Mazda will pay the VAT and give 0% finance on most of its models until the end of February 2012.
Mazda says the offer could save customers as much as 4000.
The no-VAT offer was launched for the diesel Mazda 6 in November, and has now been extended to include 2, 3, 5 and MX-5s registered by February 29, 2012.
The offer on the Mazda 6 will run until March 31, and now includes petrol as well as diesel models.
Mazda is also offering 0% APR for customers who want to finance their new car over a four-year period. The offer requires a 30% deposit on the Mazda 3, 5 and 6, while a 50% deposit is needed for the 2 and MX-5 models.
The offers apply to cars in stock, and are available while stocks last.