AFAS integration

Connect AFAS to your invoicing, automatically updated

slimzaak connects directly to AFAS via OAuth2 and keeps your accounting up to date on its own. Customers, sales invoices, expenses, and receipts flow through automatically to AFAS as sales and purchase entries, so you never have to enter anything twice. Your VAT return data is prepared in AFAS, ready for you or your accountant to file with the tax authorities. slimzaak doesn't replace AFAS — it's where invoices, quotes, expenses, receipts, and marketplace orders come together before flowing automatically and in a structured way into your AFAS records. If you work with multiple webshops or marketplace integrations, everything comes together in slimzaak in one central place, ready to flow through to AFAS.

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01
Connect
Connect AFAS in just a few minutes
You connect your AFAS environment to slimzaak through a secure OAuth2 integration. Once it's active, there's nothing more to do — slimzaak automatically sends your records to AFAS from that point on, without you ever having to re-enter data. Meanwhile, you keep working in slimzaak as usual: creating invoices, sending quotes, photographing receipts. In the background, the integration makes sure AFAS always has the latest picture.
- Secure OAuth2 connection, no manual exports
- Set up once, fully automatic after that
- Works alongside your existing AFAS setup
- Built for SMBs that use AFAS as their accounting software
02
Sync
Customers, invoices, and expenses automatically in AFAS
Once connected, slimzaak syncs continuously with AFAS. Your customers and contacts come across automatically, sales invoices from slimzaak are posted in AFAS as sales entries, and expenses and receipts — already captured automatically by slimzaak's AI scan — land as purchase entries. Got a receipt? Just snap a photo; slimzaak reads the details and prepares the entry. Nothing needs to be entered twice, and your AFAS records stay continuously in sync with what's happening in slimzaak.
- Customers and contacts synced automatically
- Sales invoices posted automatically as sales entries in AFAS
- Expenses and receipts (AI scan) posted automatically as purchase entries
- No double entry between slimzaak and AFAS
03
VAT return
VAT return data prepared in AFAS
slimzaak prepares your VAT return data in AFAS based on your sales and purchase entries. You or your accountant file the return from AFAS with the tax authorities — slimzaak never files anything itself. That keeps filing exactly where it belongs: with you or your accountant, with all the underlying figures already processed correctly and clearly in AFAS, with no manual retyping required.
- VAT return data automatically prepared in AFAS
- Filing with the tax authorities stays with you or your accountant
- slimzaak never files anything with the tax authorities itself

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Frequently asked questions

How do I connect AFAS to slimzaak?

You connect your AFAS environment to slimzaak through a secure OAuth2 integration. It takes just a few minutes to set up. From that point on, slimzaak syncs automatically with AFAS, with no manual exporting or importing required.

What data does slimzaak sync with AFAS?

slimzaak syncs your customers and contacts, sales invoices as sales entries, and expenses and receipts (already captured automatically by slimzaak's AI scan) as purchase entries. Your VAT return data is also prepared in AFAS, so the return is ready to file right away.

Does slimzaak file my VAT return with the tax authorities?

No. slimzaak prepares the VAT return data in AFAS, but you or your accountant handle the actual filing with the tax authorities from AFAS. slimzaak never files anything itself.

Does slimzaak replace my AFAS accounting?

No, slimzaak doesn't replace AFAS. It's the invoicing and admin tool where your invoices, quotes, expenses, receipts, and marketplace orders come together, after which everything flows through to AFAS automatically as entries. You keep using the AFAS environment you're familiar with, just without the manual retyping.