The 183-Day Rule in Bulgaria: How Days Are Counted (With Examples)

The 183-day rule is the most straightforward path to Bulgarian tax residency. Spend more than 183 days on Bulgarian territory within any 12-month period, and you become a tax resident for that calendar year. Your worldwide income is then taxed at Bulgaria's flat 10% rate — the lowest in the European Union.

But how exactly are those days counted? Do partial days matter? What about short trips abroad? What happens if you land at precisely 183 days? This article answers every counting question we encounter in practice, with three detailed scenarios and the exact legal provisions you need to know.

What Is the 183-Day Rule?

The 183-day rule is the primary criterion for establishing tax residency in Bulgaria. It is codified in Article 4, paragraph 1, point 2 of the Income Taxes on Natural Persons Act (ЗДДФЛ) — known in English as the IDDPA or sometimes IDDFL.

The rule states: a natural person is considered a local (tax resident) person if they reside on the territory of the Republic of Bulgaria for more than 183 days in any 12-month period. Upon meeting this criterion, the individual becomes a Bulgarian tax resident for the calendar year in which the 183rd day is exceeded.

This is one of two independent paths to tax residency. The other is the centre of vital interests test, which does not require 183 days of physical presence. Both paths lead to the same result: worldwide income taxation at 10%.

Legal Basis: Article 4 of the ЗДДФЛ

Article 4 of the ЗДДФЛ defines four criteria for Bulgarian tax residency. Meeting any one makes you a tax resident:

1. Permanent address in Bulgaria (alone, this is rarely sufficient without other ties)
2. More than 183 days of physical presence in any 12-month period
3. Centre of vital interests in Bulgaria — personal and economic ties
4. Sent abroad by a Bulgarian state institution or employer (diplomats, government personnel)

The 183-day rule (criterion 2) is the most commonly used and the easiest to prove objectively. The National Revenue Agency (NRA) considers it the strongest basis for issuing a Tax Residency Certificate.

Article 4, paragraph 5 adds an important exception: periods spent abroad solely for education or medical treatment do not interrupt an individual's status as a Bulgarian tax resident if they already qualify under another criterion. However, these days abroad do not count toward the 183-day total when establishing residency for the first time.

How Days Are Counted: The Rules

Partial Days Count as Full Days

Both the day of arrival and the day of departure count as separate, full days of presence in Bulgaria. There is no minimum-hours requirement. If you land in Sofia at 11:55 PM, that counts as day one. If you depart at 6:00 AM the next morning, that departure day is also counted.

This is explicitly stated in the law: the days of entering and leaving the country shall each be regarded as a day of stay within the territory of Bulgaria.

Rolling 12-Month Period, Calendar-Year Assignment

The 183-day count operates on a rolling 12-month window — any consecutive 12 months, not necessarily January to December. However, the tax residency resulting from exceeding 183 days is assigned to the calendar year in which the threshold is crossed.

This means:

• If you arrive on March 1, 2026, and stay continuously, you cross 183 days on August 31, 2026. You are a 2026 tax resident.
• If your 12-month period spans November 2025 through October 2026, and you reach 183 days in June 2026, you are a 2026 tax resident.
• Tax residency applies to the entire calendar year — not just from the date you crossed the threshold.

What Counts as "Presence"?

Physical presence on Bulgarian territory is the only criterion. It does not matter what you were doing — working, vacationing, sleeping, or sitting in an airport transit zone at Sofia Airport. If you were physically in Bulgaria, the day counts.

Days that do count:

• Days spent in any Bulgarian city, town, or rural area
• Days in transit through Bulgaria (including overnight layovers)
• Weekends, public holidays, and sick days while in Bulgaria
• Days working remotely from Bulgaria for a foreign employer

Days that do not count:

• Days physically outside Bulgarian territory (travel, holidays abroad)
• Days in Bulgaria solely for education or medical treatment (under Art. 4(5), these do not count toward establishing the 183-day threshold)

Schengen Entry/Exit Stamps — No Longer Available

Before January 1, 2025, travelers entering Bulgaria by land received entry and exit stamps in their passports, which served as convenient proof of presence. Since Bulgaria became a full Schengen Area member on January 1, 2025 — with the lifting of all internal land border controls — passport stamps are no longer applied at borders with Romania, Greece, or other Schengen countries.

This means that if you enter Bulgaria from another Schengen country, there is no official border stamp to prove your entry date. You must rely on alternative documentation (see the proof section below). Stamps are still applied at the external Schengen border — for example, when entering from Turkey or Serbia.

Three Practical Counting Examples

What Counts as Proof of Presence?

The NRA does not maintain a centralized database of every individual's days in Bulgaria. When you apply for a Tax Residency Certificate, or during a tax audit, the NRA may request evidence of your physical presence. The burden of proof is on you.

Accepted forms of evidence include:

• Border crossing records — The NRA can request reports from the Border Police General Directorate, which maintains entry/exit records for non-Schengen crossings and historical data
• Flight boarding passes and booking confirmations — Showing arrival/departure dates to and from Bulgarian airports
• Rental agreement or property deed — Proving you have a residence in Bulgaria
• Utility bills — Electricity, water, internet, and heating bills in your name showing consumption patterns
• Bank transaction records — Card payments and ATM withdrawals in Bulgaria, showing dates and locations
• Medical records — GP visits, dental appointments, prescriptions filled in Bulgaria
• Employment or freelancer registration — NRA registration as a freelancer or employment contract with a Bulgarian company
• Social security contribution records — Monthly declarations filed with the NRA
• Gym memberships, subscriptions, and check-in logs — Any service that records your physical usage dates

What Happens at Exactly 183 Days?

The law requires more than 183 days — meaning 184 days or more. At exactly 183 days, you do not meet the threshold under this criterion.

However, this does not necessarily mean you are not a tax resident. You may still qualify through the centre of vital interests test — if Bulgaria is where your primary personal and economic ties are located. In practice, if you have 183 days plus a registered business, a Bulgarian bank account, and a rental agreement, the NRA is highly likely to recognize your tax residency.

Tax Implications: What Changes at Day 184

Once you become a Bulgarian tax resident — through the 183-day rule or any other criterion — Bulgaria taxes your worldwide income. This applies to the entire calendar year, not just from the date you crossed the threshold.

If you were previously tax resident in another country, the applicable double taxation treaty determines how conflicting residency claims are resolved and prevents the same income from being taxed twice.

Common Misunderstandings

1. "183 days means 6 months"

Not exactly. Six months can be 181, 182, or 183 days depending on which months. The law specifies 183 days, counted individually — not "six months." Always count actual days.

2. "Only working days count"

No. Every calendar day of physical presence counts — weekends, holidays, sick days, vacation days. The law makes no distinction between working and non-working days.

3. "I need to be in Bulgaria continuously for 183 days"

No. Days do not need to be consecutive. You can leave and return multiple times. The total of all days of physical presence within the 12-month period is what matters.

4. "If I stay under 183 days, I cannot be tax resident"

Incorrect. The centre of vital interests test provides a second, independent path to tax residency. If your primary personal and economic ties are in Bulgaria, you may be tax resident even with fewer than 183 days of presence.

5. "My home country determines my tax residency, not Bulgaria"

Each country applies its own domestic law to determine tax residency independently. It is entirely possible to be a tax resident of two countries simultaneously under their respective domestic laws. The double taxation treaty between the two countries then provides tie-breaker rules to allocate primary taxing rights.

Interaction with Double Tax Treaties

Bulgaria has signed double taxation agreements with over 70 countries, including Germany, France, the Netherlands, the United Kingdom, Austria, Switzerland, the United States, Canada, and most EU member states. These treaties follow the OECD Model Tax Convention.

When both Bulgaria and your home country claim you as a tax resident, the treaty provides tie-breaker rules in the following hierarchy (Art. 4(2) of the OECD Model):

1. Permanent home — Where do you have a dwelling available for continuous use?
2. Centre of vital interests — Where are your closest personal and economic ties?
3. Habitual abode — In which country do you spend more time?
4. Nationality — Which country's citizenship do you hold?
5. Mutual agreement — If all four tests fail, the competent authorities of both countries negotiate.

The 183-day rule establishes your Bulgarian tax residency under domestic law. The treaty tie-breaker then determines which country has the primary right to tax your worldwide income. This is why we recommend combining 183+ days with a permanent home and centre of vital interests in Bulgaria — it satisfies multiple levels of the tie-breaker hierarchy simultaneously.

Frequently Asked Questions

Disclaimer: This article provides general information about Bulgarian tax law and does not constitute legal or tax advice. Tax residency determinations depend on individual circumstances. Consult our team for advice tailored to your specific situation. Last updated: April 7, 2026.