租客每个月把钱交给银行。

1.你爸爸妈妈搬家了吗？- 在中国，是一个书面的约定书写习惯，第一放这个词爸爸，第二放表示妈妈的词。
2.租客每个月把钱交给银行。
把钱交给-把钱 I am still confused about this construction? any other examples?
3.为什么中国人不需要报税 （declare income and pay taxes) 一个人说“因为我们买东西的时候已经交了税了。”
交了税了- I am confused about this 了 construction
商品的价格包含税 - does China only have a consumption based tax (no income tax) ?

1.The similar construction of "把钱交给"：

把我的心交给你 give my heart to you

把工作做好 get the work down

把小孩照顾好 take care of the children

You can think 把 similar to "get" in English. You can use "get" in a lot of situations, and express different meannings. Maybe you need more practice to be proficent in using "把".

2.交了税了=交税了=交了税.

"了" means something has been done here. 

3.Jeff has answered you this question.

租客每个月把钱交给银行。

1.你爸爸妈妈搬家了吗？- 在中国，这是一个书面的约定。第一放爸爸这个词放第一爸爸，第二放妈妈放第二的词。
2.租客每个月把钱交给银行。
把钱交给-把钱 I am still confused about this construction? any other examples?

3.为什么中国人不需要报税 （declare income and pay taxes) 一个人说“因为我们买东西的时候已经交了税了。”
交了税了- I am confused about this 了 construction

“了” means that you have done something. for example ,我吃了晚饭了，means that you had dinner. sometimes ,you can use the character "过" instead . for example , “我吃了晚饭了”=“我吃过晚饭了” 

商品的价格包含税 - does China only have a consumption based tax (no income tax) ?

租客每个月把钱交给银行。

1.你爸爸妈妈搬 了家了吗？This is better.  Emphasizes more on "moving"- 在中国，是一个书面的约定，第一放这个词爸爸第二放妈妈的词。 Are you trying to say, "In Chinese, 'father' comes before 'mother'"?  If so, then it is, "中文 以父为先" This is because of Confucianism.  Male comes before female, senority comes before youngsters.  The only exception are these two vestigal terms, 陰陽 (Ying Yang) and 雌雄 (Female & Male) from the matriachal system China once was.  Another clue 姓 (last name, surname) "born from the woman"

2.租客每个月把钱交给银行。
把钱交给-把钱 I am still confused about this construction? any other examples?

把XXX is the Chinese equivalent of English's passive voice.  

Active voice: Give me the money => 給我錢, 

Passive voice: The money was given to me => 把錢给我

3.为什么中国人不需要报税 （declare income and pay taxes) 一个人说“因为我们买东西的时候已经交了税了。”
交了税了- I am confused about this 了 construction Chinese don't have tenses.  Instead they use time indicators.  了 is a past tense indicator.  Where it goes depends on what you are trying to emphasize. Also you usually don't need two of them together in a sentence because then the emphasis is negated.  Here it emphasizes the verb "to give".
商品的价格包含税 - does China only have a consumption based tax (no income tax) ?

http://en.wikipedia.org/wiki/Taxation_in_China