New COVID-19 rules make quarantine when entering Hungary from abroad, law. No separate administration decision is no longer needed. Hotels are no longer able to accept tourists.
At the same time fees for breaking quarantine have increased to dissuade those thinking of doing so. The fees have increased from HUF 50,000 to HUF 150,000 (maximum fine).
The fee issued can be anywhere between 5000 HUF and the maximum.

Across Europe, governments have issued lockdowns for the month of November to curb rising infection rates in what is considered a second wave of the virus.
Likewise, the Hungarian government has declared a state of emergency for the entire territory of Hungary to help contain the coronavirus pandemic and protect the health and lives of Hungarian citizens.
The government decree declaring the emergency came into force on Wednesday, November 4th; the key restrictions include:
A curfew between midnight and 5 a.m.
From midnight to 5 a.m., everyone is obliged to stay home and can only leave for work.
COVID-19 Update: New restrictive measures to come into force
The Hungarian government introduced tougher restrictive measures last week to curb the spread of coronavirus as hospitals may struggle to handle the growing caseload.
The government extended the curfew introduced earlier on the 4th November to be in force between 8pm and 5am, and restricted opening hours of shops and other businesses starting at midnight on Tuesday last week (10th Nov), in measures similar to those in force in Austria.
All gatherings are prohibited and restaurants are closed except for home deliveries. Company canteens can stay open. Shops and services such as hair salons have to close at 7pm, and hotels can only receive business travelers but not tourists.
No more than ten people are allowed to gather at private events or family gatherings, and sporting events are held behind closed doors.
Universities and secondary schools above the eighth grade returned to digital education while facilities for children under the age of 14 remained open. Hospital employees, school and kindergarten teachers, and nursery employees will be tested weekly.
The measures will be imposed for 30 days and will be reassessed afterward.
Free parking
In Debrecen and other cities with county status, more frequent transportation will be provided from 7 a.m. to 9 a.m. and from 3 p.m. to 7 p.m. on working days. The government has also decided to not charge for parking in public areas.
Source : AboutHungary.hu (the Governments official portal for COVID-19)