Bydd unrhyw un sy'n prynu tŷ sy'n costio llai na £345,000 yn gweld gostyngiad yn y dreth y maen nhw'n ei thalu, hyd at uchafswm o £1,575.
Anyone buying a home costing less than £345,000 will see a reduction in the tax they pay, up to a maximum of £1,575.