Automating your accounting costs less than one hour of your accountant's time per month — if you do it right. That sounds like a bold claim, but the numbers back us up. An average accountant charges 150 to 200 euros per hour. The tools we present in this article cost between 6.90 and 34.90 euros per month. Even with automation setup costs, you stay under the price of a single consulting hour — every month.
In this article, we do the math: What does accounting automation really cost? Which tool fits which company size? And where's the tipping point where the switch stops just making sense and starts paying off?
Automating accounting doesn't mean software does everything on its own. It means repetitive steps are eliminated: typing in receipts, matching bank statements, monitoring payment deadlines, preparing VAT returns. These are tasks that consume 10 to 15 hours per month in a typical SME.
Automation handles most of that. At its core, there are three levels:
At Exasync, we operate internally at Level 3: our AI agent Plutus — the CFO of our 50-strong agent team — handles invoice creation automatically. The Finance Lead Chrysos manages cash flow monitoring. Document processing runs through n8n workflows connected to our Supabase database.
Before we talk tools, it's worth looking at the actual time drains. Everyone knows the obvious ones: typing in receipts, bank reconciliation, VAT returns. But there are three hidden cost drivers that never show up in any time tracking:
Document search. A BITKOM study shows that office workers spend an average of 30 percent of their work time searching. In accounting, this is especially pronounced: Where's the invoice from supplier X? Was it already paid? Which account was used? Each search takes 2-5 minutes. At 20 searches per week, that's 40-100 minutes that never appear in any time log.
Follow-up questions. Incomplete documents, missing approvals, unclear assignments. Each follow-up takes 1-3 days on average because emails sit unread. During that time, the document stays open. This delays the monthly close and increases stress at quarter-end.
Context switching. Jumping between email inbox, accounting tool, banking portal, and file system costs cognitive energy. Studies from the American Psychological Association show: each context switch costs 15-25 minutes of productivity. Anyone switching between tools 10 times a day loses 2-4 hours of effective work time.
Automation solves all three problems: documents are centrally stored and searchable. Approval workflows enforce complete information. And integrating different systems eliminates manual context switching.
The three relevant providers in the German-speaking market are Lexware Office, sevDesk, and DATEV Unternehmen online. Here's the honest breakdown:
| Provider | Entry | Full Accounting | Premium | DATEV Export | API |
|---|---|---|---|---|---|
| Lexware Office | 6.90 EUR/mo (S) | 19.90 EUR/mo (L) | 32.90 EUR/mo (XL) | All plans | Limited |
| sevDesk | 8.90 EUR/mo | 19.90 EUR/mo (2yr) | 27.90 EUR/mo (Pro) | From Accounting tier | Yes (REST) |
| DATEV UO | 10.50 EUR/mo | ~14 EUR/mo | ~20 EUR/mo (Extended) | Native | Limited |
Honest assessment: Lexware Office and sevDesk cover 90% of SME requirements. DATEV is mandatory if your tax advisor demands it. sevDesk has the better API for automation, Lexware Office has the more intuitive interface. Both offer free trial periods.
What's missing from the price lists: training time. An employee needs an average of 5-10 hours before they can confidently use a new accounting tool. When switching from DATEV to sevDesk, expect 2-3 weeks of onboarding time during which productivity drops.
Example: Trading company with 50 incoming and 80 outgoing invoices per month. Current state: 12 hours/month accounting effort.
Before (manual process):
After (automated):
Savings: 10.5 hours/month. At 22 EUR hourly wage = 231 EUR personnel costs saved. Minus software (20 EUR) and automation (0-20 EUR): Net approx. 190-210 EUR/month. Setup pays for itself in 3-8 months.
The calculation gets even better when you factor in opportunity costs: 10.5 hours that an employee can spend on value-creating work instead of typing. Client consulting, sales, process improvement. That's harder to quantify but often the bigger lever.
Freelancer (0-5 invoices/month): Lexware Office S or sevDesk Invoicing. Under 10 EUR. Automation barely pays off. Photographing and uploading receipts is enough.
Small business (10-50 invoices): Lexware Office L or sevDesk Accounting. Under 25 EUR. Use automatic document assignment. Set up bank connection. That alone saves 3-5 hours per month.
Mid-market (50+ invoices): sevDesk Pro or Lexware XL + n8n. Auto-import incoming invoices from email, approval via Slack/Teams, automatic payment reminders. Here it's worth setting up a dedicated email address (invoices@company.com) that collects all invoices centrally.
GmbH/AG with tax advisor: DATEV Unternehmen online. Approx. 14 EUR. Direct tax advisor access, but additional middleware needed for automation. Important: clarify upfront with your tax advisor whether DATEV export from third-party tools is accepted.
Here's the workflow we set up at Exasync for clients:
This workflow processes an invoice in under 30 seconds. Manual effort: zero, unless the approval threshold is exceeded or the parser can't recognize the document.
Chaotic documents: If your invoices live in three email inboxes and a shoebox, even the best tool will fail. Garbage in, garbage out. Before you automate, you need to create order. A single intake channel is mandatory.
Complex corporate structures: Intercompany transactions, foreign currencies, and group-wide consolidation need ERP systems like SAP Business One or Microsoft Dynamics, not Lexware. The tools presented here are optimized for sole proprietorships and SMEs with one or two entities.
Tax advisors who won't cooperate: If your tax advisor doesn't accept DATEV exports and insists on hand-sorted binders, the best workflow is useless. Clarify the collaboration upfront. If necessary: switch tax advisors. There are plenty of digitally savvy firms.
Unrealistic AI expectations: Document recognition for new suppliers runs at 60-80%. The system only improves after corrections. Ramp-up period: 2-3 months. Anyone who expects perfection on day one will be disappointed. Anyone who accepts that the first few weeks require manual review will be rewarded long-term.
Anyone processing documents digitally must comply with the GoBD (German principles for proper bookkeeping and data storage). Specifically:
Our tip: have a one-time conversation with your tax advisor about the GoBD compliance of your planned setup. It costs half an hour and prevents nasty surprises during a tax audit.
We're an AI company with one founder and 50 digital employees. Our CFO agent Plutus generates invoices automatically. The Finance Lead Chrysos monitors cash flow and reports deviations. Incoming documents flow through n8n workflows directly into our Supabase database. Total cost for our complete accounting automation: under 25 EUR per month.
Through our industry solutions, we also build these workflows for clients. The principle stays the same: automation should never cost more than 25 percent of an employee's salary. If the software is more expensive than the saved work time, something's wrong with the architecture.
In the first three months after founding, Exasync generated 10,000 EUR in revenue — bootstrapped, no investors, with one founder and 50 AI agents. A key factor: minimal operational costs through consistent automation of all back-office processes.
Yes — for most companies with 10+ incoming invoices, automation pays off.
The first step costs nothing: try Lexware Office for 30 days, track your own time investment for a week. If you want a fully configured workflow with n8n and Supabase: talk to us — free initial consultation, honest assessment.
Further reading: Automate Business Processes in 10 Steps | AI in the Workplace: 10 Ways to Save Time Immediately | 5 Processes Every SME Can Automate Immediately
