A bill that would make Oregonians shopping in Southwest Washington pay some retail sales tax is being considered by Washington lawmakers in an attempt to raise about $18 million in state revenue.If the proposal passes, out-of-state shoppers would pay the retail sales tax — 8.2 percent in Vancouver, for example. Later they could apply for a refund of the state’s portion of the tax, which is 6.5 percent. They would still have to pay the local sales tax, which in Vancouver totals 1.7 percent.To get a refund, shoppers would apply online through a process that proves their out-of-state residency. They would only apply once a year for their refunds and the refunds would have to total at least $25.The legislation, Senate Bill 6061, was proposed by Sen. Cheryl Pflug, R-Maple Valley. She said it is expected to raise state revenue by creating a minor inconvenience for shoppers and also by cutting down on tax fraud that sometimes occurs at stores. Now shoppers need only to show Oregon ID to receive a tax exemption.Pflug said her bill is similar to the rules in British Columbia, Canada. She said she hopes her legislation can help with the state’s $1.5 billion budget shortfall.