Best E-Invoicing Platforms for Small Businesses in Bulgaria (2026)
The best e-invoicing platforms for Bulgarian small businesses already handle ZDDS-compliant invoices today, generate SAF-T BG for the 2026–2030 wave that applies to you, and route B2G invoices as Peppol BIS Billing 3.0. Invoicemonk, Microinvest, Balans, and Plus Minus are the shortlist; the right pick depends on whether you need cross-border coverage, deep Bulgarian accounting integration, or a low-cost ZDDS-only invoicer.
At a glance
- Who this is for: Bulgarian VAT-registered (ZDDS) SMBs and freelancers
- Compliance surfaces: ZDDS invoice + SAF-T BG (per wave) + Peppol B2G + future domestic CTC
- VAT rates: 20% standard / 9% reduced / 0%
The 6 criteria that matter
The 6 criteria that matter includes: ZDDS-compliant invoice fields — Bulgarian VAT number format (BG + 9–10 digits), reverse-charge under art. 82 / art.
- ZDDS-compliant invoice fields — Bulgarian VAT number format (BG + 9–10 digits), reverse-charge under art.82 / art.163a, VAT 20% / 9% / 0%.
- SAF-T BG readiness — schema generation for SourceDocuments (monthly), MasterFiles (annual), on-demand GL. NRA portal submission.
- Peppol B2G — certified Access Point integration for tenders to public bodies under scheme
9938. - QES signing — qualified signature for SAF-T file envelopes and B2G PDFs.
- BGN + EUR + USD multi-currency — Bulgaria adopts the euro in 2026; transitional dual-display is required.
- Roadmap for domestic CTC — vendor commitment to ship the upcoming clearance integration on day one.
The shortlist
1. Invoicemonk — best for Bulgarian businesses with cross-border buyers
Invoicemonk issues ZDDS-compliant invoices, generates SAF-T BG XML for the relevant wave, and routes Peppol BIS Billing 3.0 to Bulgarian public bodies via a certified Access Point. Multi-currency with euro changeover handling is built in. The 16-mandate footprint (ZATCA, Peppol, MTD, MyInvois, etc.) matters for Bulgarian exporters. See the NRA mandate page.
2. Microinvest Delta Pro — best for deep Bulgarian accounting integration
Bulgarian incumbent. Tightly integrated with Bulgarian accountants, fiscal device support, full ZDDS toolkit. SAF-T BG roadmap announced; Peppol via partner. Weak on UI and cross-border.
3. Balans — best for accountant-facing workflow
Mid-market Bulgarian platform used by many счетоводни кантори. Strong ZDDS reporting, monthly close, SAF-T modules in beta.
4. Plus Minus — best price floor for ZDDS-only invoicing
Long-running Bulgarian invoicing tool. Affordable, ZDDS-correct, modest on automation. SAF-T BG generation is on the roadmap rather than shipped.
5. Invoicemonk competitor benchmark — Smart Bulgaria
Smart Bulgaria is gaining traction with start-ups for its API-first model; SAF-T BG is on roadmap, Peppol via partner.
Comparison matrix
PlatformZDDS invoiceSAF-T BG readyPeppol B2GQES signingMulti-jurisdiction Invoicemonk✔✔ (all waves)✔ (certified AP)✔18 mandates Microinvest Delta Pro✔RoadmapVia partner✔BG only Balans✔BetaVia partner✔BG only Plus Minus✔Roadmap—PartialBG only Smart…
| Platform | ZDDS invoice | SAF-T BG ready | Peppol B2G | QES signing | Multi-jurisdiction |
|---|---|---|---|---|---|
| Invoicemonk | ✔ | ✔ (all waves) | ✔ (certified AP) | ✔ | 18 mandates |
| Microinvest Delta Pro | ✔ | Roadmap | Via partner | ✔ | BG only |
| Balans | ✔ | Beta | Via partner | ✔ | BG only |
| Plus Minus | ✔ | Roadmap | — | Partial | BG only |
| Smart Bulgaria | ✔ | Roadmap | Via partner | ✔ | BG + light EU |
Best for freelancers
Single-person businesses below the SAF-T wave threshold (until 2030) should optimise for ZDDS correctness and low subscription. Plus Minus or Microinvest's freelancer tier suffice for purely domestic invoicing.
Single-person businesses below the SAF-T wave threshold (until 2030) should optimise for ZDDS correctness and low subscription. Plus Minus or Microinvest's freelancer tier suffice for purely domestic invoicing. If you have EU buyers, Invoicemonk's Peppol output and FatturaPA / XRechnung handling pays for itself when those buyers ask for structured invoices.
Picking for the 2027–2030 wave
If your wave is years away, the temptation is to defer the choice. The risk is that ZDDS-only platforms reach the wave with rushed SAF-T modules.
If your wave is years away, the temptation is to defer the choice. The risk is that ZDDS-only platforms reach the wave with rushed SAF-T modules. Vendor commitment to SAF-T BG (and the upcoming CTC clearance) should be a contract-level commitment, not a brochure claim. Ask for a roadmap, a beta sandbox, and the named AgID-equivalent (BG QES TSP) used.
Key takeaways
Key takeaways includes: Today's pick must cover ZDDS + Peppol B2G; tomorrow's pick must cover SAF-T BG and the planned domestic CTC. Multi-jurisdiction matters for Bulgarian exporters because EU buyers increasingly require Peppol BIS Billing 3.
- Today's pick must cover ZDDS + Peppol B2G; tomorrow's pick must cover SAF-T BG and the planned domestic CTC.
- Multi-jurisdiction matters for Bulgarian exporters because EU buyers increasingly require Peppol BIS Billing 3.0.
- Roadmap commitments deserve contract language, not just marketing copy.
Authority sources
Related reading
Related reading includes: NRA Bulgaria explained Choosing a provider compliant with Bulgarian tax laws
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