The starting point for lockdown fines in England will rise to £100 from Wednesday.
The first fine will be lowered to £50 if paid within 14 days, according to the Home Office.
Fines will double for each repeat offence, up to a maximum of £3,200.
Currently the fine for a first offence is £60 and more than 9,000 have been issued across the country.
It is not yet clear if the same changes to fines will be adopted in Wales, Scotland and Northern Ireland.
