n8n Workflow: Automatic Invoicing with sevDesk – Simple & Efficient

The most unexpected benefit wasn\'t the time savings—it was the mental liberation. Every completed task used to carry an invisible weight: "I'll need to remember this for invoicing." That cognitive burden has vanished entirely. When my son wants to look at books together, I'm fully present for what matters most—not mentally calculating whether I've invoiced Client X yet.

The Friday Evening Invoice Routine

It's Friday evening, 5:30 PM. My family is winding down for the weekend, but I'm hunched over my laptop at the kitchen table, surrounded by browser tabs and a growing sense of dread. It's again that time of collecting maintenance tickets from the past month, and I'm staring at a scattered trail of completed tasks across my project management system.
Each line item requires manual assembly: "Updated contact form validation - 0.5 hours." "Fixed mobile menu display issue - 1.2 hours." "Optimized image loading on product pages - 2.3 hours." Copy task title, check time tracking, paste into sevDesk, repeat. For six tasks, this "simple" monthly invoice is consuming 25 minutes of my Friday evening—time that should belong to my family.
This monthly ritual was draining more energy than it should. What started as a straightforward administrative task had become a recurring source of frustration that ate into my personal time. I knew I needed to find a way to optimize this process—not just to save time, but to reclaim my Friday evenings for what actually matters.

From Email Chaos to Automated Invoicing

The Client Communication Reality

My workflow had evolved into a scattered three-step dance: clients would email maintenance requests, I'd create tickets in my project management system (ClickUp), and then manually piece everything together for invoicing at month's end.
A typical month looked like this: "Hi, the contact form isn't working on mobile" arrives via email Tuesday morning. I create a ClickUp task, fix the issue, log my time, and mark it as complete. But completion wasn't really completion—it was just the beginning of the invoicing countdown. That task would sit there, waiting to be manually transferred into sevDesk weeks later.
With six active maintenance clients, this meant juggling 15-30 completed tasks monthly, each requiring the same manual data transfer: copy task title, check time logged, find the client's hourly rate, paste into invoice line item, repeat.

The 40€ Minimum Threshold Trap

To avoid sending tiny invoices for single 30-minute tasks, I'd implemented a 40€ minimum threshold rule. Tasks would accumulate with a "READY FOR PAYMENT" status until they crossed this threshold, then I'd batch them into a single invoice.
This seemed logical at first—who wants to create and process a 5€ invoice for fifteen minutes of work? It's not just about my time creating the invoice; it's also about the administrative burden on the client's side. Each invoice requires their attention for processing, approval, and payment. A 5€ invoice creates disproportionate overhead for everyone involved.
But the batching created its own problem: Administrative explosion. Instead of processing 5-6 line items monthly, I'd face 15-20 items spanning multiple months during quarterly invoice sessions. What was supposed to be a quick monthly task became a complex quarterly project requiring much more time and mental energy.
The 40€ rule that was supposed to streamline my invoicing had actually created more work.

Status-Driven Logic: The Automation Breakthrough

The solution became clear when I realized I could automate the quarterly batching process entirely. Instead of manually gathering and processing invoices every few months, what if the system could run automatically every three months and handle everything?
The automation could:

• Run automatically every three months
• Check all clients for tasks with "READY FOR PAYMENT" status
• Calculate total value per client
• For clients exceeding the 40€ threshold, automatically create sevDesk invoices
• Send invoices directly to clients via email or e-invoicing (now mandatory in many regions)
• Update task statuses to "INVOICED"

This approach meant I could keep my existing workflow—marking tasks as "READY FOR PAYMENT" when complete—while eliminating the quarterly manual invoice sessions entirely. The automation would handle the batching logic I'd been doing manually.

Building the n8n + sevDesk Connection

The Technical Foundation

The automation needed to connect two key systems: Airtable (client data and support tickets) and sevDesk (invoicing). The workflow runs automatically every three months, checking each client for completed tasks that are ready for invoicing.
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R{{ $now.format('yyyy') }}-00{{ $('sevDesk -> Get next Invoice N°').item.json.objects.nextSequence }}\",\n      \"mapAll\": true,\n      \"origin\": null,\n      \"status\": 100,\n      \"taxSet\": null,\n      \"address\": \"{{ $('Variables -> Invoice Setup & Check').item.json.currentClient }}\\n{{ $('sevDesk -> Get Client Address').item.json.objects[0].addresses[0].street }}\\n{{ $('sevDesk -> Get Client Address').item.json.objects[0].addresses[0].zip }}\\n{{ $('sevDesk -> Get Client Address').item.json.objects[0].addresses[0].city }}\",\n      \"addressName\": \"{{ $('sevDesk -> Get Client Address').item.json.objects[0].name }}\",\n      \"addressStreet\": \"{{ $('sevDesk -> Get Client Address').item.json.objects[0].addresses[0].street }}\",\n      \"addressZip\": \"{{ $('sevDesk -> Get Client Address').item.json.objects[0].addresses[0].zip }}\",\n      \"addressCity\": \"{{ $('sevDesk -> Get Client Address').item.json.objects[0].addresses[0].city }}\",\n      \"addressCountry\": {\n        \"id\": \"1\",\n        \"objectName\": \"StaticCountry\"\n      },\n      \"contact\": {\n        \"id\": \"{{ $('sevDesk -> Check Contact ID').item.json.objects[0].id }}\",\n        \"objectName\": \"Contact\"\n      },\n      \"payDate\": \"{{ $now.plus(7, 'days') }}\",\n      \"taxRate\": {{ $('Variables -> Invoice Setup & Check').item.json.taxValue }},\n      \"taxText\": \"Umsatzsteuer 19%\",\n      \"taxType\": \"default\",\n      \"currency\": \"{{ $('Variables -> Invoice Setup & Check').item.json.clientCurrency }}\",\n      \"discount\": 0,\n      \"footText\": \"Bitte überweisen Sie den Rechnungsbetrag unter Angabe der Rechnungsnummer auf das unten angegebene Konto.<br>Der Rechnungsbetrag ist sofort fällig.<br><br>Zahlungsbedingungen:<br>Zahlung innerhalb von 14 Tagen ab Rechnungseingang ohne Abzüge.<br><br>Bank: N26 Bank Berlin<br>IBAN: DE43100110012134340674<br>BIC: NTSBDEB1XXX<br><br>Mit Besten Grüße,<br>Philipp Haunstetter<br>\",\n      \"headText\": \"Sehr geehrte Damen und Herren,<br><br>anbei erhalten Sie die Rechnung über abgeschlossene Tasks die Ihre Webseite betreffen.\",\n      \"timeToPay\": 14,\n      \"objectName\": \"Invoice\",\n      \"invoiceDate\": \"{{ $now }}\",\n      \"invoiceType\": \"RE\",\n      \"deliveryDate\": \"{{ $now.minus(3, 'months') }}\",\n      \"contactPerson\": {\n        \"id\": \"1300882\",\n        \"objectName\": \"SevUser\"\n      },\n      \"propertyIsEInvoice\": true,\n      \"invoiceNumber\": \"R{{ $now.format('yyyy') }}-00{{ $('sevDesk -> Get next Invoice N°').item.json.objects.nextSequence }}\",\n      \"paymentMethod\": {\n        \"id\": \"21919\",\n        \"objectName\": \"PaymentMethod\"\n      },\n      \"addressCountry\": {\n        \"id\": \"1\",\n        \"objectName\": \"StaticCountry\"\n      },\n      \"deliveryDateUntil\": \"{{ $now }}\"\n    },\n    \"invoicePosSave\": {{ JSON.stringify($('Aggregate -> All Tickets').item.json.data.map(item => ({\n    \"id\": null,\n    \"name\": item.Task,\n    \"part\": null,\n    \"text\": null,\n    \"price\": Number(item[\"clientHourlyRate (from Data: sevDesk Contacts)\"][0]),\n    \"unity\": {\n      \"id\": \"9\",\n      \"objectName\": \"Unity\"\n    },\n    \"mapAll\": true,\n    \"taxRate\": 19,\n    \"discount\": null,\n    \"priceTax\": null,\n    \"quantity\": Number(item[\"Time Tracked\"]) / 3600,\n    \"objectName\": \"InvoicePos\",\n    \"priceGross\": null,\n    \"positionNumber\": null\n  }))) }}\n}","options":{}},"type":"n8n-nodes-base.httpRequest","typeVersion":4.2,"position":[820,1220],"id":"967e974a-a33c-4846-b882-e88a0a830015","name":"sevDesk -> Create Invoice","credentials":{"sevDeskApi":{"id":"gIjM3b8OewHneAPQ","name":"sevDesk account"}}},{"parameters":{"resource":"invoice","operation":"sendViaEMail","invoiceId":"={{ $json.objects.invoice.id }}","toEmail":"={{ $('Variables -> Invoice Setup & Check').item.json.invoiceAdresses }}","subject":"={{ $json.objects.invoice.invoiceNumber }}","text":"=Hallo zusammen,\n\nanbei die Rechnung {{ $json.objects.invoice.invoiceNumber }}.\n\nVerrechnet wurden die folgenden Tickets:\n{{ $('Aggregate -> All Tickets').item.json.data.map(item => `• ${item.Task}`).join('\\n') }}","additionalFields":{},"requestOptions":{}},"type":"n8n-nodes-sevdesk.sevDesk","typeVersion":1,"position":[1120,1220],"id":"3483dd4f-c5af-4222-9140-f7ece5e1c0ac","name":"sevDesk -> Send Invoice via Mail","credentials":{"sevDeskApi":{"id":"gIjM3b8OewHneAPQ","name":"sevDesk account"}}},{"parameters":{"content":"## Create & Send Invoice based on Invoice Items","height":340,"width":660,"color":7},"type":"n8n-nodes-base.stickyNote","typeVersion":1,"position":[720,1100],"id":"c4338c9c-e738-4c26-a9ab-5fc00cc73f4b","name":"Sticky Note4"}],"connections":{"Every 3 Months @ Midnight1":{"main":[[{"node":"Clients -> Get Data","type":"main","index":0}]]},"Clients -> Get Data":{"main":[[{"node":"hasTickets ? 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Data Sources:

• Airtable Clients Table: Client hourly rates, sevDesk contact IDs, invoice email addresses
• Airtable Support Tickets Table: Task titles, time tracked, "Ready for Payment" status
• sevDesk: Invoice creation, client address data, automatic email sending

The 40€ Threshold Logic: For each client, the workflow calculates the total value of all "Ready for Payment" tasks. If the total exceeds 40€, it creates an invoice with all pending tasks. If not, the tasks remain ready for the next quarterly run.

Working with the sevDesk API

The sevDesk API required precise data formatting, but once configured properly, it handles the complete invoicing process automatically. The workflow gathers tasks, calculates totals, creates invoices, and sends them via email or e-invoicing—all while I'm away from the computer.

The Results: Friday Evenings Reclaimed

Time Impact

The numbers tell a clear story. What used to consume 25 minutes per client, multiple times monthly, now happens automatically every three months. That's roughly 2+ hours monthly returned to my personal time—time that was consistently stolen from Friday evenings and weekends.
But the real transformation wasn't just the time saved. It was the timing shift. Instead of manual invoice sessions scattered throughout the month, interrupting family dinners and weekend plans, everything now processes automatically on the 1st of each quarter at midnight. I wake up to completed invoices and updated task statuses, with zero manual intervention required.

The automation doesn't need me to be available, awake, or even thinking about invoicing. It runs while I'm sleeping, traveling, or focused on client work. This reliability has eliminated the anxiety of "falling behind" on administrative tasks.

Mental Bandwidth Recovery

The most unexpected benefit wasn't the time savings—it was the mental liberation. Before automation, every completed task carried an invisible weight: "I'll need to remember this for invoicing." Every client conversation included the underlying anxiety of "Have I tracked everything correctly?"
That cognitive burden has vanished entirely. Completing a task is now truly completion. Changing the status to "Ready for Payment" used to be the beginning of my manual invoicing countdown; now it's the end of my involvement in the billing process.

The Liberating Feeling: There's something profoundly satisfying about knowing that billing happens automatically. I often joke that "invoicing is a thing that just moves on now and I don't need to take care of it." But it's not really a joke—it represents a fundamental shift from reactive administration to proactive systems.

Focus Shift

With the mental bandwidth previously consumed by invoicing logistics now available, I've redirected that cognitive energy toward activities that actually matter:

Client Value Creation: Instead of spending Friday evenings copying task titles into sevDesk, I can focus on solving client problems and improving service quality.
Family Presence: When my son wants to look at books together or play silly games, I'm not mentally calculating whether I've invoiced Client X yet. I'm fully present for what matters most.
Strategic Thinking: The mental space freed up from routine administration has allowed me to think more strategically about business development and process improvements.

This isn't just about productivity—it's about designing work that supports the life I actually want to live.

Next Steps: From Inspiration to Implementation

Ready to Reclaim Your Friday Evenings?

If this automation journey resonates with you, the actual n8n workflow is available for download and adaptation to your specific setup. The workflow includes all the logic for client data lookup, threshold calculations, invoice creation, and email sending.

What You'll Need:

• n8n instance (cloud or self-hosted)
• sevDesk account with API access
• Airtable setup for client and ticket management

The Workflow Includes:

• Complete node configuration for all data connections
• Threshold logic for batching invoices
• sevDesk API integration for invoice creation
• Automated email sending with custom templates

Beyond This Single Automation

The real value isn't just in automating invoicing—it's in recognizing that any recurring manual task stealing your personal time is a candidate for automation. This workflow demonstrates the principles that can be applied to client onboarding, project status updates, report generation, or any other administrative routine.
The question isn't whether automation is worth the initial investment. The question is: What recurring task is currently stealing time from what matters most to you?
Start there, and design your way to the life you actually want to live.

From Friday Evening Frustration to Family Time Freedom

It's Friday evening, 5:30 PM. My family is winding down for the weekend, and I'm sitting at the kitchen table—not hunched over my laptop with a growing sense of dread, but present and available for whatever silly games or book reading my son has in mind.
The scattered trail of completed tasks still exists in Airtable, but they no longer create an invisible countdown in my mind. The 40€ threshold calculations, the sevDesk formatting, the client email sending—all of it happens automatically while I'm focused on what actually matters.
This transformation from manual invoicing sessions to automated quarterly processing represents more than just efficiency gains. It's a fundamental shift from letting administrative tasks dictate when I'm available for my family to designing systems that protect the time and mental space for what truly drives both business success and personal fulfillment.
The Friday evening invoice routine is gone. In its place: presence, focus, and the quiet satisfaction of knowing that technology is serving my life priorities rather than enslaving my evenings to administrative busy work.

Your Friday evenings are waiting to be reclaimed too.