QAZA NAMAZ
To make a Namaz Qaza without genuine Shariat reason is a big sin and to pray the Namaz is Farz and is necessary to perform repentance with sincerity. By the use of repentance or having the Hajj accepted will eradicate the sin for delaying the Namaz [Durr-e-Mukhtar].
Rule: Repentance is only correct when the Qaza is prayed and if you perform repentance but continue not to pray the Qaza or continue committing the sin then this is not repentance [Radd-ul-Mohtar]. It is quoted in the Hadith that a person who performs Tauba (repentance) but continues performing that sin then he has not performed repentance but is playing a joke with Allah.
Description of Qaza
Rule: Whatever a servant has been ordered, then to perform that act on time is known as Ada, and if the time passes then it is known as Qaza.
Rule: If you perform Tahrima within the time then the Namaz is not Qaza but it is Ada, however, the exception to this rule is for the Namaz of Fajr, Ju'ma or Eid Namaz whereby the final salaam has to be performed before the time has ended [Durr-e-Mukhtar, Bahar].
Rule: If a Namaz becomes Qaza due to sleeping or by forgetting then to pray the Qaza is Farz but the sin for Qaza does not apply, however once awake or remembering and as long as the time is not Makrooh then you must pray it immediately and to deiay will be a Makrooh [Alamgiri].
Rule: The Qaza of Farz Namaz is Farz, the Qaza of Wajib is Wajib and the Qaza of Sunnat is Sunnat for those Sunnats that carry a Qaza such as the Sunnats of Fajr when the Farz has also been missed and the first Sunnats of Zohr when the Farz has been prayed and the time of Zohr has not finished [Alamgiri, Durr-e-Mukhtar, Radd-ul-Mohtar].
Time of Qaza
Rule: There is no fixed time for praying Qaza as whenever it is prayed the duty will be fulfilled except for sunrise, just before sunset and exact midday, as no Namaz is allowed during these times [Alamgiri].
Rule: Whichever Namaz has been missed has to be prayed like that, for example, if a four Rakat Namaz has been missed whilst on a journey then only two Rakats will be prayed when praying it's Qaza even if you are praying it back at home and if a four Rakat Namaz was made Qaza at home then if you pray it on a journey you will still have to pray four Rakats. If there is a problem when praying Qaza then you are allowed to accommodate for that meaning, if when the Namaz was made Qaza you were allowed to stand and pray and now you are unable to stand and pray and therefore have to sit and pray the Namaz then you are allowed to do this and when you get better there is no need to repeat this Qaza [Alamgiri].
Which Qaza Namaz is forgiven
Rule:If a person is so ill that they cannot pray Namaz even by actions and if this situation remains for six Namaz then the Qaza Namaz is not Wajib [Alamgiri].
Rule: If a mental person has missed Namaz during his illness and it has been for a period of more than six Namaz continuously then there is no need to perform Qaza [Alamgiri].
Rule: If there is enough time to pray both Qaza and Ada in short then you can do this and if by expanding the praying then there is not enough time to pray both Namaz then the routine (Tarteeb) is still Farz and if by missing all allowed things but not Wajibs or Farz in Namaz you can pray both, then this should be done if possible [Alamgiri].
