7. Ensure that you do not give less than the amount that is obligatory upon you. Zakaat must be discharged after correctly calculating the amount that is due. Do not merely estimate the amount and discharge zakaat, as it is possible that you may estimate a lesser amount and fail to discharge your zakaat correctly. 

8. Refer to the Ulama to learn the correct method of calculating zakaat. ^[1]

^[1] وَمَا أَرْسَلْنَا مِنْ قَبْلِكَ إِلَّا رِجَالًا نُوحِيْ إِلَيْهِمْ فَاسْئَلُوْا أَهْلَ الذِّكْرِ إِنْ كُنْتُمْ لَا تَعْلَمُوْنَ (سورة النحل: 43)