And that means savvy shoppers could get the chance to save on everything from food to furniture once Christmas Day is in the rear view.
The high street giant stocks a huge range of goods which means there should be something for everyone if you're determined to sniff out a bargain.
Last year there was up to 50 per cent off selected stock when the sales kicked off on December 26.
Although, before you start splashing the cash, we recommend writing down a checklist of the items you'd like to buy ahead of the sales, and noting prices, so you can spot a bargain when you see one.
And remember to shop around in the sales period, as there's tons of offers from different stores live at the same time, meaning you can save yourself a bundle with a bit of bargain hunting.
- Shop Marks and Spencer's sale here