Should I purchase the Turbo Tax 20 to file for approximately 4 individuals? What if all 20 efiles are not used can they be used next tax year?

Good morning

This is the Canadian site and I see you are a US resident

TurboTax.Intuit.com is what you are looking for

Answer Xchange is https://ttlc.intuit.com/turbotax

Thank you 

Leeanne@TurboTax Canada

TurboTax Standard allows you to file 8 returns over $25,000 and 12 more under $25,000.  It sounds as though Standard would be a better option.  I usually file 7 returns a year with that.