Lev → Euro — adoption on 1 January 2026

On 1 January 2026, Bulgaria gave up the lev (BGN, its currency since 1880) to adopt the euro, becoming the 21st euro-area member. The twist: the lev had already been "glued" to the euro for a long time, via a currency board (a regime in which the central bank guarantees an absolutely fixed exchange rate) introduced in 1997. The irrevocable conversion rate is EUR 1 = BGN 1.95583. For invoices, this changes the reference currency and imposes strict rounding rules.

History — from the 1997 currency board to the 2026 euro

In 1996-1997, Bulgaria went through a hyperinflation crisis that wrecked the lev. To restore confidence, the country introduced on 1 July 1997 a currency board (валутен борд): the lev money supply is fully backed by foreign-exchange reserves at a fixed exchange rate. The lev was first pegged to the Deutsche Mark, then, with the euro's launch in 1999, mechanically switched to the euro at the inherited parity: EUR 1 = BGN 1.95583.

For nearly three decades, the lev was thus, in effect, a disguised euro. Bulgaria joined ERM II (the exchange rate mechanism) and the banking union in July 2020. The EU Council approved adoption on 8 July 2025, and the euro entered force on 1 January 2026. Because of the currency board, the conversion "shock" is gentler than elsewhere: the rate has not changed since 1999.

1997-07-01 | Introduction of the currency board (валутен борд) after the
           | 1996-1997 hyperinflation crisis. The lev is first pegged to the
           | Deutsche Mark.
           |
1999       | With the euro's launch, the peg mechanically switches to the
           | euro: EUR 1 = BGN 1.95583 (parity inherited from the DEM).
           |
2020-07-10 | Bulgaria joins ERM II (European exchange rate mechanism) and the
           | banking union — the euro-area antechamber.
           |
2025-07-08 | The EU Council adopts the decisions opening Bulgaria's entry into
           | the euro area on 1 January 2026.
           |
2026-01-01 | Euro adoption. 21st euro-area member. Fixed irrevocable rate
           | EUR 1 = BGN 1.95583. Dual circulation lev + euro.
           |
2026-02-01 | End of dual circulation: the euro becomes the sole legal
           | currency, after 146 years of the Bulgarian lev.

Governance — BNB + Ministry of Finance

The Българска народна банка (BNB — Bulgarian National Bank, bnb.bg) steered the currency board and the euro transition, joining the Eurosystem (the ECB and the euro-area national central banks). The Министерство на финансите (Ministry of Finance) coordinated the regulatory and fiscal side of the switch.

The official portal evroto.bg centralises public information on adoption. Conversion rules follow EU law (Regulation (EC) No 1103/97 and Regulation (EC) No 974/98): a six-significant-digit fixed rate, a ban on rounding the rate itself, and rounding of only the final result to the cent.

Technical schema — rate, rounding, dual display

Conversion follows one strict rule: divide the BGN amount by the fixed rate 1.95583, then round the result to the nearest cent. You never use an inverted rounded rate or an intermediate currency.

# Official conversion — EU rule (Regulation 1103/97)
# Fixed rate: EUR 1 = BGN 1.95583  (6 significant digits, not rounded)

BGN amount → EUR:  amount_EUR = amount_BGN / 1.95583
  then round to the nearest cent (2 decimals, commercial rounding)

Examples:
  BGN 100.00  → 51.1292...  → EUR 51.13
  BGN  19.56  →  10.0008... → EUR 10.00
  BGN   1.00  →  0.5113...  →  EUR 0.51

# Forbidden: never re-round through a third currency.
# Do not use an inverted rounded rate (e.g. 0.51 EUR/BGN):
# always divide by exact 1.95583.

• 6-significant-digit rate — 1.95583, never truncated or rounded.
• Divide then round — convert, then round to the cent (not the other way round).
• Dual price display — during the transition period, displaying prices in both lev AND euro was mandatory in retail.
• Contract continuity — BGN contracts remain valid, automatically denominated in euros at the fixed rate (principle of legal continuity).

Bulgaria vs other euro adoptions

Bulgaria's singularity is the length and stability of its peg: nearly three decades of a currency board at the same rate. The 2026 conversion validates a de facto parity unchanged since 1999 — a rare case in Europe.

Adoption — dual circulation and invoicing

• January 2026: dual circulation. Lev and euro accepted; payment in lev possible but change given in euros, to withdraw the lev gently.
• 1 February 2026: euro only. End of dual circulation, the euro becomes the sole legal currency.
• Dual price display. Mandatory in retail during the transition, to protect consumers from abusive rounding.
• Systems reconversion. ERP, tills, EDI (CUX), Peppol and SAF-T switch to EUR; BGN history stays traceable at the fixed rate.

Common pitfalls

• Rounding the rate. Using 1.96 or 1.9558 instead of 1.95583 introduces cumulative discrepancies. The rate has exactly 6 significant digits.
• Inverted rate. Converting with a rounded 0.51129 EUR/BGN instead of dividing by 1.95583 distorts amounts. Always divide by the official rate.
• Double rounding. Rounding line by line then the total creates discrepancies; follow the single-rounding rule on the final result.
• BGN invoice after February 2026. Non-compliant — the legal currency is the euro. Update all templates.
• Forgetting contract continuity. A BGN contract stays valid, automatically converted; it need not be renegotiated, only denominated in euros.

Cross-links

• Bulgaria hub — full view
• ДДС — VAT regimes (20 / 9 / 0%)
• SAF-T 2026 — accounting reporting
• Retail EDIFACT — INVOIC EUR switch
• Peppol B2G — EUR currency
• BNB — Българска народна банка
• evroto.bg — official euro adoption portal