Some information on getting your financial affairs in order, while on JET and after
PAYING TAXES (OF YOUR HOME COUNTRY)
Taxes. Better than death, but usually more complicated.
Each country has different requirements concerning income earned overseas, so make sure to check with your tax authorities, fellow nationals on JET, and alumni in your home country to make sure you have fulfilled all filing requirements.
For Americans, the IRS is the place to start. Also, Kumamoto JETs have posted information here. Each state also has filing requirements, so check your state of residence if you lived a partial year there, especially before leaving for Japan.
For Great Britain, Inland Revenue is probably the place to check first.
For Australia, check with the ATO - things have changed in recent years and if you are not a permanent overseas resident, you will need to pay tax.
The most asked question for all JET leavers and the most confusing, and guaranteed to flood the various Facebook Groups to do with JET.
Please note that arrangements to receive a refund for your payments into the Japanese pension system should be begun before leaving Japan. AJET provides a very clear explanation of the steps that must be taken to do this, so please see their website here. JETAA Rocky Mountain also has a slightly different set of information available here.
If you would prefer to go to the bureaucratic horse's mouth, the Japan Pension Service has information available in several languages here.
Finally, of course, check with your local JETAA chapter to see if they provide information or can answer questions pertaining to your particular country and situation.