Many primary-residence sellers qualify for the federal capital gains exclusion, and Nevada has no state income tax, but tax treatment depends on your situation. Talk to a tax professional about your specific sale.
Request an official payoff quote from your loan servicer, since it includes interest through the closing date and any fees. The balance on your statement is usually slightly lower than the true payoff.
Pricing strategy, negotiating costs and choosing the right time to sell all matter. So does the financing on your next home: keeping more cash from the sale can change which loan program fits best.