calculation /ˌkælkjuˈleɪʃn/
(noun) the act or process of using numbers to find out an amount
Example: According to my calculations, I'll owe less money on my income taxes this year

deadline /ˈdedlaɪn/
(noun) a point in time by which something must be done
Example: The deadline for paying this years's taxes is just two weeks away

file /faɪl/
(noun) a box or folded piece of card for keeping loose papers together and in order
Example: To file a claim / complaint / petition / lawsuit (How to File a Lawsuit)

fill out
fill out /fɪl aʊt/
(phrasal verb) to become larger, rounder or fatter
Example: I usually ask someone to help me fill out my tax form

give up
give up /ɡɪv ʌp/
(phrasal verb) to stop trying to do something
Example: Ms. Gomez is so optimistic that she never gives up

joint /dʒɔɪnt/
(adjective) involving two or more people together
Example: We opened a joint bank account five years ago

owe /əʊ/
(verb) to have to pay somebody for something that you have already received or return money that you have borrowed
Example: As the business grew, the owner paid back loans and owed less money

penalty /ˈpenəlti/
(noun) a punishment for breaking a law, rule or contract
Example: To impose a penalty

preparation /ˌprepəˈreɪʃn/
(noun) the act or process of getting ready for something or making something ready
Example: Income tax preparation can take a long time

refund /ˈriːfʌnd/
(noun) a sum of money that is paid back to you, especially because you paid too much or because you returned goods to a shop
Example: With the tax refund, we bought two plane tickets

spouse /spaʊs/
(noun) a husband or wife
Example: My spouse prepares the tax return for both of us

withhold /wɪðˈhəʊld/
(verb) to refuse to give something to somebody
Example: Do not withhold any information from your accountant or he will not be able to prepare your tax form correctly

desire /dɪˈzaɪər/
(noun) a strong wish to have or do something
Example: We desire to have our own home