There is no obligation of Zakat as pointed on by Dr. Irfan Shahzad Sahab, but on savings which are in excess of personal and business use whether of the present or of the future, there is an obligation to help society in case a need or appeal arises. This is in accordance with Quran 2:219:
یَسۡـَٔلُوۡنَکَ عَنِ الۡخَمۡرِ وَ الۡمَیۡسِرِؕ قُلۡ فِیۡہِمَاۤ اِثۡمٌ کَبِیۡرٌ وَّ مَنَافِعُ لِلنَّاسِ ۫ وَ اِثۡمُہُمَاۤ اَکۡبَرُ مِنۡ نَّفۡعِہِمَا ؕ وَ یَسۡـَٔلُوۡنَکَ مَا ذَا یُنۡفِقُوۡنَ ۬ؕ قُلِ الۡعَفۡوَؕ کَذٰلِکَ یُبَیِّنُ اللّٰہُ لَکُمُ الۡاٰیٰتِ لَعَلَّکُمۡ تَتَفَکَّرُوۡنَ
They ask you about drinking and gambling [because in their society these are also a means of helping the poor]. Tell them: ‘There is great sin in both, [and no doubt] they have some benefit for people; but their sin is far greater than their benefit’. And they ask you [to explain] what they should spend [in charity]. Tell them: ‘Whatever is above your needs [27].Thus God explains to you His verses so that you may reflect on the matters of both this world and of the next. (Quran 2:219)
(Excerpt from Al-Bayan: Javed Ahmed Ghamidi)
(English Rendering by Dr. Shehzad Saleem)
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[27]. After repeated questions on this topic, the Quran has replied that after setting aside money for personal and business use whether of the present or of the future what remains is the right of the society they live in. The obligation of infaq pertains to this over and above amount. This is the utmost limit of the obligation of infaq that is imposed on a Muslim by his Creator. He is not required to do anything over and above this.
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For further Details, please refer to the videos of Ghamidi Sahab in the following thread:
Discussion 31989