Income tax return and Official document

Income tax return noun - Document giving the tax collector information about the taxpayer's tax liability.

Official document and income tax return are semantically related. In some cases you can use "Official document" instead a noun phrase "Income tax return".

Official document noun - (law) a document that states some contractual relationship or grants some right.

Income tax return and official document are semantically related. Sometimes you can replace phrase "Income tax return" with "Official document", this phrases are similar.