Answer

For Śvetāmbara Paryushan 2026, the festival runs from Tuesday, 8 September 2026 to Tuesday, 15 September 2026 (Samvatsari). ( msjs.org.au)

A common Siddhi Tap vidhi is described as a 44-day observance, with 36 actual fasting days and breaks in between. ( jainsite.com)

So, if you want Siddhi Tap parna to coincide with Samvatsari, you would begin on Sunday, 3 August 2026. ( msjs.org.au)

Explanation

This date is based on counting 44 calendar days backward from 15 September 2026. If your local sangh or panchang follows a slightly different observance, the date may shift by a day. Paryuṣaṇ is especially the Śvetāmbara festival, while Digambara Jains observe Daśa-lakṣaṇa-parvan separately. ( jainpedia.org)

Spiritual Understanding

For a tapasvi, aligning Siddhi Tap with Paryushan can deepen discipline, forgiveness, and inner purity during the holiest days of the Jain year. The most important thing is to keep the vrata with श्रद्धा, humility, and proper vidhi. ( jainpedia.org)

Takeaway

If your goal is to complete Siddhi Tap on Samvatsari 2026, start on 3 August 2026. ( msjs.org.au)