Primark owner Associated British Foods says it hopes to offload millions of pounds worth of clothing stock when its shops reopen in England on 12 April.
The High Street giant does not offer online sales and says it expects to have lost £1.1bn in sales due to the latest lockdown closures.
It plans to sell more than £400m of last year’s stock to help plug the gap.
Primark said its 153 stores would reopen in England on 12 April, and in Scotland on 26 April.
Unlike rivals, the retailer had no online operation to shift stock when stores were closed during lockdowns.
But Primark is not set up to sell online, and has said the costs involved in distribution and sales online would mean price rises for customers.
Primark’s £1.1bn sales drop contrasts with online only fashion retailers such as Asos and Boohoo, whose sales rose by around 40% in the last four months of 2020.