The calculator asked people to enter financial details, including their income, savings, benefits and expenditure, and no details were saved, bosses said.
De Sausmarez told BBC Guernsey that, if introduced, the General Sales Tax (GST) would be part of a package of measures, including reduction in income tax and social security contributions, pensions and other benefits going up.
She said: “Even after GST has been applied, the modelling shows a majority of households would be better off than they are now because of those other changes.”
P&R said it was exploring alternatives to the tax package and would present its recommendations “on what kind of tax reform would work best in Guernsey” in the summer.
