When the Prophet (ﷺ) broke his fast, he would say:
ذَهَبَ الظَّمَاءُ وَابْتَلَّتِ الْعُرُوْقُ وَثَبَتَ الْأَجْرُ إِنْ شَاءَ اللَّهُ
Transliteration
Dhahabadh-dhama'u wabtallatil-'urooqu, wa thabatal-'ajru 'inshaa'Allah
Translation
The thirst is gone, the veins are moistened and the reward is confirmed, if Allah wills.
At iftar time, this dua thanks Allah for ending the fast. It asks for reward and Barakah. Muslims remember Ramadan blessings with every sip and bite.
Before eating at iftar, say this: Allahumma inni laka sumtu wa bika aamantu wa alayka tawakkaltu wa ala rizq-ika-aftartu. This is the dua for breaking fast.
Follow the sunnah of Prophet Muhammad (peace be upon him). The correct dua for iftar is: Dhahaba al-zama wa'btalat al-'uruq wa thabata al-ajr in sha Allah.
At sunset, say: Allahumma inni laka sumtu wa bika aamantu wa alayka tawakkaltu wa ala rizq-ika-aftartu. Then eat or drink. This is the dua for breaking the fast.
Say Bismillah - it means In the name of Allah. Want extra blessings? Add: Allahumma barik lana fima razaqtana waqina 'adhab an-nar.
It means: the thirst is gone, the veins are moistened and the reward is confirmed, if Allah wills. Full dua: Dhahaba al-zama wa'btalat al-'uruq wa thabata al-ajr in sha Allah.