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
1What was in the Marks and Spencer sale last year?
M&S had up to 50 per cent off selected lines on Boxing Day in 2017.
Those offers included £5 magnums of Champagne and Prosecco, 30 per cent off selected Christmas drinks as well as other offers on party nibbles.
There were deals to be found on fashion, including 3 for 2 on women's hats, scarves and gloves.
Menswear and children's clothes were discounted by up to 30 per cent as well.
What will be in Marks and Spencer's sale in 2018?
It's worth looking out for deals on fashion from Boxing Day onward, as there will likely be wide-ranging sales on clothes for women, men and children.
Furniture reductions can be expected as well as kitchenware and homeware.
We'll be updating this article when we get more information about the sales.
Our tips for finding the best deals this Boxing Day
PREPARE Research the items you want to buy and find out the cheapest price. Websites like PriceSpy, PriceHistory and CamelCamelCamel will give you historical data on prices so you can see how much you should pay.
GET FOLLOWING Follow your favourite shops on Twitter, Facebook and Instagram and sign up to its deals newsletter to get the latest on any offers. We post the best deals in our Sun Money FB group too.
EARN CASHBACK Check websites like Quidco and TopCashback BEFORE you place your order. Cashback websites PAY you to shop. All you have to do is click through their links and the money is added to your online account, usually within 14 days.
CHECK FOR CODES Take a look at The Sun Vouchers, and see if you can get extra savings with discount codes.
New year, new you? December 26th is the best time to update your look – get a heads up on upcoming fashion and footwear sales here, and shop the best Boxing Day 2018 beauty deals here.
Or, new decor…hit refresh come January when furniture and homewares are often half price – these are the best sales to bookmark.
If you're looking to turn your house into a smart home, or you just want to blast some Zombies on COD, these are the best tech and gaming deals you'll find.
How much does shipping from Marks and Spencer cost?
Standard delivery on orders over £50 is free, or costs £3.50 under than amount, while click and collect is free.
Nominated day day delivery costs £3.99 and nominated time slot delivery costs £5.99.
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