Yes, you require permits to go on an ABC trek! Except for Nepali citizens, all trekkers must obtain permits everywhere they trek in Nepal. If you're trekking to Annapurna Base Camp, you'll need two distinct permits: TIMs (Trekkers Information Management System) and ACAP (Annapurna Conservation Area Permit) (Annapurna conservation area permit). The TIMs card comes in two colors: green and blue. The green TIMs card is for individual visitors and costs US$ 20 per person plus the permit. The blue TIMs card is for group trekkers and costs US$ 10 per person plus the permit. TIMS costs US$ 20 for SAARC nationalities, while the permit costs US$ 2. You should keep these documents with you while trekking inside the Annapurna conservation area, and you will be required to show them at checkpoints. TIMS Cost for individual trekkers: SAARC Countries: US$ 6 Other Countries: US$ 20 TIMS Cost for Group: SAARC Countries: US$ 3 Other Countries: US$ 10 ACAP entry permit per person: SAARC Countries: US$ 2 Other countries: US$ 30