Is it permissible to fast after 15th Sha‟baan?

Answer

It is permissible to fast even the whole month of Sha'baan. It is meritorious and Sunnah to fast on the 13th, 14th and 15th of every Islamic month. The 15th day of Sha'baaan has greater significance. One should fast on the 15th Sha'baan. However, do not fast on the 29th if it is not your standard practice to fast on the day that the 29th falls, e.g. if it is your practice to fast every Thursday, then you may fast on the 29th if it happens to be a Thursday.