Customers and contacts
A contact stores a customer's details once so you can reuse them on every invoice: you don't retype the name or the tax ID each time you bill them. On top of that, the contact's details determine the tax regime Aikount applies to the sale.
What a contact stores
- Name or legal name of the customer.
- Tax ID / VAT number: the fiscal identification number. For EU customers, the intra-EU VAT number.
- Country: determines whether the sale is domestic, intra-EU or an export.
- Address and contact details that flow onto the invoice.
Why country and VAT matter
The customer's country and VAT number are what decide which VAT the invoice carries and which AEAT models it appears in:
- Spanish customer → domestic VAT (for example,
21%). - Business in another EU country with a valid VAT number → exempt intra-EU operation (
IVAINTRA), reported on Modelo 349. - EU consumer → Spanish VAT, or the customer's country VAT via OSS if you cross the threshold and are registered.
- Customer outside the EU → export, out of scope for VAT.
A wrong country or VAT number makes the invoice apply the wrong regime and mis-reconcile in the
303or349. Check these two fields before you bill a new customer.
Each case is detailed in Customer regime (EU, OSS, export).
Reuse on invoices
When you create an invoice you pick the contact and Aikount fills in its tax details automatically. If you update a contact's VAT number or country, future invoices use the new details; invoices already issued keep what they had at the moment they were issued.
Contacts and accounting
Every customer is reflected in the books through its debtor account (430 customers). Outstanding balances per customer and bank reconciliation rely on that identity, so keeping a single contact per real customer avoids duplicates and mismatches.
Next step
With the customer created, you can Create an invoice. For the tax detail, see VAT and IRPF.