A 2-year fixed rate at 5.79% with a £999 product fee will be added to its corporate range.
A 5-year fixed rate at 6.39% with a £999 product fee will be added to its core range.
The lender will also be increasing rates by 0.2% on a selection of fixed rate remortgages on both its core and corporate ranges.
Mark Bullard, head of sales at NatWest Intermediary Solutions, said: “With the challenge of raising a large enough deposit still being the biggest issue for first-time buyers, I am delighted that we are able to offer intermediaries a choice of deals for those of their clients who have a 10% deposit.
“In addition we continue to support the shared equity sector by offering a 2-year fixed rate purchase mortgage for those clients who are using the government-backed FirstBuy scheme to secure their first home.”