware timing and a manual-send override.
Scheduled invoicing can automatically generate drafts monthly or quarterly from configured project budgets and templates.
Reminder controls
Attach due-date and overdue follow-up to the invoice workflow, then adjust it when a client replies.
Configure up to three messages before and three after the due date, with client-level controls and balance conditions.
PDF and email delivery
Preview and test-send the branded email with its client-ready PDF attachment before the real delivery.
Email a draft, send a preview copy, add attachments and contacts, use templates, send in bulk, and track sends and views.
Payment collection
Add bank instructions or a hosted payment link from your chosen provider; InvoiceAgent does not process payments.
BigTime Payments adds credit card, ACH, scheduled payment, AutoPay, reconciliation, and payment reporting workflows.
Time tracking
Import approved WakaTime or Toggl entries and group them into client-readable invoice lines.
Native time and expense capture, approvals, rate cards, project controls, and billing are part of the PSA data model.
Multi-currency behavior
Draft in a source currency, apply the latest available FX rate at send time, and lock it into the PDF.
Advanced adds multi-currency expenses; Premier adds multi-currency invoicing with currency lists, dated rates, client currencies, and rate cards.
Accounting scope
Does not replace project accounting, WIP, revenue recognition, bank reconciliation, tax, payroll, or financial reporting.
Connects delivery and billing data to QuickBooks, Sage Intacct, and wider finance workflows, depending on plan and modules.
Setup effort
A focused seven-day trial centered on invoice rules, delivery, reminders, and one operational queue.
A sales-assisted PSA evaluation and wider configuration across projects, staff, rates, budgets, approvals, accounting, and payments.
Support and ecosystem
A focused product and help path; validate the complete invoice workflow during the trial.
A mature help center, accounting and CRM integrations, professional services, plan-dependent phone support, and enterprise modules.
Checked against current official sources.
This is a desk-researched comparison, not a claim that we tested every account, region, or edge case.
Evaluation method
We compared the current public products across core audience, invoice creation, recurring schedules, reminder controls, PDF and email delivery, payment collection, time tracking, multi-currency behavior, accounting scope, setup effort, pricing, and support. We reviewed BigTime's official pricing, billing, scheduled-invoicing, reminder, delivery, and multi-currency documentation; we did not run a hands-on BigTime environment or implementation for this update.
Pricing snapshot
BigTime states that Essentials starts at $20 per user/month and includes time tracking, invoicing, expense management, payments with BigTime Delivery, automatic reconciliation, and QuickBooks integration. Advanced, Premier, Enterprise, and added modules require a tailored evaluation; the public page does not list a complete checkout price for those configurations. InvoiceAgent lists $24 monthly, $240 annually, or $12 once for one non-recurring invoice; it does not process client payments.
Check before buying: BigTime is sold as a modular, sales-assisted professional-services platform. Final price, included modules, implementation effort, integrations, support, payment fees, and multi-currency access depend on the package and contract. Confirm a written scope and total cost with BigTime before buying.
Primary sources
Last checked September 4, 2026
Best for BigTime
When the bigger suite is the right call
Growing professional-services firms that need project accounting, time and expense approvals, WIP visibility, diverse billing models, payment collection, and finance-system integration.
Best for InvoiceAgent
When a specialist wins
Small service teams that keep projects and accounting elsewhere and want WakaTime or Toggl imports, test sends, recurring delivery, reminders, and send-time FX without a PSA implementation.
Questions to settle before you switch.
Is InvoiceAgent a replacement for BigTime PSA?+
No. InvoiceAgent does not provide project portfolios, resource planning, WIP, time and expense approvals, revenue recognition, multi-level billing approvals, or general-ledger integration. BigTime is the stronger fit when those controls are the buying job.
Can BigTime generate scheduled invoices and reminders?+
Yes. BigTime documents monthly or quarterly scheduled invoice generation from project budgets. It also supports up to three reminder messages before and three after the due date, subject to invoice, balance, contact, and setup conditions.
Which product is better for multi-currency professional services?+
BigTime Premier is stronger when client currencies, dated rates, rate cards, project economics, and accounting links must stay inside one PSA. InvoiceAgent is simpler when the need is to apply the latest available FX rate at send time and lock it into the client PDF.
Map a lighter consulting workflow
Review tracked time, retainers, invoice delivery, and follow-up without a PSA rollout.
Open guideImport approved external time
See how WakaTime or Toggl entries become reviewable invoice lines.
Open guideCompare send-time currency handling
Plan currency, conversion timing, payment instructions, delivery, and follow-up.
Open guideCheck InvoiceAgent pricing
Compare monthly, annual, and single-invoice options.
Open guideSee the send queue, preview the PDF, and test the FX flow yourself.
The fastest way to compare products is to run your own billing workflow through one. Start with a single invoice, import the work, preview the branded PDF, and feel the difference.