All fixed rates available at 90% LTV will be cut by 0.30% and fixed and tracker rates at 80% LTV and 85% LTV by 0.10% for new applications.
First-time buyers will continue to receive a £500 discount on the product fee for all mortgages with a £900 product fee.
An additional 0.1% reduction is available on all rates for new applications from existing Nationwide mortgage customers.
Tracie Pearce, head of group mortgages at Nationwide, said: “These reductions at 80-90% LTV demonstrate how Nationwide is committed to supporting both first-time buyers and home movers, enabling those with smaller deposits to access very competitive rates.
“In particular, the reduction of two year fixed rates available up to 90% LTV by 0.30% means that we are offering rates to both new and existing customers below 4%.”