The price of plastic bags is expected to double, going up to 10p and extended to every shop.
Theresa May is expected to announce the changes as part of wider plans to tackle single-use plastic.
At the moment, only shops that employ more than 250 people have to charge at least 5p a bag.
Under the new measures, the fee will go up to 10p a bag and include all retailers.
Donations from the bag levy have so far raised over £58.5 million, with £31.5 million donated to charities, health or environmental causes, according to the government.
It’s now thought an additional “latte levy” could also be introduced to combat the waste of single-use coffee cups.