| Samoa |
No mandate |
No mandate |
Samoa has no e-invoicing or transaction-level CTC mandate, and no credible programme has been announced. We monitor for changes. |
| San Marino |
No mandate |
No mandate |
San Marino has no e-invoicing or transaction-level CTC mandate, and no credible programme has been announced. We monitor for changes. |
| São Tomé & Príncipe |
No mandate |
No mandate |
São Tomé & Príncipe has no e-invoicing or transaction-level CTC mandate, and no credible programme has been announced. We monitor for changes. |
| Saudi Arabia |
Mandate live |
Phase 2 waves since Jan 2023 |
Fatoora is fully operational. Phase 1 (generation) has applied to all resident VAT taxpayers since December 2021; Phase 2 (integration with ZATCA) has rolled out in revenue-based waves since January 2023, now reaching small businesses. |
| Senegal |
Announced — dated |
Finance law 2025 |
The finance law introduced mandatory electronic invoicing with implementation phases being defined. |
| Serbia |
Mandate live |
Since 2023 |
Mandatory B2B and B2G exchange through the national SEF platform since 2023. |
| Seychelles |
No mandate |
No mandate |
Seychelles has no e-invoicing or transaction-level CTC mandate, and no credible programme has been announced. We monitor for changes. |
| Sierra Leone |
No mandate |
No mandate |
Sierra Leone has no e-invoicing or transaction-level CTC mandate, and no credible programme has been announced. We monitor for changes. |
| Singapore |
Rollout underway |
GST InvoiceNow from Nov 2025 |
InvoiceNow GST transmission is phasing in: voluntary from May 2025, required for newly incorporated voluntary GST registrants from November 2025 and all new voluntary registrants from April 2026. |
| Slovakia |
Announced — dated |
Planned 2027 |
A domestic B2B e-invoicing and reporting mandate is planned for 2027, aligned with ViDA. |
| Slovenia |
Proposed |
Draft ~2027 |
Draft legislation for mandatory B2B e-invoicing (with reporting) has been under discussion targeting ~2027. |
| Solomon Islands |
No mandate |
No mandate |
Solomon Islands has no e-invoicing or transaction-level CTC mandate, and no credible programme has been announced. We monitor for changes. |
| Somalia |
No mandate |
No mandate |
Somalia has no e-invoicing or transaction-level CTC mandate, and no credible programme has been announced. We monitor for changes. |
| South Africa |
Proposed |
Under consultation |
SARS has signalled VAT modernisation including e-invoicing/real-time reporting; discussion documents published, no dates legislated. |
| South Korea |
Mandate live |
Since 2011 |
Electronic tax invoices with near-real-time transmission to the NTS have been mandatory for corporates and most individuals for over a decade. |
| South Sudan |
No mandate |
No mandate |
South Sudan has no e-invoicing or transaction-level CTC mandate, and no credible programme has been announced. We monitor for changes. |
| Spain |
Announced — dated |
B2B mandate pending; Verifactu 2026 |
The Crea y Crece B2B e-invoicing mandate awaits final regulations (expected phased start ~2027); separately, Verifactu certified-billing-software rules apply from 2026. |
| Sri Lanka |
Proposed |
Under study |
E-invoicing is under study within revenue-administration modernisation; no mandate legislated. |
| St. Kitts & Nevis |
No mandate |
No mandate |
St. Kitts & Nevis has no e-invoicing or transaction-level CTC mandate, and no credible programme has been announced. We monitor for changes. |
| St. Lucia |
No mandate |
No mandate |
St. Lucia has no e-invoicing or transaction-level CTC mandate, and no credible programme has been announced. We monitor for changes. |
| St. Vincent & the Grenadines |
No mandate |
No mandate |
St. Vincent & the Grenadines has no e-invoicing or transaction-level CTC mandate, and no credible programme has been announced. We monitor for changes. |
| Sudan |
No mandate |
No mandate |
Sudan has no e-invoicing or transaction-level CTC mandate, and no credible programme has been announced. We monitor for changes. |
| Suriname |
No mandate |
No mandate |
Suriname has no e-invoicing or transaction-level CTC mandate, and no credible programme has been announced. We monitor for changes. |
| Sweden |
Voluntary / partial |
B2G live |
B2G Peppol invoicing is mandatory; a B2B mandate is under study but not legislated. |
| Switzerland |
Voluntary / partial |
B2G > CHF 5k |
Suppliers to the federal administration must invoice electronically above CHF 5,000; no B2B mandate and none announced. |
| Syria |
No mandate |
No mandate |
Syria has no e-invoicing or transaction-level CTC mandate, and no credible programme has been announced. We monitor for changes. |