Related Clues:

• Key on a keyboard
• Investor's hope
• Trip part
• Part of a round trip
• Retort
• Profit made on an investment
• Round-trip word
• Taxpayer's mail-in
• Investor's goal
• See 1 Across
• April 15 filing
• Tax form
• There and back
• Sequel-title word
• Such a ticket brings you back