This riddle is most likely talking about tax forms , especially the U.S. individual income tax return (Form 1040) , which is typically completed every April and is open to anyone who needs to file taxes, but contains many sections and lines to fill out.

Why this fits the clue

  • “I am completed every April”
    • In the United States and several other countries, the annual tax filing deadline is in April , traditionally April 15, when people complete and submit their income tax returns.
  • “Anyone can use me”
    • Standard tax forms like Form 1040 are publicly available and used by most individual taxpayers, regardless of occupation or background.
  • “Beware, there is a lot to fill out”
    • Tax returns often require:
      • Reporting income from multiple sources
      • Listing deductions and credits
      • Answering numerous eligibility questions
    • This makes them widely known as long, detailed, and sometimes confusing forms with many boxes and schedules to complete.

So the answer to the riddle “i am completed every april anyone can use me beware, there is a lot to fill out” is an income tax return form (like U.S. Form 1040).

Information gathered from public forums or data available on the internet and portrayed here.