Two-year fixed rates are available from 1.72% at 90% LTV and 3.09% at 95% LTV. Five-year fixed rates start from 2.39% at 90% LTV and 3.75% at 95% LTV.
All four Help to Buy ISA mortgages come with a £495 fee and free standard valuation.
Janice Barber, mortgage manager at Yorkshire Building Society, commented: “We understand how tough it can be for first-time buyers to take that initial step on the property ladder and we’re constantly looking at ways we can help them to own their own home.
Our latest First-Time Buyers Report showed almost half of those saving for their first property are doing so with a Help to Buy ISA. We’ve launched this exclusive new range of mortgages to directly appeal to this group of prospective borrowers with the aim of offering a competitive rate and an excellent service to help guide them through their first home-buying experience.”