Bulgaria Tax Residency (183-day rule)

Key parameters
Threshold	183 days
Period / Window	Rolling 12 months
Counting	Any part of a day
Alternative	Center of vital interests test
Additional requirements	Permanent address with ties

Bulgaria has 2 practical routes into tax residency, and the day count is only the first.

The 183-day rule measures presence across a 12-month period rather than a fixed calendar year, while the residency it produces attaches to the calendar year in which you passed the threshold. Those 2 things are easy to conflate: a rolling measurement producing a calendar-year status.

The center of vital interests is the second route, and it needs no days at all. It looks at where your personal and economic life is anchored — family, property, the place you work from or run a business, the place you manage your assets from. Someone whose life is plainly based in Bulgaria can be resident on a very low day count.

A permanent address in Bulgaria is often assumed to be a third route. It is not, on its own. An address only makes you resident where your center of vital interests is also in the country, so registering one changes nothing by itself.

• The rolling window and the calendar year do different jobs. The count runs across any 12 months, but the resulting status lands in the calendar year the threshold was crossed in.
• A permanent address alone doesn't make you resident. Registering an address in Bulgaria only matters where your center of vital interests is there too, so it isn't a shortcut on its own.
• You can be resident on a low day count. Where family, property and business all sit in Bulgaria, the vital-interests limb can attach even to someone who spends most of the year elsewhere.
• A tax residency certificate is issued on evidence, not on request. The National Revenue Agency treats the day count as the strongest basis for issuing one, so the vital-interests route can be harder to document.
• Bulgaria taxes residents at a flat rate on worldwide income. The status changes the scope of the charge rather than the rate, which is the same for residents and nonresidents on Bulgarian-source income.

Residents are taxed on worldwide income while nonresidents pay only on Bulgarian-source income, so an incorrect position usually surfaces as foreign earnings left off a return. Late filing attracts a fine, and unpaid tax carries interest calculated daily at the European Central Bank main refinancing rate plus 8 percentage points, running from the original due date until the balance is cleared. Professional tax advice is strongly recommended in situations like this.

A rolling window that crosses a year end

You arrive in Sofia in August and stay through to the following July. No calendar year holds more than 183 days on its own, but the rolling 12-month window does, and you become resident for the calendar year in which you crossed day 183.

Ties that decide it without the days

You spend about 120 days a year in Bulgaria, but your spouse and children live there, you own the family home, and you run your business from it. The day count falls short, yet the center of vital interests makes you resident.

An address that changes nothing

You register a permanent address in Bulgaria for administrative convenience but live and work in another country, with no family or business there. The address alone doesn't make you resident, and neither test is met.

• OECD — Bulgaria: information on residency for tax purposes
• National Revenue Agency of Bulgaria