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Tax exemption reason code per the Spanish VAT Law (Ley 37/1992, LIVA), with the VeriFactu code each one is reported as.

• EXENTA_ART_20: exempt, art. 20 (domestic operations such as medical, educational, cultural and financial services, or housing rentals). E1.
• EXENTA_ART_21: exempt, art. 21 (exports of goods). E2.
• EXENTA_ART_22: exempt, art. 22 (operations treated as exports). E3.
• EXENTA_ART_24: exempt, art. 24 (free zones, warehouses and customs regimes). E4.
• EXENTA_ART_25: exempt, art. 25 (intra-community supplies of goods). E5.
• EXENTA_ART_26: exempt, art. 26 (intra-community acquisitions of goods). It exempts the buyer's acquisition, not a supply the seller invoices, so an invoice line that carries it is rejected with EXEMPTION_NOT_FOR_ISSUED_INVOICE; a supply to another Member State is EXENTA_ART_25.
• NO_SUJETA_ART_7_9: not subject under art. 7 (such as the transfer of a business as a going concern, art. 7.1º). N1.
• NO_SUJETA_LOCALIZACION: not subject by the place-of-supply rules (intra-community or non-EU services, arts. 69 and 70). N2.
• ISP_ART_84_2_A … ISP_ART_84_2_F: reverse charge (the invoice states «inversión del sujeto pasivo»), art. 84.Uno.2.º letters a) (supplier not established in Spain), b) (unwrought or semi-finished gold), c) (scrap, waste and recovery materials, plastic, paper, cardboard, glass and textile waste, and semi-finished non-ferrous metal products), d) (greenhouse gas emission allowances), e) (certain real estate supplies: in insolvency proceedings, with the exemption waived, or enforcing a security) and f) (construction or renovation works). S2.
• ISP_ART_84_2_G: reverse charge of letter g) (silver, platinum, palladium, mobile phones, consoles, laptops and tablets). The law requires these supplies to be invoiced in a special series, so an invoice line that carries it is rejected with REVERSE_CHARGE_CASE_NOT_SUPPORTED.
• EXENTA_ART_140: investment gold exemption, art. 140 bis (usually with regime_key 04). E6.
• REGIMEN_ART_129 (agriculture, livestock and fishing, arts. 124 to 134 bis), REGIMEN_ART_135 (second-hand goods, art and antiques), REGIMEN_ART_141 (travel agencies), REGIMEN_ART_154 (equivalence surcharge) and REGIMEN_ART_163_DECIES (cash basis, arts. 163 decies to 163 sexiesdecies): operations of special regimes, which VeriFactu identifies by the regime key rather than by an exemption code. An invoice line that carries one is rejected with EXEMPTION_REGIME_NOT_SUPPORTED_IN_VERIFACTU; declare the regime with regime_key instead.
• OTRO: any other provision. Requires the text in exemption_reason_text. E6.

Custom exemption text, mandatory when default_exemption_reason is OTRO.

Only EXENTA_ART_20 and OTRO can be declared as a default — the reasons a NIF can verify on its own. The rest depend on the recipient, the operation or the regime, so they are declared per invoice line; sending one returns 422. A 0% VAT/IPSI without a reason is also rejected with 422: in those taxes 0% is not a rate, it is the sentinel of an operation carrying no tax.

Whether the freelancer is under the equivalence surcharge regime.

Omit it to leave the current value untouched. On creation, omitting it means false.

Equivalence surcharge percentage in decimal format, one of the values AEAT accepts. Pairs allowed (VAT rate ↔ surcharge): 21↔5.2, 21↔1.75 (tobacco products), 10↔1.4, 4↔0.5, and the temporary ones, only on operations of their period: 5↔0.5 up to 2022-12-31, 5↔0.62 from 2023-01-01 to 2024-09-30, and 7.5↔1 and 2↔0.26 from 2024-10-01 to 2024-12-31. A pair outside its period is rejected with 422 SURCHARGE_RATE_NOT_ACCEPTED_ON_DATE. GET /v1/tax-types publishes every pair with its valid_from / valid_until. The backend automatically normalizes equivalent formats (5.20 → 5.2).

Whether IRPF withholding should be applied.

Omit it to leave the current value untouched. On creation, omitting it means false: a withholding nobody declared is not applied.

Withholding (IRPF) percentage, as the IRPF regulation (Royal Decree 439/2007) sets it: 0 (no withholding), 1 (pig fattening and poultry, and some activities under objective estimation), 2 (other agricultural, livestock and forestry activities), 7 (professional activity in its first three years, and the other 7 % cases), 15 (professional activities, and intellectual property income), 19 (rent of urban property and other income of art. 75.2.b; also the general rate of the Corporate Income Tax withholding) and 24 (image rights). A company that pays Corporate Income Tax can only use 0, 19, 24 and 9.5: see WithholdingOptions.

Ceuta and Melilla: income with the Ceuta and Melilla deduction bears the base rate reduced as the law sets it. Under IRPF, 15 % and 7 % (professional activities) and 19 % (rent of urban property located there) are reduced by 60 %: 6, 2.8 and 7.6. Under Corporate Income Tax, 19 % on those rents is halved: 9.5, which only a company can use (IRPF_RATE_ONLY_FOR_CORPORATE_ISSUER otherwise). Whether the reduction applies is the issuer's choice: the NIF does not show it.

The value counts, not how it is written: 15.0 is 15 and 2.80 is 2.8.

Whether the freelancer is exempt from IRPF withholding.

Omit it to leave the current value untouched. On creation, omitting it means false.

Payment method shown on invoices and recurring invoices.

• NONE: no payment information is shown.
• BANK_TRANSFER: bank transfer to the IBAN of the payment details; the only method that requires an IBAN.
• CARD: card payment.
• CASH: cash payment.
• CHECK: payment by cheque.
• DIRECT_DEBIT: direct debit from the customer's bank account.
• BIZUM: payment through Bizum.
• OTHER: any other method.

Default payment term in days (0-365). Omit it to leave the current value untouched; send null to clear it.

Default validity term in days for new proformas (0-365). Omit it to leave the current value untouched; send null to clear it (proformas stop getting a prefilled expiry date).