calculation (n)
 /ˌkæl.kjʊˈleɪ.ʃən/

the process of using information you already have and adding, taking away, multiplying, or dividing numbers to judge the number or amount of something

refund (n)
/ˈriː.fʌnd/

the amount paid back

preparation (n)
/ˌprep.ərˈeɪ.ʃən/

the things that you do or the time that you spend preparing for something

penalty (n)
 /ˈpen.əl.ti/ 

a punishment for breaking a rule or law

owe (v)
/əʊ/

to have the responsibility to pay or give back something you have received from someone

joint (a)
/dʒɔɪnt/

involving two or more people, or done by them together

give up (phrasal verb)
/ɡɪv ʌp/

to stop doing something that you do regularly

fill out (phrasal verb)
/fɪl aʊt/

to add information such as your name or address in the empty spaces on an official document

file (v)
 /faɪl/

to enter into public record

deadline (n)
 /ˈded.laɪn/

a time by which something must be finished

withhold (v)
 /wɪðˈhəʊld/ 

to keep back something

tax incentive (n)
/tæks ɪnˈsen.t̬ɪv/

a reduction in taxes that encourages companies or people to do something that will help the country's economy

percent (n)
/pəˈsent/

one part of 100, or a particular amount of a total that you have divided by 100; percent is often shown using the symbol %

overdue (a)
/ˌoʊ·vərˈdu/

not paid, done, returned, etc. by the required or expected time

overpaid (a)
/ˌəʊvəˈpeɪd/

an overpaid amount of money is more than necessary

due date (n)
/duː deɪt/

the date or day that something is supposed to be paid, returned, completed, etc.

corporate income tax (n)
/ˈkɔr·pə·rət ˈɪn·kʌm tæks/

tax that a company has to pay on its profits

personal income tax (n)
/ˈpɜr·sə·nəl ˈɪn·kʌm /tæks/

a tax paid by people on the money they earn, as opposed to a tax that a company pays on its profits

value-added tax (n)
/ˈvæl·ju ˈæd·ɪd tæks/

a tax that is added to the price of goods and services

tax return (n)
/ˈtæks rɪˌtərn/

a document on which you report your income each year to calculate your taxes